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®

POWR-GARD PRODUCTS CATALOG

POWR-GARD®
	PRODUCTS
	CATALOG

®
Indicating Fuses • Blocks & Holders • Relays & Controls • MOVs • Medium Voltage Fuses

Local Resources for a GLOBAL Market
Littelfuse products help protect
electrical equipment used in
construction, general industrial,
oil & gas, solar, mining, and OEM
applications. We offer a broad and
reliable selection of fuses, fuse blocks,
protection relays, and generator
controls to improve safety and
reduce downtime.

Trollhättan

Bellingham

Kaunas

Roskilde
Norwich
Swindon
Bremen

Saskatoon
Rapid City
Chicago
Champaign

Piedras Negras
Muzquiz

Lake Mills
Baldwinsville
Boston
Noida

Matamoros

Wuxi
Suzhou
Dongguan
Shenzhen

Seoul
Shanghai
Taipei

Yokohama

Hong Kong
Lipa City

For decades, we have helped OEMs, electrical
installers, design engineers and end-users select
the right product for their applications. Today,
Littelfuse offers a broader range of products
addressing protection, sensing, and control needs
while still providing the same great service and
support that customers have learned to expect.

Singapore

São Paulo

Littelfuse App!
Download our free
Littelfuse Catalogs
and Literature App to
keep our products and
technical resources at
your finger tips!

A Broad Portfolio of Circuit Protection
Products, Relays and Controls
Fuses & Holders

Relays & Controls

Technical & Safety Resources

UL Class Fuses
Medium Voltage Fuses
High-Speed Fuses
UL Class Fuse Blocks
Dead-Front Fuse Holders
Indicating Products
Power Distribution Blocks
OEM Custom Products

Ground-Fault Protection
Trailing Cable Protection
Resistance Grounding
Motor & Pump Protection
Arc-Flash Protection
Generator Controls
Engine Control & Diagnosis
Custom Products

Datasheets
White Papers
CAD Drawings
Electrical Curves
Training Videos
Technical Articles
High Power Test Lab
Technical Hotline

Table of Contents

1

Fuses

Miscellaneous Fuse Blocks & Holders...........................................116
Semiconductor Fuse Blocks........................................................... 120
Distribution & Splicer Blocks......................................................... 122
In-Line Fuse Holders....................................................................... 132

Class L Fuses...................................................................................... 8
Class RK1 Fuses................................................................................ 13
Class RK5 Fuses............................................................................... 16
Class K5 Fuses.................................................................................. 20
Class J Fuses.................................................................................... 21
Class T Fuses.................................................................................... 24
Class G Fuses.................................................................................... 26
Class CC / CD Fuses.......................................................................... 27
UL Supplemental / 10 x 38 Fuses...................................................... 30

7

LCP Fused Selective Coordination Panel....................................... 138
LPS Series POWR-Switch (Shunt Trip Disconnect)...................... 141

8

Glass / Electronic Fuses.................................................................... 33
Blade / Automotive Fuses................................................................. 36

Medium Voltage Fuses
Medium Voltage Fuses Overview.................................................... 39
R-Rated Medium Voltage Fuses......................................................40
E-Rated Medium Voltage Fuses...................................................... 42

4

Telecommunication Products
Telecommunications Power Fuses................................................... 50

5

Special Purpose Fuses
Solar Products Overview................................................................. 56
1500 Vdc Solar Rated Fuses............................................................ 57
1000 Vdc Solar Rated Fuses............................................................ 59
Forklift / Stud Mounted Fuses.......................................................... 62
Plug Fuses......................................................................................... 63
MEGA® Bolt-Down Fuses................................................................ 63
In-Line Fuses & Holders...................................................................64
Cable Limiters................................................................................... 65
Cylindrical Fuses............................................................................... 66
OEM Custom Products..................................................................... 67
L Series (Traditional) Semiconductor Fuses.................................... 69
LA Series (Alternate Dimension) Semiconductor Fuses................. 71
Square Body Semiconductor Fuses................................................. 77

6

9 Suppression Products
Industrial Varistor Products........................................................... 173
Surge Suppression Fuses............................................................... 175
BVSP Suppression Fuses............................................................... 176

10

LF Series Fuse Blocks Overview...................................................... 83
Class J Fuse Blocks.......................................................................... 85
Class H , K5 & R Fuse Blocks............................................................ 88
Class T Fuse Blocks..........................................................................94
Class G Fuse Blocks.......................................................................... 99
Class CC / CD & Midget Fuse Blocks.............................................. 101
LF Series Fuse Block Covers.......................................................... 105
Solar Rated Fuse Blocks................................................................. 106
Dead Front Fuse Holders................................................................ 109

© 2014 Littelfuse POWR-GARD® Products Catalog

Technical Application Guide
Fuseology Fundamentals................................................................ 183
Selection Considerations............................................................... 184
Time-current Curves & Peak Let-through Charts.......................... 189
Selective Coordination................................................................... 191
UL / CSA Fuse Classes & Applications........................................... 194
Terms & Definitions........................................................................ 196
Motor Protection Tables................................................................203
Alphanumeric Index of Catalog Numbers.....................................206
Condensed Fuse Cross Reference.................................................208

Fuse Blocks & Holders

1

3
4
5
6
7

Miscellaneous Accessories
Fuse Reducers................................................................................ 178
Box Cover Units.............................................................................. 179
Fuse Replacement & Custom Kit (FRCK Series)............................ 180
Fuse Display & Cabinet.................................................................. 181

11

2

Protection Relays & Controls
Relay & Control Products Overview.............................................. 143
Feature Comparisons..................................................................... 146
Ground-Fault Protection................................................................. 148
Trailing Cable Protection................................................................ 151
Resistance Grounding & NGR Monitoring.................................... 152
Motor Protection............................................................................ 154
Pump & Feeder Protection............................................................. 156
Arc-Flash Protection....................................................................... 157
Industrial GFCI (Shock-Block ™)...................................................... 157
Generator & Single-Function Protection....................................... 158
Generator Control........................................................................... 163
Engine Control & Diagnosis........................................................... 167
Alarm Monitoring........................................................................... 168
Custom-Engineered Electrical Equipment..................................... 170
Relay & Control Accessories......................................................... 171

2 Electronic Fuses & Automotive Blade

3

Pre-Engineered Solutions

1

littelfuse.com

8
9
10
11

UL FUSE CLASSES AND SELECTION CHART
UL CLASS

L

RK1

RK5

J
T

CC

LITTELFUSE
SERIES

OVERLOAD
CHARACTERISTICS

KLPC
KLLU
LDC
LLNRK
LLSRK_ID
LLSRK
KLNR

Time-Delay
Time-Delay
Fast-Acting
Time-Delay
Time-Delay
Time-Delay
Fast-Acting

KLSR

Fast-Acting

FLNR_ID
FLNR
FLSR_ID
FLSR
IDSR
JTD_ID
JTD
JLS
JLLN
JLLS

Time-Delay

Time-Delay
Time-Delay
Fast-Acting
Fast-Acting

200,000
200,000
200K / 300K*
100,000

170

0.5 - 60

10,000

Solar

–

1000

1 - 30

SPFJ

Solar

–

–

–

1000

70 - 450

SPFI
SPXV
SPXI

Solar
Solar
Solar

–
–
–

–
–
–

–
–
–

1000
1500
1500

2 - 20
6 - 30
2.5 - 3.5

250

1 - 600

20,000
20K (70 - 200A)
10K (250 - 400A)
20K (400A)
20,000
30,000
15,000
20K (1 - 60A)
50K (70 - 600A)

G

SLC

Time Lag

SPF

NLN

NLS

Fast-Acting

L15S

Midget
(Supplementary)

Plug
Telecom

20,000

0.1 - 30
0.1 - 30
35 - 60
0.2 - 20
25 - 60
–

Time-Delay

CD

Semiconductor

0.2 - 2
4.5 - 10
2.25 - 4
12 - 30
0.1 - 30
0.1 - 30
35 - 60

600
600
600
600
480
–

CCMR

Time-Delay
Fast-Acting
Time-Delay

K5

DC RATINGS
CURRENT INTERRUPTING
(AMPERES)
(AMPERES)
200 - 6000
20,000
601 - 4000
20,000
150 - 2000
50,000
0.1 - 600
0.1 - 600
0.1 - 600
20,000
1 - 600
1 - 30
35 - 600
35 - 600
0.1 - 600
0.1 - 600
20,000
0.1 - 600
0.1 - 600
0.8 - 100
20,000
110 - 600
–
–
1 - 60
70 - 1200
20,000
1 - 1200

250
250
300
500
300
300
250

KLDR
KLKR
CCMR

Solar

AC RATINGS
VOLTAGE CURRENT INTERRUPTING VOLTAGE
(VOLTS) (AMPERES)
(AMPERES)
(VOLTS)
600
200 - 6000
200K / 300K*
480
600
601 - 4000
200,000
300
600
150 - 2000
200,000
600
250
0.1 - 600
125
600
0.1 - 600
200K / 300K*
300
600
0.1 - 600
300
250
1 - 600
125
200,000
250
600
1 - 600
300
250
35 - 600
125
250
0.1 - 600
125
300
600
0.1 - 600
200K / 300K*
600
0.1 - 600
300
600
0.1 - 600
600
600
0.8 - 600
300
200K / 300K*
500
600
0.8 - 600
600
1 - 600
200,000
–
160
300
1 - 1200
125
200,000
600
1 - 1200
300

L25S
L50S
L60S
L70S

Very Fast-Acting

600

0.2 - 30

–

–

LFJ1000

61

Not Required
LPXV
Not Required

59
57
58

LFH25

20

LFH60

20

26

30

–

125
125
–
–

60

30

–
10,000
10,000
50,000
50,000
–
10,000
20,000
–
–

1000

LFC60060
LFG480 (1 - 20A)
LFG480 (25 - 60A)
LFPHV

–
–

Time-Delay
Medium Time-Delay

28
28
27

–

–
0.1 - 30
0.1 - 30
0.1 - 30
0.1 - 30
–
0.44
11
–
–
70 - 1200
1 - 600

Fast-Acting

27

–
–

FLU

24

–

–
125
300
500
600
–

SOO, TOO
SLO, TLO
L17T
TLN

L60030C • LFPSC •
LINK00_C •
571 • 572 •
LEC • LEY

24

–
–

Time-Delay
Time-Delay
Time-Delay
Fast-Acting
Fast-Acting
Time-Delay

LFT30 •
LSCR002 (700-800A)
LFT60 •
LSCR002 (700-800A)

–

10,000
10,000
10,000
100K / 200K*
100,000
10,000
10,000
20,000
10,000
10,000
–
–

Fast-Acting

FLA
FLM
FLQ
KLK
KLKD
KLQ

LFJ60 • LFPSJ

10,000

20K (1 - 60A)
50K (70 - 600A)

10,000

BLS

LFR60

10,000

50,000

1 - 800

Fast-Acting

LFR25

15
17
17
17
17
16
21
21
22

1-7
8 - 30
35 - 60
70 - 200
225 - 600
1 - 60
70 - 1000
1 - 200
225 - 800
10 - 800
–
10 - 800

250

Fast-Acting

LFR60

1 - 600

1 - 1000

BLF

LFR25
LFR60
LFR60
LFR25

250

150

BLN

–

FUSE SERIES
PAGE
NUMBERS
8
9
10
13
13
13
15

600
500
400
600
500
150
100
250
200
450
–
650

1 - 600

10 - 800
1 - 800
10 - 800
0.5 - 15
20 - 30
1 - 30
0.2 - 5
6 - 10
0.1 - 30
0.1 - 30
0.1 - 30
0.1 - 30
0.1 - 30
1-6
0.44
11
0.25 - 30
15 - 30
–
–

TLS

20,000

600

500
600
700
250
125
250
600
250
125
250
500
600
600
600

Fast-Acting

200K / 300K*

RECOMMENDED
FUSE BLOCKS AND
FUSE HOLDERS

200,000

1000
–
–
170

1 - 125

69
20,000

100,000

LSCR • 1LS
(except L70S)

L60030M • LFPSM •
LINK00_M •
571 • 572 •
LEB • LEX

69
69
69
69

31
31
30
30
30
30
31

LFPHV

31

Box Cover Units

63

LTFD Series
LFR25
LTFD101 •
LFT30060 (cartridge)

50
51
52

* Series are UL Listed with I.R. of 200,000A and Littelfuse ® self-certified with 300,000A I.R.

littelfuse.com

2

© 2014 Littelfuse POWR-GARD® Products Catalog

®

Littelfuse POWR-GARD –
Advanced Protection and
Facility Savings

TM

Increase safety with POWR-PRO® Fuses
Increase safety and reduce inventory
with MROplus

•	 Superior current-limitation from 1/10 – 6000 amperes
•	 Type 2 “No Damage” coordination with NEMA
and IEC motor circuits

Your detailed reports will include:
•	 A streamlined current-limiting fuse inventory
recommendation

•	 Blown fuse indication (LLSRK_ID and JTD_ID Series)
•	 Compact motor protection (JTD/JTD_ID, CCMR Series)

•	 A guide to reducing electrical hazards within your facility

•	 300,000 AIR to meet trends toward higher SCCR

•	 An annual cost savings estimate

Look for the POWR-PRO logo
for superior protection
®

UL FUSE CLASS

POWR-PRO ®

PAGE NUMBERS

Class L
Class RK1

KLPC & LDC
LLNRK/LLSRK_ID

8, 10
13

Class J

JTD/JTD_ID

21

Class CC / CD

CCMR (2/10–60)

27

© 2014 Littelfuse POWR-GARD® Products Catalog

•	 A detailed cross reference

All you need to do is e-mail an Excel file of your fuse inventory
to techline@littelfuse.com or to your local sales representative.
We will do the rest!

3

littelfuse.com

Developing Next Generation
1500 Vdc Products for High
And Low Current Ratings

POWR-GARD ® SOLAR RATED PRODUCTS
This catalog incorporates our line of products designed specifically for the growing solar industry. As global
standards are constantly changing, Littelfuse continues to develop circuit protection products that meet the
requirements of the evolving photovoltaic market.

1500 Vdc Solar Products

600-1000 Vdc Solar Products

SPXV Series Space-Saving Solar Fuse.................... 57

SPF Series 1000 Vdc 10x38mm Fuse....................... 60

SPXI Series In-Line Solar Fuse................................. 58

SPFJ Series 1000 Vdc Class J size Fuse.................... 61

LPXV Series 1500 Vdc Fuse Holder....................... 106

LFPHV 1000 Vdc Fuse Holder.................................. 109

New Products............................... littelfuse.com/solar

IDSR Series 600 Vdc Class RK5 Fuse........................ 16
KLKD Series 600 Vdc 10x38 Fuse............................. 30
SE-601 Ground-Fault Protection Relay.................... 148

Look for this logo to indicate products that are used in solar applications.
Visit our website littelfuse.com/solar for the latest updates on
approvals, certifications, and new products.

littelfuse.com

4

© 2014 Littelfuse POWR-GARD® Products Catalog

Littelfuse
Acquires
SymCom
Expanding our Line of Motor Protection Products
SymCom and SSAC manufacture robust products such as motor monitoring, protection and control
relays, electronic controls, timers and flashers. SymCom and SSAC products are used to control and
protect applications in the Industrial Pumping, Irrigation, Water and Waste Water, HVAC/R, Oil and Gas,
Food and Beverage, and Elevator markets.

SymCom has three key brands:

PROTECTION RELAYS & CONTROLS
SymCom and SSAC products include:
Enhanced
Overload Relays

Voltage/Phase
Monitors

Alternating
Relays

Protect motors and
pumps from over/
under current, over/
under voltage, phase
issues and ground
faults. Communication
modules also available.

A cost-effective means
to protect motors and
pumps from voltage
and phase issues.

Start and stop up to
four pumps or use as
a multi-channel switch.
Intrinsically safe
options available.

Pump
Controllers

Load Sensors

Balance runtime
between loads and can
be used in hazardous
locations.

Detect if the load is
running or if there is an
overload or underload
condition.

Timers &
Flashers
Delay starting
and stopping
loads, cycling, and
sequencing of motors,
pumps, compressors,
heaters, and lighting.

For more information visit SymCom.com, SSAC.com or Littelfuse.com/Electrical
© 2014 Littelfuse POWR-GARD® Products Catalog

5

littelfuse.com

Meet NEC Requirments
And Save Time With
Pre-Engineered Solutions
®

LCP Series Coordination Panel

LPS Series POWR-Switch

Ideal for circuits that require selective coordination
such as emergency lighting circuits or essential
electrical systems.

Individual fusible shunt trip disconnect switch easily
coordinates with system’s overcurrent protection.
Typical applications include elevator circuits.

Features/Benefits

Features/Benefits

•	 Meets NEC® requirements

•	 Pre-engineered single unit makes procurement easy

•	 Class CC & J fuse holders have open-circuit indication

•	 Reduces labor costs up to 66%

•	 Fast-acting fuses protect against short circuits

•	 Flexibility for a variety of applications

•	 Feed through/sub feed lugs and 84-circuit
configuration available

•	 Control power terminal block

•	 Ground and neutral bars

•	 Cu and AI wire rated

•	 UL Listed package

•	 Copper bus standard

littelfuse.com/LCP

•	 L
 ockable operating handle meets all code and
safety requirements

See page 141

littelfuse.com/LPS
See page 143

littelfuse.com

6

© 2014 Littelfuse POWR-GARD® Products Catalog

Section Overview
For over 85 years Littelfuse® has been providing fuses to the electrical
market. You can continue to count on our manufacturing and supply
chain processes to deliver high quality fuses when you need them.
At Littelfuse we leverage our global reach to stay on top of the latest
applications and standards. Whether your circuit protection needs are
focused on OEM, MRO, or construction, we are committed to being
your circuit protection partner and appreciate your business.

FUSES
Table of Contents
UL Class L Fuses...................................................... . . . 8
UL Class RK1 Fuses.................................................... . 13
UL Class RK5 Fuses................................................... . 16
UL Class J Fuses...................................................... . . 21
UL Class T Fuses...................................................... . . 24
UL Class G Fuses. .................................................... . .26
UL Class CC & CD Fuses. ............................................ . . 27
UL Supplementary Midget (10x38) Fuses. .......................... . 30

© 2014 Littelfuse POWR-GARD® Products Catalog

7

littelfuse.com

Fuses – UL Class L

KLPC SERIES POWR-PRO ® FUSES
		

600 Vac • Time-Delay • 200-6000 A

1
UL Class L Fuses

Ordering Information
200
250
300
350
400
450
SERIES
KLPC

500
600
601
650
700
750
AMPERAGE
800

AMPERE RATINGS
800
1350
900
1400
1000
1500
1100
1600
1200
1800
1300
1900

2000
2100
2200
2300
2400
2500

3000
3500
4000
4500
5000
6000

CATALOG NUMBER ORDERING NUMBER
KLPC800
KLPC800.X

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/klpc

Description

Dimensions

KLPC series POWR-PRO® fuses meet or exceed the most
stringent project specifications, including silver links, silver-plated
copper end bells, glass-reinforced melamine bodies, O-ring seals
between body and end bells, and granular quartz fillers.

Please refer to the Class L dimensions.............................. 12

Peak Let-Thru Curve

Applications
•	
•	
•	
•	

KLPC

Switchboard mains and feeders
Motor control center mains
Large motor branch circuits
Protection of power circuit breakers

Features/Benefits
•	
•	
•	
•	
•	

POWR-PRO® Performance
Best-in-class time-delay withstand
Current-Limiting
Easily coordinated with other system components
300 kA AC Interrupting Rating (self-certified)

Specifications
Voltage Ratings 	
	
Ampere Range	
Interrupting Ratings 	

	
Approvals	

	
Material	
Country of Origin 	

littelfuse.com

AC: 600 Vac or less
DC: 480 V
200 – 6000 A
AC: 200 kA rms symmetrical
300 kA rms symmetrical
(Littelfuse self-certified)
DC: 20,000 A
AC: Standard 248-10, Class L
UL Listed 601–6000 A (File: E81895)
UL Recognized 200–600 A (File: E71611)
CSA Certified 601–6000 A (File: LR29862)
Federal Specifications 700–6000 A
(QPL-W-F-1814)
DC: Littelfuse self-certified
Melamine body, Copper caps (silver plated)
Mexico

Note: For more information, see Peak Let-Thru Table on pg. 11

8

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class L

KLLU SERIES FUSES
600 Vac • Time-Delay • 601-4000 A

1

Ordering Information

SERIES
KLLU

750
800
900
AMPERAGE
601

AMPERE RATINGS
1000
1400
1200
1500
1350
1600

1800
2000
2500

3000
3500
4000

CATALOG NUMBER ORDERING NUMBER
KLLU601
KLLU601.X

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/kllu

Dimensions

Description

Please refer to the Class L dimensions.............................. 12

KLLU series fuses meet or exceed UL requirements for
UL Class L fuses. The KLLU series offers an economical
alternative to KLPC POWR-PRO® fuse with a slightly
higher peak let through current.

Peak Let-Thru Curve
KLLU

Applications
•	 Service switches
•	 Switchboard mains and feeders
•	 Motor control center mains
•	 Large motor branch circuits
•	 Circuit breaker protection

Features/Benefits
•	 Current-Limiting
•	 Easily coordinated with other system components
•	 200 kA AC Interrupting Rating

Specifications
Voltage Ratings 	
	
Ampere Range	
Interrupting Ratings	
	
Approvals	
	
	
	
Material	
Country of Origin 	

AC: 600 Vac or less
DC: 300 V
601–4000 A
AC: 200 kA rms symmetrical
DC: 20 kA rms symmetrical
Standard 248-10, Class L
UL Listed (File: E81895)
CSA Certified (File: LR29862)
DC: Littelfuse self-certified
Melamine body, Copper caps (silver plated)
Mexico

© 2014 Littelfuse POWR-GARD® Products Catalog

Note: For more information, see Peak Let-Thru Table on pg. 11

9

littelfuse.com

UL Class L Fuses

601
650
700

Fuses – UL Class L

LDC SERIES POWR-PRO ® FUSES
		

600 Vac/dc • Fast Acting • 150-2000 A

1
UL Class L Fuses

Ordering Information
150
200
250
300
350
400
SERIES
LDC

450
500
600
601
650
700
AMPERAGE
700

AMPERE RATINGS
750
800
900
1000
1100
1200

1201
1300
1350
1400
1500
1600

1601
1800
1900
2000

CATALOG NUMBER ORDERING NUMBER
LDC700
0LDC700.X

Web Resources
Download TC curves, CAD drawings and other technical
documents: littelfuse.com/ldc

Dimensions
Please refer to the Class L dimensions.............................. 12

Description

Peak Let-Thru Curve

High DC voltage and interrupting ratings make the
POWR-PRO® LDC ideal for DC applications. The DC
interrupting performance exceeds UL listing requirements.

LDC

Applications
•	 Solar inverter and array protection
•	 UPS protection especially for large battery circuits
•	 DC distribution and variable speed drives
•	 Mass transit systems

Features/Benefits
•	 POWR-PRO® Performance
•	 Extremely Current-Limiting
•	 600 Vac/dc rated
•	 200 kA AC Interrupting Rating
•	 50 kA DC Interrupting Rating

Specifications
Voltage Ratings 	
Ampere Range	
Interrupting Ratings	
	
Time Constant	
Approvals	
	
	
	
Material	
Country of Origin 	

littelfuse.com

600 Vac/dc or less
150–2000 A
AC: 200 kA rms symmetrical
DC: 5 0 kA
16 ms
Standard 248-10, Class L
UL Listed 601–2000 A (File: E81895)
UL Recognized 150–600 A (File: E71611)
CSA Certified (File: LR29862)
Melamine body, Copper caps (silver plated)
Mexico

Note: For more information, see Peak Let-Thru Table on pg. 11

10

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class L

CLASS L CURRENT-LIMITING EFFECTS
Current-Limiting Effects of KLPC (600 V) Fuses
SHORT CIRCUIT
CURRENT*

800 A
5,000
8,800
10,500
12,000
13,000
14,000
15,000
16,000
17,000
18,000
20,000
21,000
23,000
24,000

6000 A
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
70,000
75,000
87,000
95,000

Current-Limiting Effects of KLLU (600 V) Fuses
SHORT-CIRCUIT
CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

800 A
5,000
10,000
11,900
13,000
14,000
14,500
15,000
16,000
17,000
18,000
19,000
21,000
24,000
26,000

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
1200 A
1600 A
2000 A
3000 A
5,000
5,000
5,000
5,000
10,000
10,000
10,000
10,000
15,000
15,000
15,000
15,000
18,500
20,000
20,000
20,000
20,000
25,000
25,000
25,000
21,000
26,500
30,000
30,000
22,000
28,500
34,000
35,000
23,000
30,000
35,000
37,000
24,000
32,000
38,000
39,000
26,000
34,000
42,000
43,000
28,000
36,000
44,000
46,000
30,000
38,000
46,000
48,000
35,000
44,000
50,000
51,000
38,000
48,000
53,000
60,000

4000 A
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
44,000
50,000
54,500
57,500
68,000
74,000

Current-Limiting Effects of LDC (600 V) Fuses
SHORT CIRCUIT
CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

800 A
5,000
8,500
9,750
10,500
11,500
12,000
12,500
13,500
14,000
15,000
16,000
18,000
20,000
23,000

APPARENT RMS SYM­MET­R I­C AL CURRENT FOR VARIOUS FUSE RATINGS
1200 A
1600 A
5,000
5,000
10,000
10,000
14,000
15,000
15,000
19,000
16,000
21,000
17,000
22,000
18,000
23,000
19,000
24,000
21,000
26,000
22,000
28,000
24,000
30,000
25,000
33,000
30,000
38,000
32,000
41,000

2000 A
5,000
10,000
15,000
20,000
25,000
26,000
28,000
30,000
32,000
34,000
36,000
40,000
44,000
46,000

*Prospective RMS Sym­met­ri­c al Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves

© 2014 Littelfuse POWR-GARD® Products Catalog

11

littelfuse.com

UL Class L Fuses

5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

1

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
1200 A
1600 A
2000 A
3000 A
4000 A
5000 A
5,000
5,000
5,000
5,000
5,000
5,000
10,000
10,000
10,000
10,000
10,000
10,000
13,500
15,000
15,000
15,000
15,000
15,000
15,000
19,000
20,000
20,000
20,000
20,000
16,000
21,000
24,000
25,000
25,000
25,000
18,000
23,000
26,000
30,000
30,000
30,000
19,000
24,000
27,000
32,000
35,000
35,000
20,000
25,000
28,000
34,000
40,000
40,000
22,000
27,000
31,000
37,000
42,500
50,000
24,000
29,000
34,000
40,000
46,000
52,000
26,000
32,000
37,000
44,000
51,000
57,000
27,000
34,000
40,000
46,000
57,000
65,000
31,000
38,000
44,000
54,000
67,000
75,000
34,000
42,000
46,000
57,000
70,000
80,000

Fuses – UL Class L

CLASS L SERIES DIMENSIONS

UL Class L Fuses

1

Dimensions
FIG.
NO.

AMPERES
150-800

A
3 3 ⁄4
(95.3)
33 ⁄4
(95.3)
33 ⁄4
(95.3)
33 ⁄4
(95.3)
4
(101.6)
4
(101.6)
4
(101.6)
4
(101.6)
4
(101.6)

1

900-1200

2

1300-1600

2

1800-2000

2

2100-2500

3

2501-3000

3

3500-4000

4

4500-5000

5

6000

5

B
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)
53 ⁄4
(146.1)

C
63 ⁄4
(171.5)
63 ⁄4
(171.5)
63 ⁄4
(171.5)
63 ⁄4
(171.5)
63 ⁄4
(171.5)
63 ⁄4
(171.5)
63 ⁄4
(171.5)
—
—

D

E

­—

—

9 ⁄4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)
91⁄ 4
(235.0)

9 ⁄2
(241.3)
91⁄ 2
(241.3)
91⁄ 2
(241.3)
91⁄ 2
(241.3)
91⁄ 2
(241.3)
91⁄ 2
(241.3)

1

1

—
—

F
8 5⁄ 8
(219.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)
10 3 ⁄ 4
(273.1)

DIMENSIONS INCHES (mm)
G
H
J
K
2
21⁄ 2
—
—
(50.8)
(63.5)
2
21⁄ 2
—
—
(50.8)
(63.5)
3
23 ⁄8
—
—
(76.2)
(60.3)

F

13 ⁄ 4
(44.5)
13 ⁄ 4
(44.5)
31⁄ 4
(82.6)
31⁄ 4
(82.6)
31⁄ 4
(82.6)

23 ⁄4
(69.9)
31⁄ 2
(88.9)
4
(101.6)

31⁄ 2
(88.9)
5
(127.0)
5
(127.0)

43 ⁄ 4
(120.7)
51⁄ 4
(133.4)
51⁄ 4
(133.4)

53 ⁄4
(146.1)
71⁄ 8
(181.0)
71⁄ 8
(181.0)

5

(9.5)

⁄8

3

(9.5)
7

⁄16

(11.1)

⁄2

1

(12.7)
3

⁄4

(19.1)
3

⁄4

(19.1)
3

⁄4

(19.1)
1
(25.4)
1
(25.4)

J
H

J
H

D E F

C B A

N
M

FIG.2

(15.9) x (28.6)
5
⁄8 x 3 ⁄4
(15.9) x (19.1)
5
⁄8 x 3 ⁄4
(15.9) x (19.1)
5
⁄8 x 3 ⁄4
(15.9) x (19.1)
5
⁄8 x 3 ⁄4
(15.9) x (19.1)
5
⁄8 x 3 ⁄4
(15.9) x (19.1)
5
⁄8 x 13 ⁄8
(15.9) x (34.9)
5
⁄8 DIA.
(15.9)
5
⁄8 DIA.
(15.9)

FIG. 4

⁄8 x 11⁄8
(15.9) x (28.6)
5
⁄ 8 x 11⁄8
(15.9) x (28.6)
5
⁄8 x 11⁄8
(15.9) x (28.6)
5
⁄8 x 11⁄8
(15.9) x (28.6)
5
⁄8 x 11⁄8
(15.9) x (28.6)
5
⁄8 x 13 ⁄8
(15.9) x (34.9)
—
—

D E F

G

FIG. 3

A F

D B

K
G

—
5

H

D E F

FIG.1

N

⁄8 x 11⁄8

J

N
M

C B A

littelfuse.com

15⁄ 8
(41.3)
15⁄ 8
(41.3)
13 ⁄ 4
(44.5)
15⁄ 8
(41.3)
15⁄ 8
(41.3)

C B A

M

N
M

—

M

⁄8

J

J

C B A

—

L
3

G

L

M

FIG. 5
12

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class RK1

LLNRK / LLSRK / LLSRK_ID SERIES INDICATOR ® FUSES
		

250/600 Vac • Dual Element • Time-Delay • 1/10 -600 A

QPL

1

Ordering Information
1
1 1/8
1 1/4
1 4/10
1 6/10
1 8/10
2
2 1/4
2 1/2

AMPERE RATINGS
2 8/10
6 1/4
20
3
7
25
3 2/10
7 1/2*
30
3 1/2
8
35
4
9
40
4 1/2
10
45
5
12
50
5 6/10
15
60
6
17 1/2
70

75†
80
90
100
110
125
150
175
200

225
250
300
350
400
450
500
600

Note: All LLSRK_ID fuses rated 1 amp and above are Indicator® fuses.
*7.5 A is only available for the ID versions
†
75 A is only available for the 600 V

Description

RK1 fuses are extremely current-limiting fuses meaning they greatly
reduce or eliminate damage to circuits and equipment under shortcircuit conditions. Replacing existing Class H, K and RK5 fuses with
RK1 fuses is one of the easiest ways to immediately improve the
protection of plant workers and equipment.

SERIES

AMP

INDICATION

600
600
250

LLSRK_ID
LLSRK
LLNRK

60
60
80

•
–
–

CATALOG
NUMBER
LLSRK060ID
LLSRK060
LLNRK080

ORDERING
NUMBER
LSRK060.TXID
LSRK060.T
LNRK080.V

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/llsrk
littelfuse.com/llnrk

Applications
•	
•	
•	
•	

VOLTAGE

All general purpose circuits
Motors
Transformers
Safety upgrades

Recommended Fuse Blocks
LFR Series.......................................................................... 88

Features/Benefits

Dimensions

•	
•	
•	
•	
•	

Please refer to the Class R dimensions.............................. 19

POWR-PRO Performance
Indicator and Non-Indicator versions available
Dual-element design
Extremely Current-Limiting
IEC Type 2 “No Damage” protection to IEC and
NEMA type motor starters
•	 Indicating and DIN mount fuse holders available
®

Peak Let-Thru Curve (600 V)
LLSRK
1000000

Specifications
	
Ampere Range	
Interrupting Ratings	
	
Approvals	
	
Material	

100 A
60 A

10000

30 A

1000

200000

100

100000

13

200 A

10000

© 2014 Littelfuse POWR-GARD® Products Catalog

500 A
400 A

1000

Country of Origin 	

100000

100

	

AC: 6 00 Vac or less (LLSRK/LLSRK_ID)
250 Vac or less (LLNRK)
DC: 300 Vdc (LLSRK/LLSRK_ID)
125 Vdc (LLNRK)
1/10 – 600 A
AC: 200 kA rms symmetrical
300 kA rms symmetrical
(Littelfuse self-certified)
DC: 20 kA
AC: Standard 248-12, Class RK1
UL Listed (File: E81895)
CSA Certified (File: LR29862)
DC: Littelfuse self-certified
Federal Specification WF-1814
(QPL- W-F-1814)
LLNRK: 1 /10-30 A: Fiber body, Bronze cap
35-60 A: Composite body, Bronze cap (nickel plated)
70-600 A: Composite body, Copper cap
LLSRK: 1/10-60 A: Composite body, Bronze cap (nickel plated)
70-600 A: Composite body, Copper cap
Mexico

PEAK LET-THRU IN AMPERES

Voltage Ratings 	

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

Note: For more information, see Peak Let-Thru Table on pg. 14

littelfuse.com

UL Class RK1 Fuses

/
15/100
2/10
1/4
3/10
4/10
1/2
6/10
8/10
1 10

Fuses – UL Class RK1

CLASS RK1 CURRENT LIMITING EFFECTS

UL Class RK1 Fuses

1

Current-Limiting Effects of LLSRK and LLSRK_ID (600 V) Fuses
SHORT CIRCUIT
CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
30 A
1,060
1,350
1,600
1,700
1,900
2,000
2,100
2,200
2,400
2,500
2,700
2,900
3,200
3,300

60 A
1,600
2,000
2,300
2,600
2,800
3,000
3,100
3,300
3,500
3,800
4,000
4,200
4,600
4,700

100 A
2,100
2,800
3,200
3,600
3,800
4,100
4,400
4,600
4,900
5,200
5,700
6,200
7,300
8,000

200 A
2,600
3,400
3,900
4,500
4,800
5,200
5,700
6,000
6,500
7,000
7,750
8,500
10,000
11,000

400 A
4,100
5,250
6,000
6,700
7,500
8,000
8,500
9,000
9,500
10,000
11,000
12,000
14,000
16,000

600 A
—
8,000
9,000
10,000
11,000
12,000
12,500
13,000
14,000
15,000
17,000
18,000
21,000
23,000

Current-Limiting Effects of LLNRK (250 V) Fuses
SHORT CIRCUIT
CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
30 A
900
1,100
1,250
1,400
1,500
1,600
1,700
1,800
1,900
2,000
2,200
2,300
2,500
2,600

60 A
1,400
1,900
2,100
2,400
2,600
2,800
2,850
3,000
3,200
3,500
3,900
4,000
4,500
4,800

100 A
2,000
2,700
3,100
3,500
3,900
4,000
4,300
4,600
4,800
5,200
5,700
6,000
6,700
7,000

200 A
2,700
3,500
4,200
4,600
5,000
5,250
5,500
5,800
6,300
6,700
7,200
8,100
9,100
9,700

400 A
4,800
6,200
7,000
8,000
8,300
9,000
9,500
9,800
10,200
11,000
12,200
12,700
14,000
15,000

600 A
5,000
8,500
9,500
10,800
11,500
12,000
12,500
13,500
14,000
15,000
16,000
17,000
19,000
20,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves

LLSRK_ID Fuses—Quality Construction
for performance you can rely on…
Littelfuse LLSRK_ID Fuses feature true dual-element
construction. This robust design withstands
Blown Fuse Indicator Assembly
repeated surges within rated time delay
without opening needlessly, eliminating
downtime caused by power surges
or equipment demands.
Granular Quartz Filling

littelfuse.com

Plated End Caps

Precision Formed Short Circuit Element

Fiberglass Reinforced Pultruded Body
Elastomeric Silicone Overload Section

14

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class RK1

KLNR / KLSR SERIES FUSES
250/600 Vac • Fast-Acting • 1-600 A

1

Ordering Information
AMPERE RATINGS
40
45
50
60
70
80
90

10
12
15
20
25
30
35

VOLTAGE

SERIES

AMP

600
250

KLSR
KLNR

90
90

CATALOG
NUMBER
KLSR090
KLNR090

100
110
125
150
175
200
225

250
300
350
400
450
500
600
ORDERING
NUMBER
KLSR090.V
KLNR090.V

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/klsr
littelfuse.com/klnr

Description

Recommended Fuse Blocks

KLSR and KLNR series are en economical design providing
the safety of a RK1 fuse. The single element design
provides fast-acting overload and short-circuit protection.

Dimensions

LFR Series.......................................................................... 88
Please refer to the Class R dimensions.............................. 19

Use POWR-PRO® LLNRK and LLSRK series RK1, dualelement, time-delay fuses in all new applications requiring
the current-limiting ability of UL Class RK1 fuses or in
existing applications where fast-acting RK1 or RK5 fuses
have been opening on harmless system surges such as
motor starting currents.

Peak Let-Thru Curve (600 V)
KLSR

Applications
•	 Resistance heaters
•	 Lighting circuits
•	 Non-inductive loads

Features/Benefits
•	 Extremely Current-Limiting
•	 Indicating and DIN mount fuse blocks available

Specifications
Voltage Ratings 	
	
Ampere Range	
Interrupting Ratings	
	
Approvals	
	
Material	
	
	
Country of Origin 	

AC: 6 00 Vac or less (KLSR)
250 Vac or less (KLNR)
DC: 250 V (1 – 30 A KLSR);
300 V (35 – 600 A KLSR)
125 V (KLNR)
1 – 600 A
AC: 200 kA rms symmetrical
DC: 20 kA
AC: Standard 248-12, Class RK1
UL Listed (File: E81895)
CSA Certified (File: LR29862)
DC: Littelfuse self-certified
1-60 A: Composite body, Bronze cap (nickel plated)
70-100 A: Composite body, Copper caps
110-600 A: Melamine body, Copper caps
Mexico

© 2014 Littelfuse POWR-GARD® Products Catalog

15

littelfuse.com

05549002

UL Class RK1 Fuses

1
2
3
4
5
6
8

Fuses – UL Class RK5

IDSR SERIES INDICATOR ® POWR-PRO ® FUSES
		

600 Vac/dc • Dual Element • Time-Delay • 1/10 -600 A

1
UL Class RK5 Fuses

Ordering Information
/
1/8
15/100
2/10
1/4
3/10
4/10
1/2

/
8/10
1
1 1/8
1 1/4
1 4/10
1 1/2
1 6/10

1 8/10
2
2 1/4
2 1/2
2 8/10
3
3 2/10
3 1/2

6 10

1 10

AMPERE RATINGS
4
8
4 1/2
9
5
10
5 6/10
12
6
15
6 1/4
17 1/2
7
20
7 1/2
25

30
35
40
45
50
60
70
75

80
90
100
110
125
150
175
200

225
250
300
350
400
450
500
600

Note: All fuses rated 1A and above are Indicator® fuses.

VOLTAGE

SERIES

AMP

CATALOG
NUMBER

ORDERING
NUMBER

600

IDSR

30

IDSR030

IDSR030.T

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/idsr

Description
The IDSR combines 600 Vdc capability with indication to
provide an ideal solution for many DC applications.

Recommended Fuse Blocks
LFR Series.......................................................................... 88

Applications
•	
•	
•	
•	
•	
•	

Dimensions

DC circuits
Solar inverters
Motors
Transformers
Solenoids
Fluorescent lighting

Please refer to the Class R dimensions.............................. 19

Peak Let-Thru Curve
IDSR

Features/Benefits

1000000

•	 POWR-PRO® Performance
•	 Current limiting
•	 Indication
100000

PEAK LET-THRU IN AMPERES

Specifications
Voltage Ratings 	AC: 600 Vac or less
DC: 600 Vdc or less
1/10 – 600 A
Ampere Range	
Interrupting Ratings	
AC: 200 kA rms symmetrical
300 kA rms symmetrical
(Littelfuse self-certified)
	
DC: 20 kA
Approvals	Standard 248-12, Class RK5
UL Listed (File: E81895)
CSA Certified (File: LR29862)
Material	
1/10-60 A: Composite body, Bronze caps
	
70-600 A: Composite body, Copper caps
Country of Origin 	
Mexico

600 A
400 A
200 A
100 A
60 A

10000

30 A
15 A

1000

2000000

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

100000

10000

1000

100

100

Note: For more information, see Peak Let-Thru Table on pg. 18

littelfuse.com

16

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class RK5

FLNR_ID / FLSR_ID SERIES INDICATOR ® FUSES
QPL

250/600 Vac • Dual Element • Time Delay • 1/10 -600 A

1

Ordering Information
/
8/10
1
1 1/8
1 1/4
1 4/10
1 1/2
1 6/10

1 8/10
2
2 1/4
2 1/2
2 8/10
3
3 2/10
3 1/2

6 10

AMPERE RATINGS
4
8
4 1/2
9
5
10
5 6/10
12
6
15
6 1/4
17 1/2
7
20
7 1/2
25

30
35
40
45
50
60
70
75**

80
90
100
110
125
150
175
200

225
250
300
350
400
450
500
600

Note: For 1/10 – 30A 250 volt fuses, order non-indicating FLNR series fuses.
*FLNR only. †FLNR, FLSR, FLSR_ID only. *
*FLNR, FLSR, FLSR_ID only

Description
Available in both Indicating and Non-Indicating versions,
the FLNR/FLSR series of fuses set the standard for general
purpose fuses. The dual-element design provides advanced
short circuit and overload protection. FLSR series fuses
provide excellent protection for all types of circuits especially
those containing motors.

VOLTAGE

INDICATION

SERIES

AMP

600 V
600 V
250 V
250 V

–
•
–
•

FLSR
FLSR_ID
FLNR
FLNR_ID

15
15
60
60

CATALOG
NUMBER
FLSR015
FLSR015ID
FLNR060
FLNR060ID

ORDERING
NUMBER
FLSR015.T
FLSR015.TXID
FLNR060.T
FLNR060.TXID

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/flsr
littelfuse.com/flnr

Applications

Recommended Fuse Blocks

•	
•	
•	
•	

Dimensions

LFR Series.......................................................................... 88

Service entrance switches
Switchboard mains and feeders
Motor control central mains and motor branch circuits
All general purpose circuits

Please refer to the Class R dimensions.............................. 19
Refer to FLNR dim. for FLNR_ID and the FLSR dim. for FLSR_ID.

Features/Benefits

Peak Let-Thru Curve (600 V)

•	 Indicator and Non-Indicator versions available
•	 Dual-element design
•	 Current limiting

FLSR_ID

Specifications
Voltage Ratings 	
	

Ampere Range	
Interrupting Ratings	

	
Approvals	
	
	
	
	
Material	
	
Country of Origin 	

AC: 6 00 Vac or less (FLSR_ID)
250 Vac or less (FLNR_ID)
DC: 300 V (FLSR_ID)
125 V (FLNR 1/10 – 30 A);
125 V (FLNR_ID 35 – 600 A)
1/10 – 600 A
AC: 200 kA rms symmetrical
300 kA rms symmetrical
(Littelfuse self-certified)
DC: 20 kA
Standard 248-12, Class RK5
UL Listed (File: E81895)
CSA Certified (File: LR29862)
Federal Specification WF-1814
(QPL- W-F-1814)
FLSR: 1/10-60 A: Composite body, Bronze caps
70-600 A: Composite body, Copper caps
FLNR: 1/10-60 A: Fiber body, Bronze caps
70-600 A: Composite body, Copper caps
Mexico

© 2014 Littelfuse POWR-GARD® Products Catalog

Note: For more information, see Peak Let-Thru Table on pg. 18

17

littelfuse.com

UL Class RK5 Fuses

/
1/8*
15/100
2/10
1/4
3/10†
4/10
1/2
1 10

Fuses – UL Class RK5

CLASS RK5 CURRENT-LIMITING EFFECTS

UL Class RK5 Fuses

1

Current-Limiting Effects of IDSR (600 V) Fuses
SHORT CIRCUIT CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
15 A
800
1,100
1,300
1,400
1,500
1,600
1,700
1,800
1,900
2,000
2,200
2,300
2,600
2,800

30 A
1,100
1,600
1,900
2,200
2,500
2,700
2,900
3,100
3,400
3,600
4,000
4,200
4,500
4,600

60 A
2,100
2,900
3,400
3,800
4,100
4,500
4,700
5,000
5,400
5,800
6,300
6,800
7,700
8,400

100 A
3,200
4,300
5,000
5,600
6,100
6,500
6,800
7,200
7,800
8,300
9,100
9,800
11,200
12,400

200 A
5,000
7,300
8,600
9,500
10,300
11,000
11,600
12,100
13,100
13,900
15,400
16,700
19,300
21,400

400 A
5,000
10,000
13,700
15,500
16,700
17,700
18,600
19,400
20,800
22,000
24,000
25,500
28,100
30,000

600 A
5,000
10,000
15,000
19,000
21,500
23,500
25,200
26,600
29,500
30,600
33,200
35,100
38,000
39,600

Current-Limiting Effects of FLSR and FLSR_ID (600 V) Fuses
SHORT-CIRCUIT CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

30 A
1,250
1,600
1,800
2,250
2,450
2,700
2,900
3,000
3,400
3,600
3,900
4,300
4,500
4,600

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
60 A
100 A
200 A
400 A
2,100
3,200
5,000
5,000
2,850
4,300
7,250
10,000
3,400
5,000
8,500
13,500
3,800
5,500
9,500
15,750
4,100
5,700
10,250
17,000
4,500
6,400
10,750
18,000
4,800
6,700
11,500
19,000
5,000
7,250
12,000
19,500
5,250
7,750
13,000
21,000
5,750
8,100
14,000
22,000
6,250
9,000
15,000
24,000
6,750
9,750
16,500
26,000
7,600
11,100
19,000
28,000
8,400
12,250
21,500
30,000

600 A
5,000
10,000
15,000
19,000
21,000
23,000
24,250
27,000
29,000
30,500
33,000
35,000
38,000
40,000

Current-Limiting Effects of FLNR and FLNR_ID (250V) Fuses
SHORT-CIRCUIT CURRENT*
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

30 A
1,400
1,550
2,000
2,250
2,400
2,550
2,650
2,800
3,000
3,200
3,400
3,850
4,100
4,300

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
60 A
100 A
200 A
400 A
2,100
3,100
5,000
5,000
2,500
3,900
6,500
9,500
3,150
4,400
7,250
10,500
3,400
5,000
8,250
12,000
3,750
5,250
9,000
12,500
4,100
5,600
9,500
13,500
4,300
5,800
9,750
14,000
4,400
6,250
10,250
15,000
5,000
6,500
10,500
16,000
5,250
7,000
11,500
17,000
5,750
7,500
12,500
19,000
6,000
8,000
13,500
21,000
7,000
9,000
15,200
24,000
7,500
9,750
16,500
26,000

600 A
5,000
10,000
14,000
16,000
16,500
18,000
19,000
20,000
21,000
23,000
25,500
27,500
31,500
34,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves

littelfuse.com

18

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class R

CLASS R SERIES DIMENSIONS
1

Dimensions
A

G

A

J
B

D

E

/ –30

1 10

35 – 60

70 – 100

110 – 200

225 – 400

450 – 600

FIGURE
NUMBER

1

1

2

2

2

2

D

K

C

SERIES

F

B

H

FIG. 1
AMPS

E

C

UL Class R Fuses

F

70-600A

FIG. 2
DIMENSIONS INCHES (mm)

A

B

LLNRK
KLNR
FLNR

2 (50.8)

1

LLSRK
KLSR
FLSR
IDSR

5 (127.0)

LLNRK
KLNR
FLNR

3 (76.2)

LLSRK
KLSR
FLSR
IDSR

C
⁄2 (12.7)

9

1

3

⁄4 (19.1)

5

⁄8 (15.9)

3

⁄4 (19.1)

5

51⁄ 2 (139.7)

1 (25.4)

5

LLNRK
KLNR
FLNR

57⁄ 8 (149.2)

LLSRK
KLSR
FLSR
IDSR

E

F

G

H

J

K

⁄8 (9.5)

­—

­—

­—

⁄8 (15.9)

­—

­—

­—

⁄8 (15.9)

­—

­—

­—

⁄8 (22.2)

­—

­—

­—

⁄16 (14.3)

5

⁄64 (2.0)

5

⁄32 (4.0)

13

⁄16 (20.6)

3

⁄32 (2.4)

3

⁄16 (4.8)

5

⁄8 (15.9)

13

⁄16 (20.6)

3

⁄32 (2.4)

3

⁄16 (4.8)

5

⁄8 (15.9)

11 ⁄ 16 (27.0)

3

⁄32 (2.4)

1

⁄4 (6.4)

7

1 (25.4)

11 ⁄ 16 (27.0)

11 ⁄ 16 (27.0)

1

⁄8 (3.2)

3

⁄4 (19.1)

—

1

⁄4 (6.4)

9

⁄32 (7.1)

1

77⁄ 8 (200.0)

11 ⁄ 4 (31.8)

11 ⁄ 16 (27.0)

15 ⁄ 16 (33.3)

1

⁄8 (3.2)

3

⁄4 (19.1)

—

1

⁄4 (6.4)

9

⁄32 (7.1)

1

LLNRK
KLNR
FLNR

71 ⁄ 8 (181.0)

11⁄ 2 (38.1)

115 ⁄ 32 (37.3) 119 ⁄ 32 (40.5)

3

⁄16 (4.8)

11⁄ 8 (28.6)

—

7

⁄16 (11.1)

9

⁄32 (7.1)

11

⁄16 (17.5)

LLSRK
KLSR
FLSR
IDSR

9 5 ⁄ 8 (244.5)

13 ⁄ 4 (44.5)

115 ⁄ 32 (37.3) 127⁄ 32 (46.8)

3

⁄16 (4.8)

11⁄ 8 (28.6)

—

7

⁄16 (11.1)

9

⁄32 (7.1)

11

⁄16 (17.5)

LLNRK
KLNR
FLNR

8 5 ⁄ 8 (219.1)

2 (50.8)

115 ⁄ 16 (49.2) 2 3 ⁄ 32 (53.2)

1

⁄4 (6.4)

15 ⁄ 8 (41.3)

—

5

⁄8 (15.9)

13

⁄32 (10.3)

15

⁄16 (23.8)

LLSRK
KLSR
FLSR
IDSR

115 ⁄ 8 (295.3) 2 1⁄ 2 (63.5)

2 (50.8)

219 ⁄ 32 (65.9)

1

⁄4 (6.4)

15 ⁄ 8 (41.3)

—

5

⁄8 (15.9)

13

⁄32 (10.3)

15

⁄16 (23.8)

LLNRK
KLNR
FLNR

10 3 ⁄ 8 (263.5) 2 1⁄ 2 (63.5)

2 3 ⁄ 8 (60.3)

219 ⁄ 32 (65.9)

1

⁄4 (6.4)

2 (50.8)

—

3

⁄4 (19.1)

17

⁄32 (13.5)

11⁄ 8 (28.6)

LLSRK
KLSR
FLSR
IDSR

13 3 ⁄ 8 (339.7)

213 ⁄ 32 (61.1) 3 3 ⁄ 32 (78.6)

1

⁄4 (6.4)

2 (50.8)

—

3

⁄4 (19.1)

17

⁄32 (13.5)

11⁄ 8 (28.6)

© 2014 Littelfuse POWR-GARD® Products Catalog

⁄2 (12.7)

D

3 (76.2)

19

3

⁄2 (12.7)

⁄2 (12.7)

littelfuse.com

Fuses – UL Class K5

NLN / NLS SERIES (ONE-TIME) FUSES
250/600 Vac • “One-Time” • 1-600 A

1

Specifications

UL Class K5 Fuses

Voltage Ratings 	

AC: 6 00 Vac or less (NLS)
250 Vac or less (NLN)
DC: 4 00 V (NLS 35 – 60 A)
500 V (NLS 8 – 30 A) (NLS 225 – 600 A)
600 V (NLS 1 – 7 A) (NLS 70 – 200 A)
250 V (NLN))
1 – 600 A
AC: 50 kA rms symmetrical
DC: 20 kA (1 – 60 A)
50 kA (70 – 600 A)
Standard 248-9, Class K5
UL Listed (File: E81895)
CSA Certified (File: LR29862)
NLS: 1 -15 A: Fiber body, Bronze cap
20-60 A: Composite body, Bronze cap
70-600 A: Fiber body, Copper cap (tin plated)
NLN: 1-30 A: Ceramic body
35-60 A: Fiber body, Bronze cap
70-600 A: Fiber body, Copper cap (tin plated)
Mexico

	

Ampere Range	
Interrupting Ratings	
	
Approvals	
	
	
Material	
	

Description

Country of Origin 	

NLN and NLS fuses provide low cost protection for general
purpose feeder and branch circuits when available short
circuit currents are less than 50 kA.

Ordering Information

Note: Canadian Electrical Code NLKP Type P fuse available. Visit littelfuse.com/nlkp

1
2
3
4
5
6

Applications
General purpose residential and commercial circuits with
little or no motor load.

Features/Benefits
•	 Economical
•	 50 kA interrupting rating
•	 Indicating and DIN mount holders available

VOLTAGE SERIES
600
NLS
250
NLN

Download TC Curves, CAD drawings and other technical
information: littelfuse.com/nln
littelfuse.com/nls

A

D

1 – 30

1

35 – 60

1

70 – 100

2

110 – 200

2

225 – 400

2

450 – 600

2

littelfuse.com

CATALOG NUMBER ORDERING NUMBER
NLS020
0NLS020.T
NLN015
0NLN015.T

E

C
F

B

FIG. 1

REFER TO
FIG. NO.

AMP
20
15

LFH Series.......................................................................... 88

B

AMPERES

300
350
400
450
500
600

Recommended Fuse Blocks

Dimensions
C

125
150
175
200
225
250

*NLKP series available only in those amperages preceded by an asterisk.

Web Resources

A

AMPERE RATINGS
*25
*60
*30
70
*35
80
*40
90
*45
100
*50
110

7
8
10
12
*15
*20

D

G

FIG. 2

SERIES
NLN
NLS
NLN
NLS
NLN
NLS
NLN
NLS
NLN
NLS
NLN
NLS

A
2 (50.8)
5 (127.0)
3 (76.2)
5 1⁄2 (139.7)
5 7⁄8 (149.2)
7 7⁄8 (200.0)
7 1 ⁄8 (181.0)
9 5 ⁄8 (244.5)
8 5 ⁄8 (219.1)
11 5 ⁄ 8 (295.3)
10 3 ⁄8 (263.5)
13 3 ⁄8 (339.7)

B
12
⁄ (12.7)
3 4
⁄ (19.1)
3 4
⁄ (19.1)
1 (25.4)
1 (25.4)
11 ⁄4 (31.8)
11⁄2 (38.1)
1 3 ⁄4 (44.5)
2 (50.8)
2 1⁄2 (63.5)
2 1⁄2 (63.5)
3 (76.2)

DIMENSIONS INCHES (mm)
C
D
E
12
9 16
⁄ (12.7)
⁄ (14.3)
—
5 8
13 16
⁄ (15.9)
⁄ (20.6)
—
5 8
13 16
⁄ (15.9)
⁄ (20.6)
—
5 8
⁄ (15.9)
11 ⁄16 (27.0)
—
1 8
1 (25.4)
11 ⁄16 (27.0)
⁄ (3.2)
1 8
1 (25.4)
15 ⁄16 (33.3)
⁄ (3.2)
3 16
13 ⁄8 (34.9)
19 ⁄ 16 (39.7)
⁄ (4.8)
3 16
13 ⁄8 (34.9)
127⁄32 (46.8)
⁄ (4.8)
14
17⁄8 (47.6)
23 ⁄32 (53.2)
⁄ (6.4)
14
17⁄8 (47.6)
219 ⁄32 (65.9)
⁄ (6.4)
14
2 1⁄4 (57.2)
219 ⁄32 (65.9)
⁄ (6.4)
14
2 1⁄4 (57.2)
33 ⁄32 (78.6)
⁄ (6.4)

20

F
—
—
—
—
3 4
⁄ (19.1)
3 4
⁄ (19.1)
11 ⁄8 (28.6)
11 ⁄8 (28.6)
15 ⁄8 (41.3)
15 ⁄8 (41.3)
2 (50.8)
2 (50.8)

G
—
—
—
—
15 ⁄16 (33.3)
19 ⁄16 (39.7)
1 7⁄8 (47.6)
23 ⁄32 (53.2)
213 ⁄32 (61.1)
2 7⁄8 (73.0)
2 7⁄8 (73.0)
37⁄ 16 (87.3)

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class J

JTD_ID SERIES INDICATOR® POWR-PRO® FUSES
	

600 Vac  •  Time Delay  •  8 /10 -600 A

1

Ordering Information
AMPERE RATINGS

2
2 1⁄4
2 1⁄2
2 8 ⁄10
3
3 2 ⁄10

3 1⁄2
4
4 1⁄2
5
5 6 ⁄10
6

VOLTAGE

SERIES

600
600

JTD_ID
JTD

7
8
9
10
12
15

17 1⁄2
20
25
30
35
40

45
50
60
70
80
90

AMP INDICATION
60
60

•
–

100
110
125
150
175
200

225
250
300
350
400
450

CATALOG
NUMBER
JTD60ID
JTD060

500
600

ORDERING
NUMBER
0JTD060.TXID
0JTD060.T

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/jtd

Recommended Fuse Holders

Description

LFJ60 Series....................................................................... 85
LFPSJ Series (8 ⁄10 –60 A)........................................................111

The Littelfuse POWR-PRO® JTD Class J fuse is available with
visual blown fuse indication or in standdard non-indicating
versions. The current-limiting time delay JTD_ID offers a
patented design which reduces nuisance fuse openings.

Dimensions

Features/Benefits

Please refer to the Class J dimensions.............................. 23

•	
•	
•	
•	

Peak Let-Thru Curve

POWR-PRO® Performance
Current-Limiting
IEC Type 2 Protection
Indication and non-indication versions available

JTD_ID
1000000

Applications
Fused combination motor controllers and control centers
Transformer protection
Protection for series rated molded case circuit-breaker panels
General purpose circuits

Specifications
Voltage Ratings 	
	

Ampere Range	
Interrupting Rating	
	

Material	
	
Approvals 	
	
Material	
	
	
Country of Origin 	

AC: 600 Vac or less
DC: 300 V (8 ⁄10 –100 A)
500 V (110–600 A)
8
⁄10 –600 A
AC: 200 kA rms symmetrical
300 kA rms symmetrical
DC: 20 kA
Body: Melamine
Caps: Nickel-plated Bronze (8 ⁄10 –60 A)
Brass (70–200 A)
	Brass Cap & Copper Blade (225–600 A)
AC: S tandard 248-8, Class J
UL Listed (File: E81895)
CSA Certified (File: LR29862)
DC: Littelfuse self-certified
8/10-60 A: Melamine body, Bronze cap (nickel plated)
70-200 A: Melamine body, Brass cap
225-600 A: Melamine body, Copper cap
Mexico

© 2014 Littelfuse POWR-GARD® Products Catalog

21

100000

PEAK LET-THRU IN AMPERES

•	
•	
•	
•	

600 A
400 A
200 A
100 A
60 A

10000

30 A
15 A
12 A

5.6 A

1000

100
100

1000

10000

100000 200000

AVAILABLE FAULT
SYMMETRICAL R.M.S. AMPERES

Note: For more information, see Peak Let-Thru Table on pg. 23

littelfuse.com

UL Class J Fuses

⁄10
1
1 1⁄4
1 1⁄2
16 ⁄10
1 8 ⁄10
8

Fuses – UL Class J

JLS SERIES FUSES
QPL

600 Vac • Fast-Acting • 1-600 A

1

Ordering Information

UL Class J Fuses

AMPERE RATINGS

1
3
6
10
15

20
25
30
35
40

45
50
60
70
80

90
100
110
125
150

VOLTAGE

SERIES

AMP

600

JLS

110

CATALOG
NUMBER
JLS110

175
200
225
250
300

350
400
450
500
600
ORDERING
NUMBER
0JLS110.X

Web Resources
Download TC curves, CAD drawings and other technical
information: littelfuse.com/jls

Recommended Fuse Holders
LFJ60 Series....................................................................... 85
LFPSJ Series (8 ⁄10 –60 A)........................................................111

Peak Let-Thru Curve

Description
JLS series fuses provide space saving, fast-acting overload
and short-circuit protection for non-inductive loads.
For ap­pli­ca­tions where short-duration surg­es and spikes may
cause nuisance fuse opening, consider the use of Littelfuse
POWR-PRO® JTD or JTD_ID series time-delay fuses.

JLS
1000000

Applications
•	 General purpose circuits with little or no motor load.
•	 Resistive loads, such as resistance electric heat.
•	 Loads requiring fast-acting overload protection, such as
equipment containing solid-state devices.

100000

PEAK LET-THRU IN AMPERES

600 A

Specifications
Voltage Ratings	
600 Vac or less
Ampere Range	
1–600 A
Interrupting Ratings	
200 kA rms symmetrical
Approvals	
Standard 248-8, Class J
	
UL Listed (File: E81895)
	
CSA Certified (File: LR29862)
	
Federal Specification WF-1814
	(QPL-W-F-1814)
Material	
1-60 A: Melamine body,
Bronze cap (nickel plated)
	
70-400 A: Melamine body
Brass cap
	
450-600 A: Melamine body
Copper cap
Country of Origin 	
Mexico

400 A
200 A
100 A
60 A

10000

30 A

1000

200000

100000

10000

1000

100

100

AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES

Dimensions
Please refer to the Class J dimensions.............................. 23

littelfuse.com

22

05567005

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class J

CLASS J DIMENSIONS AND CURRENT-LIMITING EFFECTS
1

Dimensions Inches (mm)

G

D

F

A
B
C
D

A

E

H

Fig. 2

Fig. 1

Dimensions of JTD_ID, JTD and JLS
DIMENSIONS INCHES (mm)

AMPERES

FIGURE
NUMBER

A

B

C

D

E

F

G

H

1 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600

1
1
2
2
2
2

2 1⁄ 4 (57.2)
2 3 ⁄8 (60.3)
2 5 ⁄8 (66.7)
3 (76.2)
3 3 ⁄8 (85.7)
3 3 ⁄ 4 (95.3)

—
—
3 17⁄32 (89.7)
49 ⁄32 (108.7)
51⁄8 (130.2)
527⁄32 (148.4)

⁄ (12.7)
5 8
⁄ (15.9)
3 23 ⁄32 (94.5)
415 ⁄32 (113.5)
5 3 ⁄8 (136.5)
6 5 ⁄ 32 (156.4)

⁄ (20.6)
11 ⁄16 (27.0)
4 5 ⁄8 (117.5)
5 3 ⁄4 (146.1)
7 1⁄8 (181.0)
8 (203.2)

—
—
11⁄8 (28.6)*
11⁄2 (38.1)
2 (50.8)
2 1⁄ 2 (63.5)

—
—
3 4
⁄ (19.1)
11⁄8 (28.6)
15 ⁄8 (41.3)
2 (50.8)

—
—
9 32
⁄ (7.1)
9 32
⁄ (7.1)
13 32
⁄ (10.3)
17 32
⁄ (13.5)

—
—
18
⁄ (3.2)
3 16
⁄ (4.8)
1 4
⁄ (6.4)
3 8
⁄ (9.5)

12

13 16

*70-100 A JLS dimension = 1 (25.4)

Current-Limiting Effects of JTD_ID (600 V) Fuses
SHORT CIRCUIT
CURRENT †
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

APPARENT RMS SYM­MET­RI­C AL CURRENT FOR VARIOUS FUSE RATINGS
15 A
565
675
775
825
900
950
1,000
1,050
1,100
1,200
1,300
1,375
1,500
1,600

30 A
750
925
1,050
1,125
1,200
1,300
1,350
1,400
1,500
1,600
1,700
1,800
2,000
2,175

60 A
1,500
1,900
2,100
2,300
2,500
2,600
2,700
2,800
3,000
3,200
3,400
3,600
3,950
4,000

100 A
1,800
2,450
2,800
3,000
3,300
3,500
3,700
3,900
4,200
4,500
4,900
5,200
6,000
6,500

200 A
2,800
3,600
4,100
4,400
5,000
5,100
5,400
5,600
6,000
6,400
7,200
7,800
9,000
10,000

400 A
4,800
5,700
6,500
7,250
8,000
8,400
9,000
9,200
10,000
10,500
11,200
12,200
14,500
16,000

600 A
5,000
7,750
9,000
9,700
10,500
11,000
12,000
12,500
13,000
14,000
15,500
16,500
19,000
20,500

†Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves

© 2014 Littelfuse POWR-GARD® Products Catalog

23

littelfuse.com

UL Class J Fuses

C

Fuses – UL Class T

JLLN / JLLS SERIES FUSES
300/600 Vac • Fast-Acting • 1-1200 A

1
UL Class T Fuses

Ordering Information
1
2
3
6
10
15
20

25
30
35
40
45
50
60

AMPERE RATINGS
70
175
80
200
90
225
100
250
110
300
125
350
150
400

450
500
600
700
800
900*
1000

1100
1200

*JLLS only
Note: Contact the factory for RoHS compliant Class T fuses.

Description
JLLN / JLLS fuses are less than 1/3 the size of comparable
Class R fuses and are typically used for short circuit
protection of drives and surge sensitive components.
When rated in accordance with the NEC®, JLLN / JLLS
fuses provide fast-acting overload and short circuit
protection for non-inductive circuits and equipment.

VOLTAGE

AMP

JLLS
JLLN

600 V
300 V

6
10

CATALOG
NUMBER
JLLS006
JLLN010

ORDERING
NUMBER
JLLS006.T
JLLN010.T

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/jlln

Features/Benefits
•	
•	
•	
•	

SERIES

Extremely current-limiting
Compact design
200 kA Interrupting Rating
JLLN 35-60 A available with PCB mounts (see datasheet)

littelfuse.com/jlls

Recommended Fuse Holders
LFT30 Series....................................................................... 94
LFT60 Series....................................................................... 94
LSCR Series for 700-800 A............................................... 120

Applications
•	 Variable speed drive protection
•	 Compact mains switches

Dimensions

Specifications

Please refer to the Class T dimensions............................... 25

Voltage Ratings 	AC: 6 00 V (JLLS)
300 V (JLLN)
	
DC: 300 V (JLLS)
160 V (JLLN 1 – 60 A)
125 V (JLLN 70 – 1200 A)
Ampere Range	
1 – 1200 A
Interrupting Ratings	
AC: 200 kA rms symmetrical
	
DC: 20 kA
Approvals	
AC: Standard 248-15, Class T
UL Listed (File: E81895):
JLLN (1 – 1200 A) JLLS (1 – 800 A)
UL Recognized (File: E71611)
JLLS (900 – 1200 A)
CSA Certified (File: LR29862)
JLLN/JLLS (1 – 600 A)
	
DC: UL Listed (File: E81895):
JLLN (35 – 1200 A)
Littelfuse self-certified
JLLN (1 – 30 A) JLLS (1 – 1200 A)
Material	
JLLS: 1 -30 A: Melamine body, Copper caps
35-60 A: Melamine body, Bronze caps
70-1200 A: Melamine body, Copper caps
	
JLLN: 1-30 A: Melamine body, Bronze caps
35-1200 A: Melamine body, Copper caps
Environmental	
RoHS Compliant

Peak Let-Thru Curve
JLLS

Note: For more information, see Peak Let-Thru Table on pg. 25

littelfuse.com

24

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class T

CLASS T DIMENSIONS AND CURRENT-LIMITING EFFECTS
1

Dimensions Inches (mm)

D

B

D
C

A

A

Fig. 1
AMPERES

G

B

FIGURE
NUMBER

1 – 30

1

35 – 60

1
2

70 – 100

3

110 – 200

3

225 – 400

3

450 – 600

3

700 – 800

3

900 – 1200

3

C

F

F

E
A

Fig. 2

Fig. 3
DIMENSIONS INCHES (mm)

SERIES
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS
JLLN
JLLS

D

A

B

C

D

E

F

G

⁄ (22.2)
11⁄2 (38.1)
78
⁄ (22.2)
19 ⁄16 (39.7)
2 5 ⁄32 (54.8)
2 61 ⁄64 (75.0)
2 7⁄16 (61.9)
3 1⁄4 (82.6)
2 3 ⁄4 (69.9)
3 5 ⁄8 (92.1)
31 ⁄16 (77.8)
3 63 ⁄64 (101.2)
3 3 ⁄8 (85.7)
4 21 ⁄64 (109.9)
4 (101.6)
5.27 (133.9)

—
—
—
13 16
⁄ (20.6)
19 ⁄16 (39.7)
223 ⁄ 64 (59.9)
111 ⁄ 16 (42.9)
21⁄2 (63.5)
127⁄32 (46.8)
223 ⁄32 (69.1)
2 1 ⁄ 32 (51.6)
2 61 ⁄64 (75.0)
2 7⁄ 32 (64.3)
311 ⁄64 (80.6)
2 17⁄32 (64.3)
3.80 (96.5)

⁄ (7.1)
9 32
⁄ (7.1)
9 32
⁄ (7.1)
13 32
⁄ (10.3)
3 4
⁄ (19.1)
3 4
⁄ (19.1)
78
⁄ (22.2)
78
⁄ (22.2)
1 (25.4)
1 (25.4)
11 ⁄4 (31.8)
11 ⁄4 (31.8)
13 ⁄4 (44.5)
13 ⁄ 4 (44.5)
2 (50.8)
2 (50.8)

⁄ (10.3)
9 16
⁄ (14.3)
9 16
⁄ (14.3)
1 (25.4)
13 16
⁄ (20.6)
13 16
⁄ (20.6)
11 ⁄16 (27.0)
11 ⁄16 (27.0)
15 ⁄16 (33.3)
119 ⁄32 (40.5)
119 ⁄32 (40.5)
2 1 ⁄16 (52.4)
2 1 ⁄16 (52.4)
21⁄2 (63.5)
21⁄ 2 (63.5)
2.63 (66.8)

—
—
—
1 16
⁄ (1.6)
27 32
⁄ (21.4)
141 ⁄64 (41.7)
27 32
⁄ (21.4)
121 ⁄32 (42.1)
53 64
⁄ (21.0)
123 ⁄32 (43.7)
78
⁄ (22.2)
49 64
1 ⁄ (44.8)
78
⁄ (22.2)
55 64
1 ⁄ (47.2)
11 ⁄32 (26.2)
2.30 (58.4)

—
—
—
13 ⁄32 (27.8)
9 32
⁄ (7.1)
9 32
⁄ (7.1)
11 32
⁄ (8.7)
11 32
⁄ (8.7)
13 32
⁄ (10.3)
13 32
⁄ (10.3)
31 64
⁄ (12.3)
31 64
⁄ (12.3)
35 64
⁄ (13.9)
35 64
⁄ (13.9)
39 64
⁄ (15.5)
0.67 (15.5)

—
—
—
—
1 8
⁄ (3.2)
1 8
⁄ (3.2)
3 16
⁄ (4.8)
3 16
⁄ (4.8)
1 4
⁄ (6.4)
1 4
⁄ (6.4)
5 16
⁄ (7.9)
5 16
⁄ (7.9)
3 8
⁄ (9.5)
3 8
⁄ (9.5)
7 16
⁄ (11.1)
0.44 (11.2)

78

9 32

13 32

Current-Limiting Effects of JLLN (300 V) fuses

Current-Limiting Effects of JLLS (600 V) fuses

APPARENT RMS SYMMETRICAL CURRENT FOR
VARIOUS FUSE RATINGS
30 A 60 A 100 A 200 A 400 A 600 A 800 A 1200 A

APPARENT RMS SYMMETRICAL CURRENT FOR
SHORT
VARIOUS FUSE RATINGS
CIRCUIT
CURRENT* 30 A 60 A 100 A 200 A 400 A 600 A 800 A 1200 A

SHORT
CIRCUIT
CURRENT*

5,000

700

775

1,100

1,650

3,500

4,000

5,000

5,000

5,000

750

1,225

1,810

2,500

4,600

5,000

5,000

5,000

10,000

900

1,000

1,400

2,100

4,400

5,100

6,750

8,250

10,000

945

1,525

2,300

3,150

6,000

8,500

9,400

10,000

1,000 1,100

1,600

2,400

5,000

5,900

7,750

10,000

15,000

1,050 1,700

2,610

3,600

6,600

9,750

10,500 13,000

10,500 11,000 14,750

15,000
20,000

1,100 1,250

1,800

2,700

5,500

6,500

8,750

11,000

20,000

1,150 1,900

2,900

3,950

7,250

25,000

1,230 1,300

1,950

2,900

6,000

7,000

9,500

12,000

25,000

1,300 2,050

3,100

4,250

8,000

11,500 12,500 15,500

30,000

1,300 1,475

2,050

3,100

6,400

7,500

10,000 12,500

30,000

1,375 2,150

3,300

4,500

8,250

12,000 13,750 16,500

35,000

1,330 1,575

2,150

3,300

6,750

7,750

10,500 13,500

35,000

1,400 2,250

3,500

4,750

8,500

13,000 14,000 17,000

1,425 2,400

3,650

4,950

8,700

14,000 14,750 18,000
14,500 16,000 20,000

40,000

1,430 1,600

2,300

3,500

7,000

8,000

11,000 14,000

40,000

50,000

1,500 1,750

2,400

3,700

7,500

8,750

12,000 15,000

50,000

1,600 2,450

3,900

5,350

9,500

60,000

1,700 1,900

2,700

4,000

8,000

9,500

12,500 16,000

60,000

1,650 2,625

4,150

5,650

10,000 15,500 17,300 21,000

80,000

1,850 2,100

2,800

4,400

9,000

10,500 14,000 17,500

80,000

1,825 2,800

4,570

6,250

11,000 17,000 18,750 23,000

100,000

2,000 2,250

3,150

4,800

9,750

11,500 15,000 18,500

100,000 2,000 3,100

4,950

6,700

12,000 18,000 20,000 25,000

150,000

2,300 2,600

3,600

5,500

11,000 13,000 17,500 22,000

150,000 2,250 3,400

5,650

7,700

13,000 21,000 23,000 28,500

12,000 14,500 19,500 24,000

200,000 2,450 3,800

6,200

8,450

15,000 23,000 25,000 31,000

200,000

2,600 2,800

3,900

6,000

*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves

*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves

© 2014 Littelfuse POWR-GARD® Products Catalog

25

littelfuse.com

UL Class T Fuses

C

Fuses – UL Class G

SLC SERIES FUSES
QPL

480/600 Vac • Time-Delay • 1/2 -60 A

1
UL Class G Fuses

Ordering Information
/
1
2

1 2

SERIES
SLC

AMPERE RATINGS
6
12
25
8
15
30
10
20
35

3
4
5
AMP
10

40
45
50

60

CATALOG NUMBER ORDERING NUMBER
SLC010
0SLC010.T

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/slc

Recommended Fuse Holders
LFG60 Series (1-20 A)......................................................... 99
LFG48 Series (25-60 A)....................................................... 99

Description
Littelfuse SLC fuses provide cost effective branch circuit
protection. Fuse length varies to prevent over-fusing.
Compact Class G fuses were the first fuse series to
approach midget fuse dimensions and meet NEC®
requirements for branch-circuit protection.

Dimensions
A

•	
•	
•	
•	

Branch circuit rated
Current-limiting
100 kA interrupting rating
600 Vac rated 1/2 -20 A

B

Applications

AMPERES

•	 Branch circuit protection

/ – 15
20
25, 30
35 – 60
1 2

Specifications
Voltage Ratings 	

AC: 6 00 Vac or less (1/2 – 20 A)
480 Vac or less (25 – 60 A)
	
DC: 170 Vdc (Littelfuse self-certified)
1/2 – 60 A
Ampere Range	
AC: 100 kA rms symmetrical
Interrupting Ratings	
	
DC: 10 kA
Approvals	
Standard 248-5, Class G
	
UL Listed (File: E81895)
	
CSA Certified (File: LR29862)
	
Federal Specification WF-1814
	(QPL-W-F-1814)
Material	
1/2-30 A: Melamine body,
Bronze cap (nickel plated)
	
35-60 A: Melamine body
Brass cap (silver plated)
Environmental	
RoHS Compliant

littelfuse.com

D

C

Features/Benefits

26

DIMENSIONS INCHES (mm)
A
1 5 /16 (33.3)
1 13/32 (35.7)
1 5 /8 (41.3)
2 1/4 (57.2)

B
/ (9.5)
3 /8 (9.5)
3 /8 (9.5)
3 /8 (9.5)
3 8

C
/ (7.1)
9 /32 (7.1)
9 /32 (7.1)
1/2 (12.7)
9 32

D
/ (10.3)
13 /32 (10.3)
13 /32 (10.3)
13 /32 (10.3)

13 32

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class CC / CD

CCMR SERIES POWR-PRO ® FUSES
		

600 Vac • Dual Element • Time-Delay • 2/10 -60 A

1

Ordering Information
AMPERE RATINGS
2
3 1/2
6 1/4
2 1/4
4
7
2 1/2
4 1/2
7 1/2
2 8/10
5
8
3
5 6/10
9
3 2/10
6
10

1
1 1/4
1 4/10
1 1/2
1 6/10
1 8/10

SERIES
CCMR
CCMR

AMP
10
45

ROHS
•

CATALOG NUMBER
CCMR010
CCMR045

12
15
17 1/2
20
25
30

35
40
45
50
60

ORDERING NUMBER
CCMR010.TXP
CCMR045.T

Web Resources
Download TC Curves, CAD drawings and other technical
information: littelfuse.com/ccmr

Description

Recommended Fuse Holders

The CCMR series is ideal for space saving protection
of motors up to 40 hp*. It was designed specifically to
withstand sustained starting currents of small motors. The
CCMR 60 fuse is the smallest 60 A fuse available rated at
600 V. Compared to other UL Listed fuses, Class CC fuses
are the most current-limiting, rating for rating.

LFC600 Series...................................................................101
L60030C Series.................................................................101
LFPSC Touch-Safe Series...................................................110

Dimensions
Please refer to the Class CC/CD dimensions..................... 29

Features/Benefits
•	
•	
•	
•	

Peak Let-Thru Curve

POWR-PRO® Performance
Extremely current-limiting
Ratings up to 60 Amps
300 kA Interrupting Rating (self-certified)

1,000,000

Applications
•	 Motor and motor branch circuit protection

Specifications

Ampere Rating 	
Interrupting Rating	
	
Approvals	

	
Material	
Environmental 	
Country of Origin 	

30A 15A-

AC: 600 Vac or less
DC: 250 V (CCMR 2 /10 – 2 A)
(CCMR 41/2 – 10 A)
(CCMR 35– 60 A)
300 V (CCMR 21/4 – 4 A)
500 V (CCMR 12– 30 A)
2 /10 – 60 A
AC: 2 00 kA rms symmetrical
300 kA Littelfuse self-certified
DC: 20 kA
AC: S tandard 248-4, Class CC
UL Listed 2 /10 -30 A (File: E81895)
Standard 248, Class CD
UL Listed 35-60 A (File: E81895)
CSA Certified (File: LR29862)
DC: Littelfuse self-certified
2/10-30 A: Melamine body,
Bronze cap (nickel plated)
RoHS Compliant (except 35-60 A)
Mexico

PEAK LET- THRU IN AMPERES

Voltage Rating 	
	

60A -

100,000

10,000

1,000

100

100

1,000

10,000

100,000

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

Note: For
more information, see Peak
Let-Thru Table on pg. 29FUSE CATALOG NUMBER:
TIME CONSTANT/POWER FACTOR:
TEST VOLTAGE:
FOR CATALOG PAGE ONLY

*C onsult Motor Protection Tables on page 208 in the Technical Application Guide
section for specific motor sizing information.

© 2014 Littelfuse POWR-GARD® Products Catalog

4A2.25A-

CCMRP 2.25A - 30A

BASIS FOR DATA:

27

LITTELFUSE, INC.
CHICAGO, IL. USA

PEAK LET-THRU CHARACTERISTIC CURVES
- DATA GENERATED IN EXCEL -

DRAWN BY: LLL
DATE:
11/12/12
REVISION: C
DRAWING NO.:

littelfuse.com
SHEET 9 OF 9

FCC05-CCMRP

UL Class CC/CD Fuses

/
1/4
3/10
1/2
6/10
8/10
2 10

Fuses – UL Class CC

KLDR / KLKR SERIES FUSES
KLDR Series
600 Vac/300 Vdc • Time-Delay • 1/10 -30 A

Ordering Information

Description

UL Class CC Fuses

1

KLDR fuses are time-delay fuses designed to
protect control transformers, so­le­noids and
similar inductive components with high mag­
ne­tiz­ing currents during the first half-cycle.
They provide ex­cel­lent protection of motor
branch circuits con­tain­ing IEC or NEMA
rated motor con­trol­lers or contactors.

Specifications
Voltage Rating 	
	
Ampere Range 	
Interrupting Rating	
	
Approvals	

AC: 600 Vac or less
DC: 300 Vdc
1/10 – 30 A
AC: 200 kA rms symmetrical
DC: 20 kA
AC: S tandard 248-4, Class CC
UL Listed 1/10 -30 A (File: E81895)
CSA Certified 1/10 -30 A (File: LR29862)
DC: Littelfuse self-certified
Melamine body
Bronze caps (nickel plated)
RoHS Compliant
Mexico

	
Material 	
	
Environmental 	
Country of Origin 	

/
1/8
15/100
3/16
2/10
1/4
3/10
4/10
1/2
1 10

/
3/4
8/10
1
1 1/8
1 1/4
1 4/10
1 1/2
1 6/10
6 10

AMPERE RATINGS
1 8/10
2
2 1/4
2 1/2
2 8/10
3
3 2/10
3 1/2
4

SERIES

AMP

KLDR

10

4 1/2
5
5 6/10
6
6 1/4
7
7 1/2
8
9

CATALOG
NUMBER
KLDR010

10
12
15
17 1/2
20
25
30
—
—
ORDERING
NUMBER
KLDR010.TXP

Web Resources
For additional information, visit:
littelfuse.com/kldr

Recommended Fuse Holders
L60030C Series..................................................... 101
LFPSC Touch-Safe Series....................................... 110

Dimensions

Please refer to the Class CC dimensions................ 29

KLKR Series
600 Vac/300 Vdc • Fast-Acting • 1/10 -30 A

Description
KLKR Series Class CC fuses are fast-acting
fuses intended for general purpose branch
circuit protection. Their compact size, fastacting overload response, and highly currentlimiting design make them ideal for use in
OEM equipment and control panels.

Specifications
Voltage Rating 	
	
Ampere Range 	
Interrupting Rating	
	
Approvals	

	
Material 	
	
Environmental 	
Country of Origin 	
littelfuse.com

AC: 600 Vac or less
DC: 300 Vdc
1/10 – 30 A
AC: 200 kA rms symmetrical
DC: 20 kA
AC: S tandard 248-4, Class CC
UL Listed 1/10 -30 A (File: E81895)
CSA Certified 1/10 -30 A (File: LR29862)
DC: Littelfuse self-certified
Melamine body
Bronze caps (nickel plated)
RoHS Compliant
Mexico

Ordering Information
/
1/8
2/10
1/4
3/10
1 10

AMPERE RATINGS
2 1/2
6
3
7
1
3 1/2
8
1 1/2
4
9
2
5
10
/
3/4
1 2

SERIES

AMP

KLKR

12

CATALOG
NUMBER
KLKR012

12
15
20
25
30
ORDERING
NUMBER
KLKR012.T

Web Resources
For additional information, visit:
littelfuse.com/klkr

Recommended Fuse Holders
L60030C Series..................................................... 101
LFPSC Touch-Safe Series....................................... 110

Dimensions
Please refer to the Class CC dimensions................ 29
28

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Class CC / CD

CLASS CC / CD DIMENSIONS AND CURRENT-LIMITING EFFECTS
1

Dimensions Inches (mm)

.25

1.50

.41

0-30 A

.850

(10.3)

35-60 A

(21.6)

.125

.50

(3.2)

(12.7)

1.880
(47.8)

Current-Limiting Effects of CCMR (600 V) fuses
SHORT
CIRCUIT
CURRENT* 2.25A
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
50,000
60,000
80,000
100,000
150,000
200,000

203
256
293
323
348
370
389
407
438
466
513
552
632
696

UL Class CC/CD Fuses

(6.4)

(38.1)

APPARENT RMS SYMMETRICAL CURRENT FOR VARIOUS FUSE RATINGS
2.5A

3A

4A

5A

6.25A

7.5A

8A

10A

12A

15A

20A

30A

35A

40A

45A

50A

60A

224
282
323
356
383
407
429
448
483
513
564
608
696
766

287
361
413
455
490
521
548
573
617
656
722
778
890
980

289
364
416
458
493
524
552
577
622
661
727
783
897
987

460
580
664
730
787
836
880
920
991
1,053
1,159
1,249
1,430
1,574

472
595
681
750
808
858
903
944
1,017
1,081
1,190
1,282
1,467
1,615

442
557
637
702
756
803
845
884
952
1,012
1,114
1,200
1,373
1,511

437
551
631
694
748
795
837
875
942
1,001
1,102
1,187
1,359
1,496

359
452
517
569
613
651
686
717
772
821
903
973
1,114
1,226

369
465
532
585
630
670
705
737
794
844
929
1,001
1,146
1,261

435
548
627
690
743
790
832
870
937
995
1,096
1,180
1,351
1,487

355
447
512
563
607
645
679
709
764
812
894
963
1,102
1,213

621
783
896
987
1,063
1,129
1,189
1,243
1,339
1,423
1,566
1,687
1,931
2,125

1,170
1,480
1,695
1,870
2,015
2,145
2,260
2,360
2,545
2,705
2,985
3,215
3,685
4,060

1,240
1,565
1,795
1,980
2,135
2,270
2,390
2,500
2,695
2,865
3,160
3,405
3,905
4,300

1,320
1,670
1,915
2,110
2,275
2,420
2,550
2,665
2,875
3,055
3,365
3,630
4,160
4,580

1,070
1,355
1,555
1,710
1,845
1,965
2,070
2,165
2,330
2,480
2,730
2,945
3,375
3,720

1,525
1,930
2,200
2,430
2,620
2,780
2,885
3,025
3,200
3,350
3,540
3,685
4,030
4,230

*Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves

Peak Let-Thru Curve KLDR

Peak Let-Thru Curve KLKR

1,000,000

1000000

100000

PEAK LET-THRU IN AMPERES

PEAK LET- THRU IN AMPERES

100,000

8A 6A -

10,000

4A -

10000

30 A
25 A
20 A
15 A
12 A
1000

1,000

100

1,000

10,000

100,000

TEST VOLTAGE:

TIME CONSTANT/POWER FACTOR:

BASIS FOR DATA:

LITTELFUSE, INC.
CHICAGO, IL. USA

FUSE CATALOG NUMBER:

KLDRP 4A - 30A
DRAWN BY: LLL
DATE:
11/12/12
REVISION: B

200000

100000

AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

© 2014 Littelfuse POWR-GARD® Products Catalog

10000

100

1000

100

100

29

littelfuse.com

Fuses – UL Supplemental

10 x 38mm MIDGET FUSES
1

KLK Series
Fast-Acting Fuse
600 Vac

KLKD Series
Fast-Acting Fuse
600 Vac/dc

FLM Series
Time-Delay Fuse
250 Vac

UL Supplemental Fuses

QPL

QPL

AMPERE RATINGS
1
5
1 1/2
6
2
7
2 1/2
8
3
9
3 1/2
10
4
12

/
/
2 /10
1/4
3 /10
1/2
3 /4
1 10
1 8

15
20
25
30
—
—
—

AMPERE RATINGS
1
5
1 1/2
6
2
7
2 1/2
8
3
9
3 1/2
10
4
12

/
/
2 /10
1/4
3 /10
1/2
3 /4
1 10
1 8

15
20
25
30
—
—
—

Specifications

Specifications

Fast-acting, high-interrupting capacity fuse
designed for control circuits, HID lighting,
street-lighting, meter circuits.

Fast-acting, high DC rated fuse used in solar
combiner boxes, DC control circuits, UPS
protection. Available in PC board mount.

Voltage Ratings	
	
Interrupting Ratings	
	
	
Approvals	
	
Dimensions	
	
littelfuse.com/klk

600 Vac/dc
Voltage Ratings	
Interrupting Ratings	 100 kA @ 600 Vac
	
10 kA @ 600 Vdc (UL2579)
	
50 kA @ 600 Vdc (UL248-14)
	
(capable of 200 kA)
Approvals	
UL Listed (E339112 & E10480)
	
CSA Certified (LR29862)
Dimensions	
L	 38.1mm (1 1/2”)
	
D	 10.31mm (13/32”)
littelfuse.com/klkd

600 Vac
500 Vdc
100 kA @ 600 Vac
50 kA @ 500 Vdc
(capable of 200 kA)
UL Listed (E10480)
CSA Certified (LR29862)
L	 38.1mm (1 1/2”)
D	 10.31mm (13/32”)

BLN Series
Fiber Body Fast-Acting Fuse
250 Vac

FLQ Series
Time-Delay Fuse
500 Vac

/
/
2 /10
1/4
3 /10
4 /10
1/2
6 /10

1 10
15 100

AMPERE RATINGS
/
2
4 1/2
1
2 1/4
5
1 1/8
2 1/2
5 6 /10
1 1/4
2 8 /10
6
1 4 /10
3
6 1/4
1 1/2
3 2 /10
7
1 6 /10
3 1/2
8
1 8 /10
4
9

10
12
15
20
25
30
—
—

8 10

Specifications
250V time-delay fuses used to protect
circuits with high in-rush. Especially suited for
supplemental protection of small motors.
Voltage Ratings	
	
Interrupting Ratings	
Approvals	
	
Dimensions	
	
littelfuse.com/flm

250 Vac
125 Vdc self-certified @ 10 kA
10 kA @ 250 Vac
UL Listed (File: E10480)
CSA Certified (029862_0_000)
L	 38.1mm (1 1/2”)
D	 10.31mm (13/32”)

BLF Series
Laminated Fast-Acting Fuse
125/250 Vac

QPL

/
/
15 /100
3 /16
2 /10
1/4
3 /10
4 /10
1 10
1 8

AMPERE RATINGS
/
2
5
/
2 1/4
5 6 /10
8 /10
2 1/2
6
1
3
6 1/4
1 1/8
3 2 /10
7
1 1/4
3 1/2
8
1 1/2
4
9
1 6 /10
4 1/2
10
1 2
6 10

12
14
15
20
25
30
—
—

Specifications
500V time-delay fuses for supplemental
protection of control power transformers,
solenoids, and circuits with high in-rush. Ideal
for 480 V systems.
Voltage Ratings	
500 Vac
	
300 Vdc self-certified @ 10 kA
Interrupting Ratings	 10 kA @ 500V ac
Approvals	
UL Listed (E10480)
	
CSA Certified (LR29862)
L	 38.1mm (1 1/2”)
Dimensions	
	
D	 10.31mm (13/32”)
littelfuse.com/flq

littelfuse.com

1
1 1/2
2

AMPERE RATINGS
3
6
12
4
8
15
5
10
20

25
30
—

Specifications
Fiber tube, 250 volt BLN fuses provide lowcost protection for military applications and
control circuits.
Voltage Ratings	
Interrupting Ratings	
Approvals	
	
Dimensions	
	
littelfuse.com/bln

250 Vac
10 kA @ 250 Vac
UL Listed (E10480)
CSA Certified (LR29862)
L	 38.1mm (1 1/2”)
D	 10.31mm (13/32”)

30

/
1
1 1/2
2
2 1/2
1 2

AMPERE RATINGS
3
7
4
8
5
9
6
10
6 1/4
12

15
20
25
30
—

Specifications
Laminated tube BLF fuses are the lowest price
midget fuse. They are suitable for control circuit
and instrument protection in dry locations.
Voltage Ratings	
	
Interrupting Ratings	
Approvals	
	
Dimensions	
	
littelfuse.com/blf

250 Vac 1/2 - 15 A
125 Vac 20 - 30 A
10 kA @ rated Vac
UL Listed (E10480)
CSA Certified (LR29862)
L	 38.1mm (1 1/2”)
D	 10.31mm (13/32”)

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – UL Supplemental

10 x 38mm MIDGET FUSES
BLS Series
Fast-Acting Fuse
600 Vac / 250 Vac

AMPERE RATINGS
1
3
1 1/2
4
1 6 /10
5
1 8 /10
6
2
7

8
10
—
—
—

Specifications
Slightly shorter than a traditional 10 x 38, BLS
fuses provide space saving protection for low
amperage applications.
Voltage Ratings	
	
Interrupting Ratings	
Approvals	
	
Dimensions	
	
littelfuse.com/bls

600 Vac 2/10 - 5 A
250 Vac 6 - 10 A
10 kA @ rated Vac
UL Listed (E10480)
CSA Certified (LR29862)
L	 34.9 mm (1 3/8”)
D	 10.31 mm (13/32”)

FLU Series
Multimeter Protection
1000 Vac/dc

1
1 6 /10

AMPERE RATINGS
2
3

FLA Series
Time-Delay Pin Indicating Fuse
125 Vac

5
6

Specifications
Same physical size as the BLS fuse with more
time delay. Designed to protect gaseous vapor
fixtures, HID ballasts and other electronic
lighting circuits.
Voltage Ratings	
Interrupting Ratings	
Approvals	
	
Dimensions	
	
littelfuse.com/klq

/
/
2 /10
1/4
3 /10
4 /10
1/2
6 /10

1 10
15 100

600 Vac
10 kA @ rated Vac
UL Listed (E10480)
CSA Certified (LR29862)
L	 34.9 mm (1 3/8”)
D	 10.31 mm (13/32”)

AMPERE RATINGS
/
2
4 1/2
1
2 1/4
5
1 1/8
2 1/2
5 6 /10
1 1/4
2 8 /10
6
1 4 /10
3
6 1/4
1 1/2
3 2 /10
7
1 6 /10
3 1/2
8
1 8 /10
4
10
8 10

12*
15*
20*
25*
30*
—
—
—

*12-30 A are dual tube design

Specifications
Pin indicating time-delay fuses. Use in
conjunction with special fuse blocks to
operate mechanical signal switches or
energize alarm circuits.
Voltage Ratings	
Interrupting Ratings	
Approvals	
Dimensions	
	
littelfuse.com/fla

125 Vac
10 kA @ rated Vac
UL Listed (E10480)
L	 38.1 mm (1 1/2”)
D	 10.31 mm (13/32”)

10 x 38 Midget Fuse Holder Configurations
OPEN FUSE BLOCK

PC BOARD MOUNT
FUSE BLOCK

L60030M
pg. 101

L60030MPCB
pg. 103

Specifications
Multimeter protection fuses.
Voltage Rating	
Interrupting Rating 	
	
Ampere Ratings	
Time Constant	
Approvals	
	
Dimensions 	
	
littelfuse.com/flu

1000 Vac/Vdc
44
⁄100 A: 10 kA
11 A: 20 kA
44
⁄100 & 11 A
10 ms
UL Recognized (E10480)
CSA Certified (LR29862)
44
⁄100 A: 13⁄32” x 13⁄8”
11 A: 13⁄32” x 11⁄2”

TOUCH SAFE

LFPSM (600 V)
pg. 110

© 2014 Littelfuse POWR-GARD® Products Catalog

31

LFPHV (1000 V)
pg. 109

littelfuse.com

1
UL Supplemental Fuses

/
/
1/2
3 /4
8 /10

2 10
4 10

KLQ Series
Increased Time-Delay
600 Vac

Section Overview
Diverse application needs require a broad range of fuses. Littelfuse
offers a full line of fuses for various applications. As the market leader
in Automotive and Electronics fuses, we are able to deliver innovative
circuit protection solutions to our customers. Visit littelfuse.com for
our full line of Automotive and Electronics solutions.

ELECTRONIC FUSES AND BLADE FUSES

Table of Contents
Glass / Electronic Fuses.............................................................. 33
Blade / Automotive Fuses............................................................ 36

littelfuse.com

32

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Glass / Electronic

HIGH DC VOLTAGE AND PC BOARD MOUNT FUSES
314 000P Series

505 Series
Lead-Free 3AB, Fast-Acting

477 Series
5 x 20 mm Slo-Blo® Fuse

324 000P Series

Dimensions mm (inches)
3AG/3AB
6.35 (.25)
31.75
(1.25)

2

0.813 (.032)
1.016 (.040)

229 000P Series

10
12

AMPERE RATINGS
16
20

25
30

AMPERE RATINGS
2
5
3.15
6.3
4
8

.5
.8
1

230 000P Series

32.72
(1.288)

38.1
(1.5)

2AG

10
12
16

4.7 (.184")

Specifications

14.48
(.57")

14.48
(.57")

Specifications

A 500 Vac/Vdc rated ceramic fuse with
remarkable interrupting rating in a compact
6.3 x 32 mm package, well suited for circuit
protection in high energy applications.
Voltage Rating	
450 Vac (10 – 12 A)
	
250 Vdc (10 – 12 A)
	
500 Vac/dc (16 – 30 A)
Sample Part	0505010.MXP*
Axial Lead	
505_XEP Series
Dimensions	
L 31.75 mm (1.25”)
	
D 6.35 mm (.25”)
littelfuse.com/505
*Bulk configurations only

500 Vac/400 Vdc rated, 5 x 20 mm, time-lag,
surge withstand ceramic body fuse.
500 Vac
Voltage Rating	
	
400 Vdc
Sample Part	0477002.MXP*
Axial Lead	
477_XEP Series
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
littelfuse.com/477
*Bulk configurations only

273 Series
Very Fast-Acting Microfuse

251 Series
Fast-Acting Pico® II Fuse

.635
(.025")

4.5
(.177")

5 x 20 mm

38.1
(1.50") TYP.

20 (.79)
5.2 (.20)
5.1 (.22)
40 (1.57)

5.1 (.22)
22.5 (.89)
max.

.65* (.026)

6.0 (.24)
max.

*Ratings above 6.3 A have 0.8 mm diameter lead.
Ratings above 12 A have 1.2 m diameter lead.

451 Series
NANO2® Very Fast-Acting
Add “L” suffix when
ordering RoHS compliant
451 series

.002
.005
.010
.015

AMPERE RATINGS
.031 .125 .400 .750
.050 .200 .500 .800
.062 .250 .600
1
.100 .300 .700
1.5

2
3
4
5

.062
.125
.250
.375

AMPERE RATINGS
.500
1.25
3
.630
1.5
3.5
.750
2
4
1
2.5
5

7
10
12
15

AMPERE RATINGS
0.062 0.25 0.630 1.5
3.15
0.1 0.315 0.750 1.6
3.5
0.125 0.375 0.800
2
4
0.160 0.400
1
2.5
5
0.2
0.5
1.25
3
6.3

7
8
10
12
15

Specifications

Specifications

Specifications

Similar to 272 and 278 series, except has
transparent cap for visual indication of
fuse status. *See web for approvals by part.

Subminiature fuse for soldered mounting on
printed circuit boards. Available on tape and
reel for automatic insertion. *See web for
approvals by part.

The Nano2 SMF Fuse is a very small, Wire-inAir (WIA) square shape surface mount fuse
which is very suitable for the secondary side
circuit over-current protection applications
and is designed for PCB using surface mount
technology
*See web for approvals by part.

125 Vac/dc
Voltage Rating	
Sample Part	0273002.V

125 Vac/dc 1/16 – 10 A
Voltage Ratings	
		
32 Vac/dc 12 – 15 A
Sample Part	0251001.NAT1L

littelfuse.com/273
6.35
(.25")

8.89
(.35")

4.32
(.17")
2.54 (.10")

© 2014 Littelfuse POWR-GARD® Products Catalog

Voltage Rating	 65 – 125 V
Sample Part	0451.125MP

littelfuse.com/251
7.11 (.280")
REF.

LF
0.64 (.025") DIA.
(1/16 – 10A)
0.81 (.032") DIA.
(12 – 15A)

littelfuse.com/451

1A
2.80 (.110")
DIA. MAX.

33

littelfuse.com

Glass / Electronic Fuses

6.985 (.275)

Fuses – Glass / Electronic

LEADED AND CARTRIDGE FUSES
312/318 Series
3AG Fast-Acting

313/315 Series
3AG Slo-Blo®

314/324 Series
3AB Fast-Acting

Glass / Electronic Fuses

2

.062
.100
.125
.15
.175
.187

AMPERE RATINGS
.200 .750
1.8
5
.250
1
2
6
.300 1.25 2.25
7
.375
1.5
2.5
8
.500
1.6
3
10
.600 1.75
4
12

15
20
25
30
35
—

Specifications
Designed for fast-acting protection of
electronic equipment and appliances. The
“standard” fast-acting, glass tube fuse.
Voltage Ratings	
250 Vac 1/100 – 10 A
	
32 Vac 12 – 35 A
Dimensions	
L 31.75 mm (1.25”)
	
D 6.35 mm (.25”)
Sample Part 	
0312005.VXP
For fuses with axial leads, request 318 Series.
littelfuse.com/312

.010
.031
.040
.062
.100
.125
.150

.175
.187
.200
.250
.300
.375
.400

AMPERE RATINGS
.500 1.25 2.8
.600 1.5
3
.700 1.6 3.2
.750 1.8
4
.800
2
5
1
2.25 6.25
1.2 2.5 6.3

7
8
10
12
15
20
25

30
—
—
—
—
—
—

Specifications
313 and 315 series fuses have time-delay
in the overload range, providing superior
protection for inductive loads. ID feature
available which discolors upon opening.
Voltage Ratings	
250 Vac 1/100 – 8 A
	
32 Vac 10 – 30 A
Dimensions	
L 31.75 mm (1.25”)
	
D 6.35 mm (.25”)
Sample Part	0313005.VXP
For fuses with axial leads, request 315 Series.
For Fuses with ID, add “ID” suffix.

.375
.500
.750
1

AMPERE RATINGS
2
6
12
3
7
15
4
8
20
5
10
25

30
40
—
—

Specifications
Similar to 312 series, but ceramic tube
permits higher interrupting ratings and voltage
ratings: 250 volt ratings to 40 amps.
Voltage Rating	
250 Vac 3/8 – 40 A
	
125 Vdc 3/8 – 30 A
	
150 Vdc 40 A
Dimensions	
L 31.75 mm (1.25”)
	
D 6.35 mm (.25”)
Sample Part	03145005.VXP
For fuses with axial leads, request 324 Series.
littelfuse.com/314

littelfuse.com/313

229/230 Series
2AG Slo-Blo®

326/325 Series
3AB Slo-Blo®

.010
.031
.062
.100
.125
.150
.175

AMPERE RATINGS
.187 .600
1.5
4
.200 .700
1.6
5
.250 .750
2
6.25
.300 .800
2.5
7
.375
1
2.8
8
.400
1.2
3
10
.500 1.25
3.2
12

15
20
25
30
—
—
—

Specifications
The 326 series fuse has time-delay similar to
the 313 series, but the ceramic body permits
higher voltage ratings for the 8 – 30 ampere
sizes and faster opening of short-circuits.
Voltage Ratings	
250 Vac 1/100 – 30 A
	
125 Vdc 1/4 – 3 A
	
125 Vdc 12 – 30 A
Dimensions	
L 31.75 mm (1.25”)
	
D 6.35 mm (.25”)
Sample Part 	
0326.100VXP
For fuses with axial leads, request 325 Series.
littelfuse.com/326

.250
.350
.375
.500
.600

AMPERE RATINGS
.750
2
.800
2.25
1
2.5
1.25
3
1.5
3.5

225/224 Series
2AG Fast-Acting

4
5
6
7
—

Specifications
2AG indicating fuses instantly identify
themselves upon opening by showing a
discoloration of their glass bodies, eliminating
guesswork. This unique design offers the same
quality performance characteristics as the
standard 2AG fuse design.*
Voltage Ratings	
250 Vac 1/4 – 3 1/2 A
	
125 Vac 4 – 7 A
	
125 Vdc 1/4 – 7 A
Dimensions	
L 14.48 mm (.57”)
	
D 4.5 mm (.177”)
Sample Part 	
02291.25VXP
For fuses with axial leads, request 230 Series.
*Must add “S” suffix when ordering indicating fuse

.375
.500
.750

AMPERE RATINGS
1
2.5
4
1.5
3
5
2
3.5
6

7
8
10

Specifications
Fast-acting performance of the 312 series
3AG fuses in less than one-third the space.
For protection of electronic equipment
and appliances.
Voltage Ratings	
250 Vac 3/8 – 3 1/2 A
	
125 Vac 4 – 10 A
	
125 Vdc 3/8 – 3 1/2 A
Dimensions	
L 14.48 mm (.57”)
	
D 4.5 mm (.177”)
Sample Part 	
0225003.VXP
For fuses with axial leads, request 224 Series.
littelfuse.com/225

littelfuse.com/229

Note: All fuses on this page are available in packaged and bulk configurations

littelfuse.com

34

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Glass / Electronic

5 x 20 mm IEC LEADED AND CARTRIDGE FUSES
215 Series
5 x 20 mm IEC Slo-Blo®

216 Series
5 x 20 mm IEC Fast-Acting

217 Series
5 x 20 mm IEC Fast-Acting

2
AMPERE RATINGS
.315 .800
2
5
.400
1
2.5
6.3
.500 1.25 3.15
8
.630
1.6
4
10

12
15
16
20

AMPERE RATINGS
.050 .125 .315
1
2.5 6.3
.063 .160 .500 1.25 3.15
8
.080 .200 .630 1.6
4
10
.100 .250 .800
2
5
12.5

16
—
—
—

.032
.050
.063
.080

AMPERE RATINGS
.100 .250 .630 1.6
4
.125 .315 .800
2
5
.160 .400
1
2.5 6.3
.200 .500 1.25 3.15
8

10
15
—
—

Specifications

Specifications

Specifications

Time-delay protection of electronic equipment
and appliances when fuses to International
Standards are required. Replacement fuse
for foreign equipment.

Fast-acting protection of electronic equipment
and appliances when fuses to International
Standards are required. Replacement fuse for
foreign equipment.

Fast-acting protection of electronic equipment
and appliances when fuses to International
Standards are required. Replacement fuse for
foreign equipment.

Voltage Rating	
250 Vac
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0215005.VXP
For fuses with axial leads, request 215_XEP series.

Voltage Rating	
250 Vac
	
60 Vdc (1.25-3.15, 4-6.3 A only)
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0216005.VXP
For fuses with axial leads, request 216_XEP series.

Voltage Rating	
250 Vac
	
75Vdc (2-3.15 A only)
	
60 Vdc (6.3, 2.-5 A only)
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0217005.VXP
For fuses with axial leads, request 217_XEP series.

littelfuse.com/215

littelfuse.com/216

littelfuse.com/217

235 Series
5 x 20 mm UL/CSA Fast-Acting

218 Series
5 x 20 mm IEC Slo-Blo®

.032
.040
.050
.063
.080

AMPERE RATINGS
.100 .315
1
3.15
.125 .400 1.25
4
.160 .500
1.6
5
.200 .630
2
6.3
.250 .800
2.5
8

10
12.5
15
16
—

Specifications
Time-delay protection of electronic equipment
and appliances when fuses to International
Standards are required. Replacement fuse
for foreign equipment.
Voltage Rating	
250 Vac
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0218005.VXP
For fuses with axial leads, request 218_XEP series.
littelfuse.com/218

.100
.125
.200
.250

AMPERE RATINGS
.300 .700 1.60
3.5
.400 .800
2
4
.500
1
2.5
5
.600 1.25
3
6

7
—
—
—

239 Series
5 x 20 mm UL/CSA Slo-Blo®

AMPERE RATINGS
.080 .200 .500 .800
2
3.20
.100 .250 .600
1
2.5 3.50
.125 .300 .700 1.25
3
4
.150 .400 .750 1.60 3.15
5

7
—
—
—

Specifications

Specifications

5 x 20 mm fuses designed to UL and CSA
standards. Fast-acting protection of electronic
equipment and appliances.

5 x 20 mm fuses designed to UL and CSA
standards. Time-delay protection of electronic
equipment and appliances.

Voltage Ratings	
250 Vac 1/10 – 3 1/2 A
	
125 Vac 4 – 7 A
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0235005.VXP
For fuses with axial leads, request 235_XEP series.

Voltage Ratings	
250 Vac 2/10 – 3 1/2 A
	
125 Vac 4 – 7 A
Dimensions	
L 20 mm (.79”)
	
D 5.2 mm (.20”)
Sample Part	0239005.VXP
For fuses with axial leads, request 239_XEP series.

littelfuse.com/235

littelfuse.com/239

Note: All fuses on this page are available in packaged and bulk configurations

© 2014 Littelfuse POWR-GARD® Products Catalog

35

littelfuse.com

Glass / Electronic Fuses

.125
.160
.200
.250

Fuses – Blade / Automotive

BLADE FUSES
MINI®
Smart Glow

MINI® Fast-Acting

Fuses Rated 58 V
Low Profile MINI®

Specifications

Specifications

Specifications

Smart Glow fuses are innovative
automotive style fuses (ATO, MINI, and
MAXI) that feature an indicator light that
glows when the fuse is blown, saving
time to troubleshoot an open circuit.

The MINI® Fuse, with its miniature
design patented by Littelfuse, meets
the need for more circuits to be
protected while utilizing less space.

The low profile MINI has similar
performance as the standard mini fuse.
The lower overall height allows for more
space and weight savings.

MINI dimensions in mm

Blade / Automotive Fuses

2

Voltage Rating	
Sample Part	

14 Vdc
0MIN010.VPGLO

Voltage Rating	
Sample Part	

Voltage Rating	
Sample Part	

32 Vdc
0MIN020.V

10.90
(.429)
1.00
(.039)
2.58
(.101)

58 Vdc
LMIN010.V

4.46
(.175)

3.81
(.150)

6.15
(.242)

littelfuse.com/lmin

littelfuse.com/mini

Low Profile MINI
dimensions in mm (inches)

8.10
(.319)

0.80
(.031)

3.56
(.140)
2.21
(.087)

MINI Fuses are available in packaged and bulk configurations. See 297 series on web.

ATO® Fast-Acting

ATO®
Smart Glow

ATO® / MINI®
Color Key
ATO dimensions in mm (inches)

CURRENT HOUSING
RATING
COLOR
1A
2A
3A
4A

Specifications

Specifications

Smart Glow fuses are innovative
automotive style fuses (ATO, MINI, and
MAXI) that feature indicator light that
glows when the fuse is blown, saving
time to troubleshoot an open circuit.

The ATO® Fuse was designed and
patented by Littelfuse in 1976 and set
the standard for automotive circuit
protection. It features industry standard
color coding to indicate amperage rating.

Voltage Rating	
Sample Part	

Voltage Rating	
Sample Part	

14 Vdc
0ATO010.VPGLO

5A
7.5 A
10 A
15 A
20 A
25 A

32 Vac/dc
0ATO020.V

30 A
40 A

littelfuse.com/ato

Note: MINI not available in
1 A or 40 A.

ATO Fuses are available in packaged and bulk configurations. See 287 series on web.

MAXI™
Smart Glow

MAXI™ Slo-Blo

MAXI™
Color Key
MAXI dimensions in mm (inches)

CURRENT HOUSING
RATING
COLOR
20 A
25 A
30 A

Specifications

Specifications

Smart Glow fuses are innovative
automotive style fuses (ATO, MINI, and
MAXI) that feature an indicator light that
glows when the fuse is blown, saving
time to troubleshoot an open circuit.

Designed and patented by Littelfuse,
the MAXI™ Fuse is ideal for motor
powered applications which have
large inrush currents.

Voltage Rating	
Sample Part	

14 Vdc
0MAX030.XPGLO

Voltage Rating	
Sample Part	

35 A

32 Vdc
0MAX030.X

40 A
50 A
60 A
70 A
80 A

littelfuse.com/maxi

MAXI Fuses are available in packaged and bulk configurations. See 299 series on web.

littelfuse.com

36

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Blade / Automotive

BLADE FUSES
FHA Blade Fuse Holders—In-Line Fuse Holder
for ATO® Style Blade Fuse

FHAC Blade Fuse Holders—In-Line Splash-Waterproof
Fuse Holder for ATO® Style Blade Fuse

Dimensions in mm

Dimensions in mm

0FHA0002

2
0FHA0001

littelfuse.com/fha

PART
NUMBER
0FHA0001_
0FHA0002_

DESCRIPTION
16AWG/1.3mm2
STRANDED BLACK WIRE
12AWG/3.3mm2
STRANDED ORANGE WIRE

FUSE
RATING

Used with ATO Fuse 1 to 20 A or
25 A and 30 A. Supplied with
two 4” (102mm) wire leads.
Includes protective cover for
harsh environments.

20 A
30 A

Wire length, color and diameter can be
customized upon request.

littelfuse.com/fha

FHM Blade Fuse Holders—In-Line Splash-Waterproof
Fuse Holder for MINI® Style Blade Fuse

PART
NUMBER
FHAC0001_
FHAC0002_

FUSE
RATING

DESCRIPTION
16AWG/1.3mm2
STRANDED BLACK WIRE
12AWG/3.3mm2
STRANDED ORANGE WIRE

20 A
30 A

Wire length, color and diameter can be
customized upon request.

MAH Blade Fuse Holders—In-Line Fuse Holder for
MAXI™ Style Blade Fuse
Dimensions in mm

PART
NUMBER
0FHM0001_
0FHM0002_

Used with MINI Fuse 1 to 20 A
or 25 A and 30 A. Supplied with
two 4.78” (122 mm) wire leads.
Includes protective cover for
harsh environment.

DESCRIPTION
14AWG/2.1mm
STRANDED BLACK WIRE
12AWG/3.3mm2
STRANDED ORANGE WIRE
2

FUSE
RATING
PART
NUMBER
0MAH0001Z

20 A
30 A

WIRE COLOR BLACK

FUSE
RATING
60 A

Supplied with two 6”, 6-gauge wire leads
for up to 60 A MAXI Fuse applications,
this In-Line Fuse holder also provides a
protective cover for harsh under-the-hood
environments. Mounting hole permits
easy bulkhead installation.

Wire length, color and diameter can be
customized upon request.

littelfuse.com/fhm

JCASE® Cartridge
Fuse Rated 32 V

DESCRIPTION

littelfuse.com/mah

JCASE® 32 V
Dimensions in mm

Low Profile JCASE®
Fuse Rated 58 V

JCASE®
Color Key
CURRENT HOUSING
RATING
COLOR
20 A
25 A
30 A
40 A

Specifications

Specifications

The JCASE is a cartridge style fuse
with female terminal design. JCASE
provides both increased time delay
and low voltage drop to protect high
current circuits. JCASE has the ability to
handle in-rush currents. The JCASE was
designed and patented by Littelfuse.

The Low Profile JCASE fuse has
similar performance characteristics as
the standard JCASE fuse. The lower
overall height reduction allows for
more space and weight savings and
also allows for a shorter male blade
terminal, saving additional weight and
material savings in fuse box designs.

littelfuse.com/jcase

© 2014 Littelfuse POWR-GARD® Products Catalog

37

50 A

Low Profile JCASE® 58 V
Dimensions in mm

60 A

littelfuse.com

Blade / Automotive Fuses

Used with ATO Fuse 1 to 20 A or
25 A and 30 A. Supplied with
two 4” (102mm) wire leads.

Section Overview
Littelfuse is your source for a fast replacement of E- and R-rated
medium voltage fuses. Our emergency service gets you the fuses
you need quickly to minimize downtime of your critical operations.

MEDIUM VOLTAGE FUSES
Table of Contents
Medium Voltage Fuses Overview............................................... 39
R-Rated Medium Voltage Fuses.................................................. 40
E-Rated Medium Voltage Fuses.................................................. 42
Medium Voltage Live Parts.......................................................... 48

littelfuse.com

38

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Medium Voltage

MEDIUM VOLTAGE FUSES
2,400-38,000 Vac • Current-Limiting
Current-limiting E- and R-rated
fuses are equipped with a
mechanical indicator or striker pin
that protrudes through the fuse
cap upon operation of the fuse.
This provides visual identification
of a blown fuse and can be used
as a trigger for external devices.
Note: Extension distance 1/2” minimum;
extension force 2 lb. minimum.

The terms “Medium Voltage” and “High Voltage” have been
used interchangeably by many people to describe fuses
operating above 600 volts. Technically speaking, medium
voltage fuses are those intended for the voltage range from
2,400 to 38,000 Vac. High voltage fuses are for circuits
­carrying voltages greater than 38,000 Vac.
E-rated fuses are considered to be general purpose fuses
and can be used to protect against low and high values
of fault current. R-rated fuses are designed for back-up
protection. They must be used in series with other devices
such as motor overload relays in order to achieve both
overload and short-circuit protection.

Description
Littelfuse® offers a selection of E- and R-rated medium
voltage fuses for the protection of trans­formers, potential
transformers, feeders, and motor circuits. Single, double,
and triple barrel designs are available to cover a wide range
of current, voltage, and interrupting ­ratings. Conventional
ferrule type, clip lock, and bolt-in mounting configurations
are available for virtually any application. Hermetically sealed
fuses for use in hazardous environments are also offered.

Medium voltage fuses are not intended to provide overload
protection in the same sense as fuses rated 600 volts or
less. Medium voltage fuse current ratings do not have the
same meanings as the ampere ratings of low voltage fuses.
All medium voltage fuses are limited in their ability to
interrupt low value overcurrents, especially those between
100% and 200% of the fuse’s continuous current rating.
They are designed to carry their rated current without
exceeding the temperature rise permitted by NEMA and
ANSI standards.

Contact the factory or your local Littelfuse representative for
additional fuse ratings or custom mounting configurations.
24-Hour Emergency Service - Call 800-227-0029

Applications
•	 Power Transformer Protection
•	 Potential Transformer Protection
•	 Motor Controller Back-up Protection
•	 Fused Switches
•	 Feeder Circuits

Bolt-in Mount Fuses

© 2014 Littelfuse POWR-GARD® Products Catalog

39

littelfuse.com

Medium Voltage Fuses

General Information

3

Fuses – Medium Voltage

R-RATED MEDIUM VOLTAGE FUSES

Medium Voltage Fuses

3

Description

Characteristics

R-rated fuses provide required short-circuit protection for
medium voltage motors, motor controllers and associated
circuitry. These components have limited ability to absorb the
energy of large short-circuit currents. Medium voltage motor
controllers contain overload relays which provide both overload
protection and locked rotor protection to the motor. The
controllers are also intended to interrupt low value short-circuits
within the capability of the motor controller. This protects the
medium voltage fuse from sustained overcurrents which are
less than their minimum interrupting rating.

Voltage Ratings	
Current Range	

2,750 V – 8,250 V
2R – 36R

Options
•	 Hermetically

sealed for use in hazardous locations
(add “S” suffix to part number)
•	 Bolt-in mounting configurations

Hookeye Feature*

NEMA Standards for R-rated medium voltage power fuses
require they operate within 15-35 seconds when subjected
to an rms current 100 times the R rating. For example, a
fuse with a 2R rating will open within 15 to 35 seconds on
an applied current of 2 x 100 = 200 amperes.

For hookeye attachment; add “W” suffix
to part number

Ordering Number

130-4R-1C-5.5

*See web for Bolt Mount, Inverted Bolt Mount, and Bolt-In dimensions

Max Voltage (KV)
Style:
C (Cartridge)
B (Bolt Mount)
IB (Inverted Bolt Mount)
BI (Bolt-In Mount)

No. of Barrels
Rating (size)
Continuous Current

Dimensions
6.38"

3"DIA

Dim.A
Clip
Center

Medium Voltage
Fuse Protection
POWR-GARD® medium
voltage fuses provide
short-circuit protection
for motors and
transformers rated
2,400 to 38,000 volts AC.
Visit littelfuse.com/MediumVoltage to
download the white paper featuring protection
tables, sizing recommendations, and applications.

9.75"

Dim.B

Figure
D 1

Figure
DD 2

Cartridge “C”

Figure
DDD 3

A

littelfuse.com

Bolt Mount “B”

Inverted-Bolt “IB”

Bolt-In Mount “BI”

Sample Part #: 130-4R-1B-5.5

Sample Part #: 130-4R-1IB-5.5

Sample Part #: 130-4R-1BI-5.5

40

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Medium Voltage

ORDERING/
CATALOG
NUMBER

SIZE

2.75 KV

702R1C2.75
1003R1C2.75
1304R1C2.75
1505R1C2.75
1706R1C2.75
2009R1C2.75
23012R1C2.75
39018R2C2.75
45024R2C2.75

2R
3R
4R
5R
6R
9R
12R
18R
24R

R
RATED

ORDERING/
CATALOG
NUMBER

SIZE

5.5 KV

702R1C5.5
1003R1C5.5
1304R1C5.5
1505R1C5.5
1706R1C5.5
2009R1C5.5
23012R1C5.5
39018R2C5.5
45024R2C5.5
48026R2C5.5
55030R2C5.5
60032R2C5.5
65036R2C5.5
55030R3C5.5
60032R3C5.5
65036R3C5.5

2R
3R
4R
5R
6R
9R
12R
18R
24R
26R
30R
32R
36R
30R
32R
36R

R
RATED

ORDERING/
CATALOG
NUMBER

SIZE

5.5 KV
14”CLIP CENTERS

702R1C5.5X
1003R1C5.5X
1304R1C5.5X
1505R1C5.5X
1706R1C5.5X
2009R1C5.5X
23012R1C5.5X
39018R2C5.5X
45024R2C5.5X
55030R2C5.5X

2R
3R
4R
5R
6R
9R
12R
18R
24R
30R

R
RATED

ORDERING/
CATALOG
NUMBER

SIZE

702R1C8.25
1003R1C8.25
1304R1C8.25
1505R1C8.25
1706R1C8.25
2009R1C8.25
23012R1C8.25
39018R2C8.25
45024R2C8.25

2R
3R
4R
5R
6R
9R
12R
18R
24R

MAXIMUM
CONTINUOUS
CURRENT @
40 DEGREES C°
70
100
130
150
170
200
230
390
450
MAXIMUM
CONTINUOUS
CURRENT @
40 DEGREES C°
70
100
130
150
170
200
230
390
450
480
550
600
650
550
600
650
MAXIMUM
CONTINUOUS
CURRENT @
40 DEGREES C°
70
100
130
150
170
200
230
390
450
550
MAXIMUM
CONTINUOUS
CURRENT @
40 DEGREES C°
70
100
130
150
170
200
230
390
450

DIM. A
(INCHES)

DIM. B
(INCHES)

7"
7"
7"
7"
7"
7"
7"
7"
7"

10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"

DIM. A
(INCHES)

DIM. B
(INCHES)

12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"

15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"

DIM. A
(INCHES)

DIM. B
(INCHES)

14"
14"
14"
14"
14"
14"
14"
14"
14"
14”

17.875"
17.875"
17.875"
17.875"
17.875"
17.875"
17.875"
17.875"
17.875"
17.875”

DIM. A
(INCHES)

DIM. B
(INCHES)

12"
12"
12"
12"
12"
12"
12"
12"
12"

15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"

MINIMUM
INTERRUPTING
RATING RMS
AMPS
170
250
340
390
500
760
1000
1500
1950

MAXIMUM
INTERRUPTING
RATING RMS
(ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

MINIMUM
INTERRUPTING
RATING RMS
AMPS
170
250
340
390
500
760
1000
1500
1950
2100
2400
2600
2900
2400
2600
2900

MAXIMUM
INTERRUPTING
RATING RMS
(ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

MINIMUM
INTERRUPTING
RATING RMS
AMPS
170
250
340
390
500
760
1000
1500
1950
2400

MAXIMUM
INTERRUPTING
RATING RMS
(ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

MINIMUM
INTERRUPTING
RATING RMS
AMPS
190
225
330
440
500
740
955
1440
1910

MAXIMUM
INTERRUPTING
RATING RMS
(ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

FIGURE
NUMBER
1
1
1
1
1
1
1
2
2
FIGURE
NUMBER
1
1
1
1
1
1
1
2
2
2
2
2
2
3
3
3
FIGURE
NUMBER
1
1
1
1
1
1
1
2
2
2
FIGURE
NUMBER
1
1
1
1
1
1
1
2
2

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6
For hookeye attachment add “W” suffix to part number

© 2014 Littelfuse POWR-GARD® Products Catalog

41

littelfuse.com

3
Medium Voltage Fuses

R
RATED

8.25 KV

R-RATED MEDIUM VOLTAGE FUSES

Fuses – Medium Voltage

E-RATED MEDIUM VOLTAGE FUSES

Characteristics

E-rated fuses have time current characteristics designed to
provide current-limiting protection for power transformers,
potential transformers, power centers, feeder centers, and
unit sub stations. When properly applied, they can protect
against high and low fault currents.

Voltage Ratings	
Current Range	

2,750 V – 38,000 V
10E – 600E

Options
•	 Hermetically sealed for use in hazardous locations 
(add “S” suffix to part number)

NEMA Standards for E-rated medium voltage fuses require
that fuses rated 100E or less open within 300 seconds
(5 minutes) when subjected to an RMS value of 200-240%
of the fuse continuous current rating; and fuses with an
E rating larger than 100E must open within 600 seconds
(10 minutes) when subjected to an RMS current of 220240% of the fuse’s continuous current rating. These values
establish one point on the time-current curve.

•	 Clip-lock (CL) available.

Dimensions
6.38"

3"DIA

9.75"

Application Note
Since these fuses are used for the protection of general
­purpose circuits which may contain transformers, motors,
and other equipment producing in-rush and/or overload
currents, fuses should generally be rated at 140% of the
­normal full load current, and circuits should be analyzed
to ensure that system load currents will not exceed the
current rating of the fuse.

Dim.A
Clip
Center

Dim.B

Figure
D4

Figure
DD 5

A

Figure
DDD 6

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE
NUMBER

2.75 MAX. KV

Medium Voltage Fuses

3

Description

10E1C2.75
15E1C2.75
20E1C2.75
25E1C2.75
30E1C2.75
40E1C2.75
50E1C2.75
65E1C2.75
80E1C2.75
100E-1C2.75
125E1C2.75
150E1C2.75
200E1C2.75
125E2C2.75
150E2C2.75
200E2C2.75
250E2C2.75
300E2C2.75
350E2C2.75
400E2C2.75
450E2C2.75

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
200E
125E
150E
200E
250E
300E
350E
400E
450E

7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"
7"

10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"
10.875"

80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

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42

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Fuses – Medium Voltage

ORDERING/CATALOG
NUMBER

SIZE

5.5 MAX. KV

10E1C5.5
15E1C5.5
20E1C5.5
25E1C5.5
30E1C5.5
40E1C5.5
50E1C5.5
65E1C5.5
80E1C5.5
100E1C5.5
125E1C5.5
150E1C5.5
175E1C5.5
200E1C5.5
125E2C5.5
150E2C5.5
175E2C5.5
200E2C5.5
250E2C5.5
300E2C5.5
350E2C5.5
400E2C5.5
450E2C5.5
500E3C5.5
550E3C5.5
600E3C5.5

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
175E
200E
125E
150E
175E
200E
250E
300E
350E
400E
450E
500E
550E
600E

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

5NLE10E
5NLE15E
5NLE20E
5NLE25E
5NLE30E
5NLE40E
5NLE50E
5NLE65E
5NLE80E
5NLE100E
5NLE125E
5NLE150E
5NLE175E
5NLE200E
5NLE2225E
5NLE2250E
5NLE2300E
5NLE2350E
5NLE2400E
5NLE2450E

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
175E
200E
225E
250E
300E
350E
400E
450E

DIM. A (INCHES) DIM. B (INCHES)
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"

15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"
15.875"

DIM. A (INCHES) DIM. B (INCHES)
14”
14”
14”
14”
14”
14”
14”
14”
14”
14”
14“
14”
14”
14”
14”
14”
14”
14”
14”
14”

17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE NUMBER

80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
6
6
6

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE NUMBER

80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

© 2014 Littelfuse POWR-GARD® Products Catalog

43

littelfuse.com

3
Medium Voltage Fuses

E-RATED

5.5 MAX. KV

E-RATED MEDIUM VOLTAGE FUSES

Fuses – Medium Voltage

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

8.25 MAX. KV

10E1C8.25
15E1C8.25
20E1C8.25
25E1C8.25
30E1C8.25
40E1C8.25
50E1C8.25
65E1C8.25
80E1C8.25
100E1C8.25
125E1C8.25
150E1C8.25
125E2C8.25
150E2C8.25
200E2C8.25
250E2C8.25
300E2C8.25
350E3C8.25
400E3C8.25

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
125E
150E
200E
250E
300E
350E
400E

12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"
12"

15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"
15 7⁄8"

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

8.25 MAX. KV

Medium Voltage Fuses

3

E-RATED

8NLE10E
8NLE15E
8NLE20E
8NLE25E
8NLE30E
8NLE40E
8NLE50E
8NLE65E
8NLE80E
8NLE100E
8NLE2100E
8NLE2125E
8NLE2150E
8NLE2200E
8NLE2250E

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
100E
125E
150E
200E
250E

14"
14"
14"
14"
14"
14"
14"
14"
14"
14"
14"
14"
14"
14"
14"

17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"
17 7⁄8"

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

15.5 MAX. KV

E-RATED MEDIUM VOLTAGE FUSES

10E1C15.5
15E1C15.5
20E1C15.5
25E1C15.5
30E1C15.5
40E1C15.5
50E1C15.5
65E1C15.5
80E1C15.5
100E1C15.5
65E2C15.5
80E2C15.5
100E2C15.5
125E2C15.5
150E2C15.5
175E2C15.5
200E2C15.5
200E3C15.5
250E3C15.5
300E3C15.5

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
65E
80E
100E
125E
150E
175E
200E
200E
250E
300E

15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"
15"

18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"
18.875"

MAX INTERRUPTING
RATING RMS (ASYM)* FIGURE NUMBER
80,000,
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
6
6

MAX INTERRUPTING
RATING RMS (ASYM)* FIGURE NUMBER
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
5
5
5
5
5

MAX INTERRUPTING
RATING RMS (ASYM)* FIGURE NUMBER
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
6
6
6

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

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© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Medium Voltage

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE
NUMBER

15.5 MAX. KV

15GSE65E
15GSE80E
15GSE100E
15GSE2125E
15GSE2150E
15GSE2175E
15GSE2200E

65E
80E
100E
125E
150E
175E
200E

18"
18"
18"
18"
18"
18"
18"

21 7⁄8"
21 7⁄8"
21 7⁄8"
21 7⁄8"
21 7⁄8"
21 7⁄8"
21 7⁄8"

60,000
60,000
60,000
60,000
60,000
60,000
60,000

4
4
4
5
5
5
5

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE
NUMBER

15.5 MAX. KV

15NLE10E
15NLE15E
15NLE20E
15NLE25E
15NLE30E
15NLE40E
15NLE50E
15NLE65E
15NLE80E
15NLE100E
15NLE280E
15NLE2100E
15NLE2125E
15NLE2150E
15NLE2175E
15NLE2200E
15NLE3150E
15NLE3175E
15NLE3250E
15NLE3300E

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
80E
100E
125E
150E
175E
200E
150E
175E
250E
300E

20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"
20"

23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"
23 7⁄ 8"

60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000

4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
6
6
6
6

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE
NUMBER

25.8 MAX. KV

15E1C25.8
20E1C25.8
25E1C25.8
30E1C25.8
40E1C25.8
50E1C25.8
65E2C25.8
80E2C25.8
100E2C25.8

15E
20E
25E
30E
40E
50E
65E
80E
100E

21"
21"
21"
21"
21"
21"
21"
21"
21"

24 7⁄8"
24 7⁄8”
24 7⁄8”
24 7⁄8”
24 7⁄8”
24 7⁄8”
24 7⁄8”
24 7⁄8”
24 7⁄8”

40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000
40,000

4
4
4
4
4
4
5
5
5

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

FIGURE
NUMBER

3E1C38.0
7E1C38.0
10E1C38.0
15E1C38.0
20E1C38.0
25E1C38.0
30E1C38.0
40E1C38.0
50E2C38.0
65E2C38.0
80E2C38.0

3E
7E
10E
15E
20E
25E
30E
40E
50E
65E
80E

27"
27"
27"
27"
27"
27"
27"
27"
27"
27"
27"

30 7⁄8"
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”
30 7⁄8”

20,000
20,000
20,000
20,000
20,000
20,000
20,000
20,000
20,000
20,000
20,000

4
4
4
4
4
4
4
4
5
5
5

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

© 2014 Littelfuse POWR-GARD® Products Catalog

45

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3
Medium Voltage Fuses

E-RATED

38 MAX. KV

E-RATED MEDIUM VOLTAGE FUSES

Fuses – Medium Voltage

E-RATED MEDIUM VOLTAGE FUSES
4.31

A B

The clip lock type designs ensures a positive contact between
the fuse and the connection cam. The fuse’s clip lock tab slides
in between the clip casting and the cam to prevent the fuse
from slipping or blowing out of the holder. This positive contact
improves heat dissipation and allows fuses to run cooler.

5.5 MAX. KV
CLIP LOCK
8.25 MAX. KV
CLIP LOCK

E-RATED

E-RATED

15.5 MAX. KV
CLIP LOCK

Medium Voltage Fuses

3

11.56

1.25

Clip Lock Design

E-RATED

7.94

.25
1.25
3.0

Figure 7

Figure 8

Figure 9
Dimensions in inches

ORDERING/CATALOG
NUMBER
10E1CL5.5
15E1CL5.5
20E1C5.5
25E1CL5.5
30E1CL5.5
40E1CL5.5
50E1CL5.5
65E1CL5.5
80E1CL5.5
100E1CL5.5
125E1CL5.5
150E1CL5.5
225E2CL5.5
250E2CL5.5
300E2CL5.5
350E2CL5.5
400E2CL5.5
450E2CL5.5
500E3CL5.5
550E3CL5.5
600E3CL5.5
ORDERING/CATALOG
NUMBER
10E1CL8.25
15E1CL8.25
20E1C8.25
25E1CL8.25
30E1CL8.25
40E1CL8.25
50E1CL8.25
65E1CL8.25
80E1CL8.25
100E1CL8.25
125E2CL8.25
150E2CL8.25
175E2CL8.25
200E2CL8.25
225E2CL8.25
250E2CL8.25
300E2CL8.25
350E3CL8.25

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
225E
250E
300E
350E
400E
450E
500E
550E
600E

16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
16.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"

15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
15.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
175E
200E
225E
250E
300E
350E

17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"
17.38"

16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"
16.13"

ORDERING/CATALOG
NUMBER
10E1CL15.5
15E1CL15.5
20E1CL15.5
25E1CL15.5
30E1CL15.5
40E1CL15.5
50E1CL15.5
65E1CL15.5
80E1CL15.5
100E1CL15.5
125E2CL15.5
150E2CL15.5
175E2CL15.5
200E2CL15.5
150E3CL15.5
200E3CL15.5
250E3CL15.5
300E3CL15.5

SIZE

DIM. A (INCHES)

DIM. B (INCHES)

10E
15E
20E
25E
30E
40E
50E
65E
80E
100E
125E
150E
175E
200E
150E
200E
250E
300E

19.8"
19.8"
19.8"
19.8"
19.8"
19.8"
19.8"
22.81"
22.81"
22.81"
22.81"
22.81”
22.81"
22.81”
22.81"
22.81"
22.81"
22.81"

18.1"
18.1"
18.1"
18.1"
18.1"
18.1"
18.1"
21.13"
21.13"
21.13"
21.13”
21.13”
21.13”
21.13”
21.13”
21.13”
21.13”
21.13”

MAX INTERRUPTING
RATING RMS (ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
MAX INTERRUPTING
RATING RMS (ASYM)*
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000
80,000

FIGURE
NUMBER
7
7
7
7
7
7
7
7
7
7
7
7
8
8
8
8
8
8
9
9
9
FIGURE
NUMBER
7
7
7
7
7
7
7
7
7
7
8
8
8
8
8
8
8
9

MAX INTERRUPTING
RATING RMS (ASYM)*
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000
60,000

FIGURE
NUMBER
7
7
7
7
7
7
7
7
7
7
8
8
8
8
9
9
9
9

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

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© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Medium Voltage

E-RATED POTENTIAL TRANSFORMER FUSES

Description

Characteristics

Potential Transformer (PT) fuses are current-limiting fuses
with high interrupting ratings designed for the protection of
potential transformers.

Voltage Ratings	
Current Range	

Application Note

Dimensions

625 Vac – 25,800 Vac
1/2E – 10E

When applying fuses for the protection of transformers,
the magnetizing current in-rush must be considered. The
characteristics of the in-rush, which can be matched with
a fuse time-current curve, should be available from the
­transformer manufacturer.

B

25.8
MAX.
KV

15.5
MAX. KV

8.25
MAX.
KV

5.5
MAX. KV

4.8
MAX.
KV

2.75
MAX. KV

2.75
MAX.
KV

625
VOLT

E-RATED

ORDERING/CATALOG
NUMBER

SIZE

LENGTH DIM. A
(INCHES)

DIAMETER DIM. B
(INCHES)

MAX INTERRUPTING
RATING RMS (ASYM)*

3E4PT.6
5E4PT.6
7E4PT.6
10E4PT.6
500E4PT2.4
1E4PT2.4
2E4PT2.4
1E6PT2.75
2E6PT2.75
3E6PT2.75
1E8PT2.75
2E8PT2.75
3E8PT2.75
1E5PT4.8
2E5PT4.8
500E6PT5.5
1E6PT5.5
2E6PT5.5
3E6PT5.5
5E6PT5.5
500E8PT5.5
1E8PT5.5
2E8PT5.5
3E8PT5.5
5E8PT5.5
10E8PT5.5
500E8PT8.25
1E8PT8.25
2E8PT8.25
3E8PT8.25
500E11PT15.5
1E11PT15.5
2E11PT15.5
3E11PT15.5
3E16PT15.5
5E16PT15.5
500E16PT25.5
1E16PT25.5

3E
5E
7E
10E
1/2E
1E
2E
1E
2E
3E
1E
2E
3E
1E
2E
1/2E
1E
2E
3E
5E
1/2E
1E
2E
3E
5E
10E
1/2E
1E
2E
3
1/2E
1E
2E
3E
3E
5E
1/2E
1E

4.6”
4.6”
4.6”
4.6”
4.6”
4.6”
4.6”
7.4”
7.4”
7.4”
9.5”
9.5”
9.5”
5.6”
5.6”
7.4”
7.4”
7.4”
7.4”
7.4”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
12.8”
12.8”
12.8”
12.8”
17.5”
17.5”
17.5”
17.5”

0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
0.8125”
0.8125”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”

37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
35,000
35,000
35,000
35,000
35,000
35,000
32,000
32,000

* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6

© 2014 Littelfuse POWR-GARD® Products Catalog

47

littelfuse.com

Medium Voltage Fuses

A

3

Fuses – Medium Voltage

LIVE PARTS

Description
Live parts are available for mounting E, R, and PT ­single, double, and triple barrel
fuses. Mounting clips are available for ferrule type and clip lock style fuses.
All clips are sold in pairs.

Medium Voltage Fuses

3

Part Number 700-156

Part Number 700-300

Ordering Number 0700156.Z

Ordering Number 0700300.Z

For use with 19/16" (1.5625”) to 15/8” (1.625”) diameter PT fuses.

For use with 3” diameter fuses.
2.00
1.00

3.74

2.85

Dimensions in inches

Part Number 700-500

Part Number 700-530

Ordering Number 0700500.Z

Ordering Number 0700530.Z

For use with all 13/16" (.8125”) diameter PT fuses
.78
.08
1.15

.71
.30

For use with all 3" diameter fuses.
.08

0.38" HOLES
1.50

.05

4.50
3.08

.31
Dimensions in inches

Mounting Hole
Dimension

4.16

.78

.63

Part Number 700-520-CL
Ordering Number 0700520.ZXCL
Clip Lock Design

Mounting Details for Clip Lock
CATALOG NUMBER
10E1CL5.5 thru 150E1CL5.5
225E2CL5.5 thru 600E3CL5.5
10E1CL8.25 thru 350E3CL8.25
10E1CL15.5 thru 50E1CL15.5
65E1CL15.5 thru 300E3CL15.5

DIMENSION A (INCHES)
12.88
13.88
13.88
16.25
19.25

3.63

TRIPLE BARREL

3.63

DOUBLE BARREL

4.85

SINGLE BARREL
1.75

Blown Fuse
Indicator
2.00
4.9

Dimensions for reference only.

littelfuse.com

Bottom Lever In
Closed Position

TOP
VIEW

48

3.75 2.00
Top Lever in
Open Position

A

1.00
2.00

.56 Dia. (2) Holes
For Mounting
Cable/Bus

.44 DIA. (2) HOLES

© 2014 Littelfuse POWR-GARD® Products Catalog

Section Overview
Rely on Littelfuse for short circuit protection of telecommunications
circuits and sensitive DC power distribution circuits.

3
Medium Voltage Fuses

TELECOM PRODUCTS
Table of Contents
L17T Series Telecommunications Power Fuse............................ 50
TLN Series Telecommunications Power Fuse..............................51
TLS Series Telecommunications Power Fuse............................. 52
Alarm Indicating Fuses................................................................. 53
LTFD101 Telecommunication Disconnect Switch....................... 54

© 2014 Littelfuse POWR-GARD® Products Catalog

49

littelfuse.com

Fuses – Telecom Products

L17T SERIES TELECOM POWER FUSE
170 Vdc • Current-Limiting • 70 -1200 A

Ordering Information
70
90
100

Telecom Products

4

AMPERE RATINGS
200
300
450
225
350
500
250
400
600

125
150
175

SERIES

VOLTAGE

AMPERAGE

L17T

170

1200

800
900
1000

CATALOG
NUMBER
L17T 1200

1100
1200
—
ORDERING
NUMBER
L17T1200V

Dimensions Inches (mm)

Description

F

Specifically designed for short-circuit protection of
telecommunications circuits, the Littelfuse L17T
series fuses provide reliable protection of sensitive
DC power distribution systems. Constructed with
silver plated elements for low I2t and peak let-through,
these advanced fuses virtually eliminate equipment
damage due to surges and spikes. The L17T series
fuse unique element geometry also provides
cooler running temperatures, helping to minimize
heat within enclosures.

AMPERE
RATING

Features

•	 Low operating temperature
•	 170 Vdc rating

Specifications

Fig. 3

DIMENSIONS INCHES (mm)
C
D
E
F

B

G

H

70 – 250

1 5 ⁄ 32
(29.4)

1 7⁄ 8
(47.6)

2 3 ⁄16
(55.6)

2­ 21 ⁄ 32
(67.5)

1
(25.4)

78

⁄
(22.2)

5 16

⁄
(7.9)

⁄
(4.8)

300 – 800

11⁄4
(31.8)

115 ⁄16
(49.2)

2 9 ⁄16
(65.1)

3 1⁄2
(88.9)

11⁄2
(38.1)

1
(25.4)

13 32
⁄
(10.3)

14
⁄
(6.35)

900–1200

111 ⁄ 32
(34.0)

­—

­—

4 1⁄16
2
(103.1) (50.8)

11⁄2
(38.1)

—

14
⁄
(6.35)

3 16

Web Resources

Voltage Rating		
170 Vdc
Interrupting Rating		
100 kA
Ampere Range		
70 – 1200 A
Approvals		UL Recognized (File: E71611)
CSA Recognized (File: LR29862)

littelfuse.com

E

A

•	 Low I2t
•	 Extremely current-limiting

H

A
B
C
D

G

For additional information, visit:
littelfuse.com/l17t

50

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Telecom Products

TLN SERIES TELECOM POWER FUSE
170 Vdc • Current-Limiting • 1-600 A
Specifications
Voltage Rating		
170 Vdc
Interrupting Rating		
100 kA
Ampere Range		
1 – 600 A
Approvals		UL Recognized (File: E71611)

Ordering Information
1
3
5
6
10

AMPERE RATINGS
40
80
150
45
90
175
50
100
200
60
110
225
70
125
250

15
20
25
30
35

SERIES

VOLTAGE

AMP

TLN

170VDC

6

300
350
400
450
500

CATALOG
NUMBER
TLN006

600
—
—
—
—

ORDERING
NUMBER
0TLN006.T

Telecom Products

Replaces competitors’ TPN and TGN Series.

Description
The TLN Series fuses are specifically designed for
the protection of telecommunications DC power
distribution circuits.

Web Resources
For additional information, visit:
littelfuse.com/tln

Features
•	 170 Vdc rating

Recommended Fuse Holders

•	 Fast-acting and current-limiting

LFR25 Series....................................................................... 88

•	 1 to 600 amperes rating
•	 Dimensionally similar to 250 V Class R fuses

Dimensions Inches (mm)
F
G

A
D

B
E

H

C

FIGURE
NUMBER

1 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600

1
1
2
2
2
2

A
2 (50.8)
3 (76.2)
5 7⁄8 (149.2)
7 1⁄8 (181.0)
8 5 ⁄8 (219.1)
10 3 ⁄8 (263.5)

C
B

F

D

J

FIG. 2

FIG. 1
AMPERES

A

K

B
12
⁄ (12.7)
3 4
⁄ (19.1)
1 (25.4)
11⁄2 (38.1)
2 (50.8)
2 1⁄2 (63.5)

© 2014 Littelfuse POWR-GARD® Products Catalog

C
D
12
9 16
⁄ (12.7)
⁄ (14.3)
58
13 16
⁄ (15.9)
⁄ (20.6)
11 ⁄16 (27.0) 11 ⁄16 (27.0)
115 ⁄ 32 (37.3) 119 ⁄ 32 (40.5)
115 ⁄16 (49.2) 2 3 ⁄ 32 (53.2)
2 3 ⁄8 (60.3) 2 19 ⁄ 32 (65.9)

DIMENSIONS INCHES (mm)
E
F
G
5 64
5 32
3 8
⁄ (2.0)
⁄ (4.0)
⁄ (9.5)
3 32
3 16
5 8
⁄ (2.4)
⁄ (4.8)
⁄ (15.9)
18
3 4
⁄ (3.2)
⁄ (19.1)
11⁄4 (31.6)
3 16
⁄ (4.8)
1 1⁄8 (28.6) 1 27⁄ 32 (46.8)
14
⁄ (6.4)
15 ⁄8 (41.3) 2 11 ⁄ 32 (59.5)
14
⁄ (6.4)
2 (50.8)
2 27⁄ 32 (72.2)

51

4

H
—
—
14
⁄ (6.4)
7 16
⁄ (11.1)
5 8
⁄ (15.9)
3 4
⁄ (19.1)

J
—
—
9 32
⁄ (7.1)
9 32
⁄ (7.1)
13 32
⁄ (10.3)
17 32
⁄ (13.5)

K
—
—
12
⁄ (12.7)
11 16
⁄ (17.5)
15 16
⁄ (23.8)
11⁄8 (28.6)

littelfuse.com

Fuses – Telecom Products

TLS SERIES TELECOM POWER FUSE
170 Vdc • Current-Limiting • 1-125 A
Specifications
Voltage Rating	
Ampere Range	
Interrupting Rating	
Approvals	
Construction	
	
Environmental	

170 Vdc
1 – 125 A
100 kA
UL Recognized (File: E71611)
Body: Glass melamine
Caps: Silver-plated brass
RoHS Compliant, Lead (Pb) Free

Ordering Information

Telecom Products

4

1
2
3
5

Description

AMPERE RATINGS
25
30
35
40

6
10
15
20

50
60
70
80

90
100
110*
125*

*Available in cartridge only.
Note: To order leaded versions of TLS fuses, add suffix V, L, LB, or LS to part number.

Littelfuse TLS Series fuses are designed specifically for
the protection of telecommunications equipment. TLS
fuses have been engineered to operate up to 170 Vdc to
provide current-limiting short-circuit protection for cables
and components found in the DC power distribution circuits
of telecommunications systems. The compact design and
multiple mounting configurations of the TLS series allow it
to be used in a variety of applications.

SERIES

VOLTAGE

AMP

TLS

170VDC

6

CATALOG
NUMBER
TLS006V

ORDERING
NUMBER
0TLS006.TXV

Replaces competitors’ TPS and TGS Series.

Web Resources

Features

For additional information, visit: littelfuse.com/tls

•	 170 Vdc rating

Recommended Fuse Holders

LFT30060 for TLS series cartridge style fuse.......................94

•	 Current-limiting
•	 1 to 125 amperes rating
•	 Multiple mounting configurations
•	 RoHS Compliant

Dimensions Inches (mm)
TLS

TLS-V

TLS-L
.195
(4.95)

.37
(9.4)

.563
(14.3)

.877
(22.28)

TLS-LB

littelfuse.com

Vertical Mount

TLS-MB

.559
(14.20)

1.367
(34.72)

1.58
(40.13)

.944
(23.98)
.87
(22.28)

MB

1.74
(44.20)

.032
(.81)

.74
(18.8)

Cartridge

.382
(9.70)

1.74
(44.20)

1.26
(32.0)

TLS-LS

Leaded

Bolt-In

52

Solder

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Telecom Products

70 SERES & 481 SERIES ALARM INDICATING FUSESSES
Alarm Indicating Fuses
Ordering Information
100 mA
150 mA
180 mA

Description
The 70 Series alarm indicating fuses are designed for use in
telecommunications equipment. A color coded tip provides
visual identification of the ampere rating and the fuse status.

Features
•	 Color coded tip

CATALOG
NUMBER
70P
70R
70E
70X
70F
70K
70S
70G
70H
70A
70B
70C
70J
70D
70M
70N

2
3
3.5

ORDERING
NUMBER
70P00000Z
70R00000Z
70E00000Z
70X00000Z
70F00000Z
70K00000Z
70S00000Z
70G00000Z
70H00000Z
70A00000Z
70B00000Z
70C00000Z
70J00000Z
70D00000Z
70M00000Z
70N00000Z

5
8
10
COLOR
CODE
GREY/WHITE
RED/WHITE
YELLOW
BLACK
VIOLET
VIOLET/WHITE
GRAY
RED
BROWN
WHITE
ORANGE
BLUE
BLACK/WHITE
GREEN/BLACK
TAN/WHITE
YELLOW/PURPLE

•	 Rated 125 Vac, 300 Vdc

Web Resources

Specifications
Voltage Ratings	
Interrupting Ratings	
	

For additional information, visit: littelfuse.com/70

125 Vac/300 Vdc
1,000 A @ 125 Vac
1,000 A @ 300 Vdc

Specifications
Voltage Rating	
125 Vac/dc
Approvals	UL Recognized (File: E71611)
CSA Recognized (File: LR29862)

Ordering Information
/
1/5
1/4

18 100

481 Series Alarm Indicating Fuses

Description
481 Series alarm indicating fuses are designed to reduce
down time by immediately pinpointing the blown (open)
circuit while triggering an LED or audio alarm. This item
requires 482 Series mating fuse holder.

AMPERE RATINGS
/
1 1/2
3
1
2
3 1/2
1 1/3
2 1/2
4
3 4

SERIES

VOLTAGE

AMP

481

125 ac/dc

2

5
7 1/2
10

CATALOG
NUMBER
481002L

12
15
20

ORDERING
NUMBER
0481002.VXL

Note: For 481 Dummy fuse, order 481000.

Recommended Fuse Holders
482 Series, see website: littelfuse.com/482
Available 1-20 pole with PCB or panel mounting.
To order with protective lens add suffix XL.

All ranges of 481 Series fuses are available as our original
design, and the 2-20 amp range is now available as a RoHS
compliant option (use the “P” designator when ordering).
See the part numbering section of the datasheet for related
ordering instructions.
© 2014 Littelfuse POWR-GARD® Products Catalog

/
1/2
65/100
3 8

Web Resources
For additional information, visit: littelfuse.com/481
53

littelfuse.com

4
Telecom Products

10 MINUTE
RATING
100 mA
150 mA
180 mA
200 mA
250 mA
250 mA
350 mA
500 mA
750 mA
1.33 A
2A
3A
3.5 A
5A
8A
10 A

70 Series Alarm Indicating Fuses

AMPERE RATINGS
500 mA
750 mA
1.33

200 mA
250 mA
350 mA

Fuses – Telecom Products

LTFD 101 SERIES TELECOM DISCONNECT SWITCH
80 Vdc • 1-125 A

Specifications
Voltage Rating	
Ampere Range	
Approvals	

Telecom Products

4

80 Vdc
1­ – 125 A
UL Recognized (File: E122674)

Recommended Fuses
Littelfuse TLS Series fuses................................................. 52

Ordering Information
Description
Littelfuse compact LTFD 101 fuse holders for TLS fuses
are designed for quick installation into telecom equipment
panels. Their modular design fits into spaces originally
designed for circuit breakers and can be front panel
mounted or rear mounted using bullet connectors.
The innovative new pull-out design eliminates the
need for tools to replace fuses and includes an
alarm signaling circuit to identify the blown fuse.

125 A MAX

CATALOG
NUMBER
LTFD101-1

ORDERING
NUMBER
LTFD0101ZX1

TERMINAL
TYPE
BULLET

125 A MAX

LTFD101-2

LTFD0101ZX2

SCREW

125 A MAX

LTFD101-3

LTFD0101ZX3

STUD

70 A MAX

LTFD101-4

LTFD0101ZX4

CLIP

SERIES

AMPERAGE

LTFD
LTFD
LTFD
LTFD

Web Resources
For additional information, visit:
littelfuse.com/ltfd101

Features
•	 Extremely compact
•	 Quick mounting
•	 Replaces circuit breakers
•	 Includes alarm signaling circuit

Dimensions Inches (mm)
6-32 UNF Insert
0.20 ±.030 Deep

0.75"
(19.05)
CL

3.75"
(95.25)
2.00"
(50.8)

0.305" (7.747) Dia.
Bullet Terminal

0.85"
(21.59)
LOAD

2.50"
(63.5)
2.062"
(52.375)

1.940"
(49.276)

Alarm pin
0.02" (.508) x 0.11" (2.794)
position optional

LINE

Dimensions for reference only. For additional options and dimensions, contact the factory.

littelfuse.com

54

© 2014 Littelfuse POWR-GARD® Products Catalog

Section Overview
Whether you are protecting solar equipment or finding a
replacement fuse for an aging HVAC unit, Littelfuse carries the
breadth of fuses to meet your needs. Our “special purpose”
fuse section includes application-specific products to meet
all of your application needs.

SPECIAL PURPOSE FUSES
Table of Contents
Solar Rated Products Overview................................................... 56
1500 Vdc Solar Rated Fuses........................................................ 57
1000 Vdc Solar Rated Fuses........................................................ 59
Forklift / Stud Mounted Fuses..................................................... 62
Plug Fuses.................................................................................... 63
MEGA® Bolt-Down Fuses............................................................ 63

POWR-GARD® Circuit Protection
Littelfuse engineering is constantly
developing new products to meet the
needs of the photovoltaic industry. For
the latest information on the growing
POWR-GARD Product portfolio, visit:
littelfuse.com/solar

© 2014 Littelfuse POWR-GARD® Products Catalog

In-Line Fuses And Holder............................................................ 64
Cable Limiters.............................................................................. 65
Cylindrical Fuses.......................................................................... 66
OEM Custom Products................................................................ 67

55

littelfuse.com

Fuses – Solar

SOLAR PRODUCTS BY APPLICATION
1.	
2.	
3.	
4.	
5.	
6.	
7.	

SPXV 1500 V – 6-30 A Fuse
SPXI 1500 V – 2.5-3.5 A In-Line Fuse
SPFJ 1000 V – 70-450 A Fuse
SPF 1000 V – 1-30 A Fuse
SPFI 1000 V – 2-20 A In-Line Fuse
KLKD 600 V – 1/10-30 A Fuse
IDSR & LDC 600 V Fuse and Holder

8.	
9.	
10.	
11.	
12.	
13.	
14.	

LFJ1000 Fuse Block for SPFJ Fuse
LFPHV & LFPSM Touch-Safe Fuse Holder
Busbar for Touch-Safe Fuse Holders
Power Distribution Block
SE-601 DC Ground-Fault Relay
TVS Diodes / SCRs
Varistor Products

Solar Fuses

5
CENTRAL INVERTER
3
7

11

12

14

WIRE HARNESS
2
5

COMBINER BOX
1

4

6

9

10

11

littelfuse.com

MICRO INVERTER
13
14

SMALL INVERTER
1
4
6

9

13

56

14

COMMERCIAL INVERTER
4
1
3

9

11

14

ARRAY COMBINER
3

7

8

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Solar

SPXV SERIES SOLAR FUSES
1500 Vdc  •  6 - 30 A

Specifications

The Littelfuse SPXV solar string fuse is designed
specifically for 6-30 A 1500 Vdc applications.

Voltage Rating 	
Amperage Rating 	
Max. Interrupting Rating	
Time Constant	
Material 	
	
Approvals 	
	
Environmental 	
	
Country of Origin 	

Features/Benefits

Part Numbering System

Description

•	 10 x 85 mm package size
•	 UL 2579 Listed and IEC 60269-6
•	 30,000 A interrupting rating

1500 Vdc
6, 8, 10, 12, 15, 20, 25, 30
30 kA
≤ 1ms
Body: Melamine
Caps: Copper Alloy
UL 2579 Listed (File: E339112)
IEC 60269-6
RoHS Compliant
Reach Compliant
Mexico

5

SPXV xxx T

Amp Code

Applications

Package Quantity

Refer to datasheet
for amp code

•	 Inverters
•	 Combiner boxes

Recommended Fuse Holder
Littelfuse LPXV Solar Series...............................................106

Web Resources

T = 10
L = 50

SERIES

AMP

PACKAGE
QUANTITY

CATALOG
NUMBER

ORDERING
NUMBER

SPXV
SPXV

6
30

10
50

SPXV006
SPXV030

SPXV006.T
SPXV030.L

Download the complete datasheet and other technical
documents: littelfuse.com/spxv

Dimensions inches (mm)
6 – 20 A
.38
(9.6)

3.36
(85.3)

.41
(10.4)

2.55
(64.8)

ø .41
(10.4)

25 – 30 A
.50
(12.7)

3.36
(85.3)

© 2014 Littelfuse POWR-GARD® Products Catalog

2.56
(65.0)

.41
(10.4)

1.67
(42.4)

57

littelfuse.com

Solar Fuses

Series

Fuses – Solar

SPXI SERIES SOLAR FUSES
1500 Vdc • 2.5 - 3.5 A • Patent Pending

Specifications
Voltage Rating 	
1500 Vdc
Amperage Rating 	
2.5-3.5 A*
Interrupting Rating	
15 kA
Time Constant	
≤ 1ms
Material 	
Body: Melamine
	
Caps: Copper Alloy (Nickel Plated)
Approvals 	
UL 2579 Recognized (File: E339112)
Environmental 	
RoHS Compliant
Country of Origin 	
Mexico
*Visit littelfuse.com/solar for the newest available amperages

Description

Solar Fuses

5

The Littelfuse SPXI solar fuse is designed to integrate
into an in-line assembly within a wire harness. The fuse
provides photovoltaic (PV) protection that meets UL 2579 for
photovoltaic applications. The SPXI can be electrically insulated
by either overmolding or using approved heat-shrink.

Part Numbering System

Features/Benefits
•	
•	
•	
•	

SPXI xxx T

Meets UL 2579 photovoltaic specifications
Meets IEC 60269-6 electrical performance requirements
15,000 A interrupting rating
No fuse holder required

Series
Amp Code

Package Quantity

Refer to datasheet
for amp code

Applications

SERIES

•	 Photovoltaic wire harness

SPXI
SPXI

Recommended Crimping Tool

T = 10
L = 50

AMP PACK QUANTITY
2.5
3.5

10
50

CATALOG
NUMBER

ORDERING
NUMBER

SPXI02.5
SPXI03.5

SPXI02.5T
SPXI03.5L

T&B Sta-Kon ERG4002 or equivalent
Weidmüller HTN 21 or equivalent

Web Resources
Download the complete datasheet and other technical
documents: littelfuse.com/spxi

Dimensions mm (in)

10.31
(0.406)

ø 3.56
(0.140)

9.53
(0.375)

5.59
(0.220)

81.41
(3.205)

Look for this logo to indicate products that are used in solar applications. Visit our website
littelfuse.com/solar for the latest updates on approvals, certifications, and new products.
littelfuse.com

58

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Solar

SPFI SERIES SOLAR FUSES
1000 Vdc  •  2 - 20 A • Patent Pending

Specifications
Voltage Rating 	
1000 Vdc
Amperage Rating 	
2, 3, 3.5, 4, 5, 6, 8, 10, 12, 15, 20*
Max. Interrupting Rating	
20 kA
Time Constant	
≤ 1ms
Material 	
Body: Melamine
	
Caps: Copper Alloy (Nickel Plated)
Approvals 	
UL 2579 Recognized (File: E339112)
Environmental 	
RoHS Compliant
Country of Origin 	
Mexico
*Visit littelfuse.com/solar for the newest available amperages

Description
The Littelfuse SPFI solar fuse has been designed to
integrate into an in-line assembly within a wire harness.
The fuse provides photovoltaic (PV) protection is UL 2579
Recognized for photovoltaic applications. The SPFI can
be electrically insulated by either overmolding or using
approved heat-shrink.

Part Numbering System
Package Quantity

Series

•	 Meets UL 2579 photovoltaic specifications
•	 Meets IEC 60269-6 electrical performance requirements

T = 10
L = 50

Amp Code
Refer to datasheet
for amp code

•	 20,000 A interrupting rating
•	 No fuse holder required

Applications
•	 Photovoltaic wire harness

Recommended Crimping Tool

SERIES

AMP

PACKAGE
QUANTITY

CATALOG
NUMBER

ORDERING
NUMBER

SPFI
SPFI
SPFI

2
3.5
20

10
10
50

SPFI002
SPFI03.5
SPFI020

SPFI002.T
SPFI03.5T
SPFI020.L

T&B Sta-Kon ERG4002 or equivalent
Weidmüller HTN 21 or equivalent

Web Resources
Download the complete datasheet and other technical
documents: littelfuse.com/spfi

12.26
(0.483)
Typ. 2

ø 3.56
(0.140)

63.50
(2.50)
5.59
(0.22)
Typ. 2

10.31
(0.406)
Typ. 2

9.53
(0.375)
Typ. 2

Look for this logo to indicate products that are used in solar applications. Visit our website
littelfuse.com/solar for the latest updates on approvals, certifications, and new products.
© 2014 Littelfuse POWR-GARD® Products Catalog

59

littelfuse.com

Solar Fuses

SPFI xxx T

Features/Benefits

Dimensions mm (in)

5

Fuses – Solar

SPF SERIES SOLAR FUSES
1000 Vdc • 1-30 A

Specifications
Voltage Rating 	
1000 Vdc
Amperage Rating 	
1, 2, 3, 3.5, 4, 5, 6, 8, 10, 12, 15, 20, 25, 30
Max. Interrupting Rating	
20 kA
Time Constant	
≤ 2ms
Material 	
Body: Melamine
	
Caps: Copper Alloy
Approvals 	
UL 2579 Listed (File: E339112)
	
IEC 60269-6 (1-25 A)
	
VDE Certified (No. 40033098)
	
CSA Certified (File: 029862_0_000)
Environmental 	RoHS Compliant
Country of Origin 	Mexico

Description

Solar Fuses

5

The SPF Solar Protection Fuse series has been specifically
designed for the protection of photovoltaic (PV) systems.
This series of Midget style fuses (10 x 38 mm) can safely
protect PV modules and conductors from
reverse-overcurrent conditions.

Part Numbering System
0SPF xxxx H XR
Series

As PV systems have grown in size, so have the
corresponding voltage requirements. This increase in
system voltage has typically been intended to minimize
power loss associated with long conductor runs. Standard
circuit protection devices are not designed to completely
protect photovoltaic panels. However, the SPF series is
UL Listed to safely interrupt faulted circuits up to this
demanding voltage level.

Blank = Ferrule
XR = PCB

Amp Code

Refer to datasheet
for amp code

SERIES AMP
SPF
SPF
SPF

Features/Benefits
•	
•	
•	
•	
•	

Mounting Options

Meets UL, IEC and VDE photovoltaic standards
UL 2579 Listed 1000 Vdc maximum
1-30 A ratings available
20,000 A Interrupting Rating
Both PCB mount and dead-front holder options available

2
3.5
30

Package Quantity
T = 10
H = 100

PACKAGE
QUANTITY

MOUNTING
METHOD

CATALOG
NUMBER

ORDERING
NUMBER

10
10
100

FERRULE
FERRULE
PCB TABS

SPF002
SPF03.5
SPF030R

0SPF002.T
0SPF03.5T
0SPF030.HXR

Dimensions Inches (mm)
Ferrule Version

PCB Version

Applications

.06 (1.52)
.02 (.51)

•	 Inverters
•	 Combiner boxes
•	 Battery charge controllers

.14
(3.56)
.04
(1.02)

Recommended Fuse Holders

1.5 (38.1)

1.53
(38.86)

Littelfuse LFPHV Series.................................................... 109

Web Resources
Download the complete datasheet and other technical
documents: littelfuse.com/spf
MOUNTING HOLE
.406
(10.31)

.50 (12.7)

.12 (3.05)

DETAIL

.12 .28
(3.05) (7.11) .406 (10.31)

littelfuse.com

60

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Solar

SPFJ SERIES SOLAR FUSES
1000 Vdc  •  70-450 A

Specifications
Voltage Rating	
	
Amperage Rating	
	
Interrupting Rating	
	

1000 Vdc
600 Vac (125-450 A)
70, 80, 90, 100, 125, 160, 200,
250, 300, 350, 400, 450
AC: 200 kAIC (125-450 A)
DC: 70-200 A: 20 kAIC
250-400 A: 10 kAIC
450 A: 20 kAIC
Time Constant	
≤ 1ms
Material	
Body: Melamine
	
End Bells: Copper Alloy
Approvals	
UL 2579 Listed (File: E339112)
	
UL 248-8, Class J (125-450 A)
	
C UL (125-450 A)
	
IEC 60269-6 (125-450 A)
	
VDE Certified (125-450 A)
	
(No. 40033659, 40033660, 40033661)
Environmental	
RoHS Compliant
Country of Origin	Mexico

Description
The SPFJ series is the smallest 1000 Vdc 70-450 A
photovoltaic fuse available in the market. The SPFJ series is
manufactured in Class J case sizes that allows for both fuse
holder and busbar mounting configuration. The SPFJ meets
both UL and IEC requirements.

SPFJ xxx X —

Meets UL and IEC photovoltaic standards
VDE certified specifications
Small footprint reduces panel size
Flexibility of fuse holder or busbar mounting
Higher amperage solar fuses in standard sizes
UL Listed branch and feeder circuit rated
Class J case sizes for the 70-450 A ratings

Series
Amp Code

Mounting Options
Blank = Class J
XL = 8.5mm opening

Refer to datasheet
for amp code

Package Quantity
X=1

SERIES AMP

Applications

SPFJ
SPFJ

•	 Inverters
•	 Re-combiner boxes

PACKAGE
QUANTITY

MOUNTING
METHOD

CATALOG
NUMBER

ORDERING
NUMBER

1
1

CLASS J
LARGE

SPFJ070
SPFJ200

SPFJ070.X
SPFJ200.XXL

70
200

Dimensions Inches (mm)

Recommended Fuse Holders
Littelfuse LFJ1000 Solar Series..........................................107

Web Resources

F

Download the complete datasheet and other technical
documents: littelfuse.com/spfj

E
G

A
D

B
C
AMPERAGE
70-100
125-200
250-400
450

DIMENSIONS IN INCHES (MM)
A
3.02 (76.5)
3.02 (76.5)
3 .37 (85.7)
3.75 (95.3)

B
4.38 (111.3)
4.38 (111.3)
5.25 (133.4)
5.98 (152.0)

C
5.75 (146.1)
5.75 (146.1)
7.125 (181.0)
8.0 (203.2)

D
1.5 (38.1)
1.5 (38.1)
2.0 (50.8)
2.5 (63.5)

E
1.125 (28.3)
1.125 (28.3)
1.63 (41.3)
2.0 (50.8)

F
.335 (8.5)
.281 (7.1)*
.406 (10.3)
.531 (13.5)

G
.189 (4.8)
.189 (4.8)
.252 (6.4)
.374 (9.5)

* SPFJ L option = 8.5 mm (UL 2579 approval only)

© 2014 Littelfuse POWR-GARD® Products Catalog

61

littelfuse.com

Solar Fuses

Part Numbering System

Features/Benefits
•	
•	
•	
•	
•	
•	
•	

5

Fuses — Special Purpose

FORK-LIFT STUD-MOUNTED FUSES
32/48/80 Vdc • Fast-Acting and Very Fast-Acting • 35-800 A
Ordering Information
AMPERE RATINGS CNN_E & CNN
10†
35
40
50

60
80
90
100

125
150
175
200

225
250
275
300

325
350
400
500

600
700
800
—

CNN Series only

†

AMPERE RATINGS CNL (32 Vdc)
35
40
50
60

CNN_E, CNN & CNL Limiter Fuses

Description
CNN_E fuses are rated for applications up to 80 Vdc.
As fork lift trucks and electrical vehicle system voltages
increase, circuit protection needs to be rated higher than the
standard CNN products to handle the increased voltage. The
CNN_E is considered very fast-acting for quicker reaction time.

Special Purpose Fuses

5

Specifications

SERIES

80
100
125
130

150
175
200
225

TYPE

250
275
300
325

350
400
500
—

VOLT
DC

AMP

CATALOG
NUMBER

ORDERING
NUMBER

80
48
32

200
125
50

CNN200E
CNN125
CNL050

0CNN200E.V
0CNN125.V
0CNL050.V

CNN_E VERY-FAST-ACTING
CNN VERY FAST-ACTING
CNL
FAST-ACTING

Recommended Fuse Holders

LFFB0003Z........................................................................118

Voltage Ratings	
	
	
Ampere Ratings	
Max. Interrupting Rating	
Approval	
Environmental	
Country of Origin	

Web Resources

CNN_E: 80 Vdc / 125 Vac
CNN: 48 Vdc / 125 Vac
CNL: 32 Vdc / 32 Vac
10 – 800 A*
2,500 A
UL Recognized (File: E71611)
RoHS Compliant, Lead (Pb) Free
Mexico (CNN_E only)

littelfuse.com/ForkLift
2.43"
(61.7)

Dimensions

3.18"
(80.8)

*See ordering information table for available amperages by series

0.343"
(8.7)

Applications
Lift trucks, scissor lifts, pallet movers, and other
low voltage battery operated equipment used to
move hazardous materials.

Features/Benefits
•	 Evaluated for use in UL 583 hazardous applications
•	 Easily upgrade Type E and ES equipment to Type EE
•	 Does not require an external enclosure

Specifications
Voltage Ratings	
48 Vac/dc
Interrupting Rating	
2,500 A
Ampere Rating	
35 – 800 A
Approval	
UL Recognized (File: E71611)
Torque	
90 in-lb
Fuse Holder	LFFB003
Environmental	
RoHS Compliant
Country of Origin	Mexico

HAZGARD™ Forklift Fuses

Description
HAZGARD fuses are designed to provide overcurrent protection
for low voltage equipment used in hazardous operations. It
is UL 248 recognized and has been evaluated for the use in
UL 583 type EE and ES applications. Unique design does not
require an additional enclosure as is needed with a standard
forklift fuse, saving assembly time and costs.

35
50
60
90

Ordering Information
SERIES

AMPERAGE

581

200

littelfuse.com

CATALOG NUMBER ORDERING NUMBER
581200

AMPERE RATINGS
100
250
125
300
150
400
200
425

500
750*
800*
—

*Contact factory for availability

0581200.X

62

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses — Special Purpose

PLUG FUSES AND BOLT-DOWN FUSES
125 Vac • 2-30 A
Specifications
Voltage Rating	
Interrupting Rating	
Approvals	

125 Vac
10 kA rms symmetrical
UL Listed 248-11

TOO Fuses are dual-element time-delay Edison-base fuses
designed for motor and motor branch circuit protection; also
suitable for all general purpose circuits.
Sample Part # 0TOO020.Z

TOO Fuses

AMPERE RATINGS
12
6 1/4
8
15
10
20

2
4
5

Edison-base plug fuses

Description
Littelfuse Plug fuses provide overcurrent protection to general
purpose circuits and small motor loads. Edison-base Plug
fuses (TOO and TLO series) feature metal threads similar to
incandescent lamp bases.

25
30
—

TLO Fuses are medium time-delay Edison-base fuses
designed for general purpose branch circuit protection.

Type S Plug fuses (SOO and SLO series) utilize a
nonmetallic threaded base and must be used with Type S
adapters (SAO series).

Sample Part # 0TLO020.Z

TLO Fuses

AMPERE RATINGS
20
25

15

The National Electrical Code permits Edison base Plug fuses
to be used for replacement purposes only. Type S fuses and
adapters prevent shunting open fuses and over-fusing.

30

5

®

Special Purpose Fuses

Web Resources
Fine more information: littelfuse.com/plug

32 Vac/dc • 100-300 A

Specifications
Voltage Rating		
Interrupting Rating		

32 Vac/dc
2000 A @ 32 Vdc

Ordering Information
CATALOG
NUMBER
MEG100
MEG125
MEG150
MEG175
MEG200
MEG225
MEG250
MEG300

MEGA® SLO-BLO® bolt-on fuse

Description

AMPERAGE
RATING
100
125
150
175
200
225
250
300

VOLTAGE
RATING
32
32
32
32
32
32
32
32

COLOR
CODE

Recommended Fuse Holders

The MEGA Fuse is designed for the protection of high
current applications. Designed and patented by Littelfuse, it
is ideal for battery and alternator protection and other heavy
gauge cable applications.

© 2014 Littelfuse POWR-GARD® Products Catalog

ORDERING
NUMBER
0MEG100.X
0MEG125.X
0MEG150.X
0MEG175.X
0MEG200.X
0MEG225.X
0MEG250.X
0MEG300.X

Part Number - 298900, see website: littelfuse.com/mega

Web Resources
Find more information: littelfuse.com/mega

63

littelfuse.com

Fuses — Special Purpose
2.25"

7/8"

LGR / LMF IN-LINE FUSES & LHR FUSE HOLDER

0.630"

3/4"

0.423"

0.50"
0.50"

Knock-out Hole

Voltage Rating	
300 Vac
Interrupting Rating	
10 kA
Approvals	Standard 248-14
UL Listed (File: E10480)
0.263" CSA Certified (File: LR29862)
7/8"

Used as in-line protection
for fluorescent fixtures, this
fast-acting fuse is ideal for
increasing the safety and
reliability of lighting fixtures.

Ordering Information
0.630"

3/4"

/
1
Knock-out1 Hole
1 /2
1 2

0.50"
0.50"

0.610"

SERIES
LGR

1.82"

0.610"
LMF
Fuses

Perfect for use in lighting
systems, this 300 Vac time0.610"
delay fuse is designed to
handle ballast transformer
in-rush currents. 1.82"

In-Line Fuses

AMPERAGE
5

9
10
12

15
—
—

CATALOG NUMBER ORDERING NUMBER
LGR005
0LGR005.V

Voltage Rating	
300 Vac
In­ter­rupt­ing Rating	
10 kA
Approvals	Standard 248-14
UL Listed (File: E10480)
CSA Certified (File: LR29862)

1.82"

Ordering Information
/
1/2
6/10
3 10

0.610"

SERIES
LMF

1.82"

/
1
1 1/4
8 10

AMPERE RATINGS
1 6/10
2 8/10
2
3
2 1/2
3 2/10

AMPERAGE
5

4
5
6 1/4

7
8
10

CATALOG NUMBER ORDERING NUMBER
LMF005
0LMF005.V

LHR Fuse Holder

Specifications

Used as in-line protection
for fluorescent fixtures, the
Littelfuse LGR and LMF
series fuses and LHR holder
offer increased safety and
reliability to lighting systems.

Voltage Rating		
300 Vac
2.25"
Ampere Rating		
LHR000 10 A
		
LHR001 10 A
Approvals		
UL Recognized
		
CSA Certified
		
(File: 73160)
0.50"
Flammability Rating		
UL94 V-0
Example
part number	LHR001
0.50"
Ordering number		 0LHR001T

By individually fusing fixtures,
electrical problems
are
2.25"
isolated from the rest of the
circuit. The added benefits of
this is the ability to quickly
identify the problem fixture
and reduce the repair time.

7/8"

3/4"
0.423"

Knock-out
Hole
Knock-out
Hole

Mounting Information

0.630"

LHR001/LHR000 will fit3/4"
keyhole
punch 0.50"
or 0.875" knock-out hole.
Anti-ro­ta­tion fea­ture is pro­vid­ed
Knock-out Hole
when used with key­hole punch.
A “U-shaped” clip is avail­able
for panel mount­ing (pack­aged
10 clips per bag): Order part
0.610"
number LHROCA.
64

Keyhole Pu

0.263"

7/8"

0.50"
Fuse holders are rated up to 10 amperes at 300
volts and are
equipped with 7" 18 AWG leads. Order part number LHR000
for two leads, and part number LHR001 for one lead; with the
other terminal used for insertion of 18 AWG ballast lead.

littelfuse.com

AMPERE RATINGS
1 6/10 0.423" 3
6
2
4
7
Keyhole Punch
2 1/2
5
8

Specifications

Time-Delay • 300 Vac

5

Keyhole Punch

Specifications

LGR Fuses
Fast-Acting • 300 Vac

2.25"

0.263"

0.423"

Keyhole
KeyholePunch
Punch
2.25"

7/8

3/4"
0.50"
0.50"

1.82" POWR-GARD® Products Catalog
© 2014 Littelfuse

Knock-ou

Fuses — Special Purpose

CABLE LIMITERS
600 Vac
Description
Cable limiters are fusible devices that provide very fast
short-circuit protection, primarily to faulted cables, but also to
other conductors such as busway. Cable limiters do not have
an ampere rating, and cannot be used to provide overload
protection. They are instead selected by cable size; for example,
a 500 kcmil cable requires a 500 kcmil cable limiter. Their
main use is to isolate faulted cables in circuits con­tain­ing
three or more parallel conductors per phase. They may be
installed on the line side of the main service to provide shortcircuit protection to the service conductors. This is especially
important when service conductors are tapped from large low
voltage networks or from large low impedance transformers.
Cable limiters have terminals which permit them to be installed
in a variety of equipment. The most common configuration is
the offset blade on one end and the crimp terminal on the other
end. This permits the limiter to replace a cable terminal (lug).

Applications

5

•	 Service entrance conductors
DESCRIPTION
TERMINATION CABLE SIZE

1
CABLE TO CABLE

3
CABLE TO
OFFSET BUS

5
STRAIGHT BUS
TO OFFSET BUS

6
MOLE TO CABLE

8
MOLE TO
OFFSET BUS

4/0
250MCM
350MCM
500MCM
750MCM
4/0
250MCM
350MCM
500MCM
750MCM
4/0
250MCM
350MCM
500MCM
750MCM
4/0
250MCM
350MCM
500MCM
750MCM
4/0
250MCM
350MCM
500MCM
750MCM

•	 Between transformer or network bus and busway
terminal boxes

CABLE TYPE
COP­PER
ALUMINUM
LFCL4/0C1
LFCL4/0A1
LFCL250C1
LFCL250A1
LFCL350C1
LFCL350A1
LFCL500C1
LFCL500A1
LFCL750C1
LFCL750A1
LFCL4/0C3
LFCL4/0A3
LFCL250C3
LFCL250A3
LFCL350C3
LFCL350A3
LFCL500C3
LFCL500A3
LFCL750C3
LFCL750A3
LFCL4/0C5
—
LFCL250C5
—
LFCL350C5
—
LFCL500C5
—
LFCL750C5
—
LFCL4/0C6
LFCL4/0A6
LFCL250C6
LFCL250A6
LFCL350C6
LFCL350A6
LFCL500C6
LFCL500A6
LFCL750C6
LFCL750A6
LFCL4/0C8
—
LFCL250C8
—
LFCL350C8
—
LFCL500C8
—
LFCL750C8
—

•	 Large feeders with three or more conductors per phase

Features
•	 Current-limiting characteristics provide pro­tec­tion to
conductor insulation and reduce damage when faults occur.
•	 Properly applied cable limiters may permit the use of
equip­ment with reduced withstand ratings
•	 Wide variety of terminations and cable ratings permit use
in almost every situation.

Specifications
Voltage Ratings		
Interrupting Rating		
Cable Size Range	 	

Note: For Type 5 and Type 8 Aluminum cable limiters, use the Copper Type C5 and C8.

Ordering Information
LFCL - 500 - C - 1
Littelfuse
Cable Limiter

Note: For Type 5 and Type 8 Aluminum cable limiters, use the Copper Type C5 and C8.

Conductor Size
Terminal Material

Web Resources

(Aluminum or Copper)

For additional information, visit: littelfuse.com/lfcl

© 2014 Littelfuse POWR-GARD® Products Catalog

600 Vac
200 kA
4/0 – 750MCM Copper or Aluminum

Type of
Termination

65

littelfuse.com

Cable Limiters

TYPE

CATALOG NUMBER

Fuses — Special Purpose

CYLINDRICAL FUSES
0.5 -100  A

Description
Littelfuse fast acting (gL-gG) fuses are used for the
protection of cables against short-circuits. Time-lag (aM)
fuses are used for protection of motors.

Specifications
Standards 	
	

10x38 mm: IEC 60269
14x51 mm / 22x58mm: IEC 269-2-1

Ordering Information
BASE PART
NUMBER

SIZE
(mm)

CY10X38

10 x 38

CY14X51

14 x 51

50 A

5
Cylindrical Fuses

CURRENT
RANGE
0.5-25 A
32 A
2-25 A
32-40 A

CY22X58
AMPERAGE

10 X 38
CY10X38G05
CY10X38G1
CY10X38G2
CY10X38G4
CY10X38G6
CY10X38G8
CY10X38G10
CY10X38G12
CY10X38G16
CY10X38G20
CY10X38G25
CY10X38G32
—
—
—
—
—

0.5
1
2
4
6
8
10
12
16
20
25
32
40
50
63
80
100

gL-gG ORDERING NUMBERS
14 X 51
22 X 58
—
—
—
—
CY14X51G2
—
CY14X51G4
—
CY14X51G6
—
CY14X51G8
—
CY14X51G10
—
CY14X51G12
—
CY14X51G16
CY22X58G16
CY14X51G20
CY22X58G20
CY14X51G25
CY22X58G25
CY14X51G32
CY22X58G32
CY14X51G40
CY22X58G40
CY14X51G50
CY22X58G50
—
CY22X58G63
—
CY22X58G80
—
CY22X58G100

10 X 38
14 X 51
22 X 58

DIMENSIONS mm
A
B
10
38
14
51
22
58

AMP
RATING
32 A
32 A
32 A
32 A
32 A
32 A
32 A
32 A
50 A
50 A
50 A
125 A
125 A
125 A

Web Resources
For additional product information
Fuses: littelfuse.com/cylindrical
Fuse Holders: littelfuse.com/lfpsm
littelfuse.com/cyh
littelfuse.com

10 X 38
CY10X38M05
CY10X38M1
CY10X38M2
CY10X38M4
CY10X38M6
CY10X38M8
CY10X38M10
CY10X38M12
CY10X38M16
CY10X38M20
CY10X38M25
CY10X38M32
—
—
—
—
—

500 V
400 V
690 V
500 V
500 V (gL-gG)
400 V (aM)
690 V
500 V

aM ORDERING NUMBERS
14 X 51
—
—
CY14X51M2
CY14X51M4
CY14X51M6
CY14X51M8
CY14X51M10
CY14X51M12
CY14X51M16
CY14X51M20
CY14X51M25
CY14X51M32
CY14X51M40
CY14X51M50
—
—
—

INTERRUPTING
RATING
120 kA
120 kA
80 kA
120 kA
120 kA
120 kA
80 kA
120 kA
22 X 58
—
—
—
—
—
—
—
—
CY22X58M16
CY22X58M20
CY22X58M25
CY22X58M32
CY22X58M40
CY22X58M50
CY22X58M63
CY22X58M80
CY22X58M100

Fuse Holders

Dimensions
FUSE SIZE

16-63 A
80-100 A

22 x 58

VOLTAGE (AC)

POLES

SIZE

1
2
3
4
1
2
3
4
1
2
3
1
2
3

10 X 38
10 X 38
10 X 38
10 X 38
10 X 38
10 X 38
10 X 38
10 X 38
14 X 51
14 X 51
14 X 51
22 X 58
22 X 58
22 X 58

CATALOG /
ORDERING #
LFPSM0001Z
LFPSM0002Z
LFPSM0003Z
LFPSM0004Z
LFPSM0001ZXID*
LFPSM0002ZXID*
LFPSM0003ZXID*
LFPSM0004ZXID*
CYH14511
CYH14512
CYH14513
CYH22581
CYH22582
CYH22583

TERMINAL
TYPE
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate
Pressure Plate

DIN RAIL
MOUNT
•
•
•
•
•
•
•
•
•
•
•
•
•
•

* Indicating

66

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses — Special Purpose

OEM CUSTOM PRODUCTS
Description
We understand that existing solutions don’t always solve
your current problems. Building on more than 85 years of
circuit protection experience, the Littelfuse engineering
team collaborates with customers to develop customized
solutions for applications such as solar panels, HVAC
systems, lift trucks, lighting fixtures, industrial restaurant
equipment and power converters.
1

Process

2

The custom product design process begins with a situation
analysis from our experienced engineers followed by our
4-step collaborative product development process.
1.	 Initial concept sketch created
2.	 CAD drawings to formalize the product description
3.	 3D solid prototype to verify design
4.	 Final production parts that meet your design needs
and specifications

3

5

Additional Customized Products

4

HAZGARD Fork Lift Fuse...............................................62
OEM Custom Products

To speak with a sales associate regarding your application needs,
call 800-TEC-FUSE (800-382-3873) or email techline@littelfuse.com.

Web Resources
To learn more and contact our OEM team, visit:
littelfuse.com/industrialoem

Examples

Two-Pole Combination Block

Custom-Leaded Fuse

Save space and money by combining multiple
components in one unit. Littelfuse collaborated with the
customer to develop a cost effective UL listed component
that combined a 600 Volt 100A two-pole Class T fuse
block with a two-openings-per-pole splicer block.

Save space and reduce cost by eliminating the fuse
block component. Littelfuse designed a series of custom
through-hole PC-board mountable KLKD Midget fuses for
a consumer application where reduced cost was more
important than replaceability.

© 2014 Littelfuse POWR-GARD® Products Catalog

67

littelfuse.com

Section Overview
Littelfuse high-speed semiconductor fuses protect critical power
semiconductors against short circuits in applications including
inverters, variable-speed drives, UPS and DC drive systems.
For the complete portfolio of high-speed products visit:
littelfuse.com/High-Speed

SEMICONDUCTOR FUSES
Table of Contents
L Series (Traditional) Semiconductor Fuses................................ 69
LA Series (Alternate Dimension) Semiconductor Fuses..............71
Square Body Semiconductor Fuses............................................. 77

POWR-GARD® High-Speed
Circuit Protection
Littelfuse engineering is constantly developing
new products to meet the needs of the industry.
For the latest information on the growing
POWR-GARD Product portfolio, visit:
littelfuse.com/High-Speed

littelfuse.com

68

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

TRADITIONAL SEMICONDUCTOR FUSES
150/250/500/600/700 Vac • Very Fast-Acting • 1-1200 A

Ordering Information
AMPERE
RATINGS

Specifications
Voltage Ratings
L15S:	
	
	
L25S:	
	
	
L50S:	
L60S:	
KLC:	
L70S:	

150 Vac/dc (1 – 60 A)
150 Vac (70 – 1000 A)
100 Vdc (70 – 1000 A)
250 Vac/dc (1 – 200 A)
250 Vac (225 – 800 A)
200 Vdc (225 – 800 A)
500 Vac/450 Vdc
600 Vac
600 Vac
700 Vac/650 Vdc

L25S series fuses are Littelfuse Certified for DC ratings
shown in Rating Table.
Interrupting Rating
AC:	
200 kA rms
	
(L15S series 100 kA)
DC:	
20 kA
Ampere Range	
	
Approvals 	
	

1 – 1200 A	 See Rating Table for
ratings available in each series.
UL Recognized (File: E71611)
CSA Recognized (File: LR29862)

Recommended Fuse Holders
1LFS101/1LFS102....................................121
LSCR001/LSCR002..................................120

Web Resources
For additional information, visit:
littelfuse.com/semi

‡

© 2014 Littelfuse POWR-GARD® Products Catalog

L15S
L15S001
L15S002
L15S003
L15S004
L15S005
L15S006
L15S007
L15S008
L15S009
L15S010
L15S012
L15S015
–
L15S020
L15S025
L15S030
L15S035
L15S040
L15S045
L15S050
L15S060
L15S070
L15S080
L15S090
L15S100
–
L15S125
L15S150
–
L15S200
–
L15S250
–
L15S300
L15S350
L15S400
L15S450
L15S500
–
L15S600
–
L15S800
–
L15S1000
–

L25S
L25S001
L25S002
L25S003
L25S004
L25S005
L25S006
–
L25S008
–
L25S010
L25S012
L25S015
–
L25S020
L25S025
L25S030
L25S035
L25S040
L25S045
L25S050
L25S060
L25S070
L25S080
L25S090
L25S100
–
L25S125
L25S150
L25S175
L25S200
L25S225
L25S250
L25S275
L25S300
L25S350
L25S400
L25S450
L25S500
–
L25S600
L25S700
L25S800
–
–
–

L50S
–
–
–
–
–
–
–
–
–
L50S010
L50S012
L50S015
–
L50S020
L50S025
L50S030
L50S035
L50S040
–
L50S050
L50S060
L50S070
L50S080
L50S090
L50S100
–
L50S125
L50S150
L50S175
L50S200
L50S225
L50S250
L50S275
L50S300
L50S350
L50S400
L50S450
L50S500
L50S550
L50S600
L50S700
L50S800
LA50P9004
LA50P10004
LA50P12004

L60S
L60S001
L60S002
L60S003
L60S004
L60S005
L60S006
–
L60S008
–
L60S010
L60S012
L60S015
L60S17.5
L60S020
L60S025
L60S030
L60S035
L60S040
L60S045
L60S050
L60S060
L60S070
L60S080
L60S090
L60S100
–
L60S125
L60S150
L60S175
L60S200
L60S225
L60S250
–
L60S300
L60S350
L60S400
L60S450
L60S500
–
L60S600
L60S700
L60S800
–
–
–

KLC ‡
KLC001
KLC002
KLC003
KLC004
KLC005
KLC006
KLC007
KLC008
–
KLC010
KLC012
KLC015
KLC17.5
KLC020
KLC025
KLC030
KLC035
KLC040
KLC045
KLC050
KLC060
KLC070
KLC080
KLC090
KLC100
KLC110
KLC125
KLC150
KLC175
KLC200
KLC225
KLC250
–
KLC300
KLC350
KLC400
KLC450
KLC500
–
KLC600
KLC700
KLC800
–
–
–

L70S
–
–
–
–
–
–
–
–
–
L70S010
–
L70S015
–
L70S020
L70S025
L70S030
L70S035
L70S040
–
L70S050
L70S060
L70S070
L70S080
L70S090
L70S100
–
L70S125
L70S150
L70S175
L70S200
L70S225
L70S250
–
L70S300
L70S350
L70S400
L70S450
L70S500
–
L70S600
L70S700
L70S800
LA70P9004
LA70P10004
LA70P12004

KLC series fuses are recommended for replacement use only.

69

littelfuse.com

5
Semiconductor Fuses

1
2
3
4
5
6
7
8
9
10
12
15
17 1⁄ 2
20
25
30
35
40
45
50
60
70
80
90
100
110
125
150
175
200
225
250
275
300
350
400
450
500
550
600
700
800
900
1000
1200

SERIES ORDERING NUMBER

Fuses – Semiconductor

TRADITIONAL SEMICONDUCTOR FUSES
Dimensions
AMPERE
RATING

FIG.
NO.

A

B

C

DIMENSIONS INCHES (mm)
D
E

F

G

H

L15S Series, 150 Vac
1 – 30

1

11⁄2 (38.1)

—

31 – 60

1

2 (50.8)

—

61 – 450

3

1 5 ⁄32 (29.4)

1 7⁄ 8 (47.6)

451 – 1000

3

1 ⁄ (31.8)
14

3 8

⁄ (9.5)

13 32

⁄ (15.9)

13 16

5 8

—

—

—

—

—

—

—

—

2 3 ⁄16 (55.6) 2 21 ⁄32 (67.5)

1 ⁄ (49.2) 2 ⁄ (65.1)
15 16

⁄ (10.3)

⁄ (20.6)

9 16

3 ⁄ (88.9)

⁄ (12.7)

9 16

12

1 (25.4)

⁄ (17.1)

43 64

1 ⁄ (38.1)

1 (25.4)

12

⁄ (7.9)

3 16

⁄ (10.3)

14

5 16
13 32

D
C

⁄ (4.8)

A

⁄ (6.4)

Fig. 1

L25S Series, 250 Vac
1 – 30

1

2 (50.8)

—

31 – 60

2

15 ⁄8 (41.3)

2 1⁄4 (57.2)

2 1⁄2 (63.5)

3 3 ⁄16 (81.0)

13 16

61 – 200

3

15 ⁄8 (41.3)

2 5 ⁄16 (58.7)

2 7⁄16 (61.9)

3 1⁄ 8 (79.4)

1 7⁄32 (31.0)

1 (25.4)

5 16

201 – 700

3

1 ⁄ (40.5) 2 ⁄ (57.9) 2 ⁄ (73.8) 3 ⁄ (97.6)

1 ⁄ (38.1)

1 (25.4)

13 32

701 – 800

3

119 ⁄32 (40.5) 2 9 ⁄32 (57.9) 2 29 ⁄ 32 (73.8) 3 27⁄32 (97.6)

2 (50.8)

11⁄2 (38.1)

13 32

19 32

9 32

12

29 32

⁄ (14.3)

27 32

—
⁄ (20.6)

—
⁄ (18.3)

23 32

12

—

—

⁄ (8.7)

18

⁄ (7.9)

3 16

⁄ (10.3)

14

⁄ (10.3)

14

11 32

⁄ (3.2)

⁄ (4.8)
⁄ (6.4)
⁄ (6.4)

L50S Series, 500 Vac / 450 Vdc

Semiconductor Fuses

5

10 – 30

1

2 (50.8)

—

31 – 60

2

1 ⁄ (41.3)

61 – 100

3

101 – 200

⁄ (12.7)

12

⁄ (14.3)

—

9 16

2 ⁄ (57.2)

12

2 ⁄ (63.5)

3 ⁄ (81.0)

2 ⁄ (54.0)

2 ⁄ (68.3)

3 (76.2)

3

2 1 ⁄8 (54.0)

2 13 ⁄16 (71.4) 2 15 ⁄16 (74.6)

201 – 400

3

401 – 600
601 – 800

—

—

⁄ (20.6)

23 32

⁄ (18.3)

11 32

3 ⁄ (92.1)

1 (25.4)

.670 (17.0)

11 32

3 5 ⁄8 (92.1)

1 7⁄ 32 (31.0)

.895 (22.7)

5 16

2 3 ⁄ 32 (53.2) 2 25 ⁄ 32 (70.6) 3 13 ⁄ 32 (86.5) 4 11 ⁄ 32 (110.3)

11⁄2 (38.1)

1 (25.4)

13 32

3

2 7⁄ 32 (56.4) 2 29 ⁄ 32 (73.8) 3 17⁄ 32 (89.7) 4 15 ⁄ 32 (113.5)

2 (50.8)

11⁄2 (38.1)

13 32

3

2 7⁄ 32 (56.4) 4 9 ⁄ 32 (108.7) 4 5 ⁄8 (117.5) 6 15 ⁄ 32 (164.3) 2 1⁄2 (63.5)

2 (50.8)

17 32

5 8

1 8

14

11 16

3 16
5 8

13 16

—

⁄ (8.7)

1 8

⁄ (8.7)

1 8

⁄ (7.9)

3 16

F

⁄ (3.2)
⁄ (3.2)

A
B
C
D

G

⁄ (4.75)

⁄ (10.3)

14

⁄ (10.3)

14

⁄ (6.4)

⁄ (13.5)

3 8

H

E

Fig, 2

⁄ (6.4)
⁄ (9.5)

L60S Series, 600 Vac
1 – 30

1

5 (127.0)

31 – 60

2

2 ⁄ (70.6) 3 ⁄ (87.3) 3 ⁄ (93.7) 4 3 ⁄8 (111.1)

⁄ (20.6)

23 32

61 – 100

2

2 29 ⁄32 (73.8) 3 17⁄32 (89.7) 3 25 ⁄32 (96.0) 4 15 ⁄32 (113.5) 11 ⁄16 (27.0)

23 32

25 32

—
7 16

⁄ (15.9)

5 8

⁄ (20.6)

—

13 16

11 16

13 16

—

—

⁄ (18.3)

11 32

⁄ (8.7)

⁄ (18.3)

11 32

⁄ (8.7)

18

⁄ (7.9)

3 16

⁄ (10.3)

14

101 – 200

2

2 ⁄ (73.8) 3 ⁄ (90.5)

3 ⁄ (95.3) 4 ⁄ (111.9) 1 ⁄ (33.3)

1 (25.4)

5 16

201 – 400

2

2 29 ⁄ 32 (73.8) 3 31 ⁄ 32 (100.8) 4 5 ⁄32 (105.6) 5 1⁄8 (130.2) 137⁄64 (40.1)

1 (25.4)

13 32

401 – 600

2

2 7⁄8 (73.0) 3 31 ⁄ 32 (100.8) 4 9 ⁄64 (105.2) 5 1⁄8 (130.2)

2 1 ⁄16 (52.8)

11⁄2 (38.1)

13 32

601 – 800

2

3 ⁄ (77.0) 5 ⁄ (133.4) 5 ⁄ (135.7) 7 ⁄ (184.2)

2 ⁄ (63.5)

2 (50.8)

17 32

—

—

29 32

1 32

9 16

5 32

3 4

11 32

13 32

14

5 16

12

—
⁄ (3.2)

18

⁄ (3.2)

⁄ (4.8)

F

⁄ (6.4)

⁄ (10.3)

14

⁄ (13.5)

3 8

⁄ (6.4)

G

⁄ (9.5)

L70S Series, 700 Vac / 650 Vdc
—

⁄ (12.7)

⁄ (14.3)

10 – 30

1

2 (50.8)

31 – 60

3

2 7⁄8 (73.0)

3 7⁄16 (87.3) 3 25 ⁄ 32 (96.0) 4 3 ⁄8 (111.1)

1 (25.4)

43 64

2 ⁄ (73.0)

29 32

12

9 16

—

⁄ (17.1)

11 32

⁄ (22.9)

5 16

18

61 – 100

3

3 ⁄ (90.5) 3 ⁄ (93.7) 4 ⁄ (111.1)

1 ⁄ (31.0)

3

2 27⁄ 32 (72.2) 3 17⁄ 32 (89.7) 4 5 ⁄ 32 (105.6) 5 3 ⁄ 32 (129.4)

1 1⁄2 (38.1)

1(25.4)

13 32

201 – 400

3

2 ⁄ (72.2) 3 ⁄ (89.7) 4 ⁄ (105.6) 5 ⁄ (129.4)

2 (50.8)

12

1 ⁄ (38.1)

13 32

401 – 600

3

2 27⁄ 32 (72.2) 4 29 ⁄ 32 (124.6) 5 1⁄4 (133.4) 7 3 ⁄ 32 (180.2) 2 1⁄2 (63.5)

2 (50.8)

17 32

601 – 800

4

27 32

9 16

17 32

11 16

5 32

3 8

3 32

3 5 ⁄16 (84.1) 5 5 ⁄16 (134.9) 6 13 ⁄16 (173.0)

—

7 32

2 7⁄8 (73.0)

2 (50.8)

⁄ (3.2)

⁄ (7.9)

3 16

⁄ (10.3)

14

⁄ (10.3)

14

⁄ (13.5)

3 8

⁄ (15.9)

5 8

⁄ (4.8)
⁄ (6.4)
⁄ (6.4)
⁄ (9.5)

H: 3 ⁄ 8 (9.5)
J: 5 ⁄16 (7.9)

KLC Series, 600 Vac
1 – 30

2

17⁄8 (47.6)

2 1⁄2 (63.5)

31 – 60

2

2 3 ⁄4 (69.9)

3 3 ⁄8 (85.7)

61 – 100

3

2 7⁄8 (73.0)

3 21 ⁄ 32 (92.9) 4 1 ⁄16 (103.2)

101 – 200

3

2 ⁄ (72.2) 3 ⁄ (89.7) 4 ⁄ (111.1) 5 ⁄ (129.4)

201 – 400

3

401 – 800

3

littelfuse.com

—

2 7⁄8 (73.0)

3 5 ⁄8 (92.1) 4 5 ⁄16 (109.5)

13 32

⁄ (20.6)

23 32

13 16

14

⁄ (6.4)

3 64

⁄ (18.3)

11 32

⁄ (8.7)

1 8

⁄ (10.3)

1 8

⁄ (10.3)

14

⁄ (14.3)

14

⁄ (14.3)

3 8

⁄ (19.1)

13 32

1 ⁄ (38.1)

1 (25.4)

13 32

2 27⁄ 32 (72.2) 4 21 ⁄ 32 (118.3) 4 27⁄ 32 (123.0) 6 1⁄4 (158.8)

2 (50.8)

1 5 ⁄ 8 (41.3)

9 16

2 27⁄ 32 (72.2) 4 21 ⁄ 32 (118.3) 5 11 ⁄ 32 (135.7) 6 1⁄4 (158.8)

2 1⁄2 (63.5)

2 (50.8)

9 16

17 32

3 8

3 32

1 (25.4)

⁄ (10.3)

3 4

27 32

5 (127.0)

⁄ (14.3)

9 16

12

70

E

Fig. 3

—

⁄ (8.7)

101 – 200

78

H

A
B
C
D

⁄ (1.2)
⁄ (3.2)
⁄ (3.2)

⁄ (6.4)

F
G

A
B
C

J
E

Fig. 4

⁄ (6.4)
⁄ (9.5)

© 2014 Littelfuse POWR-GARD® Products Catalog

H

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
150 Vac • Very Fast-Acting • 1-6000 A
LA15QS Series
CATALOG
NUMBER

1
3
4
5
6
7
8
10
12
15
20
25
30
35
40
40
45
50
50
55
60
70
70
80
80
90
100
100
130
130
150
150
150
200
200

LA15QS1-2
LA15QS3-2
LA15QS4-2
LA15QS5-2
LA15QS6-2
LA15QS7-2
LA15QS8-2
LA15QS10-2
LA15QS12-2
LA15QS15-2
LA15QS20-2
LA15QS25-2
LA15QS30-2
LA15QS35-1
LA15QS40-1
LA15QS40-4TI
LA15QS45-1
LA15QS50-1
LA15QS50-4
LA15QS55-1
LA15QS60-1
LA15QS70-4
LA15QS70-4TI
LA15QS80-4
LA15QS80-4TI
LA15QS90-4
LA15QS100-4
LA15QS100-4TI
LA15QS130-4
LA15QS130-4TI
LA15QS150-4
LA15QS150-4IL
LA15QS150-4TI
LA15QS200-4
LA15QS200-4IL

MAXIMUM
WATTS LOSS
MOUNTING
CLEARING I2t @
@ RATED
TYPE
2
3
150 Vac (A s x 10 ) CURRENT (W)
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
4TI
1
1
4
1
1
4
4TI
4
4TI
4
4
4TI
4
4TI
4
4IL
4TI
4
4IL

0.0002
0.003
0.007
0.012
0.022
0.011
0.015
0.019
0.030
0.042
0.072
0.14
0.25
0.21
0.28
0.39
0.34
0.47
0.64
Contact Factory
0.94
2
2
2.5
2.5
3.1
3.6
3.6
5.3
5.3
6.8
6.8
6.8
9
9

0.68
1.7
2.1
2.8
3.1
2.2
2.5
2.6
3
3
4
5.2
5.6
9
10
3.1
12
13
4
Contact Factory
14
5.6
5.6
8
8
9
10
10
14
14
16
16
16
22
22

Specifications
Voltage Rating 		
		
Interrupting Rating		
Ampere Range		
Approvals 		

AMPERE
RATING

CATALOG
NUMBER

250
250
300
300
300
350
350
400
400
400
450
450
500
500
600
600
800
1000
1000
1000
1000
1000
1200
1200
1500
1500
2000
2000
2500
2500
3000
3000
3500
4000
4000
5000
6000

LA15QS250-4
LA15QS250-4TI
LA15QS300-4
LA15QS300-4IL
LA15QS300-4TL
LA15QS350-4
LA15QS350-4TI
LA15QS400-4
LA15QS400-4IL
LA15QS400-4TI
LA15QS450-4
LA15QS450-4IL
LA15QS500-4
LA15QS500-4IL
LA15QS600-4
LA15QS600-4IL
LA15QS800-4
LA15QS1000-4
LA15QS1000-4IL
LA15QS1000-4TI
LA15QS1000-128
LA15QS1000-128IL
LA15QS1200-128
LA15QS1200-128IL
LA15QS1500-128
LA15QS1500-128IL
LA15QS2000-128
LA15QS2000-128IL
LA15QS2500-128
LA15QS2500-128IL
LA15QS3000-128
LA15QS3000-128IL
LA15QS3500-128
LA15QS4000-128
LA15QS4000-128IL
LA15QS5000-128
LA15QS6000-128

MAXIMUM
WATTS LOSS
MOUNTING
CLEARING I2t @
@ RATED
TYPE
2
3
150 Vac (A s x 10 ) CURRENT (W)
4
4TI
4
4IL
4TI
4
4TI
4
4IL
4TI
4
4IL
4
4IL
4
4IL
4
4
4IL
4TI
128
128IL
128
128IL
128
128IL
128
128IL
128
128IL
128
128IL
128
128
128IL
128
128

15
15
22
22
22
32
32
40
40
40
50
50
90
90
130
130
290
520
520
520
540
540
680
680
1200
1200
1900
1900
3200
3200
4800
4800
6500
8500
8500
Contact Factory
Contact Factory

Figure 1

AC: 	 150 V
DC: 	 150 V
100 kA
1 – 6000 A
UL Recognized

Figure 2

Figure 3

Web Resources

22
27
33
33
33
40
40
45
45
45
50
50
30
30
35
35
57
75
75
75
88
88
100
100
130
130
165
165
195
195
240
240
260
270
270
Contact Factory
Contact Factory

Figure 4

Figure 5

For additional information, visit: littelfuse.com/la15qs

Dimensions

Dimensions for reference only.

AMPERE
RATINGS

MOUNTING
TYPE

FIGURE
NO.

1 – 30
35 – 60
40 – 450
500 – 1000
750 – 2000
2500 – 3000
3500 – 4000
5000 – 6000

2
1
4, 4TI*, 4IL*
4, 4TI*, 4IL*
128, 128IL*
128, 128IL*
128, 128IL*
128

1
1
2
2
3
3
4
5

1.50
2.00
2.66
3.50
1.88
1.88
1.88
2.38

A

(38.1)
(50.8)
(67.6)
(88.9)
(47.9)
(47.9)
(47.9)
(60.5)

0.41
0.81
1.00
1.50
2.00
3.00
3.50
5.75

B

(10.4)
(20.6)
(25.4)
(38.1)
(50.8)
(76.2)
(88.9)
(146)

C

–
–
1.16 (29.5)
1.25 (31.8)
1.63 (41.4)
1.63 (41.4)
1.63 (41.4)
1.88 (47.7)

DIMENSIONS INCHES (mm)
D
E
–
–
2.19 (55.6)
2.56 (65.0)
1.75 (44.5)
2.50 (63.5)
3.00 (76.2)
5.00 (127)

–
–
1.91 (48.5)
1.94 (49.3)
1.00 (25.4)
1.50 (38.1)
1.06 (27.0)
1.50 (38.1)

F

–
–
0.31 (7.9)
0.41 (10.4)
–
–
1.06 (27.0)
1.50 (38.1)

G

–
–
0.88 (22.4)
1.00 (25.4)
–
–
–
–

H

–
–
0.19 (4.8)
0.25 (6.4)
–
–
–
–

TAP
–
–
–
–
3
⁄8 -24-1⁄2 deep
1
⁄2 -20-1⁄2 deep
1
⁄2 -20-1⁄2 deep
1
⁄2 -20-1⁄2 deep

*Optional Trigger Actuator (IL). Optional Trigger Indicator (TI) see web for dimensions.

© 2014 Littelfuse POWR-GARD® Products Catalog

71

littelfuse.com

5
Semiconductor Fuses

AMPERE
RATING

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
300 Vac • Very Fast-Acting • 35-4500 A
LA30QS Series

Semiconductor Fuses

5

AMPERE
RATING

CATALOG
NUMBER

35
40
50
60
70
80
90
100
100
125
130
150
150
175
200
200
225
250
250
300
300
350
400
400
400
450

LA30QS35-4
LA30QS40-4
LA30QS50-4
LA30QS60-4
LA30QS70-4
LA30QS80-4
LA30QS90-4
LA30QS100-4
LA30QS100-4TI
LA30QS125-4
LA30QS130-4
LA30QS150-4
LA30QS150-4TI
LA30QS175-4
LA30QS200-4
LA30QS200-4TI
LA30QS225-4
LA30QS250-4
LA30QS250-4TI
LA30QS300-4
LA30QS300-4TI
LA30QS350-4
LA30QS400-4
LA30QS400-4IL
LA30QS400-4TI
LA30QS450-4

MAXIMUM WATTS LOSS
@ RATED
MOUNTING CLEARING I2 t
CURRENT
TYPE
@300 VAC
(W)
(A 2s X 10 3)
4
0.9
6.4
4
1.2
7
4
2
9.9
4
2.7
11.6
4
1.6
11
4
2.6
11
4
3.2
13
4
4.1
13
4TI
4.1
13
4
6.3
16
4
6.3
16
4
9.3
19
4TI
9.3
19
4
10
27
4
15
30
4TI
15
30
4
22
33
4
25
41
4TI
25
41
4
37
47
4TI
37
47
4
62
49
4
83
56
4IL
83
56
4TI
83
56
4
130
53

AMPERE
RATING

CATALOG
NUMBER

500
550
600
600
600
700
700
800
800
800
1000
1000
1200
1500
1500
1600
2000
2000
2500
2500
3000
3500
3500
4000
4500

LA30QS500-4
LA30QS550-4
LA30QS600-4
LA30QS600-4TI
LA30QS600-4IL
LA30QS700-4
LA30QS700-128
LA30QS800-4
LA30QS800-4IL
LA30QS800-128
LA30QS1000-128
LA30QS1000-128IL
LA30QS1200-128
LA30QS1500-128
LA30QS1500-128IL
LA30QS1600-128
LA30QS2000-128
LA30QS2000-128IL
LA30QS2500-128
LA30QS2500-128IL
LA30QS3000-128
LA30QS3500-128
LA30QS3500-128IL
LA30QS4000-128
LA30QS4500-128

MAXIMUM WATTS LOSS
MOUNTING CLEARING I2 t @ RATED
CURRENT
TYPE
@300 VAC
(W)
(A 2s X 10 3)
4
160
59
4
190
65
4
230
69
4TI
230
69
4IL
230
69
4
260
90
128
260
73
4
330
108
4IL
330
108
128
330
84
128
460
105
128IL
460
105
128
880
110
128
1400
140
128IL
1400
140
128
1690
150
128
2600
190
128IL
2600
190
128
4000
230
128IL
4000
230
128
4700
340
128
6500
380
128IL
6500
380
128
8600
450
128
11000
500

Description
Littelfuse LA30QS series Semiconductor protection fuses
are intended for the protection of Power Semiconductors
such as diodes, phase control SCR’s and other power
semiconductor devices. The LA30QS is recommended
for new applications providing solutions for your critical
protection needs for 300V and less semiconductors.

Figure 1

Figure 2

Specifications
Voltage Rating		
		
Interrupting Rating 		
Ampere Range	
	
Approvals		

AC: 	 300 V
DC: 	 300 V
200 kA
35 – 4500 A
UL Recognized

Figure 3

Figure 4

Web Resources
For additional information, visit: littelfuse.com/la30qs

Dimensions
AMPERE
RATING
35 – 60
70 – 200
225 – 800
800 – 1200
1500 – 2500
3000 – 4500

MOUNTING
TYPE
4
4
4, 4IL*
128
128, 128IL*
128, 128IL*

Dimensions for reference only.
FIGURE
NO.
1
2
2
3
4
4

DIMENSIONS INCHES (mm)
A
B
C
D
E
F
3.19 (81.0) 0.81 (20.6) 1.63 (41.4) 2.50 (63.5) 2.25 (57.5) 0.34 (8.6)
3.13 (79.5) 1.22 (31.0) 1.63 (41.4) 2.44 (62.0) 2.31 (58.7) 0.31 (7.9)
3.84 (97.5) 1.50 (38.1) 1.59 (40.1) 2.91 (73.9) 2.28 (57.9) 0.41 (10.4)
2.59 (65.8) 3.00 (76.2) 2.34 (59.4) 2.50 (63.5) 1.50 (38.1)
–
2.59 (65.8) 3.50 (88.9) 2.34 (59.4) 3.00 (76.2) 1.50 (38.1) 1.50 (38.1)
2.59 (65.8) 4.50 (114) 2.34 (59.4) 3.75 (95.3) 1.50 (38.1) 1.50 (38.1)

G
0.72 (18.3)
1.00 (25.4)
1.00 (25.4)
–
–
–

H
0.13 (3.3)
0.19 (4.8)
0.25 (6.4)
–
–
–

TAP
–
–
–
3 8
⁄ -24-1⁄2 deep
3 8
⁄ -24-1⁄2 deep
12
⁄ -20-1⁄2 deep

*Optional Trigger Actuator (IL). Optional Trigger Indicator (TI) see web for dimensions.

littelfuse.com

72

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
500 Vac • Very Fast-Acting • 35-1200 A
LA50QS Series

Description

CATALOG
NUMBER

MOUNTING
TYPE

35
40
50
60
70
80
90
100
125
150
175
200
225
250
300
350
400
450
500
600
700
800
900
1000
1200

LA50QS35-4
LA50QS40-4
LA50QS50-4
LA50QS60-4
LA50QS70-4
LA50QS80-4
LA50QS90-4
LA50QS100-4
LA50QS125-4
LA50QS150-4
LA50QS175-4
LA50QS200-4
LA50QS225-4
LA50QS250-4
LA50QS300-4
LA50QS350-4
LA50QS400-4
LA50QS450-4
LA50QS500-4
LA50QS600-4
LA50QS700-4
LA50QS800-4
LA50QS900-4
LA50QS1000-4
LA50QS1200-4

4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4

MAXIMUM
CLEARING I2 t
@500 VAC
(A 2s X 10 3)
0.56
0.69
1.1
1.6
1.9
2.6
3.6
4.4
5.6
9
15
20
25
29
55
88
98
130
160
220
270
360
500
560
930

Littelfuse LA50QS series fuses were developed to
improve the overall performance of semiconductor fuses.
The LA50QS provides the high performance protection
characteristics including lower I2t, longer life when subjected
to cyclic loading and lower watts loss. LA50QS is the leading
choice for the protection of dynamic solid state equipment.

WATTS LOSS
@ RATED
CURRENT (W)
6
7
8
10
12
14
15
17
21
25
29
33
37
41
49
57
65
69
77
92
110
130
140
160
175

Specifications
Voltage Rating 		
		
Interrupting Rating 		
		
Ampere Range		
Approvals 		
		

AC: 	 500 V
DC: 	 500 V
AC: 	 200 kA
DC: 	 100 kA
35 – 1200 A
UL Recognized
CSA Certified

Web Resources
For additional information, visit: littelfuse.com/la50qs

5
Semiconductor Fuses

AMPERE
RATING

Dimensions

Dimensions for reference only.
AMPERE
RATING

MOUNTING
TYPE

35 – 100

4

125 – 200

4

225 – 400

4

450 – 600

4

700 – 800

4

900 – 1200

4

A
3.63
(92.2)
3.63
(92.2)
4.34
(110)
4.47
(114)
6.47
(164.3)
6.97
(177.0)

B
1.00
(25.4)
1.22
(31.0)
1.50
(38.1)
2.00
(50.8)
2.50
(63.5)
3.00
(76.2)

DIMENSIONS INCHES (mm)
D
E
2.94
2.75
(74.7)
(69.9)
2.94
2.81
(74.7)
(71.4)
3.41
2.78
(86.6)
(70.6)
3.53
2.91
(89.7)
(73.9)
5.00
3.44
(127.0)
(87.3)
5.47
4.47
(138.9)
(113.5)

C
2.13
(54.1)
2.13
(54.1)
2.09
(53.1)
2.22
(56.4)
2.22
(56.4)
3.22
(81.8)

F
0.31
(7.9)
0.31
(7.9)
0.41
(10.4)
0.41
(10.4)
0.53
(13.5)
0.63
(15.9)

G
0.75
(19.1)
1.00
(25.4)
1.00
(25.4)
1.50
(38.1)
1.50
(38.1)
2.38
(60.3)

H
0.13
(3.3)
0.19
(4.8)
0.25
(6.4)
0.25
(6.4)
0.25
(6.4)
0.44
(11.1)

Contact Littelfuse for characteristic curves.

© 2014 Littelfuse POWR-GARD® Products Catalog

73

littelfuse.com

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
600 Vac/dc • Very Fast-Acting • 5-40 A
LA60Q Series Semiconductor Fuses
AMPERE
RATING

CATALOG
NUMBER

5
8
10
12
15
20
25
30
35
40

LA60Q5-2
LA60Q8-2
LA60Q10-2
LA60Q12-2
LA60Q15-2
LA60Q20-2
LA60Q25-2
LA60Q30-2
LA60Q35-2
LA60Q40-2

MAXIMUM
MOUNTING
CLEARING I2 t
TYPE
@600 VAC (A2s)
2
2
2
2
2
2
2
2
2
2

60
70
110
150
180
330
440
860
1300
1800

Description

WATTS LOSS
@ RATED
CURRENT (W)

Littelfuse LA60Q semiconductor protection fuses feature
a 600 volt ac/dc rating in a compact size (1 1⁄2” x 13 ⁄ 32”).
LA60Q also has the lowest I2t of all similar fuses and
excellent cycling ability. Applications include inverters and
small equipment requiring extremely fast response to
faults, without the need to carry sustained heavy overloads.

0.7
1.1
1.6
2
3
4.4
5.5
5.6
6.4
7

Dimensions Inches
1½

Specifications

5

13/32

Voltage Rating 		
AC: 	 600 V
		
DC: 	 600 V
Interrupting Rating		
AC: 	 200 kA
		
DC: 	 100 kA
Ampere Range		
5 – 40 A
Approvals		
UL Recognized

Web Resources
For additional information, visit: littelfuse.com/la60q

Semiconductor Fuses

Contact Littelfuse for characteristic curves.

690 Vac/700 Vdc • Very Fast-Acting • 10-100 A
LA70QSF Series French Cylindrical Fuses
AMPERE
RATING

CATALOG
NUMBER
(NO STRIKER)

CATALOG
NUMBER
(WITH STRIKER)

BODY
SIZE

10
12
16
20
25
32
40
50
20
25
32
40
50
63
80
100

LA70QS10-14F
LA70QS12-14F
LA70QS16-14F
LA70QS20-14F
LA70QS25-14F
LA70QS32-14F
LA70QS40-14F
LA70QS50-14F
LA70QS20-22F
LA70QS25-22F
LA70QS32-22F
LA70QS40-22F
LA70QS50-22F
LA70QS63-22F
LA70QS80-22F
LA70QS100-22F

LA70QS10-14FI
LA70QS12-14FI
LA70QS16-14FI
LA70QS20-14FI
LA70QS25-14FI
LA70QS32-14FI
LA70QS40-14FI
LA70QS50-14FI
LA70QS20-22FI
LA70QS25-22FI
LA70QS32-22FI
LA70QS40-22FI
LA70QS50-22FI
LA70QS63-22FI
LA70QS80-22FI
LA70QS100-22FI

14 x 51
14 x 51
14 x 51
14 x 51
14 x 51
14 x 51
14 x 51
14 x 51
22 x 58
22 x 58
22 x 58
22 x 58
22 x 58
22 x 58
22 x 58
22 x 58

MAXIMUM
WATTS LOSS
CLEARING I2t
@ RATED
@700 VAC
CURRENT (W)
(A2s X 103)

0.04
0.06
0.10
0.16
0.27
1.50
0.70
1.50
0.076
0.125
0.27
0.48
0.80
1.85
3.80
8.00

Description

3.5
4.4
4.8
5.2
5.8
7.0
10.7
11.6
8.0
10.0
11.0
13.0
14.9
16.0
17.8
19.0

Littelfuse French Cylindrical style semiconductor fuses are
an extension to the LA70QS series.
They offer a solid-fill
B
design with high
interrupting ratings and an optional striker
C
for visual or remote blown fuse indication.

Web Resources
For additional information, visit: littelfuse.com/semi

Dimensions
B
D

littelfuse.com

C

E

Specifications
Voltage Rating 		
		
Interrupting Rating		
		
Ampere Range		
Approvals 		
		

A

FUSE SIZE

AC: 	 690 V
DC:	 700 V
AC: 	 200 kA
DC: 	 100 kA
10 – 100 A
UL Recognized
CSA Certified

14x51
22x58
14x51 Striker
22x58 Striker

74

A

A

B

DIMENSIONS mm
C

D

E

14
22
14
22

51
58
51
58

14
16
14
16

–
–
7.5
7.5

–
–
3.8
3.8

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
700 Vac/dc • Very Fast-Acting • 35-800 A
Description

LA70QS Series Semiconductor Fuses
CATALOG
NUMBER

MOUNTING
TYPE

35
40
50
60
70
80
90
100
125
125
150
150
175
175
200
200
250
300
350
400
450
450
500
500
600
600
700
800

LA70QS35-4
LA70QS40-4
LA70QS50-4
LA70QS60-4
LA70QS70-4
LA70QS80-4
LA70QS90-4
LA70QS100-4
LA70QS125-4
LA70QS125-4K
LA70QS150-4
LA70QS150-4K
LA70QS175-4
LA70QS175-4K
LA70QS200-4
LA70QS200-4K
LA70QS250-4
LA70QS300-4
LA70QS350-4
LA70QS400-4
LA70QS450-4
LA70QS450-4K
LA70QS500-4
LA70QS500-4K
LA70QS600-4
LA70QS600-4K
LA70QS700-4
LA70QS800-4

4
4
4
4
4
4
4
4
4
4K
4
4K
4
4K
4
4
4
4
4
4
4
4K
4
4K
4
4K
4
4

MAXIMUM
CLEARING I2 t
@700 VAC
(A 2s X 10 3)
0.47
0.58
0.86
1.2
1.8
2.3
3
3.6
6.9
6.9
11
11
14
14
19
19
42
55
72
99
125
125
160
160
222
222
332
433

Littelfuse LA70QS semiconductor fuses were developed
to provide improved performance required by today’s new
equipment. The LA70QS features lower I2t, improved cycling,
and lower watts loss. It is the best choice for the protection
of dynamic solid-state equipment.

WATTS LOSS
@ RATED
CURRENT (W)
6.2
7.5
9.8
12
15
18
20
24
22
22
29
29
35
35
41
41
42
53
64
75
78
78
92
92
116
116
125
143

Features/Benefits
•	
•	
•	
•	
•	

I2t improved protection of equipment.
Superior cycling ability for long, reliable life on high
cycling loading.
Lower watts loss for cooler operation.
700 Volt ac/dc rating provides greater design versatility
Compact sizes allow downsizing of equipment

Specifications
Voltage Rating 		
		
Interrupting Rating		
		
Ampere Range		
Approvals 		
		

AC: 	 700 V
DC:	 700 V
AC: 	 200 kA
DC: 	 100 kA
35 – 800 A
UL Recognized
CSA Certified

5

Web Resources
For additional information, visit: littelfuse.com/la70qs

Dimensions

Dimensions for reference only.

AMPERES

MOUNTING
TYPE

35 – 100
125 – 200
125 – 200
225 – 400
450 – 600
450 – 600
700 – 800

4
4
4K
4
4
4K
4

A
4.38 (111)
4.38 (111)
5.09 (129)
5.09 (129)
5.09 (129)
7.09 (180)
7.09 (180)

B
1.00 (25.4)
1.22 (31.0)
1.22 (31.0)
1.50 (38.1)
2.00 (50.8)
2.00 (50.8)
2.50 (63.5)

DIMENSIONS INCHES (mm)
D
E
3.69 (93.6)
3.50 (88.9)
3.69 (93.6)
3.56 (90.5)
4.19 (106)
3.50 (88)
4.16 (106)
3.53 (89.7)
4.16 (106)
3.53 (89.7)
6.16 (156)
3.53 (89.7)
5.28 (134)
4.91 (125)

C
2.88 (73)
2.88 (73)
2.88 (73)
2.84 (72.2)
2.84 (72.2)
2.84 (72.2)
2.84 (72.2)

F
0.31 (7.9)
0.31 (7.9)
0.41 (10.3)
0.40 (10.3)
0.41 (10.3)
0.53 (13.5)
0.53 (13.5)

G
0.75 (19.0)
1.00 (25.4)
1.00 (25.4)
1.50 (38.1)
1.50 (38.1)
1.50 (38.1)
2.00 (50.8)

H
0.13 (3.2)
0.19 (4.8)
0.19 (4.8)
0.25 (6.4)
0.25 (6.4)
0.25 (6.4)
0.38 (9.5)

Contact Littelfuse for characteristic curves.

© 2014 Littelfuse POWR-GARD® Products Catalog

75

littelfuse.com

Semiconductor Fuses

AMPERE
RATING

Fuses – Semiconductor

ALTERNATE DIMENSION SEMICONDUCTOR FUSES
1000 Vac • Very Fast-Acting • 15-1000 A
LA100P Series Semiconductor Fuses

Semiconductor Fuses

5

AMPERE
RATING

CATALOG
NUMBER

MOUNTING
TYPE

15
20
25
30
35
40
50
60
80
100
125
150
200
225
250
300
350
400
500
600
650
700
800
1000

LA100P15-1
LA100P20-1
LA100P25-1
LA100P30-1
LA100P35-4
LA100P40-4
LA100P50-4
LA100P60-4
LA100P80-4
LA100P100-4
LA100P125-4
LA100P150-4
LA100P200-4
LA100P225-4
LA100P250-4
LA100P300-4
LA100P350-4
LA100P400-4
LA100P500-4
LA100P600-4
LA100P650-4
LA100P700-4
LA100P800-4
LA100P1000-4

1
1
1
1
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4

MAXIMUM
CLEARING I2 t
@1000 Vac
(A 2s X 10 3)
0.6
0.8
1,3
1.5
2.2
2.9
4.5
6.5
12
18
28
41
72
91
110
160
220
290
450
650
780
880
1200
1900

Description
Littelfuse LA100P semiconductor protection fuses are
rated 1000 Vac, extending the range of protection for UPS
systems, AC and DC drives, reduced voltage motor starters
and similar applications where lower I2t and superior
reliability are needed. With ratings from 15-1000 amperes, a
wide range of high voltage applications can be served.

WATTS LOSS
@ RATED
CURRENT (W)
3.4
5.9
9
12.8
7.3
8.3
11
13
14
18
23
28
36
40
46
55
65
70
90
110
120
125
140
190

Features/Benefits
•	
•	

Low I2t minimizes damage to protected components
on short-circuit.
Controlled arc voltage reduces stress to circuit
components during fuse clearing.

Specifications
Voltage Rating 		
AC: 	 1000 V
		
DC:	 750 V
Interrupting Rating		
100 kA
Ampere Range		
15 – 1000 A
Approvals		
UL Recognized

Web Resources
For additional information, visit: littelfuse.com/la100p

Dimensions
Figure 1

Figure 2

Figure 3

Figure 4

Dimensions for reference only.

FIGURE
AMPERES MOUNTING
TYPE
NO.
15 – 30
35 – 60
65 – 100
125 – 200
225 – 400
500 – 600
650 – 800
1000

1
4
4
4
4
4
4
4

1
2
2
2
2
2
3
4

A
2.53 (66.8)
5.00 (127)
5.00 (127)
5.72 (145)
5.72 (145)
7.72 (196)
7.44 (189)
8.22 (209)

B
0.56 (14.2)
1.00 (25.4)
1.22 (31)
1.50 (38.1)
2.00 (50.8)
2.50 (63.5)
2.88 (73.2)
3.50 (88.9)

C

DIMENSIONS INCHES (mm)
D
E
F

G

H

J

–

–

–

–

–

–

–

3.50 (88.9)
3.50 (88.9)
3.47 (88.1)
3.47 (88.1)
3.47 (88.1)
3.94 (100)
4.47 (114)

4.31 (109)
4.31 (109)
4.78 (121)
4.78 (121)
5.88 (149)
5.94 (151)
6.59 (167)

4.19 (106)
4.19 (106)
4.16 (106)
4.16 (106)
5.56 (147)

0.31 (7.9)
0.31 (7.9)
0.41 (10.4)
0.41 (10.4)
0.53 (13.5)
0.63 (16)
0.63 (16)

0.75 (19.1)
1.00 (25.4)
1.00 (25.4)
1.50 (25.4)
2.00 (50.8)
2.00 (50.8)
2.75 (69.9)

0.13 (3.3)
0.19 (4.8)
0.25 (6.4)
0.25 (6.4)
0.38 (9.7)
0.38 (9.7)
0.50 (12.7)

–

–

5.84 (148)

–
–
–
–

0.31 (7.9)
1.38 (35.1)

Optional Trigger Indicator (TI) for 50 A - 1000 A available
Contact Littelfuse for characteristic curves.

littelfuse.com

76

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

SQUARE BODY SEMICONDUCTOR FUSES
700/1300 Vac • Very Fast-Acting • 63-2500 A
Description
Littelfuse North American style square body semiconductor
fuses provide maximum flexibility in equipment design and
ultimate protection for today’s power conversion equipment.
Available in different body sizes and multiple mounting
styles, the broad range of ampere ratings allows great
flexibility in equipment design.
Engineered to provide state-of-the-art protection for SCRs,
diodes, thyristors, GTOs, and IGBT devices, Littelfuse
square body fuses have pure die-cut elements embedded in
solidified sand to control arcing and lower I2t. All fuses are
also equipped with a blown fuse trip indicator.

Features
•	 Choice of mounting styles provides a wide choice for
equipment design.
•	 Broad range of ampere ratings in a given body size for
design flexibility.
•	 Very low I2t minimizes damage to protected components.

Ordering Information
LA 070 URD 31 LI 350

•	 Extremely fast-acting and current-limiting for improved
protection to equipment.

Littelfuse

Applications
Protection of rectifiers, inverters, DC drives, UPS systems,
reduced voltage motor starters, and other equipment in
globally accepted applications.

Voltage
070=700 V
130=1300 V

Class

Specifications

Size
700 V
30
31
32
33

Voltage Rating 		
AC: 	 700 V (LA070)
				 1300 V (LA130)
		
DC: 	 Contact factory
Interrupting Rating 	
AC:	 200 kA (LA070)
				 100 kA (LA130)
		
DC: 	 Contact factory
Ampere Range		
63 – 2500 A
Approvals		
UL Recognized Component

1300 V
70
71
72
73

Mounting Type

Straight-blade	
Straight-blade	
Flat-type, one hole	

KI	LI
LI	LLI
TTI	 TTI

Dimensions
Please refer to the Square Body dimensions................ 79-81

Amp Rating

Web Resources
For additional information, visit: littelfuse.com/la070

© 2014 Littelfuse POWR-GARD® Products Catalog

77

littelfuse.com

Semiconductor Fuses

•	 Superior cycling ability for long, reliable life on high
cyclic loading.

5

Fuses – Semiconductor

SQUARE BODY SEMICONDUCTOR FUSES
700/1300 Vac • Very Fast-Acting • 63-2500 A

BODY
SIZE

AMPERE
RATING

RATED
VOLTAGE

MELTING I2 T
(A 2S X 10 3)

63
80
100
125
160
200
250
315
350
400
450
500
550
200
250
315
350
400
450
500
550
630
700
800
400
450
500
550
630
700
800
900
1000
1100
1250
1400
1600
1800
500
550
630
700
800
900
1000
1100
1250
1400
1600
1800
2000
2250
2500

700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
700
650
600
550
550
500
700
700
700
700
700
700
700
700
700
700
650
650
600
550
500

0.2
0.33
0.47
0.85
1.6
3
5.8
12
15.5
23
26
41
52
2.5
4.7
7.5
10.5
19
26.5
37
52
75
95
140
15
22
28
37
54
76
115
170
240
270
410
555
870
1050
19
27
40
55
95
135
170
240
350
480
555
720
950
1250
1870

5

31

Semiconductor Fuses

30

32

33

TOTAL I2 T *WATTS LOSS
LONG BLADE
@ RATED
@ RATED
CATALOG NUMBER
CURRENT
VOLTAGE
TYPE LI
(W)
(A 2S X 10 3)
1.2
1.9
2.7
4.9
9.2
16.7
32.4
67
86
130
165
264
330
14.6
27
43
59
110
150
210
300
421
530
880
86
124
157
211
302
432
648
972
1350
1620
2100
2600
4000
4400
108
151
227
324
529
760
970
1360
2000
2700
3250
4330
5000
5900
7600

14
19
26
30
37
42 ⁄ 43
48 ⁄ 50
53 ⁄ 55
57 ⁄ 60
60 ⁄ 65
80 ⁄ 88
80 ⁄ 88
80 ⁄ 90
45
52
65
67
68
70
70 ⁄ 72
70 ⁄ 75
75 ⁄ 85
85 ⁄ 95
105 ⁄ 120
72 ⁄ 75
77 ⁄ 80
85 ⁄ 90
90 ⁄ 95
95 ⁄ 105
100 ⁄ 110
110 ⁄ 120
110 ⁄ 125
115 ⁄ 135
140 ⁄ 165
150 ⁄ 180
160 ⁄ 190
165 ⁄ 195
195 ⁄ 330
105
105 ⁄ 110
110 ⁄ 120
115 ⁄ 125
120 ⁄ 130
120 ⁄ 135
135 ⁄ 155
135 ⁄ 160
150 ⁄ 180
160 ⁄ 200
210 ⁄ 240
225 ⁄ 260
250 ⁄ 290
280 ⁄ 330
280 ⁄ 330

LA070URD30LI0063
LA070URD30LI0080
LA070URD30LI0100
LA070URD30LI0125
–
LA070URD30LI0200
LA070URD30LI0250
LA070URD30LI0315
LA070URD30LI0350
LA070URD30LI0400
LA070URD30LI0450
LA070URD30LI0500
LA070URD30LI0550
LA070URD31LI0200
LA070URD31LI0250
LA070URD31LI0315
LA070URD31LI0350
LA070URD31LI0400
LA070URD31LI0450
LA070URD31LI0500
LA070URD31LI0550
LA070URD31LI0630
LA070URD31LI0700
LA070URD31LI0800
LA070URD32LI0400
LA070URD32LI0450
LA070URD32LI0500
LA070URD32LI0550
LA070URD32LI0630
LA070URD32LI0700
LA070URD32LI0800
LA070URD32LI0900
LA070URD32LI1000
LA065URD32LI1100
LA060URD32LI1250
LA055URD32LI1400
LA055URD32LI1600
LA050URD32LI1800
LA070URD33LI0500
LA070URD33LI0550
LA070URD33LI0630
LA070URD33LI0700
LA070URD33LI0800
LA070URD33LI0900
LA070URD33LI1000
LA070URD33LI1100
LA070URD33LI1250
LA070URD33LI1400
LA065URD33LI1600
LA065URD33LI1800
LA060URD33LI2000
LA055URD33LI2250
LA050URD33LI2500

SHORT BLADE
CATALOG NUMBER
TYPE KI

TAPPED TERMINAL
CATALOG NUMBER
TYPE TTI

LA070URD30KI0063
LA070URD30KI0080
LA070URD30KI0100
LA070URD30KI0125
LA070URD30KI0160
LA070URD30KI0200
LA070URD30KI0250
LA070URD30KI0315
LA070URD30KI0350
LA070URD30KI0400
LA070URD30KI0450
LA070URD30KI0500
LA070URD30KI0550
LA070URD31KI0200
LA070URD31KI0250
LA070URD31KI0315
LA070URD31KI0350
LA070URD31KI0400
LA070URD31KI0450
LA070URD31KI0500
LA070URD31KI0550
LA070URD31KI0630
LA070URD31KI0700
LA070URD31KI0800
LA070URD32KI0400
LA070URD32KI0450
LA070URD32KI0500
LA070URD32KI0550
LA070URD32KI0630
LA070URD32KI0700
LA070URD32KI0800
LA070URD32KI0900
LA070URD32KI1000
–
–
–
–
–
LA070URD33KI0500
LA070URD33KI0550
LA070URD33KI0630
LA070URD33KI0700
LA070URD33KI0800
LA070URD33KI0900
LA070URD33KI1000
LA070URD33KI1100
LA070URD33KI1250
LA070URD33KI1400
–
–
–
–
–

LA070URD30TTI0063
LA070URD30TTI0080
LA070URD30TTI0100
LA070URD30TTI0125
LA070URD30TTI0160
LA070URD30TTI0200
LA070URD30TTI0250
LA070URD30TTI0315
LA070URD30TTI0350
LA070URD30TTI0400
LA070URD30TTI0450
LA070URD30TTI0500
LA070URD30TTI0550
LA070URD31TTI0200
LA070URD31TTI0250
LA070URD31TTI0315
LA070URD31TTI0350
LA070URD31TTI0400
LA070URD31TTI0450
LA070URD31TTI0500
LA070URD31TTI0550
LA070URD31TTI0630
LA070URD31TTI0700
LA070URD31TTI0800
LA070URD32TTI0400
LA070URD32TTI0450
LA070URD32TTI0500
LA070URD32TTI0550
LA070URD32TTI0630
LA070URD32TTI0700
LA070URD32TTI0800
LA070URD32TTI0900
LA070URD32TTI1000
LA065URD32TTI1100
LA060URD32TTI1250
LA055URD32TTI1400
LA055URD32TTI1600
LA050URD32TTI1800
LA070URD33TTI0500
LA070URD33TTI0550
LA070URD33TTI0630
LA070URD33TTI0700
LA070URD33TTI0800
LA070URD33TTI0900
LA070URD33TTI1000
LA070URD33TTI1100
LA070URD33TTI1250
LA070URD33TTI1400
LA065URD33TTI1600
LA065URD33TTI1800
LA060URD33TTI2000
LA055URD33TTI2250
LA050URD33TTI2500

*Watts loss data is published for both blade and tapped style mounting configurations.
When two watts loss values are shown, this represents tapped/blade values respectively.
Contact Littelfuse for characteristic curves.

littelfuse.com

78

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

SQUARE BODY SEMICONDUCTOR FUSES
700/1300 Vac • Very Fast-Acting • 63-2500 A
TYPES KI AND LI

North American Straight Blade, Type KI

Dimensions

Dimensions for reference only.

A
1.57
(40)

B
0.98
(25)

DIMENSIONS INCHES (mm)
C
D
E
F
G
0.49
0.83
0.71
2.68
4.21
(12.5)
(21)
(18)
(68)
(107)

LA070URD31KI (200-800)

2.01
(51)

0.98
(25)

0.49
(12.5)

1.0
(25.5)

0.89
(22.5)

2.66
(67.6)

LA070URD32KI (400-1000)

2.36
(60)

1.26
(32)

0.63
(16)

1.18
(30)

1.06
(27)

LA070URD33KI (500-1400)

2.93
(74.5)

1.57
(40)

0.79
(20)

1.46
(37.2)

1.35
(34.2)

CATALOG NUMBER
LA070URD30KI (63-550)

H
5.08
(129)

J
0.41
(10.5)

4.22
(107.1)

5.07
(128.8)

0.56
(14.3)

2.92
(74.2)

4.29
(109)

5.28
(134)

0.57
(14.6)

2.97
(75.4)

4.24
(107.6)

5.28
(134)

0.63
(15.9)

North American Straight Blade, Type LI

Dimensions

Dimensions for reference only.

B
0.98
(25)

2.01
(51)

0.98
(25)

0.49
(12.5)

1.0
(25.5)

0.89
(22.5)

3.61
(91.6)

2.36
(60)

1.26
(32)

0.63
(16)

1.18
(30)

1.06
(27)

3.71
(94.2)

5.08
(129)

6.02
(153)

0.57
(14.6)

2.93
(74.5)

1.57
(40)

0.79
(20)

1.46
(37.2)

1.35
(34.2)

3.72
(94.4)

4.98
(126.6)

6.02
(153)

0.63
(15.9)

CATALOG NUMBER
LA070URD30LI (63-550)
LA070URD31LI (200-800)
LA070URD32LI (400-1000)
LA060URD32LI (1250)
LA055URD32LI (1400-1600)
LA050URD32LI (1800)
LA070URD33LI (500-1400)
LA065URD33LI (1600-1800)
LA060URD33LI (2000)
LA055URD33LI (2250)
LA050URD33LI (2500)

TYPE TTI

0.57
(14.6)

North American Flat Single Hole, Type TTI

Dimensions

Dimensions for reference only.

CATALOG NUMBER
LA070URD30TTI (100-550)
LA070URD31TTI (200-800)
LA070URD32TTI (400-1000)
LA065URD32TTI (1100)
LA060URD32TTI (1250)
LA055URD32TTI (1400-1600)
LA060URD33TTI (1800)
LA070URD33TTI (500-1400)
LA065URD33TTI (1600)
LA060URD33TTI (2000)
LA055URD33TTI (2250)
LA050URD33TTI (2500)

© 2014 Littelfuse POWR-GARD® Products Catalog

4.82
5.85
(122.4) (148.6)

J
0.41
(10.5)

79

A
1.57
(40)

DIMENSIONS INCHES (mm)
B
C
1.00
5 16
⁄ -18 x 0.35
(25)

2.00
(50.8)

1.19
(30.2)

5 16

2.37
(60.3)

1.50
(38.1)

3 8

2.94
(74.5)

1.81
(46)

12

⁄ -18 x 0.35

⁄ -16 x 0.35

⁄ -18 x 0.35

littelfuse.com

5
Semiconductor Fuses

A
1.57
(40)

DIMENSIONS INCHES (mm)
C
D
E
F
G
H
0.49
0.83
0.71
3.45
4.98
5.85
(12.5)
(21)
(18)
(87.6) (126.6) (148.6)

Fuses – Semiconductor

SQUARE BODY SEMICONDUCTOR FUSES
700/1300 Vac • Very Fast-Acting • 63-2500 A

BODY
SIZE

AMPERE
RATING

RATED
VOLTAGE

MELTING I2 T
(A 2S X 10 3)

63
80
100
125
160
200
250
315
350
160
200
250
280
315
350
400
450
500
550
630
630
280
315
350
400
450
500
550
630
630
700
700
800
800
315
350
400
450
500
550
630
700
800
800
900
900
1000
1100
1250
1400
1600
1800

1300
1300
1300
1300
1300
1300
1300
1300
1200
1300
1300
1300
1300
1300
1300
1300
1300
1200
1200
1100
1200
1300
1300
1300
1300
1300
1300
1300
1200
1300
1100
1200
1100
1200
1300
1300
1300
1300
1300
1300
1300
1300
1200
1300
1100
1000
1000
1000
1000
900
700
660

0.21
0.47
0.83
1.3
2.5
4.7
9.6
20
28
2.6
4.7
8.9
12
16
22
38
47
68
84
125
125
10
15
21
32
44
57
68
105
105
145
145
215
215
12
17
25
35
44
57
84
110
190
190
250
250
370
445
585
755
1430
2040

70

71

Semiconductor Fuses

5

72

73

TOTAL I2 T
@ RATED
VOLTAGE
(A 2S X 10 3)
1.8
4
7.2
11
22
40
82
172
205
22
40
76
102
138
190
330
405
500
620
930
930
90
130
180
285
380
500
590
920
920
1040
1040
1590
1590
102
150
220
310
390
500
730
960
1630
1630
2160
2160
2430
2580
3480
3880
5630
7600

*WATTS LOSS @
RATED CURRENT
(W)

LONG BLADE
CATALOG NUMBER
TYPE LI/LLI

TAPPED TERMINAL
CATALOG NUMBER
TYPE TTI

26
27
30
38
45
54 ⁄ 56
58 ⁄ 61
66 ⁄ 72
68 ⁄ 75
46
54
61
68 ⁄ 70
73 ⁄ 76
76 ⁄ 80
76 ⁄ 80
87 ⁄ 95
90 ⁄ 100
98 ⁄ 112
105
120
72
76
77
80
87 ⁄ 89
94 ⁄ 98
110 ⁄ 120
113
125
122
140
125
146
84
86
93
99 ⁄ 100
110 ⁄ 112
116 ⁄ 120
125 ⁄ 132
135 ⁄ 146
136
148
150
170
152 ⁄ 174
168 ⁄ 208
186 ⁄ 200
210 ⁄ 228
203
206

LA130URD70LI0063
LA130URD70LI0080
LA130URD70LI0100
LA130URD70LI0125
LA130URD70LI0160
LA130URD70LI0200
LA130URD70LI0250
LA130URD70LI0315
LA120URD70LI0350
LA130URD71LLI0160
LA130URD71LLI0200
LA130URD71LLI0250
LA130URD71IL0280
LA130URD71LLI0315
LA130URD71LLI0350
LA130URD71LLI0400
LA130URD71LLI0450
LA120URD71LLI0500
LA120URD71LLI0550
LA110URD71LLI0630
–
LA130URD72LI0280
LA130URD72LI0315
LA130URD72LI0350
LA130URD72LI0400
LA130URD72LI0450
LA130URD72LI0500
LA130URD72LI0550
LA120URD72LI0630
–
LA110URD72LI0700
–
LA110URD72LI0800
–
LA130URD73LI0315
LA130URD73LI0350
LA130URD73LI0400
LA130URD73LI0450
LA130URD73LI0500
LA130URD73LI0550
LA130URD73LI0630
LA130URD73LI0700
LA120URD73LI0800
–
LA110URD73LI0900
–
LA100URD73LI1000
LA100URD73LI1100
LA100URD73LI1250
LA090URD73LI1400
LA070URD73LI1600
LA065URD73LI1800

LA130URD70TTI0063
LA130URD70TTI0080
LA130URD70TTI0100
LA130URD70TTI0125
LA130URD70TTI0160
LA130URD70TTI0200
LA130URD70TTI0250
LA130URD70TTI0315
LA120URD70TTI0350
LA130URDT1TTI0160
LA130URD71TTI0200
LA130URD71TTI0250
LA130URD71TTI0280
LA130URD71TTI0315
LA130URD71TTI0350
LA130URD71TTI0400
LA130URD71TTI0450
LA120URD71TTI0500
LA120URD71TTI0550
–
LA120URD71TTI0630
LA130URD72TTI0280
LA130URD72TTI0315
LA130URD72TTI0350
LA130URD72TTI0400
LA130URD72TTI0450
LA130URD72TTI0500
LA130URD72TTI0550
–
LA130URD72TTI0630
–
LA120URD72TTI0700
–
LA120URD72TTI0800
LA130URD73TTI0315
LA130URD73TTI0350
LA130URD73TTI0400
LA130URD73TTI0450
LA130URD73TTI0500
LA130URD73TTI0550
LA130URD73TTI0630
LA130URD73TTI0700
–
LA130URD73TTI0800
–
LA100URD73TTI0900
LA100URD73TTI1000
LA100URD73TTI1100
LA100URD73TTI1250
LA090URD73TTI1400
LA070URD73TTI1600
LA065URD73TTI1800

*Watts loss data is published for both blade and tapped style mounting configurations. When two watts loss values are shown, this represents tapped/blade values respectively.
Contact Littelfuse for characteristic curves.

littelfuse.com

80

© 2014 Littelfuse POWR-GARD® Products Catalog

Fuses – Semiconductor

SQUARE BODY SEMICONDUCTOR FUSES
700/1300 Vac • Very Fast-Acting • 63-2500 A

TYPES LI AND LLI

North American Straight Blade, Types LI and LLI

Dimensions
CATALOG NUMBER

A

B

C

D

E

F

G

H

J

1.57
(40)

0.98
(25)

0.49
(12.5)

0.83
(21)

0.71
(18)

3.60
(91.4)

5.13
(130.4)

6.00
(152.4)

0.41
(10.5)

2.01
(51)

0.98
(25)

0.49
(12.5)

1.0
(26.5)

0.89
(22.5)

3.60
(91.4)

5.13
(130.4)

6.00
(152.4)

0.57
(14.6)

2.36
(60)

1.26
(32)

0.63
(16)

1.18
(30)

1.06
(27)

3.84
(97.6)

5.2
(132.4)

6.20
(157.4)

0.57
(14.6)

2.93
(74.5)

1.57
(40)

0.79
(20)

1.46
(37.2)

1.35
(34.2)

3.89
(98.8)

5.21
(132.4)

6.20
(157.4)

0.63
(15.9)

North American Flat Single Hole, Type TTI

Dimensions
CATALOG NUMBER
LA130URD70TTI (63-315)
LA120URD70TTI (350)
LA130URD71TTI (160-450)
LA120URD71TTI (550-630)
LA130URD72TTI (280-630)
LA120URD72TTI (700-800)
LA130URD73TTI (315-900)
LA120URD73TTI (1000)
LA110URD73TTI (1250)
LA090URD73TTI (1400)
LA070URD73TTI (1600)
LA065URD73TTI (1800)

Dimensions for reference only.

DIMENSIONS INCHES (mm)
A
B
C
1.57
1.00
5 16
⁄ -18 x 0.23 DP
(40)
(26.4)
2.01
(51)

1.19
(30.2)

5 16

2.36
(60)

1.50
(38.1)

3 8

2.93
(74.5)

1.81
(46)

12

© 2014 Littelfuse POWR-GARD® Products Catalog

TYPE TTI

⁄ -18 x 0.36 DP
⁄ -18 x 0.36 DP

⁄ -18 x 0.36 DP

81

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5
Semiconductor Fuses

LA130URD70LI (63-315)
LA120URD70LI (350)
LA130URD71LLI (160-450)
LA120URD71LLI (500-550)
LA110URD71LLI (630)
LA130URD72LI (280-550)
LA120URD72LI (800)
LA110URD72LI (700-800)
LA130URD73LI (315-700)
LA120URD73LI (800)
LA110URD73LI (900-1000)
LA090URD73LI (1400)
LA070URD73LI (1600)
LA065URD73LI (1800)

Dimensions for reference only.

DIMENSIONS INCHES (mm)

Section Overview
Littelfuse® offers a wide variety of open-face and dead-front fuse blocks,
in addition to a variety of in-line fuse holders, distribution/splicer blocks,
fuse pullers and accessories.

BLOCKS AND HOLDERS
Table of Contents
LF Series Fuse Blocks Overview...................................................83
Class J Fuse Blocks........................................................................85
Class H / K5 and R Fuse Blocks......................................................88
Class T Fuse Blocks.......................................................................94
Class G Fuse Blocks.......................................................................99
Class CC / CD and Midget Fuse Blocks........................................101
LF Series Fuse Block Covers.......................................................105
Solar Rated Fuse Blocks..............................................................106
Dead Front Fuse Holders.............................................................109
Miscellaneous Fuse Blocks and Holders..................................... 116
Semiconductor Fuse Blocks.........................................................120
Distribution and Splicer Blocks....................................................122
In-Line Fuse Holders....................................................................132

littelfuse.com

82

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

FUSE BLOCK OVERVIEW
5. Select the type of wire termination
Three types of wire termination are available:
•	 Screw*—for use with spade lugs or ring terminals
•	 Screw with Pressure Plate*—for use with solid or
stranded wire without terminal. Recommended where
vibration will be a factor
•	 Box Lug—for use with all types of solid wire and
Class B and Class C stranded wire. The most durable, but
not for use with welding cable or other
rope-stranded conductors.
*1⁄4” Quick Connect terminals rated for up to 20 amperes are
available on the Midget and Class CC fuse blocks.

Description
Littelfuse offers a comprehensive line of fuse blocks
that incorporate many benefits such as indication, snap torelease, DIN-Rail mounting and universal mounting holes.

New Options Available

Screw
with
Pressure
Plate
(P)

•	 Reduced Footprint—Save space with
designs up to 35% smaller in width
•	 Indication—Increase safety and reduce
downtime with built-in local indication

Box
Lug
(C)

6. Decide on the number of poles in each block—The
number of poles for each set of fuses is determined by the
characteristics of the circuit.

•	 Universal Mounting Holes—Simplify
replacement with universal mounting options

7. Determine if block should be DIN Rail mounted—Many
of the new Littelfuse fuse blocks are DIN Rail mountable. Be
sure to look to corresponding ordering tables to match the
correct part number on the following product pages.

•	 One-Hand Release—Save time by using only
one hand for a simple release from DIN Rail

Fuse Block Selection

8. Determine if fuse clips need to be re­in­forced
Fuse clips may have a tendency to lose some of their tension
over a period of time. This may be prevented by specifying
reinforced fuse clips.

The following guidelines should help simplify the selection
of proper fuse blocks:
1. Determine the system voltage—Since fuses are
selected on the basis of sys­tem voltage, fuse blocks are
selected to match the voltage rating of the fuse.

Ordering Information
The Littelfuse fuse block part number con­sists of the below skeleton.
Please refer to UL Class Tables for specific information.

2. Determine the design short-circuit current—If available
short-circuit current cannot be determined, or if it will vary
with equip­ment location, select fuses with a 200,000 ampere
interrupting rating (A.I.R.) and mating fuse blocks with a
withstand rating of 200,000 amperes for maximum safety.
3. Determine the type and ampere rating of the fuse
to be used—The fuse ampere rating, opening characteristics
(fast acting or time-delay) and size are important considerations
in fuse selection. Fuse blocks may be used with a fuse rated
at the corresponding amperage rating or below. For example,
a fuse block rated at 30 amperes may be used with a fuse
rated from 0 to 30 amperes.

†For all Class R, H, J, G

and T Fuse blocks

For all Class CC,
and Midget-Style

†T hese new fuse blocks replace previous Littelfuse fuse blocks that had very similar
part numbers for customer convenience. The only change is an “F” has been added as
the second character in the new block part numbers.

4. Determine if NEC®, CSA, UL, or other requirements
are applicable—Any of these requirements should be
obtained from the approving agency in advance of fuse and
fuse block selection.

Caution: Littelfuse indicating fuse blocks are intended to quickly identify open fuses
while power is still applied. Only qualified electrically trained technicians should
replace fuses and follow standard OSHA and NFPA 70E safe work practices, such
as Lock-Out and Tag-Out procedures and verification before replacing any fuses in
indicating fuse blocks.

83

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6
Fuse Blocks and Holders

•	 DIN Rail Mountable—Ease installation with
a 35 mm hat DIN Rail mounting option

© 2014 Littelfuse POWR-GARD® Products Catalog

Screw
(S)

Blocks and Holders

LF SERIES INDICATING FUSE BLOCKS

Fuse Blocks and Holders

6

Smaller Footprint
Provides Space Savings

An Indication of Value
The Littelfuse LF Series Fuse Blocks and Covers offer
generous space savings and a greater value over previous
generations. View the different series classes for available
indication, snap-to-release DIN rail mounting, universal
mounting holes and touch-safe covers.

DIN-Rail Mounting
Eases Installation
Indication Improves
Functionality

littelfuse.com

84

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LF SERIES CLASS J FUSE BLOCKS
600 V

Specifications
Voltage Ratings		
Ampere Ratings		
Leakage Current	
Flammability Rating		
Approvals		
		
Environmental	

600 V
0 – 600 A
<0.6 mA at 600 V
UL94 V-0
UL Listed (File: E14721)
CSA Certified (File: LR7316)
RoHS Compliant, Lead (Pb) Free

Description

Recommended Fuses

The Littelfuse 600 V Class J blocks offer generous space
savings and enhanced value over previous generations,
such as indication, snap-to-release DIN rail mounting and
universal mounting holes.

Time Delay
Series: JTD_ID.................................................................... 21
Series: JTD......................................................................... 21
Fast Acting
Series: JLS.......................................................................... 22

Features/Benefits

Web Resources

Space-saving design – up to 45% smaller
Universal mounting holes for easy replacement
Indication offered on all versions except 200–600 A
One hand release from DIN rail for ferrule style fuses
Reinforced fuse clips are standard on all Class J blocks
Covers available for up to 100 A to enhance safety

Download CAD drawings, fuse block cover datasheet and
other technical information:
littelfuse.com/lfj

60

1
2
3
1
2
3

LFJ600301
LFJ600302
LFJ600303
LFJ600601
LFJ600602
LFJ600603

CID
CID
CID
CID
CID
CID

PID
PID
PID
—
—
—

SID
SID
SID
—
—
—

1

LFJ601001

CID

—

—

100

200
400
600

3

LFJ601003

CID

—

—

1
3
1
3
1
3

LFJ602001
LFJ602003
LFJ604001
LFJ604003
LFJ606001
LFJ606003

C
C
C
C
C
C

—
—
—
—
—
—

—
—
—
—
—
—

TORQUE

2.8 N-m (25 in-lbs)

C
P
S

BASE DIN
WIRE RANGE WIRE TYPE TEMP RAIL
RATING
6-14 AWG
10-14 AWG
10-22 AWG

COVER
ORDERING
NUMBER*

CU Only

125˚C

•

• LFJ60030FBC

CU-AL

125˚C

•

• LFJ60060FBC

130˚C

—

•

LFJ60100FBC

5.6 N-m (50 in-lbs)

2-4 AWG

2.8 N-m (25 in-lbs)

6-14 AWG

13.6 N-m (120 in-lbs)

2/0-6 AWG

4.5 N-m (40 in-lbs)

8 AWG

4.0 N-m (35 in-lbs)

10-14 AWG

31.1 N-m (275 in-lbs)

250 kcmil-6

CU-AL

130˚C

—

—

—

31.1 N-m (275 in-lbs)

(2) 350 kcmil-1/0

CU-AL

130˚C

—

—

—

42.4 N-m (375 in-lbs)

(2) 500 kcmil-4

CU-AL

130˚C

—

—

—

CU-AL

Solid / Stranded

30

TERMINAL SUFFIX
BASE
PART
PRES­SURE
NUMBER BOX LUG PLATE SCREW

TERMINAL

AMP
RATING

POLES

ORDERING NUMBER

INDICATION

Ordering Information (Class J 600 V)

Note: Reinforcing springs standard on all Class J fuse blocks.
*Covers sold individually. One cover needed for each pole.

© 2014 Littelfuse POWR-GARD® Products Catalog

85

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6
Fuse Blocks and Holders

•	
•	
•	
•	
•	
•	

Blocks and Holders

CLASS J FUSE BLOCK DIMENSIONS
Dimensions mm (inches)
600 V 30 A
29.2 (1.15)
21.8 (.86)
21.4 (.84)
12.5 (.49)
7.4 (.29)

56.5
(2.23)

43.2
(1.70)

94.1
(3.70)

39.2 (1.54)
34.0 (1.34)

55.9 (2.20)

82.5 (3.25)

49.5 (1.95)

Ø.2 THRU
Ø.4 .2
R2.8 (.11)
TYP.

3.6 (.14)

600 V 60 A
81.2 (3.20)

42.4 (1.67)
32.9 (1.30)
22.5 (.89)
12.0 (.47)

Fuse Blocks and Holders

6

119.9 (4.72)

50.8 (2.00)

89.5 (3.52)

56.9 (2.24)
21.1 (.83)

52.5
(2.07)

97.2
(3.83)

3.6 (.14)

600 V 100 A
48.8 (1.92)
37.1 (1.46)
11.7 (.46)
5.3 (.21)

72.5 (2.86)

138.2 (5.44)

136.1 (5.36)
87.1 (3.43)
49.0 (1.93)
17.3 (.68)

66.5 (2.62)
21.0 (.83)

72.5 (2.86)
R3.6 (.14)
TYP.
Ø.3 THRU
Ø.5 .6

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© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

CLASS J FUSE BLOCK DIMENSIONS
Dimensions mm (inches)
600 V 200 A
76.2 (3.00)
63.5 (2.50)

12.7 (.50)

203.2 (8.00)
190.5 (7.50)

12.7 (.50)

72.4 (2.85)
15.9 (.63)

56.4 (2.22)

77.9 (3.07)

99.3 (3.91)

155.7 (6.13)

Ø.3 THRU
Ø.8 .4

600 V 400 A
76.2 (3.00)
63.5 (2.50)
60.2 (2.37)
16.0 (.63)
12.7 (.50)

101.6
(4.00)

Ø.3 THRU
Ø.8 .4

146.1
(5.75)
152.4
(6.00)

28.6 (1.13)

15.9 (.63)

101.6 (4.00)

6

152.4 (6.00)

R4.3 (.17)
TYP.

600 V 600 A

84.4 (3.32)

101.6 (4.00)
73.0 (2.88)

Ø.3 THRU
Ø.8 .4

304.8 (12.00)
292.1 (11.50)

12.7 (.50)

Fuse Blocks and Holders

254.0
(10.00)

236.7 (9.32)
194.6 (7.66)

42.2 (1.66)

110.6 (4.36)
15.9 (.63)

119.0 (4.69)
179.5 (7.07)

Ø.3 THRU
Ø.6 .4

298.5 (11.75)

© 2014 Littelfuse POWR-GARD® Products Catalog

87

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Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS
250 V • 600 V

Specifications
Voltage Rating	
250 V, 600 V
Ampere Ratings	
0-600 A
Leakage Current	
<0.6 mA at 600 V
Withstand Rating	Class H: 10 kA RMS SYM
Class R: 200 kA RMS SYM
Flammability Rating	 UL94 V-0
Approvals	
UL Listed (File: E14721)
	
CSA Certified (File: LR7316)
Environmental	
RoHS Compliant, Lead (Pb) Free

Description
The Littelfuse Class R and H/K5 blocks offer many benefits
such as indication, snap-to-release DIN rail mounting
and universal mounting holes. Class H and Class R fuse
blocks are dimensionally the same, but Class R blocks
incorporate a rejection feature, which only allows Class R
fuses to be inserted.

Recommended Fuses
250 – Class R Blocks
LLNRK................................................................................. 13
KLNR................................................................................... 15
FLNR/FLNR_ID.....................................................................17

Features/Benefits
Universal mounting holes for easy replacement
Indication offered on most 250 V and 600 V versions
One hand release from DIN rail for ferrule style fuses
Reinforced fuse clips are standard on all Class H and
Class R fuse blocks
•	 Covers available for 100 A and lower to enhance safety

600 V – Class R Blocks
LLSRK/LLSRK_ID................................................................. 13
KLSR.................................................................................... 15
IDSR.................................................................................... 16
FLSR/FLSR_ID......................................................................17
600 V – Class H / K5 Blocks
NLS...................................................................................... 20

Web Resources
Download CAD drawings, fuse block cover datasheet and
other technical information: littelfuse.com/lfr
littelfuse.com/lfh

30
60
100
200
400
600

ORDERING NUMBER
BASE PART
NUMBER

1
2
3
1
2
3
1

LFH250301
LFH250302
LFH250303
LFH250601
LFH250602
LFH250603
LFH251001

BOX
LUG
C
C
C
CID
CID
CID
CID

3
1
3
1
3
1
3

LFH251003
LFH252001
LFH252003
LFH254001
LFH254003
LFH256001
LFH256003

CID
C
C
C
C
C
C

SUFFIX
TORQUE
PRES­SURE
SCREW
PLATE
P
S
P
S
2.8 N-m (25 in-lbs)
P
S
—
—
5.6 N-m (50 in-lbs)
—
—
2.8 N-m (25 in-lbs)
—
—
13.6
N-m (120 in-lbs)
—
—
4.5 N-m (40 in-lbs)
—
—
4.0 N-m (35 in-lbs)
—
—
31.1 N-m (275 in-lbs)
—
—
—
—
31.1 N-m (275 in-lbs)
—
—
—
—
42.4 N-m (375 in-lbs)
—
—

C
P
S

WIRE
RANGE
6-14 AWG
10-14 AWG
10-22 AWG
2-4 AWG
6-14 AWG
2/0-6 AWG
8 AWG
10-14 AWG

BASE
TEMP
RATING

DIN
RAIL

INDICATION

AMP
RATING

TERMINAL

Ordering Information (Class H 250 V)
POLES

Fuse Blocks and Holders

6

250 V – Class H / K5 Blocks
NLN..................................................................................... 20

•	
•	
•	
•	

COVER
ORDERING
NUMBER*

CU Only

125˚C

•

—

LFH25030FBC

CU-AL

125˚C

•

•

LFH25060FBC

130˚C

—

•

LFH25100FBC

WIRE TYPE

CU-AL

Solid/
Stranded

250 kcmil-6

CU-AL

130˚C

—

—

—

(2) 350 kcmil-1/0

CU-AL

130˚C

—

—

—

(2) 500 kcmil-4

CU-AL

130˚C

—

—

—

Note: Reinforcing springs standard on all Class H fuse blocks.
*Covers sold individually. One cover needed for each pole.

littelfuse.com

88

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS

100
200
400
600

BOX
LUG
CID
CID
CID
CID
CID
CID
CID

3
1
3
1
3
1
3

LFH601003
LFH602001
LFH602003
LFH604001
LFH604003
LFH606001
LFH606003

CID
C
C
C
C
C
C

SUFFIX
PRES­SURE
SCREW
PLATE
PID
SID
PID
SID
PID
SID
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

—
—
—
—
—
—
—

TORQUE

2.8 N-m (25 in-lbs)

C
P
S

WIRE
RANGE

WIRE TYPE

BASE
SNAP
TEMP
TO
RATING RELEASE

COVER
ORDERING
NUMBER*

2.8 N-m (25 in-lbs)
13.6 N-m (120 in-lbs)
4.5 N-m (40 in-lbs)
4.0 N-m (35 in-lbs)

6-14 AWG
10-14 AWG CU Only
10-22 AWG
2-4 AWG
CU-AL
6-14AWG
2/0-6AWG
Solid/
8 AWG
CU-AL
Stranded
10-14 AWG

31.1 N-m (275 in-lbs)

250 kcmil-6

CU-AL

130˚C

—

—

—

31.1 N-m (275 in-lbs)

(2) 350 kcmil-1/0

CU-AL

130˚C

—

—

—

42.4 N-m (375 in-lbs)

(2) 500 kcmil-4

CU-AL

130˚C

—

—

—

INDICATION

60

1
2
3
1
2
3
1

BASE
ORDERING
NUMBER
LFH600301
LFH600302
LFH600303
LFH600601
LFH600602
LFH600603
LFH601001

TERMINAL

30

POLES

ORDERING NUMBER
AMP
RATING

INDICATION

Ordering Information (Class H 600 V)

COVER
ORDERING
NUMBER*

5.6 N-m (50 in-lbs)

130˚C

•

• LFH60030FBC

130˚C

•

• LFH60060FBC

130˚C

—

• LFH60100FBC

Note: Reinforcing springs standard on all Class H fuse blocks.

Ordering Information (Class R 250 V)

200
400
600

3
1
3
1
3
1
3

LFR251003
LFR252001
LFR252003
LFR254001
LFR254003
LFR256001
LFR256003

CID
C
C
C
C
C
C

—
—
—
—
—
—
—

—
—
—
—
—
—
—

TORQUE

2.8 N-m (25 in-lbs)

C
P
S

WIRE
RANGE

WIRE TYPE

BASE
SNAP
TEMP
TO
RATING RELEASE

2.8 N-m (25 in-lbs)
13.6 N-m (120 in-lbs)
4.5 N-m (40 in-lbs)
4.0 N-m (35 in-lbs)

6-14 AWG
10-14 AWG CU Only
10-22 AWG
2-4 AWG
CU-AL
6-14 AWG
2/0-6 AWG
Solid/
8 AWG
CU-AL
Stranded
10-14 AWG

31.1 N-m (275 in-lbs)

250 kcmil-6

CU-AL

130˚C

—

—

—

31.1 N-m (275 in-lbs)

(2) 350 kcmil-1/0

CU-AL

130˚C

—

—

—

42.4 N-m (375 in-lbs)

(2) 500 kcmil-4

CU-AL

130˚C

—

—

—

COVER
ORDERING
NUMBER*

5.6 N-m (50 in-lbs)

125˚C

•

— LFH25030FBC

125˚C

•

• LFH25060FBC

130˚C

—

• LFH25100FBC

Note: Reinforcing springs standard on all Class R fuse blocks.

30
60
100
200
400
600

ORDERING NUMBER
SUFFIX
BOX PRES­SURE
SCREW
PLATE
LUG
CID
PID
SID
CID
PID
SID
CID
PID
SID
CID
—
—
CID
—
—
CID
—
—
CID
—
—

1
2
3
1
2
3
1

BASE
ORDERING
NUMBER
LFR600301
LFR600302
LFR600303
LFR600601
LFR600602
LFR600603
LFR601001

3
1
3
1
3
1
3

LFR601003
LFR602001
LFR602003
LFR604001
LFR604003
LFR606001
LFR606003

CID
C
C
C
C
C
C

—
—
—
—
—
—
—

—
—
—
—
—
—
—

TORQUE

TERMINAL

AMP
RATING

POLES

Ordering Information (Class R 600 V)

2.8 N-m (25 in-lbs)

C
P
S

WIRE
RANGE

WIRE TYPE

BASE
SNAP
TEMP
TO
RATING RELEASE
130˚C

•

• LFH60030FBC

2.8 N-m (25 in-lbs)
13.6 N-m (120 in-lbs)
4.5 N-m (40 in-lbs)
4.0 N-m (35 in-lbs)

6-14 AWG
10-14 AWG CU Only
10-22 AWG
2-4 AWG
CU-AL
6-14 AWG
2/0-6 AWG
Solid/
8 AWG
CU-AL
Stranded
10-14 AWG

130˚C

•

• LFH60060FBC

130˚C

—

• LFH60100FBC

31.1 N-m (275 in-lbs)

250 kcmil-6

CU-AL

130˚C

—

—

—

31.1 N-m (275 in-lbs)

(2) 350 kcmil-1/0

CU-AL

130˚C

—

—

—

42.4 N-m (375 in-lbs)

(2) 500 kcmil-4

CU-AL

130˚C

—

—

—

5.6 N-m (50 in-lbs)

Note: Reinforcing springs standard on all Class R fuse blocks.
*Covers sold individually. One cover needed for each pole.

© 2014 Littelfuse POWR-GARD® Products Catalog

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6
Fuse Blocks and Holders

100

BOX
LUG
C
C
C
CID
CID
CID
CID

SUFFIX
PRES­SURE
SCREW
PLATE
P
S
P
S
P
S
—
—
—
—
—
—
—
—

INDICATION

60

1
2
3
1
2
3
1

BASE
ORDERING
NUMBER
LFR250301
LFR250302
LFR250303
LFR250601
LFR250602
LFR250603
LFR251001

TERMINAL

30

POLES

ORDERING NUMBER
AMP
RATING

Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS
Dimensions mm (inches)
28.6 [1.13]

250 V 30 A
15.6 [.61]
13.0 [.51]
4.8 [.19]

76.5
[3.01]

74.7 [2.94]

48.5 [1.91]
32.2 [1.27]

23.8 [.94]
16.3 [.64]
6.8 [.27]

42.9 [1.69]
31.8 [1.25]

40.1 [1.58]

15.9 [.63]

8.4
[.33]

5.6 [.22]

31.9
38.2 [1.26]
[1.51]

44.6
[1.76]

R2.8 [.11]
TYP

R2.8 [.11]
TYP
.2 THRU

3.6 [.14]

250 V 60 A
37.3 [1.47]

22.4 [.88]
14.8 [.58]
9.7 [.38]

57.4 [2.26]

104.1 [4.10]

70.7 [2.78]

24.9 [.98]

89.2 [3.51]

55.8 [2.20]

76.5 [3.01]

43.1 [1.70]

43.9 [1.73]

Fuse Blocks and Holders

6

75.7 [2.98]
119.7 [4.71]
R2.8 [.11]
TYP

5.5 [.21]

126.3 [4.97]

250 V 100 A

100.6 [3.96]

46.0 [1.81]

91.6 [3.61]

34.7 [1.37]
20.3 [.80]
11.3 [.45]

53.6 [2.11]
72.6 [2.86]

60.5 [2.38]
51.5 [2.03]

66.0 [2.60]
22.9 [.90]

R3.4 [.13]
TYP

133.0 [5.23]

177.8 [7.00]

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Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS
Dimensions mm (inches)
250 V 200 A
63.5 [2.50]
12.7 [.50]

76.2 [3.00]

228.6 [9.00]
215.9 [8.50]
184.2 [7.25]
165.1 [6.50]

63.5 [2.50]
19.1 [.75]
12.7 [.50]

52.6
[2.07]

72.4 [2.85]
15.9 [.63]

R4.3 [.17]
TYP.

128.5
[5.06]
181.1
[7.13]

Ø.3 THRU
Ø.3 THRU
Ø.8 .4

250 V 400 A

66.7 [2.63]
22.2 [.88]
15.9 [.63]

88.9 [3.50]

84.4 [3.32]

250.8 [9.88]

15.9 [.63]

15.9 [.63]

95.3
[3.75]
108.0
[4.25]

266.7 [10.50]

95.3 [3.75]
Ø.3 THRU
Ø.8 .4

Ø.3 THRU
Ø.8 .4

6

196.9 [7.75]

184.2
[7.25]

317.5 [12.5]

114.3 [4.5]
79.4 [3.1]
34.9 [1.4]
19.1 [.8]

250 V 600 A

19.1 [.8]

114.3
[4.5]
139.7
[5.5]

Fuse Blocks and Holders

292.1
[11.50]

110.6 [4.4]

298.5 [11.8]

15.9 [.6]

114.3 [4.5]
Ø.3 THRU
Ø.6 .4

Ø.3 THRU
Ø.6 .4
Ø.3 THRU
Ø.8 .4

241.3 [9.5]

215.9
[8.5]

355.6
[14.0]

© 2014 Littelfuse POWR-GARD® Products Catalog

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Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS
Dimensions mm (inches)
38.4 [1.51]

21.5 [.85]
19.2 [.76]
16.8 [.66]
6.4 [.25]

600 V 30 A

73.1 [2.88]

52.5 [2.07]

107.9 [4.25]
86.4 [3.40]
75.9 [2.99]

51.6 [2.03]
41.1 [1.62]

20.7 [.82]

47.6
[1.87]
R3.4 [.13]
TYP
R2.6 [.10]
TYP

56.0
[2.20]
118.6
[4.67]
127.1
[5.00]
166.7
[6.56]

600 V 60 A

43.8 [1.73]

83.6 [3.29]

32.4 [1.28]
29.8 [1.17]
19.9 [.78]
11.4 [.45]

6

69.5 [2.74]

123.2 [4.85]
109.3 [4.30]

59.6 [2.35]

59.7 [2.35]

99.4 [3.91]

22.9 [.90]

55.2

74.2 [2.18]
[2.92]

R3.4 [.13]
TYP
.2 THRU
.5 .5

Fuse Blocks and Holders

134.6
[5.30]
184.2
[7.25]

600 V 100 A

33.8 [1.33]
19.6 [.77]
15.0 [.59]

145.3 [5.72]
125.7 [4.95]
107.0 [4.21]
79.8 [3.14]
61.0 [2.40]

53.4 [2.10]

66.0 [2.60]
22.9 [.90]

64.6 [2.54]
R3.4 [.13]
TYP

172.8 [6.80]

228.6 [9.00]

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Blocks and Holders

LF SERIES CLASS R & H/K5 FUSE BLOCKS
Dimensions mm (inches)
600 V 200 A

63.5 [2.50]
44.5 [1.75]
31.8 [1.25]
12.7 [.50]

76.2 [3.00]
63.5 [2.50]
12.7 [.50]
52.3
[2.06]
84.2
[3.32]

Ø.3 THRU
Ø.7 .4
Ø.3 THRU
Ø.8 .4

160.1
[6.31]

228.6 [9.00]
196.9 [7.75]
165.1 [6.50]

72.4
[2.85]
15.9
[.63]

52.3
[2.06]
76.7
[3.02]
84.1
[3.31]

Ø.3 THRU
Ø.3 THRU
Ø.8 .4

160.3
[6.31]

192.0
[7.56]
244.3
[9.62]

R4.3 [.17]
TYP.

88.9 [3.50]
73.0 [2.88]
66.7 [2.63]
22.2 [.88]
15.9 [.63]

600 V 400 A

95.3
[3.75]
146.1
[5.75]

266.7 [10.50]
15.9 [.63]

250.8 [9.88]

84.4 [3.32]
15.9 [.63]

Ø.3 THRU
Ø.8 .4

6

222.3
[8.75]

Fuse Blocks and Holders

273.1
[10.75]
368.3
[14.50]

114.3 [4.50]
95.3 [3.75]
79.4 [3.13]
34.9 [1.38]
19.1 [.75]

600 V 600 A

114.3
[4.50]
177.8
[7.00]
254.0
[10.00]

19.1 [.75]

317.5 [12.50]
298.5 [11.75]

110.6 [4.36]
15.9 [.63]

Ø.3 THRU
Ø.6 .4
Ø.3 THRU
Ø.8 .4

431.8
[17.00]

© 2014 Littelfuse POWR-GARD® Products Catalog

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Blocks and Holders

LF SERIES CLASS T FUSE BLOCKS
300 V • 600 V

Specifications
Voltage Ratings	
Ampere Ratings	
Leakage Current	
Withstand Rating	
Flammability Rating	
Approvals	
	
Environmental	

Description
The Littelfuse Class T fuse blocks offer many advantages
such as space saving design, universal mounting holes,
snap-to-release DIN rail mounts and available covers.

Recommended Fuses
300 V JLLN......................................................................... 24
600 V JLLS.......................................................................... 24

Features/Benefits
•	
•	
•	
•	
•	

Web Resources

Space-saving design
Universal mounting holes for easy replacement
One hand release from DIN rail for 30–60 A fuses
Reinforced fuse clips are standard
Covers available for most amperages to enhance safety

Download CAD drawings, fuse block cover datasheet and
other technical information: littelfuse.com/lft

WIRE
RANGE

1

2

3

30

LFT30030

1

2

3

C

—

—

5.6 N-m (50 in-lbs)
2.8 N-m (25 in-lbs)
5.6 N-m (50 in-lbs)
2.8 N-m (25 in-lbs)
13.6 N-m (120 in-lbs)
4.5 N-m (40 in-lbs)
4.0 N-m (35 in-lbs)
31.1 N-m (275 in-lbs)
(2) 31.1 N-m (275 in-lbs)
(2) 42.4 N-m (375 in-lbs)

2-4 AWG
6-14 AWG
2-4 AWG
6-14 AWG
2/0-6 AWG
8 AWG
10-14 AWG
250 kcmil-6
250 kcmil-6
500 kcmil-6

60

LFT30060

1

2

3

C

—

—

100

LFT30100

1

—

3

CS

—

—

200
400
600

LFT30200
LFT30400
LFT30600

1
1
1

—
—
—

3
3
3

CS
CS
CS

—
—
—

—
—
—

WIRE
TYPE

DIN RAIL
MOUNT

TORQUE

TERMINAL SUFFIX
BOX PRES­SURE
LUG
PLATE SCREW

Solid / Stranded

POLES

BASE
ORDERING
NUMBER

BASE TEMP
RATING

ORDERING NUMBER

CU-AL

AMP
RATING

Ordering Information (Class T 300 V)
COVER
ORDERING
NUMBER*

125˚C

•

LFT30030FBC

125˚C

•

LFT30060FBC

130˚C

—

LFT30100FBC

130˚C
130˚C
130˚C

—
—
—

—
—
—

3

30

LFT60030

1

2

3

C

P

S

60

LFT60060

1

2

3

C

—

—

100

LFT60100

1

—

3

CS

—

—

200
400
600

LFT60200
LFT60400
LFT60600

1
1
1

—
—
—

3
3
3

CS
CS
CS

—
—
—

—
—
—

2.5 N-m (25 in-lbs)
5.6 N-m (50 in-lbs)
P
2.8 N-m (25 in-lbs)
S
2.8 N-m (25 in-lbs)
5.6 N-m (50 in-lbs)
2.8 N-m (25 in-lbs)
13.6 N-m (120 in-lbs)
4.5 N-m (40 in-lbs)
4.0 N-m (35 in-lbs)
31.1 N-m (275 in-lbs)
(2) 31.1 N-m (275 in-lbs)
(2) 42.4 N-m (375 in-lbs)

C

WIRE
TYPE

6-14 AWG CU-AL
2-4 AWG
10-14 AWG CU Only
10-22 AWG CU Only
2-4 AWG
6-14 AWG
2/0-6 AWG
8 AWG
10-14 AWG
250 kcmil-6
250 kcmil-6
500 kcmil-6

DIN RAIL
MOUNT

2

WIRE
RANGE

BASE TEMP
RATING

1

TORQUE

Solid / Stranded

TERMINAL SUFFIX
BOX PRES­SURE SCREW
PLATE
LUG

BASE
ORDERING
NUMBER

CU-AL

ORDERING NUMBER
POLES

TERMINAL

Ordering Information (Class T 600 V)
AMP
RATING

Fuse Blocks and Holders

6

300 Vac/600 Vac
0 – 600 A
<0.6 mA at 600 V
200 kA RMS SYM
UL94 V-0
UL Listed (File: E14721)
CSA Certified (File: LR7316)
RoHS Compliant, Lead (Pb) Free

COVER
ORDERING
NUMBER*

125˚C

•

LFT60030FBC

125˚C

•

LFT60060FBC

130˚C

—

LT60100FBC

130˚C
130˚C
130˚C

—
—
—

LT60200FBC
LT60400FBC
LT60600FBC

* Covers sold individually. One cover needed for each pole.

littelfuse.com

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© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LF SERIES CLASS T FUSE BLOCKS
Dimensions mm (inches)
300 V 30 A
21.8 [.86]

15.0 [.59]

59.9 [2.36]

40.9 [1.61]

6.9 [.27]

35.6 [1.40]

44.9 [1.77]

25.9 [1.02]

35.6
[1.40]
Ø4.5 [.18]
TYP.

71.1
[2.80]

3.7 [.15]

300 V 60 A
46.9 [1.85]

24.6 [.97]
16.4 [.65]

30.5 [1.20]

8.2 [.32]

41.9 [1.65]

69.1 [2.72]
52.7 [2.07]

36.8
[1.45]

6

Ø4.5 [.18]
TYP.

Fuse Blocks and Holders

73.7
[2.90]

4.5 [.18]

300 V 100 A
34.8 [1.37]

104.6 [4.12]

26.9 [1.06]

17.4 [.69]

26.0 [1.03]
17.4 [.69]
7.9 [.31]

7.9 [.31]

9.5 [.38]

66.7
[2.63]
133.4
[5.25]

© 2014 Littelfuse POWR-GARD® Products Catalog

42.8 [1.69]

47.6 [1.88]
Ø.2 THRU
Ø.4 .5

15.9 [.63]

Ø.2 THRU
Ø.4 .5
Ø.2 THRU
Ø.5 .4

R3.2 [.13]
TYP.

95

littelfuse.com

Blocks and Holders

LF SERIES CLASS T FUSE BLOCKS
Dimensions mm (inches)
38.1 [1.50]
19.1 [.75]

300 V 200 A

Ø.3 THRU
Ø.5 .5

9.5 [.38]

114.3 [4.50]
92.1 [3.63]

22.2 [.88]
9.5 [.38]

57.2 [2.25]
15.9 [.63]

88.9
[3.50]
R3.6 [.14]
TYP.

168.3
[6.63]
177.8
[7.00]

28.6 [1.13]
12.7 [.50]

300 V 400 A

9.5 [.38]

103.1
[4.06]

60.6 [2.38]

85.7 [3.38]

Ø.3 THRU
Ø.5 .5

15.9 [.63]

Ø.3 THRU
Ø.6 .5

6
Fuse Blocks and Holders

171.5 [6.75]
127.0 [5.00]

57.2 [2.25]

206.2
[8.12]

300 V 600 A

209.6 [8.25]

9.5 [.38]
8.8 [.35]

79.4 [3.13]

69.9 [2.75]
60.3 [2.38]

74.4 [2.93]

60.3 [2.38]
Ø.3 THRU
Ø.5 .5

15.9 [.63]

54.0 [2.13]

111.1
[4.38]
Ø.3 THRU
Ø.8 .5

213.5
[8.41]
222.3
[8.75]

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Blocks and Holders

LF SERIES CLASS T FUSE BLOCKS
Dimensions mm (inches)
600 V 30 A

24.6 [.97]
17.0 [.67]

46.9 [1.85]

69.1 [2.72]

29.8 [1.17]

7.6 [.30]

41.9 [1.65]

52.0 [2.05]

44.8
[1.77]
R2.9 [.11]
TYP.

89.7
[3.53]

600 V 60 A

39.9 [1.57]
9.5 [.38]

54.0 [2.13]

112.3 [4.42]

76.1 [3.00]

81.9 [3.23]

45.7 [1.80]

6

36.2
[1.42]

Fuse Blocks and Holders

72.3
[2.85]

3.7 [.15]

600 V 100 A

34.8 [1.37]
17.5 [.69]
7.9 [.31]
9.5 [.38]

26.0 [1.03]
Ø.2 THRU 7.9 [.31]
Ø.4 .5

77.0 [3.03]

42.8 [1.69]

104.6 [4.12]

47.6 [1.88]
15.9 [.63]

77.0
[3.03]
Ø.3 THRU
Ø.5 .4

R3.2 [.13]
TYP.

153.9 [6.06]

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Blocks and Holders

LF SERIES CLASS T FUSE BLOCKS
Dimensions mm (inches)
38.1 [1.50]

600 V 200 A

114.3 [4.50]

19.1 [.75]

19.1 [.75]

57.2 [2.25]
15.9 [.63]

Ø.3 THRU 9.5 [.38]
Ø.5 .5

9.5 [.38]

98.4 [3.88]

Ø.3 THRU
Ø.6 .5

196.9 [7.75]

57.2 [2.25]

600 V 400 A

44.5 [1.75]

171.5 [6.75]

28.6 [1.13]

127.0 [5.00]

12.7 [.50]
Ø.3 THRU
Ø.5 .5

9.5 [.38]

60.3 [2.38]

85.7 [3.38]

15.9 [.63]

6
Fuse Blocks and Holders

114.3 [4.50]

Ø.3 THRU
Ø.6 .5

228.6 [9.00]

600 V 600 A

209.6 [8.25]
149.2 [5.88]

69.9 [2.75]

130.2 [5.13]

60.3 [2.38]
9.5 [.38]

9.5 [.38]
Ø.3 THRU
Ø.5 .5

79.4 [3.13]
60.3 [2.38]
54.0 [2.13]

74.4 [2.93]
15.9 [.63]

123.8 [4.88]
Ø.3 THRU
Ø.8 .5

247.7 [9.75]

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Blocks and Holders

LF SERIES CLASS G FUSE BLOCKS
480 V • 600 V

Specifications
Voltage Ratings	
	
Ampere Ratings	
Flammability Rating	
Approvals	
	

Description

600 Vac (0–20 A)
480 Vac (25–60 A)
0–60 A
UL94 V-0
UL Listed (File: E14721)
CSA Certified (File: LR7091)

All Littelfuse Class G fuse blocks offer snap-to-release
DIN rail mounting and universal mounting holes. Class
G fuse blocks are designed for use with time-delay
current limiting Class G fuses.

Recommended Fuses

Features/Benefits

Web Resources

•	 Universal mounting holes for easy replacement

Download CAD drawings and other technical information:
littelfuse.com/lfg

Time Delay
Series: SLC......................................................................... 26

•	 One hand release from DIN rail for most amperages
•	 Meet requirements for branch circuit protection

6

Ordering Information (Class G 600 V)

BOX
LUG

1 LFG600151 CDINR
15

20

SUFFIX
PRES­SURE
SCREW
PLATE
PQDINR

SQDINR

2 LFG600152 CDINR

PQDINR

SQDINR

3 LFG600153 CDINR

PQDINR

SQDINR

1 LFG600201 CDINR

PQDINR

SQDINR

2 LFG600202 CDINR

PQDINR

SQDINR

3 LFG600203 CDINR

PQDINR

SQDINR

CU Only

Solid / Stranded

POLES

BASE
PART
NUMBER

BASE
DIN RAIL
TEMP
MOUNT
RATING

WIRE
TYPE

150˚ C

•

150˚ C

•

TERMINAL INFORMATION
TERMINAL

WIRE RANGE

TORQUE

Box Lug

6-14 AWG

4.0 N-m (35 in-lbs)

Pressure Plate

10-14 AWG

2.3 N-m (20 in-lbs)

Screw

10-14 AWG

2.3 N-m (20 in-lbs)

Box Lug

6-14 AWG

4.0 N-m (35 in-lbs)

Pressure Plate

10-14 AWG

2.3 N-m (20 in-lbs)

Screw

10-14 AWG

2.3 N-m (20 in-lbs)

Ordering Information (Class G 480 V)

60

BASE
PART
NUMBER

BOX
LUG

SUFFIX
PRES­SURE
SCREW
PLATE

1 LFG480301

CDINR

PQDINR

SQDINR

2 LFG480302

CDINR

PQDINR

SQDINR CU Only

3 LFG480303

CDINR

PQDINR

SQDINR

1 LFG480601

CDINR

—

—

2 LFG480602

CDINR

—

—

3 LFG480603

CDINR

—

—

© 2014 Littelfuse POWR-GARD® Products Catalog

BASE
DIN RAIL
TEMP
MOUNT
RATING

WIRE
TYPE

CU/Al

Solid / Stranded

30

POLES

ORDERING NUMBER
AMP
RATING

150˚ C

•

125˚ C

•

99

TERMINAL INFORMATION
TERMINAL

WIRE RANGE

TORQUE

Box Lug

6-14 AWG

4.0 N-m (35 in-lbs)

Pressure Plate

10-14 AWG

2.3 N-m (20 in-lbs)

Screw

10-14 AWG

2.3 N-m (20 in-lbs)

2-4 AWG

5.6 N-m (50 in-lbs)

Box Lug

6-14 AWG

2.8 N-m (25 in-lbs)

6-14 AWG

2.8 N-m (25 in-lbs)

littelfuse.com

Fuse Blocks and Holders

ORDERING NUMBER
AMP
RATING

Blocks and Holders

LF SERIES CLASS G FUSE BLOCKS
Dimensions mm (inches)
600 V 15 & 20 A
480 V 30 A

59.9 (2.36)
38.1 (1.50)

19.1 (0.75)

8.5 (0.34)

5.3 (0.21)

34.4 (1.36)
25.5 (1.01)

21.7 (0.85)
16.4 (0.65)
9.3 (0.37)

35.6 (1.40)

15.4 (0.61)
6.5 (0.26)

38.1 (1.50)
R2.2 (0.09)
TYP.

76.2 (3.00)

R2.6 (0.10)
TYP.

R2.7 (0.11)
TYP.

R2.3 (0.09)
TYP.

4.1 (0.16)

Fuse Blocks and Holders

6
480 V 60 A

59.9 (2.36)
44.9 (1.77)

40.9 (1.61)

8.3 (0.33)

25.8 (1.02)

25.8 (1.02)

21.8 (0.86)
6.8 (0.27)

15.1 (0.59)

15.1 (0.59)

35.6 (1.40)

6.8 (0.27)

6.8 (0.27)

55.1 (2.17)

95.3 (3.75)

R2.3 (0.09)
TYP.

3.7 (0.15)

littelfuse.com

100

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LF SERIES CLASS CC/CD AND MIDGET (10X38 mm) FUSE BLOCKS
600 V
Specifications

The Littelfuse Class CC, CD and midget blocks offer
generous space savings and enhanced value. DIN rail
mounting and universal mounting holes are available as
well as an indication feature on all Class CD fuse blocks.

Voltage Rating	
600 Vac/dc
Ampere Ratings	
L600M Midget (10x38): 30 A
	
L600C Class CC: 30 A
	
LFC Class CD: 60 A
Dielectric strength	
1200 V minimum
Material	
Base: Thermoplastic
	
Clip/Terminals: Copper alloy (tin plated)
	
Box Lug: Copper
	
Screw & Pressure Plate: Steel (zinc plated)
Flammability Rating	
UL94 V-0
Approvals	
L600M:	 UL Recognized (File: E14721)
		
CSA Certified (File: LR7316)
	
L600C: 	 UL Listed (File: E14721)
		
CSA Certified (File: LR7316)
	
LFC: 	
UL Listed (File: E14721)
		
CSA Certified (File: LR7316)
Environmental	
RoHS Compliant, Lead (Pb) Free

Features/Benefits

Recommended Fuses

Description

Class CC & CD
CCMR................................................................................. 27
KLDR, KLKR........................................................................ 28
Midget Series.................................................................... 30

•	
•	
•	
•	
•	

Web Resources
Download CAD drawings, fuse block cover datasheet and
other technical information: littelfuse.com/fuseblocks

30

30

1
2
3
1
2
3
1
2
3

MIDGET ORDERING NUMBER

NON-DIN*

DIN-RAIL

NON-DIN*

DIN-RAIL

L60030C1C
L60030C2C
L60030C3C
L60030C1PQ
L60030C2PQ
L60030C3PQ
L60030C1SQ
L60030C2SQ
L60030C3SQ

L60030C1CDINR
L60030C2CDINR
L60030C3CDINR
L60030C1PQDINR
L60030C2PQDINR
L60030C3PQDINR
L60030C1SQDINR
L60030C2SQDINR
L60030C3SQDINR

L60030M1C
L60030M2C
L60030M3C
L60030M1PQ
L60030M2PQ
L60030M3PQ
L60030M1SQ
L60030M2SQ
L60030M3SQ

L60030M1CDINR
L60030M2CDINR
L60030M3CDINR
L60030M1PQDINR
L60030M2PQDINR
L60030M3PQDINR
L60030M1SQDINR
L60030M2SQDINR
L60030M3SQDINR

CONNECTOR
TYPE

TORQUE

WIRE
RANGE

Box Lug

4.0 N-m
(35 in-lbs)

6-14 AWG

Pres­sure Plate
w/Q.C. Terminal

2.3 N-m
(20 in-lbs)

10-14 AWG

Screw
w/Q.C. Terminal

2.3 N-m
(20 in-lbs)

10-14 AWG

WIRE TYPE

Solid / Stranded

30

CLASS CC ORDERING NUMBER

CU Only

AMP
RATING
POLES

Ordering Information (L600C Class CC and L600M Midget 30 A)
COVER
BASE
ORDERING
TEMP
NUMBER †
125˚C

SPL001

125˚C

SPL001

125˚C

SPL001

Ordering Information (LFC Class CD 60 A)
AMP
POLES
RATING
60

1
2
3

ORDERING
NUMBER

CONNECTOR
TYPE

TORQUE

WIRE
RANGE

LFC600601CID
LFC600602CID
LFC600603CID

Box Lug

5.6 N-m (50 in-lbs)
2.8 N-m (25 in-lbs)

2-4 AWG
6-14 AWG

WIRE TYPE

CU-AL

Solid /
Stranded

BASE TEMP DIN RAIL
INDICATION
RATING
MOUNT
125˚C

•

•

COVER
ORDERING
NUMBER †

LFC60060FBC

* Gangable
†
Covers sold individually. One cover needed for each pole.

© 2014 Littelfuse POWR-GARD® Products Catalog

101

littelfuse.com

6
Fuse Blocks and Holders

Space-saving design
Universal mounting holes for easy replacement
Indication offered on CD blocks
One hand release from DIN rail optional
Rejection feature that prevents the insertion of fuses
with lower interrupting rating or voltage ratings
•	 Clip design reduces resistance and heat
•	 Non DIN Rail fuse blocks have interlocking feature
allowing ganging for any number of poles
•	 Covers available for all amperages to enhance safety

Blocks and Holders

LF SERIES CLASS CC/CD AND MIDGET (10X38 mm) FUSE BLOCKS
Dimensions mm (inches)
CLASS CC / MIDGET DIN RAIL 600 V 30 A
35.56
[1.400]

19.05
35.56
[0.750]
[1.400]

38.10
[1.500]

35.56 [1.400]

59.94 [2.360]

76.20 [3.000]

76.20
[3.000]

84.56 [3.329]
(2) PLACES

84.97
[3.345]

84.97
[3.345]

76.20
[3.000]

UNLATCHED

CLASS CC / MIDGET NON-DIN RAIL 600 V 30 A

0.783"
[19.89]

1.533"

2.283"

[38.15]

[57.15]

1.25"

[31.75]

6
3.0"

Fuse Blocks and Holders

3.0"

3.0"

[76.2]

[76.2]

1 POLE

[76.2]

2 POLE

3 POLE

CLASS CD DIN RAIL 600 V 60 A

1.01"

29.2 [1.15]

[25.65]

2.12"
[53.85]

55.9 [2.20]

3.12"

49.5 [1.95]1.01"
[25.65]

82.6 [3.25]

[79.25]

3.35"

3.35"

3.35"

3.35"

[85.09]

[85.09]

[85.09]

[85.09]

94.1 [3.70]

1.01"

1.89"

[25.65]

1 POLE

littelfuse.com

2 POLE

3 POLE

102

[48.0]

ADDER

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

BOARD MOUNT MIDGET (10X38 mm) FUSE HOLDER
600 V
Specifications
Voltage Rating 	
Amperage Rating	
Approval	
Mounting Method	

600 Vac/dc
30 A
UL Recognized (File: E14721)
Through hole solder/PCB

Ordering Information
CATALOG NUMBER

ORDERING NUMBER

Block

L60030M3PCB

L60030M3PCB

Cover*

SPL001PCB

SPL0001PCBT

*C overs are single pole—need to order a quantity of 3 for each block.

Recommended Fuses
Midget (10 x 38 mm) series ............................................... 30

Description

Web Resources

The PC board-mounted midget fuse holder is a one-piece
holder designed to provide a more robust and secure
solution. It offers a smaller footprint and flexible
mounting options.

Dimensions mm (inches)

Download CAD drawings and other technical information:
littelfuse.com/fuseblocks

1 .4 7 [ .0 5 8 ]
( 1 8 PLACES)

2 .5 4 [ .1 0 0 ]
For use with Midget-style
fuses
and fuse covers, it is
2 .5 4 [ .1 0 0 ]
UL Recognized and can be covered for additional protection.

6

•	 Through hole PCB mounting
•	 Robust and secure block design
•	 All-in-one package offers easy installation

33.15 (1.305)
4 1 .6 1 [ 1 .6 3 8 ]

600 V 30 A
100,000 A RMS SYM.

L60030M3PCB

2 9 .5 7 [ 1 .1 6 4 ]

36.97
(1.455)

•	 Space saving footprint
•	 Touch Safe cover/puller available
•	 3-pole configurations

46.99 (1.850)

6 .0 2 [ .2 3 7 ]

Applications
•	 HVAC market

1.47 (.058)
(18 PLACES)

2 2 .8 6 [ .9 0 0 ]

•	 Industrial manufacturing

2.54 (.100)

2.54 (.100)

•	 Mass production facilities

SPL001PCB Cover

41.61
(1.638)
29.57
(1.164)

6.02 (.237)
22.86 (.900)

Dimensions mm (inches)
© 2014 Littelfuse POWR-GARD® Products Catalog

103

littelfuse.com

Fuse Blocks and Holders

Features/Benefits

Blocks and Holders

CLASS CC AND MIDGET FUSE BLOCK ACCESSORIES
FBDIN1 Rail Adapter
Dimensions Inches

Features/Benefits
•	 DIN Rail adaptor for 30 A Midget, Class CC and
Class G fuse blocks
•	 Patented design with no tools necessary for installation
•	 Permits snap-mounting of 30 A Midget, Class CC and
Class G fuse blocks to standard and low profile 35 mm
symmetrical DIN rails and 32 mm asymmetrical DIN rails
•	 Easy removal via disconnect tab

Web Resources

Fuse Blocks and Holders

6

For additional technical information visit:
littelfuse.com/fbdin1

Recommended Fuse Blocks
Midget-Style and Class CC ............................................... 101
Class G .............................................................................. 99
New DIN rail mountable fuse holders available on page 101

Dimensions Inches

SPL001 Cover Puller

1.22"

0.665"

3.0"

Features/Benefits
Recommended Fuse Blocks

•	 600 V 1⁄10-30 A Class CC and Midget fuse cover puller
that offers increased protection when removing fuses

L60030C ........................................................................... 101
L60030M .......................................................................... 101

•	 Simple removal without the need for a separate puller
•	 Meets Dead Front requirements

Web Resources

•	 Easily gangable with 1⁄8" diameter wire

For additional technical information visit:
littelfuse.com/spl001

•	 For use with all 600 V Class CC and Midget 1⁄10-30 A fuses
•	 Label provided for easy fuse identification

littelfuse.com

104

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LF SERIES FUSE BLOCK COVERS

Specifications
Connection	
Material	
Flammability Rating	
Approvals	
	
	

Snap to fuse body
Black thermoplastic
UL94 V-0
UL Listed (File: E184929)
CSA Certified
(File: 007316_0_000 Class 6225-01)

Features/Benefits
•	
•	
•	
•	
•	
•	

Description
Littelfuse fuse block covers protect personnel from
accidentally coming into contact with energized
parts. Covers are for use with Littelfuse LF Series UL
class fuse blocks.

Added safety to personnel
Ventilation helps avoid fuse derating
Reusable and convenient snap-on design
UL listed and CSA certified
Available for Class H/R, Class J, Class T and Class CD
Allows visibility of LF series fuse block indicator

Web Resources
For dimensions, cad drawings and additional technical
information visit: littelfuse.com/fuseblocks

Contact the Littelfuse Tech-Line (800-TEC-FUSE) for block
and cover compatibility questions.

6

Ordering Information
AMPERAGE

COVER ORDERING NUMBER

250

30

LFH25030FBC

Class H/R

LFH25060 / LFR25030

250

60

LFH25060FBC

Class H/R

LFH25100 / LFR25100

250

100

LFH25100FBC

Class H/R

LFH60030 / LFR60030

600

30

LFH60030FBC

Class H/R

LFH60060 / LFR60060

600

60

LFH60060FBC

Class H/R

LFH60100 / LFR60100

600

100

LFH60100FBC

Class J

LFJ60030

600

30

LFJ60030FBC

Class J

LFJ60060

600

60

LFJ60060FBC

Class J

LFJ60100

600

100

LFJ60100FBC†

Class T

LFT30030

300

30

LFT30030FBC

Class T

LFT30060

300

60

LFT30060FBC

Class T

LFT30100

300

100

LFT30100FBC

Class T

LFT60030

600

30

LFT60030FBC

Class T

LFT60060

600

60

LFT60060FBC

Class T

LFT60100

600

100

LT60100FBC

Class T

LFT60200

600

200

LT60200FBC

Class T

LFT60400

600

400

LT60400FBC

Class T

LFT60600

600

600

LT60600FBC

Class CD

LFC60060

600

60

LFC60060FBC

Class CC

L60030C

600

30

SPL001

* Part number shown excludes reference to number of poles and terminal type
† Cover is not compatible with 70-100 A JLS series fuses

© 2014 Littelfuse POWR-GARD® Products Catalog

105

littelfuse.com

Fuse Blocks and Holders

VOLTAGE

Class H/R

FUSE BLOCK BASE
PART NUMBER*
LFH25030 / LFR25030

UL CLASS

Blocks and Holders

LPXV TOUCH-SAFE FUSE HOLDERS
1500 Vdc • 30 A

Specifications

Description

Voltage Ratings 	
1500 Vdc
Amperage Rating	
30 A
SCCR Rating	
15 kA
Fuse Type	10x85mm
Material	Thermoplastic
Flammability Rating	
UL94 V-0
Temperature Stability	
Body: 125˚ C
	
Carrier: 140˚ C
Approvals	
UL 4248-18 Listed (File: E345481)
	
IEC 60269-1 & IEC 60269-2
Environmental	
RoHS compliant, Lead (Pb) free

The Littelfuse LPXV fuse holder is designed to hold
1500 Vdc 10x85mm fuses.

Dimensions Inches (mm)

Features/Benefits

Fuse Blocks and Holders

6

•	
•	
•	
•	

Finger-Safe design offers personnel protection
No fuse pullers or tools required for fuse removal
35 mm DIN Rail Mountable
Compact design

Recommended Fuses

5.1
(130.0)

4.11
(104.5)

Littelfuse SPXV 1500 Vdc Fuses........................................ 57

Web Resources
For additional technical informations, visit:
littelfuse.com/lpxv

1.57
(40.0)
1.89
(48.0)
2.28
(58.0)
2.54
(64.5)

Ordering Information
SERIES

VOLTAGE
(Vdc)

POLES

CATALOG
NUMBER

ORDERING
NUMBER

PACK
QTY

TERMINAL INFORMATION
TERMINAL
TYPE

WIRE TYPE

Box Lug

90˚ Max
CU Only
Stranded

NUMBER
OF WIRES
1

LPXV

1500

1

LPXV001

.88
(22.3)

LPXV0001Z

5

1
2*

WIRE SIZE

TORQUE

6-4 AWG
(16-25 mm2)
18-8 AWG
(.75-10 mm2)
18-6 AWG
(.75-16 mm2)

22-26 lb-in
(2.5-3 N-m)
18-22 lb-in
(2-2.5 N-m)
18-22 lb-in
(2-2.5 N-m)

*Must be the same cross-sectioned size

Look for this logo to indicate products that are used in solar applications. Visit our website
littelfuse.com/solar for the latest updates on approvals, certifications, and new products.
littelfuse.com

106

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LFJ1000 SERIES SOLAR FUSE BLOCKS
1000 Vdc • Clip-to-Box • Stud-to-Stud • Clip-to-Stud

Specifications

Clip-to-Box

Stud-to-Stud

Voltage Ratings		
Ampere Ratings		
Flammability Rating		
Termination Type		
Base Temp Rating		
Approvals		
		
Environmental		

Clip-to-Stud

Description
The LFJ1000 series fuse block is specifically designed
for the Littelfuse SPFJ 1000 V Solar Fuse. It meets UL
electrical requirements, is available in multiple amperages,
and comes in a variety of fuse mounting and termination
configurations; fuse clip to box lug, fuse stud to wire stud
and fuse clip to wire stud.

1000 Vdc
200, 400, 450 A
UL94 V-0
Box Lug or Stud Mount
130˚ C
UL 4248-18 Listed
File: E345481 Vol. 1
RoHS Compliant

Recommended Fuses
SPFJ Solar Series............................................................... 61

Web Resources
Download CAD drawings, dimensions and other technical
information: littelfuse.com/LFJ1000

Features/Benefits

6

Ordering Information
(Clip-to-Box Lug 1000 V)
AMPERAGE

ORDERING
NUMBER

INTERRUPT
RATING

WIRE RANGE
STANDARD (METRIC)

200

LFJ102001C

20 kA

250 kcmil - #6 (127mm2 - 16mm2)

400

LFJ104001C

10 kA

350 kcmil - 1/0 (177mm - 55mm )

450

LFJ104501C

20 kA

500 kcmil - #4 (253mm2 - 25mm2)

2

WIRE TYPE
2

Cu/Al

Solid/
Stranded

RECOMMENDED
TORQUE
275 in-lb (31.1 N-m)
275 in-lb (31.1 N-m)
375 in-lb (42.4 N-m)

(Stud-to-Stud 1000 V)
RECOMMENDED TORQUE
FUSE
TERMINAL

AMPERAGE

ORDERING
NUMBER

INTERRUPT
RATING

MAX. BUSBAR
THICKNESS

200

LFJ102001STST

20 kA

65 in-lb (7.3 N-m)

200 in-lb (22.6 N-m)

.774” (19.66 mm)

400

LFJ104001STST

10 kA

170 in-lb (19.2 N-m)

200 in-lb (22.6 N-m)

.555” (14.10 mm)

450

LFJ104501STST

20 kA

300 in-lb (33.9 N-m)

300 in-lb (33.9 N-m)

.570” (14.18 mm)

RECOMMENDED BASE TORQUE
BOLT SIZE
TORQUE
1/4”
5/16”

30-40 in-lb
40-50 in-lb

(Clip-to-Stud 1000 V)
AMPERAGE

ORDERING
NUMBER

INTERRUPT
RATING

RECOMMENDED TORQUE
TERMINAL

MAX. BUSBAR
THICKNESS

200

LFJ102001CST

20 kA

200 in-lb (22.6 N-m)

.774” (19.66 mm)

400

LFJ104001CST

10 kA

200 in-lb (22.6 N-m)

.555” (14.10 mm)

450

LFJ104501CST

20 kA

300 in-lb (33.9 N-m)

.570” (14.18 mm)

© 2014 Littelfuse POWR-GARD® Products Catalog

107

RECOMMENDED BASE TORQUE
BOLT SIZE
TORQUE
1/4”
5/16”

30-40 in-lb
40-50 in-lb

littelfuse.com

Fuse Blocks and Holders

•	 Narrow width increases space savings
•	 Range of amperages to match all SPFJ fuse options
•	 Box Lug termination style accommodates a wide
range of cable sizes
•	 Stud-mounted option increases convenience
•	 Approval for use with copper or aluminum lugs
allowing for design flexibility

Blocks and Holders

LF SERIES SOLAR FUSE BLOCKS
1000 Vdc
Dimensions mm (inches)
Clip-to-Box
298.45
(11.75)

155.7
(6.13)

254.0
(10.0)

77.9
(3.07)

146.1
(5.75)

19.1
(0.75)

174.63
(6.88)

25.40
(1.00)

123.83
(4.88)

108.0
(4.25)
19.1
(0.75)

50.8
(2.00)

76.20
(3.00)
101.60
(4.00)

57.2
(2.25)

69.9
(2.75)

76.2
(3.00)

ø8.64 THRU

ø7.1 THRU

ø8.6 THRU

⊔ø19.1 10.2
ø0.34 THRU
[⊔
ø0.75 0.40 ]

⊔ø14.2 x 11.2
ø0.28 THRU
[⊔
ø0.56 x 0.44]

⊔ø19.1 11.2
ø0.34 THRU
[⊔
ø0.75 0.44 ]
72.4
(2.85)

84.4
(3.32)

15.9
(0.63)

110.58
(4.35)

15.9
(0.63)
15.88
(0.63)

450 A

400 A

200 A

Stud-to-Stud
135.80
(5.347)
120.17
(4.731)
105.41
(4.150)

20.88
(.822)

87.33
(3.438)

6

∅ 8.64 THRU
⊔∅19.05 10.16
∅ 0.34 THRU
⊔∅ 0.75 0.40

[

]

22.10
(.870)

87.33
(3.438)

111.13
(4.375)

7/16-14 UNC-2A

8.61
(.339)

33.02
(1.30)
8.61
(.339)

29.49
(1.161)
TYP

108.41
(4.268)

8.61
(.339)

29.49
(1.161)
8.61
(.339)

33.02
(1.300)

∅ 8.64 THRU

⊔∅19.05 10.16
195.53
(7.698)
7/16-14 UNC-2A

34.14
(1.344)

∅ 8.64 THRU

∅ 0.34 THRU
[⊔
∅ 0.75 0.40 ]

133.35
(5.250)

1/4-20 UNC-2A

Fuse Blocks and Holders

96.42
(3.796)

⊔∅19.05 10.16

40.79
(1.606)

231.70
(9.122)

254.91
(10.036)

1/2-13 UNC-2A

28.57
(1.125)

74.93
(2.950)

79.76
(3.140)

∅ 0.34 THRU
[⊔
∅ 0.75 0.40 ]

152.40
(6.000)

230.94
(9.092)

3/8-16 UNC-2A

16.13
(.635)

30.17
(1.188)

74.93
(2.950)
46.36
(1.825)

90.08
(3.547)

50.00
(1.969)

99.61
(3.922)

81.28
(3.200)

16.13
(.635)

101.160
(4.000)

309.70
(12.193)

450 A

400 A

200 A

Clip-to-Stud
309.7
(12.19)
278.4
(10.96)
231.7
(9.12)

126.3
(4.97)

105.4
(4.15)

158.3
(6.23)

14.0
(.55)

149.7
(5.89)

128.8
(5.07)

173.9
(6.85)

165.3
(6.51) 144.4
(5.69)

135.8
(5.35)
34.3
(1.35)

120.2
(4.73)

67.3
(2.65)

21.6
(.85)

36.0
(1.42) 50.0
(1.97)

54.6
(2.15)

101.6
(4.00)
76.2
(3.00)

ø8.6 THRU

22.1
(.87)

⊔ø19.1 10.2

20.9
(.82)

ø.34 THRU
[⊔
ø.75 0.40 ]
33.0
(1.30)

29.5
(1.16)

ø8.6 THRU

ø8.6 THRU

⊔ø19.1 10.2

33.0
(1.30)

ø.34 THRU
[⊔
ø.75 0.40 ]

74.9
(2.95)

16.1
(.64)

29.5
(1.16)

⊔ø19.1 10.2

ø.34 THRU
[⊔
ø.75 0.40 ]

84.6
(3.33)

40.8
(1.61)

110.8
(4.36)

46.4
(1.83)
16.1
(.64)

51.1
(2.01)
16.1
(.64)

200 A

450 A

400 A

Look for this logo to indicate products that are used in solar applications. Visit our website
littelfuse.com/solar for the latest updates on approvals, certifications, and new products.
littelfuse.com

51.11
(2.012)

76.20
(3.000)

278.43
(10.962)

108

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LFPHV DEAD FRONT 10x38mm (MIDGET) FUSE HOLDERS
1000 Vdc
Specifications
Voltage Ratings 	
1000 Vdc
Ampere Rating	
30 A
SCCR Rating	
33 kA
Power Acceptance	
4W Maximum
Indication Voltage Range	
400-1000 Vdc
Terminal Type	
Pressure Plate
Material	Thermoplastic
Flammability Rating	
UL94 V-0, self-extinguishing
Approval	
UL Listed (File: E345481)
	
CSA Certified
	
IEC 60269
Environmental	
RoHS compliant, Lead (Pb) free

Dimensions mm (inches)

Description

35.20
(1.39)

83.20
(3.28)

Features/Benefits
Finger-Safe design offers personnel protection
Compact design
35 mm DIN Rail Mountable
No fuse pullers or tools required for fuse removal
Indication option available
Approved for field wiring

6
52.80
(2.08)

70.40
(2.77)

Fuse Blocks and Holders

•	
•	
•	
•	
•	
•	

17.60
(0.69)

62.82
(2.47)

The Littelfuse LFPHV fuse holder is designed to house
1000 Vdc 10x38mm (midget style) fuses. It is not designed
for load break but is ideal for isolating photovoltaic module
strings for maintenance and meets UL requirements for
1000 Vdc solar fuse protection.

Web Resources
Download technical documents: littelfuse.com/lfphv

Recommended Fuses
SPF Solar Series................................................................60
FLU Series (DC only).........................................................31

Terminal Information

1
2†

TORQUE

Multi-Pole Assembly Kits

18-8 AWG
(.75 -.25 mm2)
6-4 AWG
18-6 AWG
(.75 -10 mm2)

18-22 lb-in
(2-2.5 N-m)
22-26 lb-in
18-22 lb-in
(2-2.5 N-m)

*Contact Tech-Line (800-TEC-FUSE) for other wire types.
†
Must be the same cross-sectioned size*

PIN
QTY.

1

WIRE SIZE

PINCER
QTY.

NUMBER
OF WIRES

POLES

Stranded*

Pressure
Plate

WIRE
TYPE
90˚ Max
CU Only

TERMINAL
TYPE

2

20

10

10 pack

LFPHV2PAK

3

40

10

10 pack

LFPHV3PAK

ASSEMBLY ORDERING
SETS
NUMBER

Connector Pincer

Handle Pin

VOLTAGE

1000 Vdc

AMPERE

30 A

SCCR
Rating

POLES

Ordering Information (LFPHV 10x38mm)

33 kA

1
2
3
4

FUSE TYPE SERIES

10x38mm
(midget)

© 2014 Littelfuse POWR-GARD® Products Catalog

LFPHV
LFPHV
LFPHV
LFPHV

NON-INDICATING

INDICATING

CATALOG NUM.

ORDERING NUM.

CATALOG NUM.

ORDERING NUM.

PACK
QUANTITY

LFPHV001
LFPHV002
LFPHV003
LFPHV004

LFPHV0001Z
LFPHV0002Z
LFPHV0003Z
LFPHV0004Z

LFPHV001ID
LFPHV002ID
LFPHV003ID
LFPHV004ID

LFPHV0001ZXID
LFPHV0002ZXID
LFPHV0003ZXID
LFPHV0004ZXID

12
6
4
3

109

littelfuse.com

Blocks and Holders

LFPSC/LFPSM CLASS CC/MIDGET DEAD FRONT FUSE HOLDERS
600 Vac/dc
Specifications

Voltage Rating	
UL: 600 Vac/dc
	
IEC: 690 Vac (LFPSM only)
Ampere Rating	
UL: 30 A
	
IEC: 32 A (LFPSM only)
SCCR Rating	
200 kA (Class CC)
	
100 kA (Midget)
Power Acceptance	
3W Maximum
Indication Voltage Range	
110-690 Vac/dc
Terminal Type	
Pressure Plate
Material	Thermoplastic
Flammability Rating	
UL94 V-0, self-extinguishing
Approvals 	
UL Listed (File: E14721)
	
CSA Certified
	
IEC 60269 (LFPSM Only)
Environmental	
RoHS compliant, Lead (Pb) free

Description
Littelfuse LFPSC Class CC and LFPSM 10x38mm dead-front
holders feature optional LED indication, DIN rail mounts and
a small space saving design. These high SCCR rated holders
provide optimum protection to personnel and have a large
clamping range with dual wire rated terminals.

Dimensions mm (inches)
17.60
(0.69)

62.82
(2.47)

35.20
(1.39)

Features
Indicating and non-indicating options available
Dual LED indication distinguishes polarity in DC applications
Small compact design offers ultimate flexibility
35 mm DIN-Rail Mountable
1-, 2-, 3- and 4-pole configurations
Easy installation and fuse removal with no additional
pullers or tools required

83.20
(3.28)

52.80
(2.08)

Web Resources

70.40
(2.77)

Download technical documents at: littelfuse.com/lfpsc
littelfuse.com/lfphv

Recommended Fuses

Class CC............................................................................. 27
Midget (10x38mm)............................................................. 30

Terminal Information

1
2†

TORQUE

18-8 AWG
(.75-25 mm2)
6-4 AWG
18-6 AWG
(.75-10 mm2)

18-22 lb-in
(2-2.5 N-m)
22-26 lb-in
18-22 lb-in
(2-2.5 N-m)

*Contact Tech-Line (800-TEC-FUSE) for other wire types.
†
Must be the same cross-sectioned size

Multi-Pole Assembly Kits
PIN
QTY.

1

WIRE SIZE

PINCER
QTY.

NUMBER
OF WIRES

POLES

Pressure
Plate

WIRE
TYPE
Stranded*

TERMINAL
TYPE

75˚ Max
CU Only

2

20

10

10 pack

LFPHV2PAK

3

40

10

10 pack

LFPHV3PAK

ASSEMBLY ORDERING
SETS
NUMBER

Connector Pincer

Handle Pin

Ordering Information (LFPSC Class CC and LFPSM Midget)
VOLTAGE

AMPERE

UL

UL

IEC

IEC

SCCR
Rating

600
Vac/dc

—

30 A —

200 kA

600
Vac/dc

690
Vac

30 A 32 A

100 kA

littelfuse.com

POLES

Fuse Blocks and Holders

6

•	
•	
•	
•	
•	
•	

1
2
3
4
1
2
3
4

FUSE TYPE SERIES

Class CC

10x38mm
(Midget)

LFPSC
LFPSC
LFPSC
LFPSC
LFPSM
LFPSM
LFPSM
LFPSM

NON-INDICATING

INDICATING

CATALOG NUM.

ORDERING NUM.

CATALOG NUM.

ORDERING NUM.

PACK
QUANTITY

LFPSC001
LFPSC002
LFPSC003
LFPSC004
LFPSM001
LFPSM002
LFPSM003
LFPSM004

LFPSC0001Z
LFPSC0002Z
LFPSC0003Z
LFPSC0004Z
LFPSM0001Z
LFPSM0002Z
LFPSM0003Z
LFPSM0004Z

LFPSC001ID
LFPSC002ID
LFPSC003ID
LFPSC004ID
LFPSM001ID
LFPSM002ID
LFPSM003ID
LFPSM004ID

LFPSC0001ZXID
LFPSC0002ZXID
LFPSC0003ZXID
LFPSC0004ZXID
LFPSM0001ZXID
LFPSM0002ZXID
LFPSM0003ZXID
LFPSM0004ZXID

12
6
4
3
12
6
4
3

110

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LFPSJ CLASS J DEAD FRONT FUSE HOLDERS
600 Vac/dc
Specifications
Voltage Ratings	
600 Vac/Vdc
Interrupting Rating	
200 kA
Ampere Rating	
30 and 60 A
LEDs	
110 V – 600 V
Terminal Type	
Pressure Plate
Material	Thermoplastic
Flammability Rating	
UL94 V-0
Terminal Screws	
Phillips / Slotted
Approvals 	
UL Listed (File: E14721)
	
CSA Certified (File: 2529839)
Environmental	
RoHS compliant

Description

30

30

60

60

30 Amp
72.08
(2.838)

7.0
(.276)

36.0
(1.417)

LFPSJ-ID
30A 600V

72.0
(2.835)

LFPSJ-ID
30A 600V

108.0
(4.251)

LFPSJ-ID
30A 600V

LFPSJ-ID
30A 600V

LFPSJ-ID
30A 600V

–
–
–
•
•
•
–
–
–
•
•
•

LFPSJ301.Z
LFPSJ302.Z
LFPSJ303.Z
LFPSJ301.ZXID
LFPSJ302.ZXID
LFPSJ303.ZXID
LFPSJ601.Z
LFPSJ602.Z
LFPSJ603.Z
LFPSJ601.ZXID
LFPSJ602.ZXID
LFPSJ603.ZXID

6
3
2
6
3
2
6
3
2
6
3
2

WIRE TYPE

1
2
3
1
2
3
1
2
3
1
2
3

PACK
QTY.

WIRE
RANGE

TORQUE

0.75mm2 – 1mm2
1.5mm2 – 50mm2
18 – 1 AWG

2.5 N-m
4.0 N-m
35 lb-in

6
2.5mm2 – 50mm2
14 – 1 AWG

4.0 N-m
35 lb-in

Multi-Pole Assembly Kit
Kits are used to create multi-pole holders from 1-pole LFPSJ
fuse holders. Please contact factory for more information.

LFPSJ-ID
30A 600V

117.0
(4.606)

60 Amp

7.0
(.276)

86.0
(3.386)

LFPSJ-ID
60A 600V

120
(4.72)

80.0
(3.150)

40.0
(1.575)

LFPSJ-ID
60A 600V

LFPSJ-ID
60A 600V

LFPSJ-ID
60A 600V

LFPSJ-ID
60A 600V

LFPSJ-ID
60A 600V

116
(4.567)

POLES

49.0
(1.929)

Handle Pin

AMP

Connector Pincer

30

2

30

10

10

LF3J2PAK

30

3

60

10

10

LF3J3PAK

60

2

30

10

10

LF6J2PAK

60

3

60

10

10

LF6J3PAK

PINCER
QUANTITY

PIN
QUANTITY

ASSEMBLY
SETS

ORDERING
NUMBER

Web Resources
Download CAD drawings and other technical information:
littelfuse.com/lfpsj

Recommended Fuses

58.0
(2.283)

Class J - JTD, JTD_ID, JLS................................................ 21

Note: These dimensions are for reference only. Please contact factory for additional information.

© 2014 Littelfuse POWR-GARD® Products Catalog

111

littelfuse.com

Fuse Blocks and Holders

Dimensions Inches (mm)

ORDERING
NUMBER

Stranded

•	 Indicating and non-indicating options available
•	 Dual LED indication distinguishes polarity in
DC power applications
•	 Small compact design offers ultimate flexibility
•	 35mm DIN Rail Mountable
•	 1-, 2-, and 3-pole configurations
•	 Easy installation and fuse removal with no
additional pullers or tools required

INDICATION

AMP

Features

POLES

Ordering Information

Littelfuse Class J POWR-SAFE Dead Front holders
provide optimum protection to personnel and are
UL Listed and CSA Certified.

Blocks and Holders

BUS BAR SYSTEM
POWR-BAR Distribution
Ordering Information

Description
A key objective for panel designers is safe distribution
of power to multiple fuse holders in a compact design.
The Littelfuse UL 508 Listed bus bar system eliminates
most wire terminations in a timesaving package. A power
distribution block and associated conductors are no longer
needed to feed multiple POWR-SAFE fuse holders.

Features/Benefits

Fuse Blocks and Holders

1 PHASE, 25 mm2
LENGTH
ORDERING
(mm)
POLES
NUMBER
1PH3P25mm
3
50
1PH4P25mm
4
79
1PH6P25mm
6
104
1PH9P25mm
9
155
1PH12P25mm
12
208
1PH15P25mm
15
270
1PH57P25mm
57
1009

3 PHASE, 18 mm2
LENGTH
ORDERING
(mm)
POLES
NUMBER
3PH6P18mm
6
104
3PH9P18mm
9
158
3PH12P18mm
12
214
3PH15P18mm
15
266
3PH57P18mm
57
1009

3 PHASE, 25 mm2
LENGTH
ORDERING
(mm)
POLES
NUMBER
3PH6P25mm
6
104
3PH9P25mm
9
158
3PH12P25mm
12
214
3PH15P25mm
15
266
3PH57P25mm
57
1009

Endcaps are standard with all 3 phase configurations except 57-pole.
Endcaps are not needed for the 1 phase configurations from the factory or
if the copper bus is trimmed per the supplied instructions.
Power feed lugs and protective covers are extra.

•	 Touch-safe design offers protection when replacing fuses

6

1 PHASE, 18 mm2
LENGTH
ORDERING
(mm)
POLES
NUMBER
1PH3P18mm
3
50
1PH4P18mm
4
79
1PH6P18mm
6
104
1PH9P18mm
9
155
1PH12P18mm
12
208
1PH15P18mm
15
270
1PH57P18mm
57
1009

•	 Compact design
•	 35 mm DIN Rail Mountable
•	 Available in one and three phase configurations

Accessories

•	 No fuse pullers or tools required for fuse removal

Power Feed Lug

•	 Can be cut down to optimal size

Recommended Fuse Holders
LFPSM / LFPSC (600 Vac/dc).............................................110
LFPHV (1000 Vdc)............................................................. 109

PART
NUMBER

AMP
RATING

BB17
BB18
BB19
BB20

115
115
115
115

VOLTAGE WIRE RANGE
(AC / DC)
1000
1000
1000
1000

#10 - 1/0 AWG
#10 - 1/0 AWG
#10 - 1/0 AWG
#10 - 1/0 AWG

WIRE
TYPE

TORQUE

CU
CU
CU
CU

50 lb-in
50 lb-in
50 lb-in
50 lb-in

Web Resources
Download CAD drawings, dimensions and other technical
information: littelfuse.com/busbar

Specifications
Voltage Ratings 	
	
Current Ratings
CROSS SECTION (mm2)
END FED
CENTER FED

600 Vac/dc
1000 Vdc*
18 mm 2
80 A
160 A

BB17	
25 mm 2
100 A
200 A

BB19		

BB20

Endcaps
PART
NUMBER
EDCP42
EDCP7

SCCR		
10 kA, 100 kA†
Conductor		Copper
Pitch		
17.8 mm
Approvals		
UL 508 Listed (File E328654)
Environmental		
RoHS Compliant, Lead (Pb) free

PHASE QUANTITY
Single
Three

50
50

EDCP42	

EDCP7

Pole Protective Covers

*1 Phase 18 mm2 rated 1000 Vdc up to 160 A when center fed
1 Phase 25 mm2 rated 1000 Vdc up to 200 A when center fed
†
When protected directly upstream by Class J 175 amperes max
(18 mm2 bus bar) and Class J 200 amperes max (25 mm2 bus bar).

littelfuse.com

BB18		

PART
NUMBER
CTPT5

112

QUANTITY
5

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

LPSM QUICK CONNECT POWR-SAFE FUSE HOLDERS

Specifications
Voltage Rating 	
600 Vac/dc
Amperage Rating	
30 A
Approval	UL Recognized (File No. E14721)
CSA Certified (File No. LR7316)
CCC Approved
Terminal Type	
1/4” Quick Connect Terminals
Fuse Type	
Midget (10 X 38 mm) series
Material	Thermoplastic
Flammability Rating	 UL94 V-0
SCCR Rating	
Same as Fuse Rating

Ordering Information
POLES

CATALOG NUMBER

ORDERING NUMBER

1

LPSM001QCID

LPSM0001ZQCID

2

LPSM002QCID

LPSM0002ZQCID

3

LPSM003QCID

LPSM0003ZQCID

4

LPSM004QCID

LPSM0004ZQCID

Description

Recommended Fuses

The LPSM midget fuse holder series is a dead front
design providing protection to personnel when installing
and removing fuses. The compact fuse holder mounts
quickly onto 35 mm DIN rail, decreasing panel layout
and assembly time. This product has two Quick Connect
terminals on both the top and bottom of the holder,
offering an additional connection option. It is available in
1-, 2-, 3- and 4-pole configurations.

Midget-Style (10x38mm)................................................... 30

Web Resources
Download CAD drawings and other technical information:
littelfuse.com/lpsmqc

Fuse Blocks and Holders

Features/Benefits
•	 Dual 1⁄4” Quick Connect Terminals on Top and
Bottom of Holder

11.99 (4.72)

•	 Meets Dead Front requirements
•	 Mountable on 35 mm DIN Rail
•	 Local LED Indication
17.80 (.701)

Dimensions mm (inches)

59.70 (2.35)

80.00 (3.15)

6.77 (.267)
6.20 (.244)
9.90 (.390)

© 2014 Littelfuse POWR-GARD® Products Catalog

113

6

littelfuse.com

Blocks and Holders

354 SERIES 3AG OMNI BLOCK®
Molded Base Type Fuse Block
Description
A low profile fuse block featuring individual barriers that
reinforce the fuse clips while providing greater protection
against clip damage and electrical shock. The unique design
permits self-alignment of clips to fuse cap. This, plus a
one-piece clip/terminal, assures low contact resistance.

Specifications
Dielectric Strength	 1500 V Minimum
Clip/Terminals	
Tin-Plated Spring Brass; two different style clips 	
	
can be supplied for circuit identity or polarization
Base	Glass reinforced Thermoplastic:
Gray except anit-rotation series which is black
Flammability Rating	 UL94 V-0
Ambient Temperature	–40˚C to +85˚C

Dimensions Inches
.312" REF. DIA. C BORE
.06" REF. DEEP (.10 REMAINS)
X X

Ordering Information

X X

.53" REF.
1.46"
REF.

.146" REF.
DIA. THRU

.06" DIA. (2)

X X

6

.625"
TYP.
X X

Fuse Blocks and Holders

1.4"

X X

A

45 .55" MAX.

.08" REF.

.25"
TYP.

TERMINALS

VOLTAGE

354 000

Solder

300 V*

30 A

30 A

354 600

3/16” Q.C.

300 V

20 A

20 A

354 800

1/4” Q.C.

300 V

20 A

20 A

UL

CSA

354 900

1/4” Q.C.

300 V

30 A

25 A

354 101-GY

P.C. Board

300 V

15 A

15 A

*30 A capability is based on temperature rise with #10 AWG wire properly soldered.

1.4"
2.19" REF.

CURRENT RATING

CATALOG
NUMBER

.08" REF. DIA.
.156" DIA.

.10" DIA.

Recommended Fuses
3AG Cartridge.................................................................... 33

.65"

Web Resources
For additional technical information visit: littelfuse.com

Technical Information
SOLDER TYPE TERMINALS

3/16” Q.C.
TERMINALS †

1/4” Q.C.
TERMINALS

1/4” Q.C.
TERMINALS †

POLES

354 001GY

354 601GY

354 801GY

354 901GY

1

.50”

354 002GY

354 602GY

354 802GY

354 902GY

2

1.12”

DIM “A”

354 003GY

354 603GY

354 803GY

354 903GY

3

1.75”

354 004 GY

354 604GY

354 804GY

354 904GY

4

2.38”

354 005GY

354 605GY

354 805GY

354 905GY

5

3.00”

354 006GY

354 606GY

354 806GY

354 906GY

6

3.63”

354 007GY

354 607GY

354 807GY

354 907GY

7

4.25”

354 008GY

354 608GY

354 808GY

354 908GY

8

4.88”

354 009GY

354 609GY

354 809GY

354 909GY

9

5.50”

354 010GY

354 610GY

354 810GY

354 910GY

10

6.13”

354 011GY

354 611GY

354 811GY

354 911GY

11

6.75”

354 012GY

354 612GY

354 812GY

354 912GY

12

7.38”

354 021BL*

354 621BL*

354 821BL*

354 921BL*

1

.50”

354 101GY

—

—

—

1

.50”

† NEMA style
* With Anti-Rotation Boss

littelfuse.com

114

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

FUSE PULLERS & POWR-JAW CLIP CLAMPS
MFP • LPFP • GFP • 097023
Features/Benefits
•	 Ergonomically designed fuse pullers designed to safely
remove power fuses
GFP

•	 Molded design offers more comfortable and natural
grip than traditional pullers, increasing performance

Specifications

097023

MFP

TYPE OF FUSE
PULLER

PART NUMBER

Midget Fuse

MFP

3 16

Pocket Fuse

LPFP

250 V fuses from 0-200 A
600 V fuses from 0-100 A
9 16
⁄ " - 119⁄ 32" fuses

Giant Fuse

GFP

250 V fuses from 61-600 A
600 V fuses from 61-400 A
11⁄16" - 219⁄ 32" fuses

Tri-puller

097023

LPFP

FUSE SIZE (DIAMETER)
⁄ " - 1⁄ 2" fuses

For ATO, MINI and glass fuses

6

Web Resources
For additional technical information visit:
littelfuse.com/fusepullers

Ordering Information
CATALOG
NUMBER

ORDERING
NUMBER

VOLTS

LCC1

0LCC1

250

0-30

LCC2

0LCC2

250

35-60

LCC2

0LCC2

600

0-30

LCC4

0LCC4

600

35-60

LCC5

0LCC5

250 or 600

70-100

LCC6

0LCC6

250 or 600

110-200

LCC7

0LCC7

250 or 600

225-400

LCC8

0LCC8

250 or 600

450-600

AMPERES

Note: POWR-JAW Clip Clamps are sold individually, not in pairs.
A minimum of 1/8” of clearance between the fuse block barrier and fuse clip is required to
install Clip Clamps.

Features/Benefits
•	 Improve contact between fuse and clip
•	 Help prevent unnecessary heat from poor contact
due to the loss of spring force. This reduces:
	
1. Nuisance fuse opening
	
2. Premature aging of surrounding components

Web Resources
For additional technical information visit:
littelfuse.com/clipclamps

•	 High temperature phenolic resin knob for durability
•	 Wide range of coverage with simple design

© 2014 Littelfuse POWR-GARD® Products Catalog

115

littelfuse.com

Fuse Blocks and Holders

LCC Series POWR-JAW

Blocks and Holders

LFFB SERIES LIMITER BLOCK/LHFB INLINE HOLDER
LFFB
Description
The LFFB003 fuse block is designed to accept CNN and CNL
style limiter fuses. Applications include but are not limited to
forklifts, golf carts and other low-voltage battery equipment.
It is specifically designed for the HAZGARD™ fuse but can
be used for CNN/CNL fuses as well.

Specifications
Voltage Rating	
150 Vac/Vdc
Ampere Rating	
800 A
Approvals	
UL Recognized (File: E14721)
Construction	Base—Thermoplastic
	
Studs—Steel Zinc Plated

Dimensions mm (inches)
86.61 (3.410)
62.0 (2.44)
25.4 (1.0)

Ordering Information
11.94 (0.470)
23.88 (0.940)

2x 13.0 (0.512)

2x

5.84 (0.230)

CATALOG NUMBER

ORDERING NUMBER

LFFB003

LFFB0003Z

12.6 C’BORE X 82, (2) HOLES

Web Resources
Sample requests and other technical information:
littelfuse.com/lffb
2x 49.14 (1.935)

Fuse Blocks and Holders

6

Recommended Fuses
CNL/CNN Cable limiter fuses............................................ 62
HAZGARD fuse.................................................................. 62

12.19 (0.480)
2x 16.19 (0.637)

LHFB
Specifications
Voltage Rating 		
32 V
Ampere Rating		
30 A
1
Fuses		
/4” to 11/4” fuses
Wire Size		
Accepts #16 to #18 gauge wire
Operating Temperature	
-20˚ C to 80˚ C

Installation Instructions
1. Thread wire through fuse holder body
2. Strip wire insulation per strip gauge
3. Crimp wire to fuse clip*
4. Pull wire through and seat fuse clip in the holder body
5. Insert desired fuse type and rating
6. Snap holder body together

Description
The Littelfuse LHFB waterproof in-line fuse holder is ideal
for harsh environments. The LHFB holder features the
voltage and ampere rating molded into the body, along with
a wire strip gauge. It also withstands solvents and vibration.

*Recommended crimping tools: Thomas & Betts No. WT-111M
Note: Wire is not supplied with the holder.

Features/Benefits

Web Resources

•	 Waterproof in-line fuse holder for harsh environments

Sample requests and other technical information:
littelfuse.com/lhfb

•	 One-piece molded thermoplastic body
•	 Bright green color offers high visibility
•	 Voltage and ampere rating molded into body

littelfuse.com

116

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

571 & 572 SERIES PANEL-MOUNT FUSE HOLDERS
571

Ordering Information
CATALOG/ORDERING NUMBER

BOTTOM

571028 05710028L 571028P 05710028LXP

Rt. Angle

TERMINAL
STANDARD
WATERTIGHT
571027 05710027L 571027P 05710027LXP
Straight

Description
Panel mount fuse holders are for Midget-Style
and Class CC fuses. Class CC fuses have a
rejection feature on one end cap, which mates
with the rejection feature of Littelfuse Class CC
fuses holders to prevent the installation of fuses
with lower voltage ratings or interrupting ratings.
Watertight version must be front panel mounted.

571007 05710007L 571007P 05710007LXP

Straight

571008 05710008L 571008P 05710008LXP

Rt. Angle

5710CC 057100CCL 5710CCP 057100CCLXP

Straight

571RCC 05710RCCL 571RCCP 05710RCCLXP

Rt. Angle

0.86"

1.312"

[21.84]

[33.33]

0.92"

Line

[28.45]

1.34"

[34.04]

[33.3]

[44.20]

[53.34]

113⁄32” – 11⁄2”

Midget
Fuses

11⁄2”

Class CC
Fuses

Voltage Rating 	
600 V
Ampere Rating	
30 A for Class CC and Midget fuses
Dielectric Strength	 4000 V Minimum
Terminals	
Tin-plated brass combination solder & quick-connect
O-Rings	
901-184 (body), 901-260 (knob)
Molded Parts	
Black thermoplastic
Approvals	
UL Recognized (File: E14721)
	
UL Recognized for branch circuit protection
	(571OCC/RCC)
	
CSA Certified (File: LR7316)

0.890"
[22.6]

Web Resources

1.74"

2.10"

Midget
Fuses

Specifications

.172 DIA.
[4.37]

1.12" 1.310"

[23.37]

15⁄16” – 13⁄8”

*Fuse diameter is 13/32”
Note: Contact factory for versions with pre-assembled wire leads.

Dimensions Inches (mm)
Load

FUSE LENGTH FOR USE
RANGE*
WITH

Additional technical information: littelfuse.com/571

Mounting Hole

6

CATALOG/ORDERING NUMBER

BOTTOM

572028 05720028L 572028P 05720028LXP

Rt. Angle

TERMINAL
STANDARD
WATERTIGHT
572027 05720027L 572027P 05720027LXP
Straight

Description
The 572 series panel mount fuse holders are
designed to minimize installation time. Its unique
design incorporates a snap-mount feature that
allows the holder to be installed without any tools
or mounting hardware.

572007 05720007L 572007P 05720007LXP

Straight

572008 05720008L 572008P 05720008LXP

Rt. Angle

5720CC 057200CCL 5720CCP 057200CCLXP

Straight

572RCC 05720RCCL 572RCCP 05720RCCLXP

Rt. Angle

1.20”
(30.5)
2.10”

0.913”

0.69”

2.40”

© 2014 Littelfuse POWR-GARD® Products Catalog

Midget
Fuses

113⁄32” – 11⁄2”

Midget
Fuses

11⁄2”

Class CC
Fuses

Specifications

Mounting Hole

Line

15⁄16” – 13⁄8”

†Fuse diameter is 13/32”
Note: Contact factory for versions with pre-assembled wire leads.

Dimensions Inches (mm)
Load

FUSE LENGTH FOR USE
RANGE†
WITH

Voltage Rating 	
Ampere Rating	
Dielectric Strength	
Terminals	
Molded Parts	
Approvals	
	
	
	
Mounting	
	

600 V
30 A for Class CC and Midget fuses
4000 V Minimum
Tin-plated brass combination solder & quick-connect
Black thermoplastic
UL Recognized (File: E14721)
UL Recognized for branch circuit protection
(5720CC/RCC) Class CC version
CSA Certified (File: LR7316)
Double "D" punch - Greenlee #61092
(14-18 gauge panel thickness recommended)

Web Resources

0.756”

Additional technical information: littelfuse.com/572

117

littelfuse.com

Fuse Blocks and Holders

Ordering Information

572

Blocks and Holders

342 SERIES 3AG (1/4" X 11/4") PANEL MOUNT FUSE HOLDERS
Traditional Panel Mount Type

QPL

Specifications

Straight Terminal
Knurled Knob

Right Angle
Terminal
Fluted Knob

3AG Cartridge.................................................................... 33

Panel Mount Fuse holders for 3AG (1/4" x 11/4") fuses. Both
fluted and knurled knob terminal options are available.

Web Resources

Ordering Information

Additional technical information available at:
littelfuse.com/342

Straight Terminal

Right Angle Terminal
KNURLED KNOB

CATALOG/ORDERING
NUMBER

Fuse Blocks and Holders

Recommended Fuses

Description

FLUTED KNOB

6

Electrical	
Rated at 20 A for any voltage up to 250 V
Dielectric Strength	 2400 V minimum
Mounting	
Withstands 15 lb-in mounting torque;
	
maximum panel thickness .187”
Molded Parts	
Black thermoplastic (UL94 V-0)
Knob	
Bayonet style with lettering
Terminals	
Copper & copper alloy. Tin plated, except ¼”
	
Quick-Connect terminals are nickel plated
Ambient Temperature	–40˚C to +85˚C

TERMINAL

CATALOG/ORDERING
NUMBER

342014A

03420014X

342012A

03420012X

342038A

03420038X

342058A

03420058X

3 16

342838A

03420838X

342858A

03420858X

14

FLUTED KNOB

KNURLED KNOB

CATALOG/ORDERING
NUMBER

CATALOG/ORDERING
NUMBER

TERMINAL

Solder

342004

03420004X

342022A

03420022X

/ ” Q.C.

342028A

03420028X

342048A

03420048X

3 16

/ ” Q.C.

342828

03420828X

342848A

03420848X

14

Solder
/ ” Q.C.
/ ” Q.C.

.69" DIA.

Right Angle Terminal

Straight Terminal
.78"

.7"

1"

.78"

.7"

1"
.090" X .12"
HOLE

.63"

.45"
FLATS
TYP.

.020"

.11" DIA.

.187"

.45"
FLATS
TYP.

.69"
DIA.

.14" DIA. HOLE

1"

.3"

.69"
DIA.
TYP.

.7"

.78"

1"

1"

1"

.502"
.510"
.63"

Dimensions
in inches

.250"

.56"

.502"
.510"

.032"
DETENT

.69"
HEX
FLATS

.69"
HEX
FLATS

.475"
.480"

.4".032"

.020"
.06" DIA.HOLE

.78"

.475"
.480"

1"
1"

1.31"

.085" X .12"
HOLE

.69" DIA.

.78"

.7"

.085" X .12"
HOLE

.06" DIA.HOLE

DETENT

.45"
FLATS
TYP.

.69"
DIA.

.14" DIA. HOLE

.502"
.510"

.032"

.020"
.187"

.475"
.480"

.250"
.69"
HEX
FLATS

.56"

.69"
DIA.
TYP.

.59"

.59"

QPL

Specifications

342 Series (Watertight Panel Mount Type)

Electrical	
Rated at 20 A for any voltage up to 250 V
Dielectric Strength	 1500 V minimum
Mounting	
Withstands 15 lb-in mounting torque;
	
maximum panel thickness is .250”
Molded Parts	
Black thermoset (UL94 V-0)
Knob	
Screw type
Seal	
O-ring provides a watertight seal on the
	
front side of the panel per MIL-PRF-19207
Terminals	
Copper & copper alloy. Tin plated. Solder type
Ambient Temperature	–40˚C to +85˚C
Hardware	
O-rings (2) and hex nut, unassembled

Dimensions Inches

Ordering Information
CATALOG NUMBER

ORDERING NUMBER

342006A

0342006ZXA

Web Resources

Recommended Fuses

Additional technical information available at: littelfuse.com/342

3AG Cartridge.................................................................... 33

littelfuse.com

118

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

345 SERIES PANEL MOUNT FUSE HOLDERS
International Shock-Safe Panel Mount Type
Specifications

Description

Insulation Resistance	10,000 megaohm minimum at 500 Vdc
Contact Resistance 	 Less than .005 ohm average at currents up to 1 A
Mounting	Threaded styles withstand 15 in-lb mounting torque
Profile panel thickness .032” min/310” max.
Quick mount panel thickness .012” min/360” max.
Rear mount panel thickness.012” min/260” max.
Body Material 	
Black glass-filled thermoplastic (UL94 V-0)
Knob Material	Grey, blue or black glass-filled thermoplastic (UL94 V-0)
Hex Nut Material 	
Black glass-filled thermoplastic
Knob	Finger-Grip, Fuse Extractor type or Screwdriver Slot,
Fuse Extractor type with plated copper alloy insert
Plated copper alloy contact clips.
	Spring loaded, locking mechanism provides an antitease feature and will not vibrate loose
Terminals	Copper alloy, Tin-plated
Ambient Temperature	–40˚C to +85˚C
Hardware	Threaded style fuse holders are supplied with
a thermoplastic hex nut unassembled
	Quick mount style fuse holders are supplied with
a push-on type retaining nut, black oxide finish,
unassembled
	A synthetic rubber O-ring will be supplied only
with the screwdriver slot knob when the drip-proof
version is requested

Designed to eliminate electrical
shock as defined by IEC standards
60065 and 60127, these panelmount fuses holders offer a wide
variety of options. This allows for
inventory reduction and versatility.

Features/Benefits
•	 Anti-tease feature eliminates
circuit interruption when knob
is accidentally depressed
•	 Five fuse holder types
for maximum flexibility
•	 Two knob styles—
screwdriver slot and fingergrip
•	 Drip proof option available on
screwdriver slot knob style
•	 Two terminal choices
depending on application

Web Resources
For more informations, visit:
littelfuse.com/shocksafe

Recommended Fuses

FILE
NUMBER

3AG

5 X 20 mm

2AG

UL

E75961

20 A 250 V

10 A 250 V

10 A 250 V

CSA

LR91788

20 A 250 V

10 A 250 V

10 A 250 V

VDE

116895E

10 A 250 V

10 A 250 V

—

Note: To order with a metal internal tooth lockwasher (L) and/or neoprene panel washer (N)
and/or drip-proof synthetic rubber “O” ring with Neoprene washer (NP) [Screwdriver slot
knob only], add the appropriate suffix (L, N, or NP) respectively.
Please refer to Technical Application Guide section for information
on proper fuse holder de-rating.

Ordering Information
EXAMPLE:
(Complete Assembly with Options)

Series Number

FUSE SIZE
2
2AG
.177” x .570”
3
3AG
.250” x 1.250”
5
5 x 20 mm
.197” X .787”

345 3 LS

7 LNP

STYLE
LF
Low Profile Body
Black Fingergrip Knob
RF
Rear Mount Body
Black Fingergrip Knob

TERMINALS
1
3/16” (Right Angle)
Dual Purpose Solder/QC
2
3/16” (Straight)
Dual Purpose Solder/QC
3
3/16” (Right Angle)
NEMA QC
4
3/16” (Straight)
NEMA QC
7
1/4” (Right Angle)
NEMA/DIN QC
8
1/4” (Straight)
NEMA/DIN QC

HS
High Profile Body
Screwdriver Slot Knob
LS
Low Profile Body
Screwdriver Slot Knob
QS
Quick Mount Body
Screwdriver Slot Knob
Screwdriver Slot Knob
2AG–Blue Knob
3AG–Grey Knob
5 x 20 mm–Black Knob

© 2014 Littelfuse POWR-GARD® Products Catalog

119

OPTIONS*
L
Lockwasher
N
Neoprene Washer
NP
Drip-Proof O-Ring†
with Neoprene Washer
*Options (L, N, NP) can be ordered
individually or in combination.
†Screwdriver slot knob only.

littelfuse.com

6
Fuse Blocks and Holders

Glass / Electronic Fuses..................................................... 32

AGENCY
APPROVAL

Blocks and Holders

SEMICONDUCTOR FUSE BLOCKS
LSCR Series
Specifications
Voltage Rating	
	
Ampere Ratings	
	
Approvals	
	
Stud Size	
	
Base	
Terminal Construction	

LSCR001: 	 Accepts fuses 1” diameter or less at 600 V
LSCR002: 	 Accepts fuses up to 3” diameter at 600 V
LSCR001: 	 1 – 400 A capacity
LSCR002: 	 70 – 800 A capacity
UL Recognized (File: E14721)
CSA Certified (File: 73160)
LSCR001: 	 1⁄4 -20 thread (Torque 61 in-lbs.)
LSCR002: 	 3 ⁄8 -16 thread (Torque 192 in-lbs)
Molded phenolic. 150˚ C temperature rating
Plated steel. Supplied with nut and belleville washer

Recommended Fuses
Semiconductor and Class T fuses. See tables below.
LSCR001 Semiconductor Fuse Block Selection Guide
FUSE SERIES

Description

L15S
L17T
L25S
LA30QS
L50S
LA5OQS
L60S
KLC
0.203" × 0.30"JLLN
SLOT
JLLS

Modular-designed Semiconductor fuse blocks are designed
to accommodate a wide range of Semiconductor fuses, with
a maximum diameter of 3".

Features/Benefits
•	 Modular design reduces inventory requirements

6

•	 Sold in pairs for convenience

Fuse Blocks and Holders

•	 Constructed of molded phenolic (with plated

1.88"
1.30"
steel0.70"
studs)

0.50"

1/4-20" ×LSCR002
1.00"
USABLE LENGTH

LSCR001
0.203" × 0.30" SLOT

2.48"

0.70"

1.32"
2.13"

1/4-20" × 1.00"
USABLE LENGTH

1.60"
1.00"
0.25"

1.00"
2.48"

LSCR002

0.25"

0.203" × 0.30" SLOT

1.60"
1.00"

1.00"

L15S
L17T
L25S
LA30QS
L50S
0.203" × 0.30" SLOTLA50QS
L60S
KLC
0.50"
JLLN
JLLS

AMPERE RATING

PAGE

500-800
300-800
225-800
225-800
225-800
225-800
225-800
125-800
225-800
225-800

69
50
69
72
69
73
69
69
24
24

0.75"

2.13"

1.32"

69
50
69
72
69
73
69
69
24
24

Semiconductor Fuse Block Selection Guide

FUSE SERIES

0.50"

PAGE

70-400
70-250
35-60
35-60
35-100
35-100
35-60
35-60
70-100
70-100

0.70"

Dimensions Inches

1.88"
1.30"
0.70"

AMPERE RATING

0.50"

Web Resources

3/8-16"x1.00"
USABLE LENGTH

For more information, visit: littelfuse.com/lscr
3.632"
2.38"

0.75"

0.25"
0.50"

3/8-16"x1.00"
USABLE LENGTH

3.632"
2.38"

0.25"
0.50"

littelfuse.com

120

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

SEMICONDUCTOR FUSE BLOCKS
1LFS and 1LS Series

Specifications
Voltage Rating 	
Ampere Range	
Approvals	
Insulator Base	
Box Lug Terminal	

600 V
1 – 400 A
UL Recognized
150˚ C general purpose phenolic
Tin plated aluminum

Dimensions Inches (mm)
Dimensions for reference only.

1LFS101

Description
Littelfuse modular style semiconductor fuse blocks
accommodate a wide range of semiconductor fuses.
Blocks are provided in pairs with fuse mounting hardware.

Features/Benefits
•	 Modular design reduces inventory requirements

6

•	 Sold in pairs for convenience
•	 Constructed of molded phenolic (with plated steel studs)

CATALOG AMPERE
NUMBER RATING
1LFS101

100 A

WIRE RANGE

WIRE
RATING

APPROVALS

#2/0 - 14 CU/AL

120 in-lbs

UL Recognized

1LFS102

400 A

250MCM - #6 CU/AL

275 in-lbs

UL Recognized

1LS110

400 A

250MCM - #6 CU/AL

275 in-lbs

Self-Certified

Fuse Blocks and Holders

1LFS102

Ordering Information

Web Resources
Download CAD drawings and other technical information:
littelfuse.com/1lfs

Recommended Fuses
1LS110

Wide range of semiconductor fuses................................. 68

© 2014 Littelfuse POWR-GARD® Products Catalog

121

littelfuse.com

Blocks and Holders

POWR-BLOKS ™
Distribution Blocks • Splicer Blocks • Covers
Specifications
Voltage Rating	
Current Rating	
Material	
	
Connector	
	
Flammability Rating	
Approvals	
	
Environmental	

Ordering Information

Description

Fuse Blocks and Holders

6

600 V
Based on NEC Table 310.16, using 75°C copper wire
Phenolic rated at 150°C and Thermoplastic
rated at 125°C (LD1400 and LS1300 series only)
Standard: Highly con­duc­tive aluminum, tin plated
Copper: Highly conductive copper, tin plated
UL94 V-0
UL Recognized - LD/LS Series (File: E171395)
LFD/LFS Series (File: E309688)
CSA Certified - LD/LS Series (File: LR700111)
LFD/LFS Series (File: 007316_0_000)
RoHS compliant, Lead (Pb) free

See Selection Guide on next pages

POWR-BLOKSTM power distribution blocks offer a safe,
convenient way of splicing cables, providing a fixed junction
tap-off point or splitting primary power into secondary
circuits. Lx2xxx-DIN series offers integral DIN-Rail mount
and an optional hinged safety cover.
Optional power distribution block covers provide protection
against accidental shorting between poles caused by
loose wires, tools, or other conductive material. They also
protect personnel from accidentally contacting energized
connectors. To order protective covers, match the number
of poles for the block to the cover.

Web Resources
For technical information, visit:
littelfuse.com/powrbloks

Hinged Plastic Covers
CATALOG/
ORDERING
NUMBER
0LCH1321Z
0LCH1322Z
0LCH1323Z

Applications
Typical applications include heating, air conditioning and
refrigeration systems, el­e­va­tor systems, material handling
equipment, control panels, motor controls, switchgear,
and anywhere power needs to be distributed to more
than one load.

FOR USE WITH
DISTRIBUTION/SPLICER BLOCK NO.

POLES

LD2xxx-1DIN / LS2xxx-1DIN
LD2xxx-2DIN / LS2xxx-2DIN
LD2xxx-3DIN / LS2xxx-3DIN

1
2
3

Note: Optional hinged covers snap on to blocks.

Clear Plastic Covers
CATALOG/
ORDERING
NUMBER
LPBC02
LPBC03
LPBC21
LPBC22
LPBC23
LPBC31
LPBC32
LPBC33
LPBC41
LPBC42
LPBC43
LPBC51
LPBC52
LPBC53

Connectors
Box lug connectors are designed for use with a single, solid
or class B or C stranded conductor. Use of more than one
con­ductor per connector opening or use of extra-flexible,
fine-stranded conductors, such as welding cable, voids the
UL Listing and may cause overheating. Manufacturers of
cable ter­minations can furnish crimp-on sleeves for fine
stranded conductors which permit these conductors to be
used with box lugs.

Ampere Ratings
The ampere rating per pole for power distribution blocks is
based on the line ampacity of 75°C insulated conductors per
NEC® Table 310.15 (b)(16).* If 60°C insulated conductors
are used, load must not exceed the ampacity of 60°C
conductors. Use of conductors rated in excess of 75°C
is permitted (for example 90°C), however, load must not
exceed the ampacity of 75°C conductors.

FOR USE WITH
DISTRIBUTION/SPLICER BLOCK NO.

POLES

LD0xxx-2 / LS0xxx-2
LFD0xxx-3 / LD0xxx-3 / LS0xxx-3
LD2xxx-1 / LS2xxx-1
LD2xxx-2 / LS2xxx-2
LFD2xxx-3 / LD2xxx-3 / LFS2xxx-3 / LS2xxx-3
LD3xxx-1 / LS3xxx-1
LD3xxx-2 / LS3xxx-2
LFD3xxx-3 / LD3xxx-3 / LS3xxx-3
LD4xxx-1 / LS4xxx-1
LD4xxx-2 / LS4xxx-2
LD4xxx-3 / LS4xxx-3
LD5xxx-1 / LS5xxx-1
LD5xxx-2 / LS5xxx-2
LFD5xxx-3 / LD5xxx-3 / LS5xxx-3

2
3
1
2
3
1
2
3
1
2
3
1
2
3

Note: For installation of optional clear plastic covers, use the screws provided with each cover.

*Formerly table 210.16
littelfuse.com

122

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

POWR-BLOKS ™

1
2
3
4

AL

175

2

175

3

175

2

175

3

310

2

310

3

175
175
175
175
175
175
335
335
380
335
335
380
350
350
350
380
380
380
350
350
350
380
380
380
335
335
335
380
380
380
380
380
380
760
760
760

1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3

665

1

665

2

665

3

CONNECTOR

AL

AL

AL

AL

CU

AL

AL

AL

CU

CU

AL

AL

AL

AL

AL

AL

LOAD CONNECTION
OPENINGS
PER POLE

LUG TYPE

WIRE RANGE

FIGURE

POLES

115
115
115
115

LINE CONNECTION

CATALOG/
ORDERING
NUMBER

#2 - #14
#2 - #14
#2 - #14
#2 - #14

4
4
4
4

Slotted
Slotted
5/64" Hex
Slotted

#10 - #18
#10 - #18
#10 - #18
#10 - #18

2
2
2
2

0LD14001Z
0LD14002Z
LFD14003Z
0LD14004Z

5/16" Hex

2⁄0 - #14

6

Slotted

#4 - #14

1

0LD04012Z

1

3/16" Hex

2⁄0 - #14

6

1/8" Hex

#4 - #14

1

LFD04013Z

1

5/16" Hex

2⁄0 - #14

4

Slotted

#4 - #14

1

0LD04022Z

1

5/16" Hex

2⁄0 - #14

4

Slotted

#4 - #14

1

0LD04023Z

1

5/16" Hex

350mcm - #6

6

Slotted

#4 - #14

1

0LD04042Z

1

5/16" Hex

350mcm - #6

6

Slotted

#4 - #14

1

0LD04043Z

1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
1
1
1
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
1
1
1
1
1
1

5/16" Hex
3/16" Hex
3/16" Hex
3/16" Hex
3/16" Hex
3/16" Hex
5/16" Hex
5/16" Hex
3/8" Hex
5/16" Hex
5/16" Hex
3/8" Hex
5/16" Hex
5/16" Hex
3/16" Hex
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex

2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
400mcm - #6
400mcm - #6
500mcm - #6
400mcm - #6
400mcm - #6
500mcm - #6
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
500mcm - #4
500mcm - #4
500mcm - #4
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
500mcm - #4
500mcm - #4
500mcm - #4
400mcm - #6
400mcm - #6
400mcm - #6
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
500mcm - #4
350mcm - #6
500mcm - #4
350mcm - #6
500mcm - #4
350mcm - #6

4
4
4
4
4
4
4
4
4
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
8
8
8
12
12
12
6
6
6
8
8
8

1/8" Hex
1/8" Hex
1/8" Hex
Slotted
Slotted
Slotted
Slotted
Slotted
5/32" Hex
Slotted
Slotted
5/32" Hex
Slotted
Slotted
1/8" Hex
5/32" Hex
5/32" Hex
5/32" Hex
1/8" Hex
1/8" Hex
1/8" Hex
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
Slotted
5/32" Hex
5/16" Hex
5/16" Hex
3/16" Hex
5/16" Hex
5/16" Hex
3/16" Hex

#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#4 - #14
#4 - #14
#4 - #14
#2 - #14
#2 - #14
#2 - #14
#4 - #14
#4 - #14
#4 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
#2 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14

3
3
3
3
3
3
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
7
7
7
7
7
7
7
7
7

0LD25701Z
LFD25702Z
LFD25703Z
0LD29701Z
0LD29702Z
0LD29703Z
0LD35521Z
0LD35522Z
LFD35523Z
0LD35531Z
0LD35532Z
LFD35533Z
0LD35551Z
0LD35552Z
LFD35553Z
0LD39531Z
0LD39532Z
0LD39533Z
0LD39551Z
0LD39552Z
0LD39553Z
0LD45511Z
0LD45512Z
0LD45513Z
0LD45601Z
0LD45602Z
0LD45603Z
0LD55521Z
0LD55522Z
LFD55523Z
0LD55791Z
0LD55792Z
LFD55793Z
0LD55861Z
0LD55862Z
LFD55863Z

4

Slotted

2⁄0 - #14

7

0LD55871Z

4

Slotted

2⁄0 - #14

7

0LD55872Z

4

Slotted

2⁄0 - #14

7

0LD55873Z

OPENINGS
PER POLE

LUG TYPE

WIRE RANGE

1
1
1
1

Slotted
Slotted
5/32" Hex
Slotted

1

3/8" Hex
3/8” Hex
3/8” Hex

CONNECTOR

Note: AL = Aluminum / CU = Copper

© 2014 Littelfuse POWR-GARD® Products Catalog

123

littelfuse.com

6
Fuse Blocks and Holders

AMP
RATING
PER
POLE

CONNECTOR
MATERIAL

Distribution Block Selection Guide

Blocks and Holders

POWR-BLOKS ™

1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
Adder
1
2
3
Adder
1
2
3
Adder

CONNECTOR
MATERIAL

760
760
760
380
380
380
760
760
760
760
760
760
175
175
175
175
175
175
175
175
175
175
175
175

LINE CONNECTION
CONNECTOR

AL

AL

CU

CU

AL

AL

CU

LOAD CONNECTION

OPENINGS
PER POLE

LUG TYPE

WIRE RANGE

2
2
2
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1

3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/8" Hex
3/16" Hex
3/16" Hex
3/16" Hex
–
5/16” Hex
5/16" Hex
5/16" Hex
5/16” Hex
3/16" Hex
3/16" Hex
3/16" Hex
–

500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14

CONNECTOR

OPENINGS
PER POLE
12
12
12
8
8
8
8
8
8
12
12
12
4
4
4
4
6
6
6
6
4
4
4
4

LUG TYPE WIRE RANGE
Slotted
Slotted
1/8" Hex
5/32" Hex
5/32" Hex
5/32" Hex
3/16" Hex
3/16" Hex
3/16" Hex
Slotted
Slotted
Slotted
1/8" Hex
1/8" Hex
1/8" Hex
–
1/8” Hex
1/8” Hex
1/8” Hex
1/8” Hex
Slotted
Slotted
Slotted
–

#4 - #14
#4 - #14
#4 - #14
#2 - #14
#2 - #14
#2 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
#2 - #14
#2 - #14
#2 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14
#4 - #14

FIGURE

Fuse Blocks and Holders

6

AMP
RATING
PER
POLE

POLES

Distribution Block Selection Guide

CATALOG/
ORDERING
NUMBER

7
7
7
7
7
7
7
7
7
7
7
7
4
4
4
4
4
4
4
4
4
4
4
4

0LD55921Z
0LD55922Z
LFD55923Z
0LD55941Z
0LD55942Z
0LD55943Z
0LD59861Z
0LD59862Z
0LD59863Z
0LD59921Z
0LD59922Z
0LD59923Z
0LD25701ZXDIN
0LD25702ZXDIN
0LD25703ZXDIN
0LD2570AZXDIN
0LD25801ZXDIN
0LD25802ZXDIN
0LD25803ZXDIN
0LD2580AZXDIN
0LD29701ZXDIN
0LD29702ZXDIN
0LD29703ZXDIN
0LD2970AZXDIN

Note: AL = Aluminum / CU = Copper

Hinged Plastic Covers

littelfuse.com

Clear Plastic Covers

124

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

POWR-BLOKS ™

310

3

115
115
115
115
150
150
150
115
115
115
175
175
175
255
255
255
255
255
255
310
310
310
420
420
420
620
620
620
760
760
760
175
175
175
175
175
175
175
175

1
2
3
4
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
Adder
1
2
3
Adder

CONNECTOR

AL

AL

CU

AL

AL

AL

CU

AL

AL

AL

AL

AL

CU

LOAD CONNECTION

OPENINGS
PER POLE

LUG TYPE

WIRE RANGE

1

5/16" Hex

350mcm-#6

1

5/16" Hex

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
1
1

Slotted
Slotted
5/32" Hex
Slotted
3/16" Hex
3/16" Hex
3/16" Hex
Slotted
Slotted
Slotted
5/16" Hex
5/16" Hex
3/16" Hex
5/16" Hex
5/16" Hex
5/16" Hex
3/8" Hex
3/8" Hex
3/8" Hex
5/16" Hex
5/16" Hex
5/16" Hex
1/2" Hex
1/2" Hex
1/2" Hex
5/16" Hex
5/16" Hex
5/16" Hex
3/8" Hex
3/8" Hex
3/8" Hex
5/16" Hex
5/16" Hex
5/16" Hex
–
5/16" Hex
5/16" Hex
5/16" Hex
–

CONNECTOR

OPENINGS
LUG TYPE WIRE RANGE
PER POLE

FIGURE

2

CONNECTOR
MATERIAL

310

LINE CONNECTION

CATALOG/
ORDERING
NUMBER

1

0LS03032Z

1

5/16" Hex

350mcm-#6

350mcm-#6

1

5/16" Hex

350mcm-#6

1

0LS03033Z

#2 - #14
#2 - #14
#2 - #14
#2 - #14
1⁄0 - #18
1⁄0 - #18
1⁄0 - #18
#2 - #14
#2 - #14
#2 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
350mcm-#6
350mcm-#6
350mcm-#6
600mcm-#4
600mcm-#4
600mcm-#4
350mcm-#4
350mcm-#4
350mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14

1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
1
1

Slotted
Slotted
5/32" Hex
Slotted
3/16" Hex
3/16" Hex
3/16" Hex
Slotted
Slotted
Slotted
5/16" Hex
5/16" Hex
3/16" Hex
5/16" Hex
5/16" Hex
5/16" Hex
3/8" Hex
3/8" Hex
3/8" Hex
5/16" Hex
5/16" Hex
5/16" Hex
1/2" Hex
1/2" Hex
1/2" Hex
5/16" Hex
5/16" Hex
5/16" Hex
3/8" Hex
3/8" Hex
3/8" Hex
5/16" Hex
5/16" Hex
5/16" Hex
–
5/16" Hex
5/16" Hex
5/16" Hex
–

#2 - #14
#2 - #14
#2 - #14
#2 - #14
1⁄0 - #18
1⁄0 - #18
1⁄0 - #18
#2 - #14
#2 - #14
#2 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
250mcm-#6
350mcm-#6
350mcm-#6
350mcm-#6
600mcm-#4
600mcm-#4
600mcm-#4
350mcm-#4
350mcm-#4
350mcm-#4
500mcm-#4
500mcm-#4
500mcm-#4
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14
2⁄0 - #14

2
2
2
2
3
3
3
3
3
3
3
3
3
5
5
5
5
5
5
5
5
5
6
6
6
7
7
7
7
7
7
4
4
4
4
4
4
4
4

0LS13001Z
0LS13002Z
LFS13003Z
0LS13004Z
0LS21211Z
0LS21212Z
0LS21213Z
0LS25521Z
0LS25522Z
0LS25523Z
0LS25721Z
0LS25722Z
LFS25723Z
0LS31231Z
0LS31232Z
0LS31233Z
0LS31241Z
0LS31242Z
0LS31243Z
0LS31261Z
0LS31262Z
0LS31263Z
0LS45571Z
0LS45572Z
0LS45573Z
0LS51291Z
0LS51292Z
0LS51293Z
0LS53011Z
0LS53012Z
0LS53013Z
0LS25721ZXDIN
0LS25722ZXDIN
0LS25723ZXDIN
0LS2572AZXDIN
0LS29721ZXDIN
0LS29722ZXDIN
0LS29723ZXDIN
0LS2972AZXDIN

Note: AL = Aluminum / CU = Copper

© 2014 Littelfuse POWR-GARD® Products Catalog

125

littelfuse.com

6
Fuse Blocks and Holders

AMP
RATING
PER
POLE

POLES

Splicer Block Selection Guide

Blocks and Holders

POWR-BLOKS ™
Distribution Block and Splicer Block Outline Drawings
Dimensions Inches (mm)
Figure 1

.218 x .375"
[5.5 x 9.5]SLOT

.07"
[1.8]

.218 x .375"
[5.5 x 9.5]SLOT

.07"
[1.8]

2.90"

2.90"
[73.7]

[73.7]

1.00"

1.00"
[25.4]

3.38"
[85.8]

3.52"
[89.3]

.265 x .375"
[6.7 x 9.5] SLOT

4.13"
[104.8]

0.76”
[19]
0.38”
[9.7]

0.52”
[13]

1.93”
[49.1]

Figure 3

4.63"
[118]

4.73"
[121]

ø .201 / [5.11]
THRU

Fuse Blocks and Holders

1.40”
[35.6]

0.17”
[4.5]

2-pole

2.68”
[67.7]
1.92”
[48.4]

0.38”
[9.7]

3-pole

1.52”
[38.7]

4-pole

1.94"
[49.2]

.56"

.56"

[14]

[14]

1.62"
[42]

1.78"

[14]

[45.2]

2.88"
[73.0]

.62"
[16]

.62"
[16]

1-pole

SLOT THRU TYPE

.56"

2.25"
[57.2]

2.88"
[73.0]

R 0.11” [2.77]

2.75"
[69.9]

.63"
[16.1]

Ø .205 [5.2]
THRU

2.25"
[57.2]

2.88"
[73.0]

0.47”
[11.8]

2.04”
[51.6]
1.28”
[32.5]

2.29”
[58.1]

2.25"
[57.2]

1.00”
[25.4]

0.38”
[9.7]

1.13"
[28.6]

Figure 4

3.38"
[85.8]

3-pole

0.38”
[9.7]

1-pole

.31"
[7.9]

.265 x .375"
[6.7 x 9.5] SLOT

5.38"
[137]

2-pole

Figure 2

6

[25.4]

2-pole
1.74”
[44.2]
0.81”
[20.6]

3-pole
2.57”
[65.3]
1.63”
[41.3]
0.81”
[20.6]

0.89”
[22.6]

2.42”
[61.5]

0.47”
[11.8]

2.25”
[57.2]
3.00”
[76.2]

1-pole

littelfuse.com

0.25”
[6.4]

2-pole

3-pole

126

Adder

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

POWR-BLOKS ™
Distribution Block and Splicer Block Outline Drawings
Dimensions Inches (mm)
Figure 5

3.47”
[88.1]

1.94”
[49.3]
0.97”

0.97”
[25.0]

[25.0]

5.00”
[127.0]
0.97”

1.53”
[38.9]

[25.0]

2.61”
[66.2]

1.53”
[38.9]

3.38”
[85.7]
4.00”
[102]

n.203” THRU
v n ..406”
x.180”

1.17”
[29.7]

1.17”
[29.7]

0.31”
[7.9]

1-pole

2-pole

1.17”
[29.7]

3-pole

Figure 6
.31"

[7.9]

6.04"

4.16"

2.28"
[57.9]

[106]

.31"

1.14"
[29.0]

[7.9]

1.14"

1.88"

[29.0]

[47.8]

.31"

[7.9]

2.92

[74.0]

[153]

1.14"

1.88"

[29.0]

[47.8]

1.88"
[47.8]

6

4.13"

4.13"

[105]

4.13"

[105]

[105]

[121]

[121]

Fuse Blocks and Holders

4.75"

4.75"

4.75"

[121]

1-pole

n.20” THRU
v n .41”
x.18”

2-pole

3-pole

Figure 7
3.17"

8.54"

5.88"

[80.4]

1.58"
[40.2]

1.58"

2.69"

[40.2]

[68.2]

[217]

[149]

1.58"
[40.2]

4.75"

4.75"
[121]

.37"

[140]

.37"

.37"

[9.5]

1-pole

© 2014 Littelfuse POWR-GARD® Products Catalog

3.12"
[79.2]

5.50"

[140]

(9.5)

2.30"

[58.5]

[121]

5.50"

[140]

[68.2]

4.75"

[121]

5.50"

2.69"

[9.5]

2-pole

n.265” THRU
v n .500”
x.219”

3-pole

127

littelfuse.com

Blocks and Holders

TOUCH-SAFE POWR-BLOKS ™
Global Distribution Blocks

Features/Benefits
•	
•	
•	
•	
•	
•	

Global part meeting UL standards
Space saving design
Integrated touch-safe cover to increase safety
IP20 protection rating
Mounts to DIN rail or panels
Reliable brass connections for excellent continuity
in a smaller design

Specifications
Voltage Rating	
UL: 600 Vac/Vdc
	
IEC: 690 Vac/Vdc
Ampere Rating	
80 – 310 A
Material	Thermoplastic
Connector	
Brass: Better continuity,
	
Smaller design
Flammability Rating	
UL94 V-0
Approvals	
UL Recognized (File: E309688)
	
c-UL Recognized*
	
CE: IEC 60947-7-1
Environmental	
RoHS compliant

Description

*GDB60801Z, GDB61151Z, GDB61153Z, GDB61753Z Only

Web Resources

CATALOG/
ORDERING
NUMBER

CONNECTOR
MATERIAL

AMP RATING
PER POLE

LINE CONNECTION
OPENINGS OPENING
PER POLE DIAMETER

LOAD CONNECTION

WIRE
RANGE

TORQUE

SCREW
TYPE

ø7.0 mm

#8 – #4

13.5 in-lbs

Slotted

6

1

ø10.0 mm

#8 – #2

31 in-lbs

Hex 5 mm

6

ø7.0 mm

#14 – #4 17.5 in-lbs Slotted

•

GDB61601Z Brass

1

ø12.5 mm

#8 – 2/0

35.5 in-lbs Hex 5 mm

6

ø7.0 mm

#14 – #4 17.5 in-lbs Slotted

•

1

GDB63101Z Brass

1

ø19.0 mm

3/0 – 350
230 in-lbs Hex 8 mm
kcmil

11

2x ø9.0 mm #14 – #2 34.1 in-lbs
5x ø6.5 mm #14 – #6 19.8 in-lbs Slotted
4x ø5.3 mm #14 – #8 19.8 in-lbs

•

115

3

GDB61153Z Brass

1

ø10.0 mm

#8 – #2

175

3

GDB61753Z Brass

1

ø12.0 mm

#8 – 2/0

UL

IEC

80

80

1

GDB60801Z Brass

1

115

125

1

GDB61151Z Brass

160

160

1

310

400

115

175

31 in-lbs

OPENINGS OPENING
WIRE
PER POLE DIAMETER RANGE

TORQUE

SCREW
TYPE

DIN RAIL
MOUNT

For additional technical information, visit:
littelfuse.com/gdb

Ordering Information
POLES

Fuse Blocks and Holders

6

POWR-BLOKSTM Global Distribution Blocks add safety and
mounting versatility to our distribution block solutions. The
Global Distribution Blocks are approved to UL standards.
The Global Distribution Blocks are IP20 finger safe to reduce
the risk of contact and eliminate the need for block or panel
covers. Installation is quick and easy, all blocks can be
mounted on DIN rail or to the panel.

2x ø7.0 mm #8 – #4 13.5 in-lbs
Slotted
3x ø4.5 mm #10 – #14 7.2 in-lbs

•

Hex 4 mm

6

ø6.5 mm

#14 – #4 17.5 in-lbs Hex 3

•

35.7 in-lbs Hex 5 mm

6

ø6.5 mm

#14 – #4 17.5 in-lbs Hex 3

•

* GDB60801Z, GDB61151Z, GDB61153X, GDB61753Z Only

littelfuse.com

128

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

TOUCH-SAFE POWR-BLOKS ™
Global Distribution Blocks
Dimensions Inches (mm)
80 A
GDB60801Z

1.06
(27)

0.20
(5)

0.16
(4)

Ø 0.22
(Ø 5.5)

0.08
(2)
0.11
(2.7)

0.69
(17.5)

3x Ø 0.24
(3x Ø 6)

2.58
(65.5)

1.38
(35)

1.22
(31.1)

1.84
(46.8)

4x Ø 0.18
(4x Ø 4.5)
0.39
(10)
0.26
(6.5)

0.75
(19)

115 A
GDB61151Z
1.06
(27)

0.20
(5.0)

0.24
(6)

0.53
(13.5)

0.16
(4.0)

0.69
(17.5)

0.05
(1.3)

Ø 0.22
(Ø 5.5)

6

2.9
(74)

1.67
(42.3)
Ø 0.22
(Ø 5.5)
0.20
(5.0)
0.24
(6.0)

0.75
(19)

Fuse Blocks and Holders

1.38
(35)

1.80
(45.8)

0.39
(10)

0.26
(6.5)

160 A
GDB61601Z
0.98
(25)

0.24
(6.0)

2.0
(50)

3.62
(92)
1.4
(35)

3.16
(80.3)

0.08
(2.0)

1.38
(35)

© 2014 Littelfuse POWR-GARD® Products Catalog

129

littelfuse.com

Blocks and Holders

TOUCH-SAFE POWR-BLOKS ™
Global Distribution Blocks
Dimensions Inches (mm)
310 A
GDB63101Z
0.09
(2.3)

1.75
(44.5)
1.38
(35)

3.74
(95)

0.85
(21.5)

3.34
(84.8)

1.93
(49)

0.09
(2.2)

Fuse Blocks and Holders

6

0.69
(17.5)

0.98
(25)

115 A
GDB61153Z
0.20
(5.2)

175 A
GDB61753Z

0.43
(11.2)

2.07
(52.5)

2.28
(58)

2.80
(71)

1.50
(38)
0.20
(5.2)

2.07
(52.5)
3.14
(80)

0.54
(13.8)

1.69
(43)

littelfuse.com

130

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

IN-LINE GLASS FUSE HOLDERS
150322

Specifications
Voltage Rating	
Ampere Rating	
Fuse Type	
Fuse Clips	
Wire	
Molded Body	
Flammability Rating	
Approvals	
Environmental	
Storage Temperature	
Operating Temperature	

500 Vac, 125 Vdc
15 A
14
⁄ ” x 11⁄ 4”
Tin-plated brass
Black 18 AWG, 150˚ C Stranded
Single piece thermoplastic
UL94 V-0
UL Recognized (File: E14721)
RoHS complaint, Lead (Pb) free
-40˚ C to 80˚ C
-55˚ C to 125˚ C

Ordering Information

Description

CATALOG NUMBER

ORDERING NUMBER

STANDARD PACK

150322

01500322H

100 PIECES

Web Resources

The 150322 is a 500 Vac/125 Vdc rated inline fuse
holder ideal for applications where supplemental
protection is needed, such as lighting ballasts and
power supplies. 8-inch pre-stripped wire leads and
fuse clips come preassembled for quick installation.

For more information, visit: littelfuse.com/150322

Additional In-Line Glass Fuse Holders

Features/Benefits
•	 High voltage rating accommodates many
power applications
•	 Wire leads are pre-attached to fuse clips for
quick assembly

Heavy-Duty Bayonet
155 Series

Special Type
150 Series

In-Line Mount
32 V 3AG, SFE

In-Line Mount
32 V 3AG

In-Line Mount
250 V 2AG, 5x20mm

•	 Single piece molded body
•	 UL Recognized

Recommended Fuses

Dimensions Inches

3AG (312, 313 Series)........................................................ 33
3AB (314, 326, 505 Series)................................................ 33

Dimensions mm (inches)

© 2014 Littelfuse POWR-GARD® Products Catalog

131

littelfuse.com

6
Fuse Blocks and Holders

•	 Single piece body minimizes component count

Twist-Lock
155 Series

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS
LEB/LEX

VED

Specifications

O
PR

IM

LEC/LEY

Voltage rating	
Ampere rating	
Interrupting rating	
Approvals	
	
	
	
	
	

600 V
up to 30 A
200 kA rms symmetrical (with Class CC fuses)
LEB/LEX series UL Recognized Miscellaneous
Fuse holder per UL UL 4248 (File: E14721)
CSA Certified per C22.2, No. 39 (File: LR7316)
LEC/LEY series UL Listed Class CC Branch Circuit
Fuse holder per UL 512 (File: E14721)
CSA Certified per C22.2, No. 39 (File: LR7316)

Features/Benefits
•	 Design increases safety by individual device
disconnection for easy servicing, eliminating shock risk
•	 Increases efficiency by preventing faulted ballast from
severely damaging fixture or device
•	 Watertight seal
•	 Variety of terminations available for flexible design
•	 Insulating boots available for harsh environments

Description

6

Recommended Fuses

Recently redesigned, the Littelfuse 600 V in-line watertight
fuse holders allow maximum protection for high humidity and
corrosive environments. The fuse holders are designed to be
touch-safe and flexible for use in a variety of applications. See
the list below for the redesigned part numbers.

LEB/LEX series:
Accepts all Littelfuse Midget and Class CC series fuses
CCMR................................................................................ 27
KLDR, KLKR....................................................................... 28
BLF, BLN, FLM, FLQ, KLK, KLKD...................................... 30

Fuse Blocks and Holders

Applications

LEC/LEY series:
Accepts only Littelfuse Class CC fuses
CCMR................................................................................ 27
KLDR, KLKR....................................................................... 28

•	 Street lighting and parking lot lighting
•	 Sports lighting and various outdoor illuminated signs
•	 Boat electrical circuits, tractors/yard equipment and
general outdoor circuit protection (such as traffic
signals, alley lighting and electric wheelchairs)

Web Resources

Download CAD drawings, dimensions and other technical
information: littelfuse.com/in-line

TO
LOAD

TO
SOURCE

Look for these part numbers featuring our
improved design

ELECTRICAL TAPE

ELECTRICAL TAPE

TO
LOAD

•	 Better surface area for ergonomic comfort, improved grip
and better torque
•	 More pronounced seating – automatically seats as user
begins twisting
•	 Chamfered edges for additional installation comfort
BASE PART
NUMBER
LEB-AA
LEB-AA-S
LEB-AB
LEB-AYC-S
LEB-BB
LEB-JJ
LEB-JJ-S

littelfuse.com

132

PREVIOUS ORDERING
NUMBER
0LEB00AAX
0LEB0AASX
0LEB00ABX
0LEBAYCSX
0LEB00BBX
0LEB00JJX
0LEB0JJSX

NEW ORDERING
NUMBER
0LEB00AAXK
0LEB0AASXK
0LEB00ABXK
0LEBAYCSXK
0LEB00BBXK
0LEB00JJXK
0LEB0JJSXK

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS

Ordering Information

Insulating Boots

To order Littelfuse in-line fuse holders by part number,
refer to the charts on the next page.

•	 Molded from engineering-grade thermoplastics which
provide high resistance to corrosive environments
•	 Standard with all breakaway style fuse holders

LEB - AA - S
Littelfuse Series

Breakaway Feature

Load Side/Terminal Size

Line Side/Terminal Size

SERIES

DESCRIPTION

LEB

One-pole in-line fuse holder for Midget and Class CC fuses

LEC
LEX

One-pole in-line fuse holder for Class CC fuses
One-pole in-line fuse holder with
permanently installed solid neutral
Two-pole in-line fuse holder for Midget and Class CC fuses

LEY

Two-pole in-line fuse holder for Class CC fuses

LET

•	 For watertight protection of non-breakaway Y-pole
termination, order one WPB1 and one WPB3 boot

A & B Crimp Terminal

ORDERING NUMBER

TERMINAL TYPE

WPB1

A, B, C, D, J

WPB3

Y

Dimensions Inches
1-Pole

C & D Crimp Terminal

6
WPB1 BOOT
(OPTIONAL)

WPB1 BOOT
(OPTIONAL)

4.5"

1-Pole Breakaway
J Terminal
INSULATING BOOT
(STANDARD)

4.5"

INSULATING BOOT
(STANDARD)

5.4"
( ASSEMBLED LENGTH )

Y Terminal

10.3"
( ASSEMBLED LENGTH )

2-Pole

Recommended Crimping Tools

4.5"

The following crimping tools or equivalents may be used
on either the non-breakaway or breakaway watertight
in-line fuse holders.
TERMINAL SIZE

T&B PART NUMBER

BURNDY PART
NUMBER

A

WT161M

–

B

WT161M

MR4C

C

M5-GREY

Hypress Y34A

D

M5-BROWN

Hypress Y34A

© 2014 Littelfuse POWR-GARD® Products Catalog

9.3"
( ASSEMBLED LENGTH )

2-Pole Breakaway

4.2"
5.3"
( ASSEMBLED LENGTH )

10.3"
( ASSEMBLED LENGTH )

133

littelfuse.com

Fuse Blocks and Holders

9.3"
( ASSEMBLED LENGTH )

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS
Ordering Information (1-Pole LEB/LEC and 2-Pole LEX/LEY for Class CC and Midget Fuses)
SINGLE POLE

Fuse Blocks and Holders

6

DOUBLE POLE

LOAD TERMINAL SELECTION

NUMBER
LOAD
BREAKAWAY
TERMINAL TERMINAL OF WIRES
PART
PER
TYA PE WIRE SIZE
NUMBER
RANGE TERMINAL

LINE TERMINAL SELECTION
NUMBER
LINE
STRANDED TERMINAL TERMINAL OF WIRES
PER
WIRE SIZE
WIRE
TYPE
RANGE TERMINAL

STANDARD
PART
NUMBER

BREAKAWAY
PART
NUMBER

STANDARD
PART
NUMBER

LEB-AA
LEC-AA

LEB-AA-S
LEC-AA-S

LEX-AA
LEY-AA

LEX-AA-S
LEY-AA-S

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

Copper
Crimp

LEB-AB
LEC-AB

LEB-AB-S
LEC-AB-S

LEX-AB
LEY-AB

LEX-AB-S
LEY-AB-S

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

Copper
Crimp

LEB-AC
LEC-AC

—
—

LEX-AC
LEY-AC

—

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

LEB-AD
LEC-AD

—
—

LEX-AD
LEY-AD

—
—

Copper
Crimp

#12 to #8
#12

1
2

•
•

LEB-AJ
LEC-AJ

LEB-AJ- S
LEC-AJ-S

—

—

Copper
Crimp

#12 to #8
#12

1
2

LEB-AYC
LEC-AYC

LEB-AYC-S
LEC-AYC-S

LEX-AYC
LEY-AYC

LEX-AYC-S
LEY-AYC-S

Copper
Crimp

LEB-BA
LEC-BA

LEB-BA-S
LEC-BA-S

LEX-BA
LEY-BA

LEX-BA-S
LEY-BA-S

Copper
Crimp

LEB-BB
LEC-BB

LEB-BB-S
LEC-BB-S

LEX-BB
LEY-BB

LEX-BB-S
LEY-BB-S

Copper
Crimp

LEB-BC
LEC-BC

—
—

LEX-BC
LEY-BC

—
—

Copper
Crimp

LEB-BD
LEC-BD

—
—

LEX-BD
LEY-BD

—
—

Copper
Crimp

LEB-BJ
LEC-BJ

LEB-BJ-S
LEC-BJ-S

—
—

—
—

Copper
Crimp

LEB-BYC
LEC-BYC

LEB-BYC-S
LEC-BYC-S

LEX-BYC
LEY-BYC

LEX-BYC-S
LEY-BYC-S

Copper
Crimp

LEB-CA
LEC-CA

—
—

LEX-CA
LEY-CA

—
—

Copper
Crimp

#12 to #8
#12
#10
#6
#4
#10
#6
#4
#10
#6
#4
#10
#6
#4
#10
#6
#4
#10
#6
#4
#8
#4

LEB-CB
LEC-CB

—
—

LEX-CB
LEY-CB

—
—

Copper
Crimp

LEB-CC
LEC-CC

—
—

LEX-CC
LEY-CC

—
—

LEB-CD
LEC-CD

—
—

LEX-CD
LEY-CD

LEB-CJ
LEC-CJ

—
—

LEB-CYC
LEC-CYC

SOLID
WIRE

SOLID
WIRE

STRANDED
WIRE

Copper
Crimp

#12 to #8
#12
#10
#6
#4
#8
#4

1
2
2
1
1
2
1

•
•
•
•
—
•
—

•
•
•
•
•
•
•

•
•

Copper
Crimp

#6
#2

2
1

•
—

•
•

•
•

•
•

#12 to #8
#10 to #2

1
1

•
—

—
•

1
2
2
1
1
2
1
1
2
1
1
2
1
1
2
1
1
2
1
1
2
1

•
•
•
•
—
•
•
—
•
•
—
•
•
—
•
•
—
•
•
—
•
—

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Copper
Set-Screw
"Y" Type
Copper
Set-Screw
Copper
Crimp

#12 to #8
#10 to #2

1
1

•
—

—
•

Copper
Crimp

#12 to #8
#12
#10
#6
#4
#8
#4

1
2
2
1
1
2
1

•
•
•
•
—
•
—

•
•
•
•
•
•
•

Copper
Crimp

#6
#2

2
1

•
—

•
•

Copper
Set-Screw
"Y" Type
Copper
Set-Screw
Copper
Crimp

#12 to #8
#10 - #2

1
1

•
—

—
•

#12 to #8
#10 - #2

1
1

•
—

—
•

#8
#4

2
1

•
—

•
•

Copper
Crimp

Copper
Crimp

#8
#4

2
1

•
—

•
•

Copper
Crimp

#12 to #8
#12
#10
#6
#4
#8
#4

1
2
2
1
1
2
1

•
•
•
•
—
•
—

•
•
•
•
•
•
•

—
—

Copper
Crimp

#8
#4

2
1

•
—

•
•

Copper
Crimp

#6
#2

2
1

•
—

•
•

LEX-CJ
LEY-CJ

—
—

Copper
Crimp

#8
#4

2
1

•
—

•
•

#12 to #8
#10 - #2

1
1

•
—

•
•

—
—

LEX-CYC
LEY-CYC

—
—

Copper
Crimp

#8
#4

2
1

•
—

•
•

#12 to #8
#10 to #2

1
1

•
—

—
•

LEB-DA
LEC-DA

—
—

LEX-DA
LEY-DA

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

Copper
Set-Screw
"Y" Type
Copper
Set-Screw
Copper
Crimp

LEB-DB
LEC-DB

—
—

LEX-DB
LEY-DB

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

Copper
Crimp

LEB-DC
LEC-DC

—
—

LEX-DC
LEY-DC

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

Copper
Crimp

#12 to #8
#12
#10
#6
#4
#8
#4

1
2
2
1
1
2
1

•
•
•
•
—
•
—

—
•
•
•
•
•
•

LEB-DD
LEC-DD

—
—

LEX-DD
LEY-DD

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

Copper
Crimp

#6
#2

2
1

•
—

•
•

LEB-DJ
LEC-DJ

—
—

LEX-DJ
LEY-DJ

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

#12 to #8
#10 - #8

2
1

•
—

•
•

LEB-DYC
LEC-DYC

—
—

LEX-DYC
LEY-DYC

—
—

Copper
Crimp

#6
#2

2
1

•
—

•
•

#12 to #8
#10 to #8

1
1

•
—

—
•

LEB-JJ
LEC-JJ

LEB-JJ-S
LEC-JJ-S

LEX-JJ
LEY-JJ

LEX-JJ-S
LEY-JJ-S

Copper #12 to #8
Set-Screw #10 to #2

1
1

•
—

—
•

#12 to #8
#10 to #2

1
1

•
—

—
•

LEB-JYC
LEC-JYC

LEB-JYC-S
LEC-JYC-S

—
—

—
—

Copper #12 to #8
Set-Screw #10 to #2

1
1

•
—

—
•

Copper
Set-Screw
"Y" Type
Copper
Set-Screw
Copper
Set-Screw
"Y" Type
Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

littelfuse.com

134

Copper
Crimp

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS
Ordering Information (Solid Neutral LET Fuse Holders)
LOAD
NUMBER
TERMINAL TERMINAL OF WIRES
TYPE
WIRE SIZE
PER
RANGE TERMINAL

SOLID
WIRE

LINE
NUMBER
TERMINAL TERMINAL OF WIRES
TYPE
WIRE SIZE
PER
RANGE TERMINAL

SOLID
WIRE

STRANDED
WIRE

FUSE
TYPE

LINE TERMINAL SELECTION
STRANDED
WIRE

LOAD TERMINAL SELECTION
STANDARD BREAKAWAY
PART
PART
NUMBER
NUMBER

LET-AA-S

Solid
Neutral

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

LET-AB

LET-AB-S

Solid
Neutral

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

Copper
Crimp

#10
#6
#4

2
1
1

•
•
—

•
•
•

LET-AYC

LET-AYC-S

Solid
Neutral

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

“Y” Type
Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

LET-BA

LET-BA-S

Solid
Neutral

Copper
Crimp

#10
#6
#4

2
1
1

•
•
—

•
•
•

Copper
Crimp

#12 to #8
#12

1
2

•
•

•
•

LET-BB-S

Solid
Neutral

#10
#6
#4

2
1
1

•
•
—

•
•
•

Copper
Crimp

#10
#6
#4

2

LET-BB

1
1

•
•
—

•
•
•

LET-BYC

LET-BYC-S

Solid
Neutral

Copper
Crimp

#10
#6
#4

2
1
1

•
•
—

•
•
•

“Y” Type
Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

LET-JJ

LET-JJ-S

Solid
Neutral

Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

LET-JYC

LET-JYC-S

Solid
Neutral

Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

“Y” Type
Copper
Set-Screw

#12 to #8
#10 to #2

1
1

•
—

—
•

Copper
Crimp

Ordering Information (Terminals)
TERMINAL DESIGNATION

TERMINAL DESCRIPTION

A

Copper Crimp

B

Copper Crimp

C

Copper Crimp

D

Copper Crimp

J

Copper Set-Screw

Y (2 terminals)

“Y” Style Copper Set-Screw

© 2014 Littelfuse POWR-GARD® Products Catalog

NUMBER OF WIRES
PER TERMINAL
1
2
2
1
1
2
1
2
1
1
1
1
1

135

WIRE RANGE
#12-#8
#12
#10
#6
#4
#8
#4
#6
#2
#12-#8
#10-#2
#12-#8
#10-#2

SOLID
WIRE
•
•
•
•
—
•
—
•
—
•
—
•
—

STRANDED
WIRE
•
•
•
•
•
•
•
•
•
—
•
—
•

littelfuse.com

6
Fuse Blocks and Holders

LET-AA

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS
Two-Pole Breakaway Holder
Features/Benefits
•	 L
 EXT-YY version has a permanently installed “neutral”
slug to prevent the neutral from accidentally being fused
•	 L
 EX-YYC version allows for fusing of line-to-line loads or
other applications requiring two fuses to disconnect
under strain
•	 Fiberglass polymer body resists damage from impact
•	 F
 our “Y” type set-screw terminals accommodate a wide
range of solid and stranded Cu or Al conductors
•	 O-ring and terminal boots form watertight seal,
preventing leakage

Specifications

Description

Recommended Fuses

New Littelfuse LEXT-YY-S and LEX-YYC-S series breakaway
fuse holders meet state and federal highway commission
safety standards requiring fuse holders to readily disconnect
from power in case of a pole knockdown.

Accepts all Littelfuse Midget and Class CC series fuses
CCMR................................................................................ 27
KLDR, KLKR....................................................................... 28
BLF, BLN, FLM, FLQ, KLK, KLKD...................................... 30

The breakaway feature consists of a receptacle permanently
attached to the power line and a fuse holder with matching
terminals. If a knockdown occurs, the parts separate, leaving
the energized conductor recessed and unexposed.

Four WPB3 insulating boots come standard with the
LEXT-YY-S and LEX-YY-C-S fuse holders. Molded from
non-conductive engineering grade thermoplastic to deliver
a watertight seal in corrosive environments, they can be
trimmed to the specific conductor size insuring a snug fit.

Applications
•	
•	
•	
•	

Street lighting
Marinas
Travel trailer parks
Physically strained fuse holders applications

Web Resources
Additional technical information:
littelfuse.com/in-line

Ordering Information
ORDERING
NUMBER

FUSE
TYPE

LOAD
NUMBER OF
TERMINAL TERMINAL
SOLID
WIRES PER
TYPE
WIRE SIZE
WIRE
TERMINAL
RANGE

LEXTYYS

LEXT0YYSX

Midget
Class CC

“Y” type
Copper
Set-Screw

LEXYYCS

0LEXYYCSX

Midget
Class CC

“Y” type
Copper
Set-Screw

littelfuse.com

LINE TERMINAL SELECTION

#12 to #8

1

•

— 

#10 to #2

1

—

•

#12 to #8

1

•

—

#10 to #2

1

—

•

136

LINE
TERMINAL
WIRE SIZE
RANGE

NUMBER OF
WIRES PER
TERMINAL

SOLID
WIRE

STRANDED
WIRE

LOAD TERMINAL SELECTION
STRANDED
WIRE

Fuse Blocks and Holders

6

Part numbers	LEXT-YY-S (Solid neutral)
LEX-YYC-S
Voltage Rating	600 Vac/Vdc
Ampere Rating	30 A
Interrupting Rating	200 kA with Class CC Fuses
Y Terminals 	
Tin Plated Copper w/ set screws
Wire Size	
1 solid #12 to #8 or
	
1 stranded #10 to #2
Approvals 	
UL Recognized (File: E14721)
	
CSA Certified (File: LR7316)

“Y” type
Copper
Set-Screw

#12 to #8

1

•

—

#10 to #2

1

—

•

“Y” type
Copper
Set-Screw

#12 to #8

1

•

—

#10 to #2

1

—

•

TERMINAL
TYPE

© 2014 Littelfuse POWR-GARD® Products Catalog

Blocks and Holders

IN-LINE WATERTIGHT FUSE HOLDERS
Two-Pole Breakaway Holder
Dimensions Inches

LEX-YY-C-S

4 9/16"
( ASSEMBLED LENGTH )
5 1/8"
( ASSEMBLED LENGTH )
11 1/4"
( ASSEMBLED LENGTH )

LEXT-YY-S

6
Fuse Blocks and Holders

PERMANENT
NEUTRAL SLUG

4 9/16"
( ASSEMBLED LENGTH )
5 1/8"
( ASSEMBLED LENGTH )
11 1/4"
( ASSEMBLED LENGTH )

© 2014 Littelfuse POWR-GARD® Products Catalog

137

littelfuse.com

Section Overview
POWR-GARD’s Pre-Engineered Solutions include
custom-built electrical panels designed specifically
to meet NEC® requirements, as well as fused and
non-fused disconnect switches.

PRE-ENGINEERED SOLUTIONS
Table of Contents
LCP Fused Selective Coordination Panel...........................................138
LPS Series POWR-Switch (Shunt Trip Disconnect)..........................141

littelfuse.com

138

© 2014 Littelfuse POWR-GARD® Products Catalog

Pre-Engineered Solutions

LCP FUSED COORDINATION PANEL
Selective Coordination Panel

Features/Benefits
•	 Meets NEC® requirements
•	 Class CC and J fuse holders have built-in
open-circuit indication
•	 Fast-acting UL Listed fuses protect against short circuits
•	 Feed through/sub feed lugs and 84-circuit
configuration available
•	 Ground and neutral bars
•	 Copper bus standard

Advanced Design Options
•	
•	
•	
•	
•	
•	
•	

Description
The Littelfuse® Coordination Panel provides a simple,
time-saving solution for circuits that require selective
coordination. This UL Listed product saves time and money,
and increases safety by minimizing system downtime.

Applications
•	
•	
•	
•	

Elevators
Hospitals
Hotel and Entertainment Industry
Amusement Parks and Stadiums

Specifications
Voltage Ratings	
Main Bus Rating	
Conductor Terminals	
UL Listed 	

Code Requirements
Systems required by the NEC® to be selectively
coordinated include:

120/208, 120/240, 277/480 Vac
100 A - 400 A Standard
6 AWG - 300 kcmil
UL 67 Panel boards and UL 50 Enclosures

Web Resources
For more information, visit:
littelfuse.com/lcp

Health Care Essential Electrical Systems (NEC 517.30)
Elevators (NEC 620.62)
Emergency Systems (NEC 700.28)
Legally Required Standby Systems (NEC 701.27)
Critical Operations Power Systems (NEC 708.54)

To quickly specify the LCP panel,
visit littelfuse.com/lcp and
download the Specifier Tool.

Customizable Options (select one from each column)
NUMBER
OF
CIRCUITS

VOLTAGE

MAIN DEVICES

120/208 V 3P, 4 W 125, 225, 400 or
600 A MLO
2 - 42

NEUTRAL
PANEL
RATING MOUNTING

PANEL
DOOR

FUSE
HOLDERS

PANEL
FEED

10 A- 60 A fused
circuit breaker
100%

Surface

200%

Flush

Standard 30 A Class CC

120/240 V 1P, 3 W

Up to 600 A MCB
or Main Fuse
Pullout
277/480 V 3P, 4 W

BRANCH CIRCUIT
PROTECTION DEVICES
(1-3 POLE) †

Door-in-door 60 A Class J

60 A-200 A
fused pullouts
Sub-fed circuit breakers
>60 A
(not fused)

OPTIONAL LUGS

STANDARD
ENCLOSURE
RATING

None

NEMA 1

Sub-Fed (MLO panels)

NEMA 3R

Feed-Through

NEMA 4X

Top
Bottom

†Fuses quoted separately to meet panel specifications. Coordination for breakers >60 A depends on upstream and downstream devices. More specialized configurations are also available.
Contact factory for more information.
Note: The Littelfuse LPS and LCP products are custom designed products that fall outside standard specifications.

© 2014 Littelfuse POWR-GARD® Products Catalog

139

littelfuse.com

7
Pre-Engineered Solutions

•	
•	
•	
•	
•	

MLO, Main Circuit Breaker, or Main Fused Pullout device
Fused Class T branch circuit pullout
Spare fuse cabinet accessory (holds six spare fuses)
TVSS overvoltage protection
Any NEMA enclosure required
High amperage sub-fed branch breakers (J60A)
Unique Specifier Tool (see pg. 146) to easily identify panel 	
configurations from tens of thousands of options

Pre-Engineered Solutions

LCP FUSED COORDINATION PANEL
Selective Coordination Panel
Dimensions in mm [inches]mm (inches)
Dimensions

Inner Line

Standard Coordination
Panel Board711.2
(up to 30 circuits)
GND Bus
Dimensions in mm [inches]
152.4
[6.00]

GND Bus

[28.00]

246.06
711.2
[9.69]
[28.00]
246.06
[9.69]

152.4
[6.00]

711.2
[28.00]

Inner Line

227.01
[8.94]

227.01
[8.94]

419.1
711.2
[16.50]
[28.00]

Neutral Detail

419.1
[16.50]

Neutral Detail
(6 AWG - 300 kcmil) Cu/Al
Incoming Main Lugs

914.4
[36.00]

Cutler
Hammer
(6 AWG
- 300 kcmil) Cu/Al
GHB
(480 V)
or BAB
Incoming
Main
Lugs(208 V)
Circuit Breakers
(or
Pullouts)
Cutler
Hammer
GHB (480 V) or BAB (208 V)
Circuit Breakers
(or Pullouts)
LPSC001ID POWR-Safe
Dead front Class CC 600 VAC
Fuseholder for use with Littelfuse
CCMR,
KLKRPOWR-Safe
or KLDR Class CC fuses
LPSC001ID
orDead
POWR-Safe
LPSJ
front Class
CCholders
600 VACfor use
the
Class J fuses.
not included)
Fuseholder
for use(Fuses
with Littelfuse
CCMR, KLKR or KLDR Class CC fuses
or POWR-Safe LPSJ holders for use
the Class J fuses. (Fuses not included)

Front View with Front Removed

609.6
[24.00]
609.6
[24.00]

Front Trim
Type 1 (NEMA) Enclosure
Front Trim
Type 1 (NEMA) Enclosure

Front View with Front Removed

914.4
[36.00]

Hinged Door with
Catch and Lock
Hinged Door with
Catch and Lock

Standard Coordination Panel Board (31-42 circuits)
Dimensions in mm [inches]

152.4
[6.00]
152.4
[6.00]

Pre-Engineered Solutions

7

Dimensions in mm [inches]
GND Bus
GND Bus

711.2
[28.00]
246.06
711.2
[9.69]
[28.00]
246.06
[9.69]

Inner Line

711.2
[28.00]

Inner Line
227.01

419.1
711.2
[16.50]
[28.00]

[8.94]

227.01
[8.94]

Neutral Detail

419.1
[16.50]

(6Neutral
AWG -Detail
300 kcmil) Cu/Al
Incoming Main Lugs

1066.8
[42.00]

(6 AWG - 300 kcmil) Cu/Al
Cutler Hammer
Incoming
Main
Lugs(208 V)
GHB
(480 V)
or BAB
Circuit Breakers
(or
Pullouts)
Cutler
Hammer
GHB (480 V) or BAB (208 V)
Circuit Breakers
(or Pullouts)
LPSC001ID
POWR-Safe
Dead front Class CC 600 VAC
Fuseholder for use with Littelfuse
CCMR,
KLKRPOWR-Safe
or KLDR Class CC fuses
LPSC001ID
orDead
POWR-Safe
LPSJ
front Class
CCholders
600 VACfor use
the
Class
J
fuses.
not included)
Fuseholder for use(Fuses
with Littelfuse
CCMR, KLKR or KLDR Class CC fuses
or POWR-Safe LPSJ holders for use
the Class J fuses. (Fuses not included)

762
[30.00]
762
[30.00]

Front View with Front Removed

Front Trim
Type 1 (NEMA) Enclosure

Hinged Door with
Catch and Lock

Front View with Front Removed

Front Trim
Type 1 (NEMA) Enclosure

Hinged Door with
Catch and Lock

To quickly specify the LCP panel,
visit littelfuse.com/lcp and
download the Specifier Tool

littelfuse.com

1066.8
[42.00]

140

Note: The Littelfuse LPS and LCP products are custom
designed products that fall outside standard specifications.
Dimensions may change depending on panel components.
More specialized configurations are also available.
Contact factory for more information.

© 2014 Littelfuse POWR-GARD® Products Catalog

Pre-Engineered Solutions

LPS SERIES POWR-SWITCH
Shunt Trip Disconnect Switch

Specifications (POWR-Switch)
Supply Voltage Rating*	
208 V, 240 V, 480 V
Ampere Range	
30 A, 60 A, 100 A, 200 A, 400 A
Interrupting Rating	
200 kA
Enclosures	
NEMA 1 (standard)
	
NEMA 3R, NEMA 4, NEMA 12 (optional)
Approvals	UL Listed (File: E219511)
CSA Certified
*Contact factory for 600 V options.

Specifications (Shunt Trip)
Voltage Rating	
Max Inrush	
Max On time	
Momentary Inrush	

120 V, 60 Hz
4A
1.5 cycles
140 VA

Features/Benefits
•	 Pre-engineered single unit, which makes
procurement easier than systems with
multiple components
•	 Reduces labor costs up to 66% and total
installation costs by over 30%
•	 Optional features offer flexibility for a variety
of applications

Description

•	 Control power terminal block

The Littelfuse POWR-Switch provides a simple
and economical solution for applications that require
selective coordination and shunt trip capabilities.

•	 Cu and AI wire rated

7

•	 UL Listed package

®

•	 L
 ockable operating handle meets all code and
safety requirements (Accepts up to 3 locks)
•	 Every unit is fully tested before delivery

Options
•	 Control power transformer with fuses and blocks

Applications
•	 Elevator circuits
•	 Data processing rooms
•	 Building emergency systems

•	 Fire safety interface relay

Web Resources

•	 Isolated neutral lug

•	 Key to test switch
•	 Pilot light ”On”
•	 M
 echanical interlock auxiliary contact for hydraulic
elevators with automatic recall (5 amp 120 Vac rated)

Download technical information: littelfuse.com/lps

•	 Fire alarm voltage monitoring relay
•	 Option to bypass alarm when performing
maintenance (-AZ option)

© 2014 Littelfuse POWR-GARD® Products Catalog

141

littelfuse.com

Pre-Engineered Solutions

•	 Pre-wired control circuits lower installation time

Utilizes Class J time-delay fuses that are easily
coordinated with other system overcurrent devices.
The shunt trip capability allows the POWR-Switch
to meet the ANSI/ASME standard that requires
power to be automatically disconnected before
water is turned on by the fire safety system.

Pre-Engineered Solutions

LPS SERIES POWR-SWITCH
Shunt Trip Disconnect Switch
Ordering Information
Complete catalog numbers consist of switch catalog numbers and the desired options. See example below.

Example Catalog Number from Desired Options
LPS1	 T20	 R1	 K	 G	 N1	 B	F3	 U	 –	 AZ	 = Littelfuse Catalog Number LPS1T20R1KGN1BF3U-AZ

K

Red

R

Green

G

100 A

N1 2 NO & 2 NC

LPS1* 100 A 480 V

T48

White W

200 A

N2

400 A

N4

LPS2* 200 A

30–60 A N6 1 NO & 1 NC

OPTION
CODE

120 V

OPTION
CODE

R2

AZ OPTION
(BYPASS
FIRE
ALARM
DURING
MAINT.
TEST)
OPTIONAL

RATING

24 VDC Coil

—

OPTION
CODE

T20

T24 120 VAC Coil R1

RATING

LPS3* 30 A 208 V
LPS6* 60 A 240 V

OPTION
CODE

OPTIONAL

RATING

REQUIRED

OPTION
CODE

REQUIRED

RATING

OPTION
CODE

RATING

OPTIONAL

OPTION
CODE

OPTIONAL

RATING

OPTIONAL

OPTIONAL
ENCLOSURES

OPTION
CODE

REQUIRED

ISOLATED
NEUTRAL
LUG

FIRE ALARM
SHUNT TRIP
VOLTAGE
MONITORING
RELAY

RATING

REQUIRED

KEY TO
PILOT LIGHT
TEST SWITCH
“ON”

MECHANICAL
INTERLOCK AUX.
CONTACT FOR
HYDRAULIC
ELEVATORS W/
AUTOMATIC RECALL
(5 A ,120 VAC)

OPTION
CODE

RATING

BASE
CATALOG #

REQUIRED

CONTROL
POWER
FIRE SAFETY
TRANSFORMER
INTERFACE RELAY
STD. 100VA WITH
(3 PDT, 10 A, 120 V)
PRI & SEC FUSE
(120 V SEC.)

RATING

LITTELFUSE
SWITCH
CATALOG
NUMBER

A

1-Pole

F1

NEMA 3R

U

–

B

3-Pole

F3

NEMA 4

Y

–

NEMA 12

Z

–

AZ

–

LPS4* 400 A

–

*Part Numbers: Any voltage can be paired with any amperage. Options can be any combination but the ratings must match the option code. Not all options are required.
Contact factory for 600 V control power transformer option.

7

Note: When ordering - desired options must be listed in the order shown above. Typical options include Control Power Transformer, Fire Safety Interface Relay,
Mechanical Interlock Auxiliary Contact and Fire Alarm Voltage Monitoring Relay.

Pre-Engineered Solutions

Dimensions of Enclosure
CATALOG SERIES AMPERE RATING
LPS3

NEMA 1 DIMENSIONS

NEMA 3R DIMENSIONS NEMA 4, 12 DIMENSIONS

LUG SIZE

30

24”H x 20”W x 9”D

24”H x 20”W x 8”D

24”H x 20”W x 10”D

#14 - #8 AL or CU

LPS6

60

24”H x 20”W x 9”D

24”H x 20”W x 8”D

24”H x 20”W x 10”D

#14 - #2 AL or CU

LPS1

100

24”H x 20”W x 9”D

24”H x 20”W x 8”D

24”H x 20”W x 10”D

#8 - 1/0 AL or CU

LPS2

200

30”H x 20”W x 9”D

30”H x 24”W x 8”D

30”H x 20”W x 10”D

#6 - 250kcmil AL or CU

LPS4

400

48”H x 36”W x 11”D

Contact Factory

Contact Factory

3/0 AL or CU

Note: Over-size enclosures used to accommodate control power transformer, interface relay and terminal blocks.

XPress-Ship™
US Only
Littelfuse XPress-Ship™ service offers 48 Hours* direct shipment
service on our fully loaded POWR-SWITCH to meet your urgent
system requirement ON-Time.
Xpress-Ship™ switches include three JTD_ID Series
fuses rated at the device’s maximum ampacity.

AMPERE
RATING

VOLTAGE
RATING

CATALOG NUMBER

XPress-Ship™
ORDERING NUMBER

60 A

480 V

LPS6T48R1KGN6BF3-AZ

XPS6T48R1KGN6BF3-AZ

100 A

480 V

LPS1T48R1KGN1BF3-AZ

XPS1T48R1KGN1BF3-AZ

100 A

480 V

LPS1T48R1KGN1BF3

XPS1T48R1KGN1BF3

200 A

208 V

LPS2T20R1KGN2BF3-AZ

XPS2T20R1KGN2BF3-AZ

200 A

480 V

LPS2T48R1KGN2BF3

XPS2T48R1KGN2BF3

*48 Hours Xpress Shipment requires ordering from identified XPS Series Catalog Numbers shown, subject to maximum of three switches per catalog number per customer order.
Xpress-Ship™ service offers 48 Hours shipment from factory through standard ground transportation, for expedited delivery contact your local Littelfuse Representative.

littelfuse.com

142

© 2014 Littelfuse POWR-GARD® Products Catalog

Section Overview
Our comprehensive line of single- and multi-function protection
relays safeguard equipment and personnel in order to prevent
expensive damage, downtime or injury due to electrical faults.
The features and flexibility within the products and the software
allow you to select the appropriate protection for each part of
your electrical system.

PROTECTION RELAYS AND CONTROLS
Table of Contents
Feature Comparisons................................................................. 143
Ground-Fault Protection............................................................. 146
Trailing Cable Protection............................................................. 148
Resistance Grounding and NGR Monitoring...............................151
Motor Protection........................................................................ 154
Pump and Feeder Protection..................................................... 156
Arc-Flash Protection....................................................................157

Download our Complete
Relay and Controls Catalog

Industrial GFCI (Shock-Block ™)...................................................157

For more information on relays and
controls or to download our fullline relay catalog (PF130N), Visit:

Generator Control....................................................................... 163

littelfuse.com/RelaysControls

Engine Control and Diagnostics................................................. 167

Generator and Single-Function Protection................................. 158

Alarm Monitoring....................................................................... 168
Custom-Engineered Electrical Equipment..................................170
Accessories.................................................................................171

© 2014 Littelfuse POWR-GARD® Products Catalog

143

littelfuse.com

A Full Range of PROTECTION RELAYS &
Why are Protection Relays Necessary?
Protection relays safeguard critical components of an electrical circuit from
damage. When the relay detects a potentially damaging or unsafe condition,
the relay will send an alarm or trip signal in order to notify personnel or
prevent the condition from continuing.
Protection relays increase the uptime of critical systems and enhance the
safety of people and equipment during fault situations.

We Improve Electrical Safety and Increase Uptime
For decades, Littelfuse has been helping customers improve their electrical systems. In
addition to well-designed products, our technical expertise brings years of experience and
product design support to your application.
We can provide immediate access to specialized technical resources, online references or
field application support. This catalog outlines the Littelfuse line of protection relays,
custom-engineered electrical equipment, generator and engine controls, and alarm and
annunciator systems, plus the technical capabilities we offer for your application.

For All Harsh Environments
Petrochemical, Oil and Gas

Safety

Cost

Downtime

Pipelines and Transportation
Aggregate and Cement

Shock Hazard

Fault Damage

Replacement Time

Mining

Injury to Personnel

Equipment Replacement

Nuisance Tripping

Pulp and Paper

Arc-Flash Hazards

Calibration Costs

Intermittent Faults

Water and Waste Water

Open-CT Hazards

Compliance Citations

Unreliable Protection

Failed Resistors

Motor Rewinds

Calibration Time

Shore-to-Ship Power
Marine
Data Centers
Semiconductor Equipment
Hospitals
Alternative Energy
Power Generators

CONTROLS for the Harshest Environments
GENERATOR PROTECTION & CONTROL

ENGINE CONTROL & MONITORING

Our line of generator protection and control equipment
offers synchronizing, frequency control, load sharing, power
management, engine control and more for marine, emergency
or power generation applications.

These monitors can be configured from the front panel, a PC, or via an
SD card, and support both digital and analog sensor inputs. Common
alarms and shut-downs have large, user-friendly LED displays.

ARC-FLASH DETECTION
Our Arc-Flash relays can rapidly detect developing
Arc-Flash incidents and send a trip signal to interrupt
power before significant damage occurs.

GROUND-FAULT PROTECTION RELAYS
Improve the safety of workers and reduce incidents of Arc-Flash without
affecting the uptime of critical operations. Sensitive ground-fault relays
with advanced filtering will detect the breakdown in insulation resistance
caused by moisture, vibration, chemicals and dust without nuisance trips.

FEEDER PROTECTION RELAYS
Protect feeder circuits from overcurrents, ground faults, phase
loss or other detrimental conditions in critical applications and
processes. They provide essential data for predictive and preventive
maintenance— extending the life of equipment, enhancing safety and
maximizing efficiency.

MOTOR & PUMP PROTECTION RELAYS
Prevent expensive damage to motors caused by overloads,
jams, phase loss or unbalance, heat from non-electric
sources, heavy start-ups or excessive operational cycles.
Dynamic thermal curves, integrated protection, metering,
and data-logging functions extend motor life and maximize
process efficiency.

00

GENERAL PROTECTION RELAYS
These single-function, compact and cost-efficient relays are typically used
on low-voltage applications. Most are DIN-rail mountable, easy to operate,
install and commission. The wide-range power supply for AC and DC make
these relays universal.

RESISTANCE GROUNDING & MONITORING

ENGINE DIAGNOSTICS

Overcome many of the issues experienced with
solidly-grounded and ungrounded systems.
High-Resistance Grounding eliminates Arc-Flash
Hazards associated with ground faults and
transient overvoltages, and allows for
continuous operation during a ground fault.

The EngineEye diagnostic unit can improve the efficiency and
performance of combustion engines by measuring and analyzing the
engine combustion process. It utilizes a unique handheld high-precision
indicator of cylinder pressure.

ALARM & ANNUNCIATOR PANELS
These panels monitor instantaneous current, temperature or pressure,
and include local indication, alarm and event logging.

Protection Relays & Controls

FEATURES COMPARISONS
Arc-Flash Relays

Ground-Fault Protection Relays

‡

USB
DC supply
AC supply
Data logging

a

10

No. of inputs
Digital input
No. of open collector outputs
Siren output

a a

LCD display
Configure from PC
Configure from DIP switches/
jumper
Configure from front panel

a
a
a
a a
a
a
a
a
a

M4780

a a a
a a a a a a a

Indicator panel

Common alarm output†

a a

M4700

Alarm panel

M4600

a

a
a
a
a
a

M4500

a
a
a
a
a
a

M4200

a
a
a
a

FEATURE

M3000

Protection Relays & Controls

Cable monitoring
on sensor inputs

M1000

a a a
a a a
a a
a a

Fiber optic sensors

Alarm Monitors

FPS

a

FPU-32

a a

a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a

PGR-6800

a
a
a
a
a
a
a
a
a
a
a
a
a
a

a
a a
a
a
a
a a
a
a

a
a a a aa a

‡

MPS

‡

a
a
a
a
a
a
a
a
a
a

Current detection
Point sensors

a
a
a
a
a
a

PGR-8800

a

FEATURE

D0100

‡

MPU-32

a

a
a
a
a
a

SE-330
SE-330HV
SE-330AU

a a a a aa
a
a a a a aa
a a a
a a aa
aa
a
a a
a a aa
a
a
a a aa
a
a a
aaa
a a a
a

PGR-6150

a

PGR-6130

littelfuse.com

PGR-6100

8

Ground fault (50G/N, 51G/N)
Overload (49, 51)
Unbalance (current) (46)
Phase loss (current) (46)
Phase reverse (current) (46)
PTC overtemperature (49)
Undercurrent (37)
Jam
Overcurrent (50, 51)
Failure to accelerate
RTD temperature (38, 49)
Starts per hour (66)
Differential (87)
Reduced overcurrent setting
Phase loss (voltage) (47)
Phase reverse (voltage) (47)
Unbalance (voltage) (47)
Overvoltage (59)
Undervoltage (27)
Power factor (55)
Overfrequency (81)
Underfrequency (81)
Starter control
Breaker control
Underspeed (14)
Integrated CTs
Off-line insulation monitoring
Metering and data logging
Communications
Conformal coating
10-year warranty

SE-325

a
a a
a a a a a aa a

Motor & Feeder Protection Relays
FEATURE (IEEE #)

SE-145

SE-134C
SE-135

SE-105
SE-107

T2800

a
a
a a

SE-701
SE-703
SE-704

a a

SE-502

T3200

‡

a
a
a
a
a
a
a
a
a

PGR-3200

a
a
a
a
a
a
a

EL3100

Detects GF via voltage
Detects GF via current
Detects DC GF
Adjustable GF pickup
Adjustable time delay
Remote reset
Analog output
Fail-safe option
Harmonic filtering
CT-Loop monitoring
Insulation monitoring
Ground-check monitoring
Grounding-resistor monitoring
PTC/RTD overtemperature
Communications
Conformal coating

EL731

SE-601

FEATURE

MODBUS-RTU (RS485)
LED dimming
LED synchronizing
Panel linking 	
Remote reset	
Sensor monitoring
Insulation monitoring of
supply voltage
Monitoring of supply voltage

24

8

6

8

20

20

a a* a a a a a

10 14 4
1oc 1oc 2dryc
1dryc 1oc 1dryc

a
a a a
a
a
a
a a
a a a
a
a
a
a a a
a a a
a
a
a
a

1dryc‡ 1dryc‡
1dryc‡ 1dryc‡

a a

*Both analog and digital input.
†oc=open collector; dryc=dry contact
‡Optional

a
a
a
a
a

a
a
a
a
146

NOTE:
Tables are for reference only and include standard and optional configurations.
Please see the respective catalog page for exact product specifications.
IEEE Device Numbers are shown in parenthesis after the applicable features.

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

FEATURES COMPARISONS
00

Engine Controls

Generator Protection & Single-Function Relays

a
a
a

aa
aa

aa

a

aa

a aa
aaaa a
a
aaaaaaaaaa

Engine Diagnostics

a

a
a

a

a

a

a

a
a
a
a
a
a
a
a
a
a
a

a

a

NOTE: These tables are for reference only and include standard and optional configurations.

© 2014 Littelfuse POWR-GARD® Products Catalog

a

FEATURES

USB
Color LCD
PC software included
Upgradable

a
a
a
a

Temperature compensation
Calibration-check
integration
Connecting sensor ports
Pressure graph

BASIC ADVANCED PROFESSIONAL
E5000
E5000,
E5000, E5100,
& E5100
E5100
E5200 & 5300
& E5200

a
a
a
a
a
a

a
a
a
a
a
a

a
a
a
a
a
a

1

2

5

a

a

a
a
a
a
a
a
a
a
a
a
a

*

MIP mode

a
a
a
a
a
a

Misfire analysis
pmax
p/time

a

pmax bar graph

a
a
a
aaa

a
a
a
a

p/alpha

*

dp/alpha

*

p/V

*

Pressure sensor

a

a

Crank-angle sensor

Maximum engines
(memory)
Maximum cylinders/
engine (memory)

5

10

20

20

20

20

Maximum number of
strokes (memory)

30

30

30

*Possible with a crank angle sensor E5300.

147

littelfuse.com

8
Protection Relays & Controls

a

a

a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a

S6610

a

S6100

a

S6000

a

C6200

T8400

aaaaa

M8100

T7900

E7800

T5000

T4900

T4800

T4500

T2600

3 phase true RMS measurement
Overcurrent
Short circuit
Overload
Reverse power (32)
Excitation loss (40)
Overfrequency (81)
Underfrequency (81)
Overvoltage (59)
Undervoltage (27)
ROCOF (81)
Vector shift
Preferential load trip
Synchronizing (25)
Check synchronizer (25)
Active load sharing [kW]
Reactive load sharing [kVAR]
Power factor regulation
Dead bus monitoring/
black out limiter
Load depending start/stop
(PM)
Large consumer control (PM)
Dynamic grid-parallel
operation control
MODBUS RTU
(RS485 interface)
Motorized potentiometer
Electronic potentiometer
Dead bus closure

a a
a a a
a
a a
a
a
a
a
a a a

a

Generator Controls
FEATURE (IEEE #)

Start/stop
Digital sensor inputs
Analog sensor inputs
Cable monitoring on fuel/
stop solenoid output
Graphical display
CAN J1939
USB
SD card slot
Pick-up input

M2600

a

M2500

a

FEATURE (IEEE #)

M2000

T3300

T3100

a
a

T3000

a

a

T2900

a
a

aa

T2700

a

T2500

a

T2400

T2300

T2200

T2100

T2000

G3300

G3000

Overload
Overcurrent
Undercurrent (37)
Short circuit
Reverse power (32)
Overfrequency (81)
Underfrequency (81)
Overvoltage (59)
Undervoltage (27)
Excitation loss (40)
Earth fault
Differential current relay (87)
Insulation monitoring relay
Single phase measurement
3-phase measurement
Conformal coating

G2000

PGR-4300

FEATURE (IEEE #)

Protection Relays & Controls

GROUND-FAULT PROTECTION
SE-601 (PGR-2601) DC Ground-Fault Relay
For Ungrounded DC Systems
Features/Benefits

Specifications

•	 Sensitive 1- to 20-mA trip settings

IEEE Device Number 	
Dimensions 	
	
	
Communications	
Warranty 	

•	 A microprocessor-based ground-fault relay
for ungrounded dc systems
•	 50-ms to 2.5-s time-delay settings
•	 Limits ground-fault current to 25 mA
•	 Form-A and Form-B trip contacts

76G
H 75 mm (3.0”)
W 55 mm (2.2”)
D 115 mm (4.5”)
Analog Output
5 Year

Web Resources
littelfuse.com/se-601

ORDERING NUMBER
SE-601-OD
SE-601-OT
SE-601-OU

SPECIFICATIONS
24 Vdc Control Power
48 Vdc Control Power
120/240 Vac/dc 50/60 Hz Control Power

ACCESSORIES
SE-GRM Series Ground Reference Modules
PGA-0500 Analog Current Meter

EL3100 Ground-Fault & Phase-Voltage Indicator
For Grounded/Ungrounded AC Systems
Features/Benefits

Specifications

•	 Meets National Electrical Code (NEC®)
Article 250.21 and Canadian Electrical
Code Part 1, Section 10-106 (2)
requirements for ungrounded systems
•	 System voltage is not present at the
remote LED locations
•	 Indicates the presence of voltage on both
grounded and ungrounded systems

Input Voltage	
Input L: 208/240 Vac
	
Input H: 480/600 Vac
Dimensions	H 87.0 mm (3.43”)
W 112.5 mm (4.43”)
D 56.0 mm (2.2”)
Approvals	
CSA certified,
	
UL Listed (E340889)
5 years
Warranty	

Web Resources
littelfuse.com/el3100

ORDERING NUMBER
EL3100-00

Protection Relays & Controls

8

MOUNTING
DIN, Surface

ACCESSORIES
RK-310X-0Y (optional)

PGR-3200 Ground-Fault Protection System
For Ungrounded AC Systems

Features/Benefits

Specifications

•	 Meets NEC Article 250.21 (B)
•	 Continuously monitors the insulation
integrity of ungrounded electrical systems
for ground faults
•	 Provides 2 warnings and 1 alarm
•	 Analog output for insulation reading

IEEE Device Number	
Dimensions 	
	
	
Communications	
Warranty 	

27, 64
H 99.7 mm (3.9”)
W 75 mm (4.3”)
D 110 mm (4.3”)
Analog Output
5 Year

Web Resources
littelfuse.com/pgr-3200

littelfuse.com

ORDERING NUMBER

SPECIFICATIONS

PGR-3200

240 Vac Control Power

148

ACCESSORIES
PGH family High Tension Couplers
PGA-0510 Analog Insulation Meter

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

GROUND-FAULT PROTECTION
SE-701 (PGR-5701) Ground-Fault Relay
For Solidly and Resistance-Grounded Systems
Features/Benefits

Specifications

•	 Choice of input CT gives wide setting range
•	 A microprocessor-based ground-fault relay for
resistance-grounded and solidly
grounded systems
•	 Microprocessor-based unit with DFT
•	 Non-volatile trip memory retains trip state
•	 Compatible with VFD applications
•	 Adjustable pick-up settings from 1% to 99%
of CT primary rating, as low as 50 mA
•	 Adjustable time-delay settings from
0.5 to 2.5 sec

IEEE Device Numbers 	
Dimensions 	
	
	
Communications	
Warranty 	

ORDERING NUMBER
SE-701-OU
SE-701-OD
SE-701-OT
SE-701-O3

SPECIFICATIONS
120/240 Vac/dc Control Power
12/24 Vdc Control Power
48 Vdc Control Power
24 Vac Control Power

50G/N, 51G/N
H 75 mm (3.0”)
W 55 mm (2.2”)
D 115 mm (4.5”)
Analog Output
5 Year

Web Resources
littelfuse.com/se-701
ACCESSORIES
Ground Fault Current Transformers
PGA-0500 Analog Current Meter

SE-703 Earth Leakage Monitor

For Solidly and Resistance-Grounded Systems
Features/Benefits

Specifications

•	 Provides sensitive ground-fault protection
•	 A microprocessor-based ground-fault relay
for resistance-grounded and solidly earthed
systems
•	 Microprocessor-based unit with DFT
•	 Non-volatile trip memory retains trip state
•	 Compatible with VFD applications
•	 Adjustable pick-up settings from
25 mA to 500 mA
•	 Adjustable time-delay settings from
50 to 500 ms
ORDERING NUMBER
SE-703-OU
SE-703-OD
SE-703-OT
SE-703-O3

SPECIFICATIONS
120/240 Vac/dc Control Power
12/24 Vdc Control Power
48 Vdc Control Power
24 Vac Control Power

IEEE Device Numbers 	
Dimensions 	
	
	
Communications	
Warranty 	

50G/N, 51G/N
H 75 mm (3.0”)
W 55 mm (2.2”)
D 115 mm (4.5”)
Analog Output
5 Year

Web Resources
littelfuse.com/se-703

ACCESSORIES
EFCT series Current Transformers
PGA-0500 Analog Current Meter

8

Features/Benefits

Specifications

•	 Provides very sensitive groundfault protection
•	 Microprocessor-based unit with DFT
•	 Non-volatile trip memory retains trip state
•	 Compatible with VFD applications
•	 Adjustable pick-up settings from
10 mA to 5 A
•	 Adjustable time-delay settings from
•	 0.5 to 2.5 sec

IEEE Device Numbers 	
Dimensions 	
	
	
Communications	
Warranty 	

ORDERING NUMBER
SE-704-OU
SE-704-OD
SE-704-OT
SE-704-O3
© 2014 Littelfuse POWR-GARD® Products Catalog

SPECIFICATIONS
120/240 Vac/dc Control Power
12/24 Vdc Control Power
48 Vdc Control Power
24 Vac Control Power

149

50G/N, 51G/N
H 75 mm (3.0”)
W 55 mm (2.2”)
D 115 mm (4.5”)
Analog Output
5 Year

Web Resources
littelfuse.com/se-704

ACCESSORIES
SE-CS30 series Current Transformers
PGA-0500 Analog Current Meter

littelfuse.com

Protection Relays & Controls

SE-704 (PGR-4704) Earth Leakage Monitor
For Solidly and Resistance-Grounded Systems

Protection Relays & Controls

GROUND-FAULT PROTECTION
T2800 Earth-Fault Relay
For Solidly and Resistance-Grounded Systems
Features/Benefits

Specifications

•	 Accepts high supply voltage variation

Trip Level	
Delay	
Dimensions 	
	
	

•	 Visual indication of power, pick-up and
output trip
•	 Direct line-line or line-neutral voltage supply
•	 Wide range of combined current and delay
settings

Web Resources
littelfuse.com/t2800

•	 DIN-rail or Screw-mount
ORDERING NUMBER

TERMINALS
2-3

1-3
230 V
450 V
127 V
24V DC+AC
480 V
230 V

T2800-00
T2800-01
T2800-02
T2800-04
T2800-05
T2800-08

0.02-0.2 x IN or 0.2-2 x IN
0.1-1 sec or 1-10 sec
H 70 mm (2.76”)
W 100 mm (3.94”)
D 115 mm (4.52”)

400 V
120 V
415 V

IN
5A
5A
5A
5A
5A
1A

EL731 AC/DC Sensitive Earth-Leakage
For Solidly-Grounded Systems
Features/Benefits

Specifications

•	 Microprocessor based relay that offers
complete coverage for all frequencies

IEEE Device Numbers 	

•	 Adjustable trip settings provide wide range
protection and coordination

Dimensions	H 48 mm (1.9”)
		
W 96 mm (3.8”)
		
D 129 mm (5.0”)
Warranty 	
5 Years

		

•	 Operate in both AC or DC mode and single
or combined ranges

Web Resources

•	 LED indication for visual trip, alarm and CT

Protection Relays & Controls

8

ORDERING NUMBER
EL731-00-XO
EL731-01-XO
EL731-02-XO
EL731-03-XO
EL731-04-XO
EL731-10-XO
EL731-11-XO
EL731-12-XO
EL731-13-XO
EL731-14-XO

CONTROL POWER
120/240 Vac/Vdc
120/240 Vac/Vdc
120/240 Vac/Vdc
120/240 Vac/Vdc
120/240 Vac/Vdc
48 Vdc & 24 Vac
48 Vdc & 24 Vac
48 Vdc & 24 Vac
48 Vdc & 24 Vac
48 Vdc & 24 Vac

COMMUNICATIONS
None
DeviceNet™
Profibus®
Ethernet/IP™
Modbus®TCP
None
DeviceNet™
Profibus®
Ethernet/IP™
Modbus®TCP

38, 49, 50G/N,
51G/N, 79G

littelfuse.com/el731

ORDERING NUMBER
EL731-20-XO
EL731-21-XO
EL731-22-XO
EL731-23-XO
EL731-24-XO

CONTROL POWER
24 Vdc
24 Vdc
24 Vdc
24 Vdc
24 Vdc

COMMUNICATIONS
None
DeviceNet™
Profibus®
Ethernet/IP™
Modbus®TCP

T3200 Double Insulation Monitoring Relay
For Ungrounded Systems
Features/Benefits

Specifications

•	 Continuously monitors two systems
galvanically separated from each other
•	 Ensures correct operation in spite of
voltage supply fluctuations
•	 Visual indication of power pick-up, and
output trip

Insulation Level	
Max Voltage	
Dimensions 	
	
	

0-5 MW
660 V
H 70 mm (2.75”)
W 100 mm (3.94”)
D 115 mm (4.52”)

Web Resources
littelfuse.com/t3200

ORDERING NUMBER
T3200.0010
T3200.0020
T3200.0030
T3200.0050
T3200.0060
littelfuse.com

1-3 TERMINALS
230 V
450 V
480 V
110 V
127 V

150

2-3 TERMINALS
400 V
415 V
100 V
120 V

ACCESSORIES

E2333 Megaohmmeter

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

TRAILING CABLE PROTECTION
SE-105 • SE-107 Ground-Fault Ground-Check Monitor

Features/Benefits

Specifications

•	 Adjustable pickup so unit can be used on a
wide variety of trailing cable applications

IEEE Device Numbers	
Dimensions	
	
	
Warranty	

•	 Adjustable time delay for quick protection
and system coordination
•	 Harmonic filter prevents false operation

3GC, 50G/N, 51G/N
H 150 mm (5.9”)
W 109 mm (4.3”)
D 100 mm (4.0”)
5 Years

Web Resources
littelfuse.com/se-105
littelfuse.com/se-107

ORDERING NUMBER

CONTROL POWER

ACCESSORIES

SE-105
SE-105D
SE-105E
SE-107
SE-107D
SE-107E

120 Vac
120 Vac/Vdc
240 Vac
120 Vac
120 Vac/Vdc
240 Vac

CT200 Series Current Transformer
1N5339B Termination Assembly
SE-TA6 Termination Assembly
SE-TA6-SM Stud-Mount Termination Assembly

SE-134C (PGM-8134C) • SE-135 Ground-Fault Ground-Check Monitor
Features/Benefits

Specifications

•	 Fail-safe ground check circuit

IEEE Device Numbers 	
Dimensions 	
	
	
Warranty 	

•	 Combination ground-wire monitor and
ground-fault relay
•	 Zener-characteristic termination device
•	 High-induced-ac rejection

Web Resources

•	 DFT (harmonic) filter

ORDERING NUMBER

3GC, 50G, 50N, 51G, 51N
H 213 mm (8.4”)
W 99 mm (3.9”)
D 145 mm (5.7”)
5 Year

littelfuse.com/se-134c
littelfuse.com/se-135

OPTION

SE-134C

Blank or XGC

SE-135

Blank or XGC

POWER SUPPLY
0= 120/240 Vac/Vdc
1=24/48 Vdc
0= 120/240 Vac/Vdc
1=24/48 Vdc

COMM
0=None

8

0=None
3=Ethernet

Features/Benefits

Specifications

•	 Adjustable pick can be used on a wide variety
of trailing cable applications

IEEE Device Number	
Dimensions 	
		
		
Communications	
Warranty 	

•	 Adjustable time delay for quick protection and
system coordination
•	 Separate annunciations of ground-fault and
ground-check faults

3GC, 50G, 50N, 51G, 51N
H 213 mm (8.4”)
W 192 mm (7.6”)
D 176 mm (7.0”)
Ethernet Optional
5 Year

Web Resources
littelfuse.com/se-145

© 2014 Littelfuse POWR-GARD® Products Catalog

ORDERING NUMBER

CONTROL POWER

COMM

SE-145-00-00
SE-145-03-00
SE-145-30-00
SE-145-33-10

120/240 Vac; 110-250 Vdc
120/240 Vac; 110-250 Vdc
24 Vdc Battery Back-up
24 Vdc Battery Back-up

—
Modbus®TCP
—
Modbus®TCP

151

littelfuse.com

Protection Relays & Controls

SE-145 Ground-Fault Ground-Check Monitor

Protection Relays & Controls

RESISTANCE GROUNDING AND NGR MONITORING
SE-325 (PGM-8325) Neutral-Grounding-Resistor Monitor
Description

Specifications

The SE-325 Neutral-Grounding-Resistor Monitor
is used on resistance-grounded systems up to
25 kVac to monitor the integrity of the neutral-toground path for loose connection, corrosion, and
ground faults.

IEEE Device Numbers 	
50G/N, 51G/N,
	
59N, 86, 3
Dimensions 	H 150 mm (5.9”)
W 109 mm (4.3”)
D 100 mm (4.0”)
Warranty 	
5 Year

Features/Benefits
•	 Adjustable ground-fault detection

Web Resources

•	 Adjustable time-delay settings

littelfuse.com/se-325

•	 Selectable fail-safe mode
•	 Conformally coated circuit boards

ORDERING NUMBER
SE-325
SE-325D
SE-325E

SPECIFICATIONS
120 Vac
120 Vdc
240 Vac

ACCESSORIES
CT200 Series Current Transformers
ER Series Sensing Resistors

SE-330AU Neutral-Grounding-Resistor Monitor
Description

Specifications

An advanced ground-fault and ground-resistor
monitoring relay for low and medium-voltage
transformers and generators. The SE-330AU
complies with AS/NZS 2081.3:2002.

Dimensions 	H 213 mm (8.4”)
W 98 mm (3.9”)
D 132 mm (5.2”)
Communications	
RS-232; DeviceNet™,
	Profibus ®, Ethernet
Warranty 	
5 Year

Features/Benefits
•	 Continuous NGR monitoring

Web Resources

•	 Detect ground-fault anywhere on
monitored system

littelfuse.com/se-330au

•	 Adjustable pickup settings
•	 Adjustable time delay settings

ORDERING NUMBER
SE-330AU-00-OX
SE-330AU-01-OX
SE-330AU-02-OX
SE-330AU-03-OX

COMM
RS-232
RS-232 & DeviceNet™
RS-232 & Profibus®
RS-232 & Ethernet/IP™ & Modbus®TCP

SE-330 (PGR-5330), SE-330HV Neutral-Grounding-Resistor Monitor
Description

Protection Relays & Controls

8

CONTROL POWER
120/240 Vac/Vdc
120/240 Vac/Vdc
120/240 Vac/Vdc
120/240 Vac/Vdc

Specifications

IEEE Device Numbers 	

Advanced ground-fault and grounding-resistor
monitoring relay. It measures neutral current,
neutral-to-ground voltage and neutral-to-ground
resistance.

Features/Benefits
•	
•	
•	
•	

SE-330

SE-330 for all
app. 35 kV
or less
SE-330HV for
72 kV apps.

littelfuse.com

Web Resources

Continuous NGR monitoring
Detect ground-fault on monitored system
Adjustable pickup (2-100%)
Adjustable time delay (0.1 - 10s)

ORDERING
NUMBER

POWER SUPPLY
-

X

littelfuse.com/se-330

COMM

CERTIFICATION
X

-

0=USB only
1= DeviceNet
3=Ethernet (Dual RJ45)
0=120/240 Vac/Vdc 4=Ethernet (SC fiber & RJ45)
5=Ethernet (Dual SC Fiber)
2=48 Vdc
6=IEC61850 (Dual RJ45)
7=IEC61850 (SC Fiber & RJ45)
8=IEC61850 (Dual SC Fiber)

152

50G/N, 51G/N, 59N, 3, 86

Dimensions 	H 213 mm (8.4”)
W 98 mm (3.9”)
D 132 mm (5.2”)
Warranty 	
5 Year

X

0=CSA, UL
1=CSA, UL,
CE, C-Tick

K4 UNIT HEALTHY
CONTACT
X

0=Normally
Open
1=Normally
Closed

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

RESISTANCE GROUNDING AND NGR MONITORING
SE-502 Ground-Fault Ground-Continuity Detector
Description

Specifications

Provides Class-A GFCI trip level and trip times for
personnel protection.

IEEE Device Numbers 	

Features/Benefits
•	 Sensitive ground-fault detection
•	 Internal neutral-grounding resistor eliminates
arc-flash hazards

64, 86, 95

Dimensions 	H 75 mm (3.0”)
W 100 mm (4.0”)
D 113 mm (4.4”)
Warranty 	
5 Year

Web Resources

littelfuse.com/se-502

•	 Neutral-to-ground connection monitoring can
detect a hazardous ungrounded condition

ORDERING NUMBER

CONTROL POWER

SE-502-01

120 Vac

NGR Series (PGN-1000)

Low-Resistance Grounding System
Low-Resistance grounding is typically applied
on transformers and generators, and limits the
ground-fault current to 25 A and above. Since
ground-fault current is above 25 A, the faulted
feeder must be de-energized. The reduced
ground-fault current allows for an orderly shutdown procedure, typically within 10 seconds.

Web Resources

CT
NGR

SE-330 or
SE-325

SENSING
RESISTOR

For more information on Resistance Grounding
Systems, visit littelfuse.com/pgn-1000

L1
L2

8
PGN-3000

High-Resistance grounding is typically applied
on transformers and generators, and limits
the ground-fault current to 10 A or less. Since
ground-fault current is below 10 A, the faulted
feeder can remain in operation. The reduced
ground-fault current allows for an orderly shutdown procedure.

Web Resources
For more information on Resistance Grounding
Systems, visit littelfuse.com/pgn-3000

© 2014 Littelfuse POWR-GARD® Products Catalog

153

TRANSFORMER
SECONDARY
(Delta-connected
or wye-connected
with inaccessible
neutral)

ZIGZAG
TRANSFORMER

(Included with
PGN Series if necessary)

CT

NGR

SENSING
RESISTOR

SE-330 or
SE-325

L1
L2

littelfuse.com

Protection Relays & Controls

High-Resistance Grounding System

Protection Relays & Controls

MOTOR PROTECTION
PGR-6100 (GFR-4000) Motor Ground-Fault and Insulation Relay
Features/Benefits

Specifications

•	 Online monitoring to detect ground faults

IEEE Device Numbers 	
Dimensions 	
	
	
Communications	
Warranty 	

•	 Offline monitoring of insulation resistance
•	 Continuously monitors for predictive
protective capabilities
•	 CT loop monitoring
•	 Individual alarm contacts (form C)
•	 Individual analog outputs to indicate insulation
resistance and ground-fault current

ORDERING NUMBER

SPECIFICATIONS

PGR-6100-120

24 Vdc/120 Vac Control Power

PGR-6100-240

240 Vac Control Power

50G/N, 51G/N, 64, 74
H 75 mm (3.0”)
W 100 mm (3.9”)
D 115 mm (4.5”)
2 Analog Outputs
5 years

Web Resources
littelfuse.com/pgr-6100

ACCESSORIES
PGC-5000 Series Ground-Fault Transformers
PGA-0500 Analog % Current Meter
PGA-0510 Analog Ohm Meter
PGH Family High Tension Couplers

PGR-6130 Electronic Overload Relay
Specifications

•	
•	
•	
•	
•	
•	
•	

IEEE Device Numbers 	
Dimensions 	
	
	
Warranty 	

No external CT required for currents up to 90 A
Cause-of-trip indication
N.O. and N.C. alarm contacts
Adjustable overload trip class setting
Adjustable current pickup
Over-temperature (PTC) protection
Thermal overload protection

ORDERING NUMBER
PGR-6131-24
PGR-6131-120
PGR-6131-240
PGR-6132-24
PGR-6132-120
PGR-6132-240
PGR-6133-24
PGR-6133-120
PGR-6133-240

8
Protection Relays & Controls

Features/Benefits

SPECIFICATIONS
24 Vdc
120 Vac
240 Vac
24 Vdc
120 Vac
240 Vac
24 Vdc
120 Vac
240 Vac

46, 49, 51
H 83 mm (3.3”)
W 78 mm (3.1”)
D 99 mm (3.9”)
5 years

Web Resources
littelfuse.com/pgr-6130

FULL-LOAD CURRENT ACCESSORIES
4-16.7 A
4-16.7 A
4-16.7 A
15-40.5 A
PGB-6130 R emote Indication
15-40.5 A
and Reset Assembly
15-40.5 A
40-91 A
40-91 A
40-91 A

PGR-6150 Motor Protection System
Features/Benefits

Specifications

•	 13 protective functions

IEEE Device Numbers 	
	
Dimensions (Relay) 	
	
	
Dimensions (OPI) 	
	
	
Communications	
Warranty 	

•	 2 relay outputs, 1 digital input
•	 No external CT required for currents up to 25 A
•	 Thermal protection through starting, running,
overload and cooling cycles
•	 RS-485 interface with Modbus® RTU
•	 Optional PGR-6150-OPI Operator Interface

37, 46, 49, 50, 50G/N,
51, 51G/N, 66
H 83 mm (3.3”)
W 78 mm (3.1”)
D 99 mm (3.95”)
H 56 mm (2.2”)
W 106 mm (4.2”)
D 23 mm (0.9”)
RS-485 with Modbus ® RTU
5 years

Web Resources
littelfuse.com/pgr-6150

ORDERING NUMBER
PGR-6150-24
PGR-6150-120
PGR-6150-OPI

littelfuse.com

SPECIFICATIONS
24/48 Vdc (Control Unit)
120/240 Vac/dc (Control Unit)
Operator Interface

154

ACCESSORIES
PGR-6150-OPI Operator Interface
PGC-6000 Series Ground-Fault Transformer

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

MOTOR PROTECTION
MPU-32 (PGR-6200) Motor Protection Unit
Features/Benefits

Specifications

•	 Reduced overcurrent setting for maintenance

IEEE Device Numbers 	
	
Dimensions 	
	
	
Communications	
	
	
Warranty 	

•	 Dynamic thermal modeling
•	 Communications for different networks
•	 Optional RTD protection
•	 Optional differential protection
•	 Conformal coating
•	 Modular system and compact design makes
installation easy for new or retrofit applications

37, 38, 46, 49, 50, 50G/N, 	
51, 51G/N, 66, 74, 86, 87
H 96 mm (3.78”)
W 96 mm (3.78”)
D 132 mm (5.2”)
RS-232 (Standard);
RS-485, DeviceNet™
Ethernet (Optional)
10 years

Web Resources

littelfuse.com/mpu-32

ORDERING NUMBER
MPU-32-00-00
MPU-32-01-00
MPU-32-02-00
MPU-32-04-00

COMMUNICATIONS
TIA-232
TIA-232 & RS-485
TIA-232 & DeviceNet™
TIA-232 & Ethernet

ACCESSORIES
Phase Current Transformers
Ground-Fault Current Transformers
MPS-RTD Temperature Input Module
MPS-DIF Differential Current Module

MPS (PGR-6300) Motor Protection System
Features/Benefits

Specifications

•	 Optional differential protection

IEEE Device Numbers 	 1, 2, 3, 5, 9, 14, 18, 19, 27, 34,
	
37, 38,46, 47, 48, 49, 50, 50G,
	
50N, 51, 51G/N, 55, 59, 66,
	
74, 81, 86, 87, 94
Dimensions (OPI) 	
H 98 mm (3.86”)
	
W 192 mm (7.56”)
	
D 0.42 mm (1.65”)
Communications	
Allen-Bradley ® DF1 & Modbus ®
	
RTU (Standard); DeviceNet™,
	Profibus ®, Ethernet (Optional)
Warranty 	
10 years

•	 Modular design makes installation easy

Web Resources

•	 Overcurrent reduction setting for maintenance
•	 Monitors voltage, current, and temperature
•	 22 motor protection functions
•	 Conformal coating
•	 Dynamic thermal modeling
•	 Starter control, Metering, and Data Logging
•	 Optional RTD protection with hazardouslocation certified RTD module

ORDERING NUMBER
MPS-CTU-01-00
MPS-CTU-02-00
MPS-CTU-03-00
MPS-CTU-04-00
MPS-OPI-01-00

littelfuse.com/mps

COMMUNICATIONS
RS-485
RS-485 & DeviceNet™
RS-485 & Profibus ®
RS-485 & Ethernet
Operator Interface

ACCESSORIES
Phase Current Transformers
Ground-Fault Current Transformers
MPS-RTD Temperature Input Module
MPS-DIF Differential Current Module

8

MPU-32-X69X (PGR-6210) & MPS-469X (PGR-6310)

Motor Protection Retrofit Kits

Ordering Information
MPS-469X

•	 Direct replacement for GE Multilin
169, 269, 369 and 469 relays
•	 Microprocessor-based protection
•	 Proven reliability
•	 Conformally coated circuit boards
•	 Pre-wired module allows minimal
change-out time
•	 Ability to match existing
overcurrent values

MODULE CONFIGURATION

MPS-469X

-

Ordering Information
MPU-32-X69X

MPU-32-X69X

1 = RS485

1 = One MPS-RTD Module

2 = RS485 & DeviceNet

2 = Two MPS-RTD Modules

3 = RS485 & Profibus

3 = One MPS-DIF Module

4 = RS485 & Ethernet

MPU-32
COMMUNICATION
X

X
0 = One Platinum 100 Ω
1 = One Platinum 100 Ω & 8-input MPS-RTD Module

© 2014 Littelfuse POWR-GARD® Products Catalog

0 = None

4 = One MPS-RTD Module & One MPS-DIF Module

RTD INPUTS
-

X

MPS
FUTURE
COMMUNICATION OPTIONS
X
000

155

0 = TIA232
1 = TIA232 & TIA485
2 = TIA232 & DeviceNet
4 = TIA232 & Ethernet

GROUND-FAULT CT
X

FUTURE
OPTIONS
00

0 = Wired for wGround-Fault CT (50 mA Secondary)
1 = Wired for 1- or 5-A Secondary Ground-Fault CT

littelfuse.com

Protection Relays & Controls

Features/Benefits

Protection Relays & Controls

PUMP AND FEEDER PROTECTION
PGR-6800 Pump Protection Relay
Features/Benefits

Specifications

•	 No external CT required for currents up to 90 A

IEEE Device Numbers 	
Dimensions 	
	
	
Warranty 	

•	 Cause-of-trip indication
•	 N.O. and N.C. alarm contacts
•	 Adjustable overload trip class setting
•	 Adjustable current pickup

Web Resources

•	 Undercurrent protection

ORDERING NUMBER
PGR-6801-24
PGR-6801-120
PGR-6801-240
PGR-6802-24
PGR-6802-120
PGR-6802-240
PGR-6803-24
PGR-6803-120
PGR-6803-240

37, 46, 49, 51
H 83 mm (3.3”)
W 78 mm (3.1”)
D 99 mm (3.9”)
5 years

littelfuse.com/pgr-6800

SPECIFICATIONS
24 Vdc
120 Vac
240 Vac
24 Vdc
120 Vac
240 Vac
24 Vdc
120 Vac
240 Vac

FULL-LOAD CURRENT ACCESSORIES
7-19.6 A
7-19.6 A
7-19.6 A
19-44.2 A
PGB-6800 - Remote Indication
19-44.2 A
and Reset Assembly
19-44.2 A
40-90.4 A
40-90.4 A
40-90.4 A

FPU-32 (PGR-7200) Feeder Protection Unit
Features/Benefits

Specifications

•	 Protection, metering, and data-logging functions

IEEE Device Numbers 	
	
Dimensions 	
	
	
Communications	
Warranty 	

•	 Programmable using the operator interface, the TIA232 port, or an optional communications network
•	 IEC & IEEE protection curves
•	 CT saturation compensation
•	 Communications for different networks
•	 Two set-point groups

26, 46, 49, 50, 50G/N,
51, 51G/N, 74, 86
H 96 mm (3.78”)
W 96 mm (3.78”)
D 132 mm (5.2”)
TIA-232, RS-485, DeviceNet™, Ethernet
10 years

Web Resources
littelfuse.com/fpu-32

SPECIFICATIONS
TIA-232 Communications
TIA-232 & RS-485 Communications
TIA-232 & DeviceNet™ Communications
TIA-232 & Ethernet Communications

ACCESSORIES
Phase Current Transformers
Ground-Fault Transformer

FPS (PGR-7300) Feeder Protection System

Protection Relays & Controls

8

ORDERING NUMBER
FPU-32-00-00
FPU-3200-01-00
FPU-3200-02-00
FPU-3200-04-00

Features/Benefits

Specifications

•	 Monitors voltage and current
•	 Long-time overcurrent provides thermal protection for
feeder or load
•	 Instantaneous overcurrent to detect catastrophic
failure
•	 Coordinations using IEEE and IEC

IEEE Device Numbers 	
	
Dimensions (OPI) 	
	
	
Warranty 	

27, 38, 46, 47, 49, 50, 50G/N,
51, 51G/N, 55, 59, 81,
H 98 mm (3.86”)
W 192 mm (7.56”)
D 0.42 mm (1.65”)
10 years

Web Resources
littelfuse.com/fps

littelfuse.com

ORDERING NUMBER

SPECIFICATIONS

FPS-CTU-01-00

RS-485 Communications

FPS-CTU-02-00

RS-485 & DeviceNet™ Communications

FPS-CTU-03-00

RS-485 & Profibus Communications

FPS-CTU-04-00

RS-485 & Ethernet Communications

FPS-OPI-01-OO

Recommended

®

156

ACCESSORIES
Phase Current Transformers
Ground-Fault Current Transformer
MPS-RTD Temperature Input Module
SE-IP65CVR-M Cover

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

ARC-FLASH PROTECTION AND GFCI
PGR-8800 (D1000) Arc-Flash Protection Relay
Description
The PGR-8800 is a microprocessor-based relay that limits arc-fault
damage by detecting the light from an arc flash and rapidly tripping.
Phase-current-transformer inputs are provided for current-constrained
arc-flash protection and, when so equipped, a programmable definitetime overcurrent function can be enabled. An optical sensor on the
PGR-8800 and adjustable trip level reduce the chance of nuisance
tripping by setting a threshold for ambient light. Sensors, inputs, and
connections are monitored to ensure fail-safe operation. A secondary
solid-state trip circuit provides a redundant trip path. A USB port is used
for configuration and access to event logs and graphs.

Ordering Information

Specifications

ORDERING NUMBER

COMMUNICATIONS

PGR-8800-00 (UL, CE, C-tick)

Multi-unit linking, Modbus RTU

ACCESSORIES

REQUIREMENT

PGA-LS10 (A1000)
PGA-LS20 (A2000)/
PGA-LS25 (A2000.0020)
PGA-LS30 (A2000.0030)
PGA-1100 (D1100)

Required*

Optional

IEEE Device Numbers	
Overcurrent (50), Arc Flash (AFD)
Input Voltage	
100-240 Vac, 14-48 Vdc, and 110-250 Vdc
H 130 mm (5.2”); W 200 mm (7.9”);
Dimensions	
D 54 mm (2.2”)
9-25 klux, 800 μs-20 s
Optical Trip Settings	
Current Trip Setting (A)	
Programmable
Indication Contact Mode	
Fail-safe
(1)
24-300 Vdc, 24-300 Vac
Trip Coil Voltage 	
Expandable System	
Link up to 4 PGR-8800 units
Warranty	
5 years
DIN (with D0050 adapter clips), Surface
Mounting 	

Current Transformer

Recommended

Web Resources

®

Required*

littelfuse.com/arcflash

*At least one sensor is required. However, the exact number of sensors for proper coverage
depends on the application.

Industrial Shock-Block Ground-Fault Circuit Interruption
Open-Chassis Model

Description
Special Purpose Ground-Fault Circuit Interrupter (GFCI),
Class C and Class D

Industrial Shock Block (ISB) is a personnel protection device designed to
meet the new requirements for special-purpose GFCIs defined by UL
943C. ISB is the first and only permanently connected Class C and Class
D GFCI on the market. Class C GFCIs is introduced to be used on systems
where the line-to-line voltage is 480 V or less with a trip level of 20 mA,
while Class D GFCI is intended to be used on 600 V systems. These
improvements to the standard Class A GFCI (6 mA trip level used on 240 V
systems or less) were made to allow the use of GFCIs in industrial facilities.

Equipment Ground-Fault Protective Device (EGFPD)

ISB is also available with adjustable protection settings as an EGFPD. The
EGFPD models can be set to trip at 6, 10, 20 or 30 mA. This offers more
flexibility since GFCI devices are not allowed to have an adjustable trip level.

Ordering Information
ORDERING
NUMBER

VOLTAGE
(V)

SB6100-00x-0

208

SB6100-10x-0

240

SB6100-20x-0

480

SB6100-30x-0

600

SB6100-01x-0

208

SB6100-11x-0

240

SB6100-21x-0

480

SB6100-31x-0

600

TRIP
LEVEL (mA)

20
(Fixed)

Specifications

UL CATEGORY/CLASS

Voltage Rating	
See ordering information
Amperage Rating	
100 A (continuous)
Short Circuit Rating	
50,000 A
Trip Level Settings	Selectable (6, 10, 20, 30 mA), or
fixed at 20 mA
Inverse time trip curve
Trip Time Setting 	
Dimensions	
Enclosed: H 453.8 mm (17.9”);
	
W 406.2 mm (16.0”); D 223.3 mm (8.8”)
	
Open-chassis: H 455.0 mm (17.9”);
	
W 340.7 mm (13.4”); D 174.9 mm (6.8”)

UL 943C Class C
special-purpose GFCI
UL 943C Class D
special-purpose GFCI

UL 943/UL 1053
6, 10, 20, 30
Equipment ground-fault
(Selectable)
protective device (EGFPD)

Web Resources
littelfuse.com/IndustrialShockBlock

Note: x=0 for open-chassis models and 1 for enclosed models

© 2014 Littelfuse POWR-GARD® Products Catalog

157

littelfuse.com

Protection Relays & Controls

Enclosed Model

Operator Interface

8

Protection Relays & Controls

GENERATOR & SINGLE-FUNCTION PROTECTION
PGR-4300 Generator Ground-Fault Relay
Features/Benefits

Specifications

•	 No CTs required

IEEE Device Numbers 	
Dimensions 	
	
	
Communications	
Warranty 	

•	 Provides a simple method for tripping a groundfault condition on generators
•	 Use with 3- or 4-pole transfer switches
•	 Monitors neutral-to-ground integrity
•	 Adjustable pick-up settings from 100 to 1200 A
•	 Adjustable time-delay settings from 0 to 1 sec

50G/N, 51G/N
H 75 mm (3.0”)
W 55 mm (2.2”)
D 115 mm (4.5”)
Analog Output
5 Year

Web Resources
littelfuse.com/pgr-4300

ORDERING NUMBER

SPECIFICATIONS

ACCESSORIES

PGR-4300-12
PGR-4300-24
PGR-4300-120

12 Vdc Control Power
24 Vdc Control Power
120 Vac Control Power

PGA-0500 Analog Current Meter

G2000 Power Relay
Features/Benefits

Specifications

•	 Detects power level for protection, control and
monitoring

Supply 	
Input Voltage 	
Input Current 	
Frequency 	
Dimensions 	
	
	

•	 PC configuration for forward power or reverse
power functionality
•	 User configured scales and setpoints suits a
broad variety of applications
•	 63 Vac to 690 Vac systems can be monitored by
the same unit

ORDERING NUMBER SPECIFICATIONS

G2000.0010

24 Vdc, 5 A Control Power

8-36 Vdc/0.75 W at 24 Vdc
63-690 Vac ± 30%
5 A CT, max. 10 A
35-75 Hz
H 73 mm (2.9”)
W 75 mm (3.0”)
D 114 mm (4.5”)

Web Resources

littelfuse.com/g2000

ACCESSORIES

G0100 Programming Kit

8
Protection Relays & Controls

G3000 Frequency Relay
Features/Benefits

Specifications

•	 Frequency monitor generators, busbars or other
distribution systems
•	 PC configuration for over and under frequency
protection one unit

Supply 	
Input Voltage 	
Input Current 	
Frequency 	
Dimensions 	
	
	

•	 User configured scales and setpoints suits a
broad variety of applications
•	 63 Vac to 690 Vac systems can be monitored by
the same unit

littelfuse.com

Web Resources

littelfuse.com/g3000

ORDERING NUMBER

SPECIFICATIONS

ACCESSORIES

G3000.0010

24 Vdc Control Power

G0100 Programming Kit

158

8-36 Vdc/0.75 W at 24 Vdc
63-690 Vac ± 30%
5 A CT, max. 10 A
35-75 Hz
H 73 mm (2.9”)
W 75 mm (3.0”)
D 114 mm (4.5”)

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

GENERATOR & SINGLE-FUNCTION PROTECTION
G3300 Voltage Relay
Features/Benefits

Specifications

•	 Monitors voltage on generators, busbars or other
distribution systems

Supply 	
Input Voltage 	
Frequency 	
Dimensions 	
	
	

•	 PC configuration for over and undervoltage
protection in one relay
•	 User configured scales and setpoints suits a
broad variety of applications

Web Resources

•	 Phase symmetry monitor enables use in grid
connection applications

8-36 Vdc/0.75 W at 24 Vdc
63-690 Vac ± 30%
35-75 Hz
H 73 mm (2.9”)
W 75 mm (3.0”)
D 114 mm (4.5”)

littelfuse.com/g3300

•	 63 Vac to 690 Vac systems can be monitored by
the same unit

ORDERING NUMBER SPECIFICATIONS

G3300.0010

ACCESSORIES

24 Vdc Control Power

G0100 Programming Kit

T2000 Reverse Power Relay
Features/Benefits

Specifications

•	 Protects the generator from being run as an
electric motor

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to ensure
correct operation in spite of voltage supply
fluctuations
•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER
T2000.0010
T2000.0020
T2000.0030
T2000.0040
T2000.0050
T2000.0060
T2000.0070
T2000.0080
T2000.0090
T2000.0100
T2000.0110
T2000.0120
T2000.0130
T2000.0140
T2000.0150
T2000.0160

TERMINALS 1-3
230 V
450 V
127 V
110 V
110 V
230 V
660 V
450 V
127 V
110 V
450 V
480 V
230 V
230 V
480 V
450 V

Web Resources

2-20% IN
2-20 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

littelfuse.com/t2000

TERMINALS 2-3
400 V
120 V
100 V
100 V
400 V
120 V
100 V
400 V
415 V
415 V
400 V

IN
5A
5A
5A
5A
5A
1A
5A
5A
5A
1A
5A
5A
5A
5A
1A
1A

SUPPLY
L-N
L-L
L-N
L-L
L-L
L-N
L-L
L-N
L-L
L-L
L-L
L-L
L-N
L-L
L-L
L-L

8

Features/Benefits

Specifications

•	 Protects against loss of excitation in a
synchronous generator

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to ensure
correct operation in spite of voltage supply
fluctuations
•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER

T2100.0010
T2100.0020
T2100.0030
T2100.0040
T2100.0050
T2100.0060
T2100.0070
T2100.0080

© 2014 Littelfuse POWR-GARD® Products Catalog

TERMINALS 1-3

230 V
480 V
450 V
110 V
110 V
110 V
480 V
110 V

0.5-1.5 x IN
2-20 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

littelfuse.com/t2100

TERMINALS 2-3

415 V
400 V
100 V
100 V
100 V
415 V
100 V
159

Web Resources

Protection Relays & Controls

T2100 Excitation Loss Relay

IN

5A
5A
5A
1A
5A
5A
5A
5A

SUPPLY

L-N
L-L
L-L
L-L
L-L
L-L
L-L
L-L

littelfuse.com

Protection Relays & Controls

GENERATOR & SINGLE-FUNCTION PROTECTION
T2200 3-Phase Overcurrent Relay
Features/Benefits

Specifications

•	 Designed for generator or feeder protection
against overcurrent in each of the 3 phases

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations
•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER
T2200.0010
T2200.0020
T2200.0030
T2200.0040
T2200.0050
T2200.0060
T2200.0070
T2200.0080
T2200.0090
T2200.0100
T2200.0110

TERMINALS 1-3
450 V
450 V
230 V
230 V
230 V
450 V
110 V
480 V
24 Vdc
450 V
450 V

TERMINALS 2-3
400 V
400 V
110 V
400 V
100 V
415 V
400 V
400 V

0.5-1.4 x IN
3-30 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/t2200

IN
5A
5A
5A
5A
1A
5A
5A
5A
5A
5A
1A

FUNCTION
Latching output, resetable
Normally energized output, latching, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
Normally energized output, latching, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
Instantly extra output relay
Instantly extra output relay

T2300 3-Phase Short-Circuit Relay
Features/Benefits

Specifications

•	 Designed for protection of generators, power
transmissions and consumer’s supply against
short circuit

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations
•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER
T2300.0100
T2300.0020
T2300.0030
T2300.0040
T2300.0050
T2300.0060
T2300.0070

TERMINALS 2-3
400 V
400 V
415 V

Web Resources

littelfuse.com/t2300

IN
5A
5A
5A
1A
5A
5A
1A

FUNCTION

Normally de-energized output

T2400 3-Phase Dual Overcurrent Relay

Protection Relays & Controls

8

TERMINALS 1-3
230 V
450 V
24 Vdc
24 Vdc
450 V
480 V
230 V

1.0-4.0 x IN
0.1-1.0 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Features/Benefits

Specifications

•	 Includes 2 combined overcurrent designed
for protection or monitoring of generators and
power transmissions

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations
•	 Combining 2 relays is an economic solution for
non-essential load tripping and occupying less
space in the switch panel

littelfuse.com

Web Resources

littelfuse.com/t2400

TERMINALS 1-3
230 V
450 V
110 V

400 V
100 V

IN
5A
5A
5A

T2400.0040

450 V

400 V

5A

T2400.0050
T2400.0060

480 V
450 V

415 V
400 V

5A
1A

T2400.0070

450 V

400 V

5A

T2400.0080
T2400.0090

127 V
24 Vdc

120 V

5A
5A

ORDERING NUMBER
T2400.0010
T2400.0020
T2400.0030

160

TERMINALS 2-3

0.5-1.4 x IN
3-30 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

FUNCTION

Latching output on relay 1,
6-60 sec. delay on relay 1
Latching output on relay 1,
normally energized relay 1

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

GENERATOR & SINGLE-FUNCTION PROTECTION
T2500 Overcurrent and Short-Circuit Relay
Features/Benefits

Specifications

•	 The short-circuit relays protects against faults
causing high currents and the overcurrent relay
protects against thermal damage

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

Web Resources

•	 Combining 2 relays is an economic solution,
occupying less space in the switch panel

ORDERING NUMBER
T2500.0010
T2500.0020
T2500.0030
T2500.0040
T2500.0050
T2500.0060
T2500.0070
T2500.0080
T2500.0090
T2500.0100
T2500.0110
T2500.0120

TERMINALS 1-3
450 V
230 V
480 V
450 V
24 Vdc
230 V
450 V
450 V
480 V
24 Vdc
450 V

0.5-1.4 x IN
3-30 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

littelfuse.com/t2500

TERMINALS 2-3
400 V
415 V
400 V
400 V
400 V
415 V
400 V

24 Vdc

IN
5A
5A
5A
1A
5A
5A
5A
5A
5A
1A
5A
5A

FUNCTION
Latching output, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
Latching output, resetable
De-energized extra output relay
De-energized extra output relay
De-energized extra output relay, latching outputs
De-energized extra output relay
De-energized extra output relay
De-energized extra output relay, latching short
circuit output
De-energized extra output relay, de-energized
relay 1, no internal power backup

T2700 Power Relay
Features/Benefits

Specifications

•	 Detects power levels for protection, control or
monitoring and will protect against excessive
active loads

Trip level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

Web Resources

•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER
T2700.00
T2700.02
T2700.03
T2700.04
T2700-08

TERMINALS 1-3
230 V
450 V
230 V
110 V
127 V

littelfuse.com/t2700

TERMINALS 2-3
400 V
400 V
100 V
120 V

15-150 x IN
2-20 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

IN
5A
5A
5A
5A
5A

SUPPLY
L-N
L-L
L-L
L-L
L-N

FUNCTION

8

Normally energized output

Features/Benefits

Specifications

•	 Monitors current leakage in generators and
measures the differential current of each
of the 3 phases

Trip level 	
Delay 	
	
Max. Voltage 	
Dimensions 	
	
	

•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage supply
fluctuations
•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

ORDERING NUMBER
T2900.0010
T2900.0020
T2900.0030
T2900.0040

© 2014 Littelfuse POWR-GARD® Products Catalog

TERMINALS 1-3
450 V
230 V
480 V
110 V

161

0.04-0.4 x IN
1-10 sec.
(0.1-1 sec. bridging terminals 18/19)
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/t2900

TERMINALS 2-3
400 V
415 V
100 V

IN
5A
5A
5A
5A

littelfuse.com

Protection Relays & Controls

T2900 3-Phase Differential Relay

Protection Relays & Controls

GENERATOR & SINGLE-FUNCTION PROTECTION
T3000 Frequency Relay
Features/Benefits

Specifications

•	 Frequency monitor generators, busbars or other
distribution systems
•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

Overfrequency Level 	
Delay 	
Underfrequency Level 	
Delay 	
Max. Voltage 	
Dimensions 	
	
	

•	 Visual indication of power, pick-up and output trip
provides quick and concise status information
•	 Combining 2 relays is an economic solution
for monitoring both underfrequency and
overfrquency in the same unit

ORDERING NUMBER
T3000.0010
T3000.0020
T3000.0030
T3000.0040
T3000.0050

45-65 Hz
1-10 sec.
45-65 Hz
1-10 sec.
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/t3000

TERMINALS 1-3
230 V
450 V
110 V
480 V
127 V

TERMINALS 2-3
400 V
100 V
415 V
120 V

T3100 Voltage Relay
Features/Benefits

Specifications

•	 Monitors voltage on generators, busbars or other
distribution systems

Overvoltage level 	
Delay 	
Undervoltage Level 	
Max. Voltage 	
Dimensions 	
	
	

•	 Signals when voltage is out of its limits
•	 Consists of two, one for overvoltage and one for
undervoltage monitoring
•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

ORDERING NUMBER
T3100.0010
T3100.0020
T3100.0030
T3100.0040
T3100.0060

8

100-120%
1-10 sec.
80-100%
660 V
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/t3100

TERMINALS 1-3
230 V
450 V
110 V
480 V
127 V

TERMINALS 2-3
400 V
100 V
415 V
120 V

Protection Relays & Controls

T3300 3-Phase Voltage Relay
Features/Benefits

Specifications

•	 Monitors voltage on generators, busbars or other
distribution systems

Overvoltage Level 	
Delay 	
Undervoltage Level 	
Max. Voltage 	
Dimensions 	
	
	

•	 Signals when voltage is out of its limits
•	 Consists of two, one for overvoltage and one for
undervoltage monitoring
•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

ORDERING NUMBER
T3300.0010
T3300.0020
T3300.0030
T3300.0040

littelfuse.com

Web Resources

littelfuse.com/t3300

TERMINALS 17-19, 21-23, 25-27
230 V
450 V
110 V
480 V

162

100-120%
1-10 sec.
80-100%
660 V
H 70 mm (2.8”)
W 150 mm (5.9”)
D 115 mm (4.5”)

TERMINALS 18-19, 22-23, 26-27
400 V
100 V
415 V

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

GENERATOR CONTROL
T2600 Dual-Current Relay
Features/Benefits

Specifications

•	 Start or stop the standby diesel generator
according to the load situation
•	 Accepts high supply voltage variation to
ensure correct operation in spite of voltage
supply fluctuations

Max. Voltage 	
Voltage Range 	
Dimensions 	
	
	

•	 Visual indication of power, pick-up and output trip
provides quick and concise status information

Web Resources

ORDERING NUMBER
T2600.0010
T2600.0020
T2600.0030
T2600.0040
T2600.0050
T2600.0060
T2600.0070
T2600.0080
T2600.0090

TERMINALS 1-3
230 V
450 V
480 V
450 V
480 V
110 V
110 V
230 V

TERMINALS 2-3
400 V
415 V
400 V
100 V
100 V

600 V
70-110%
H 70 mm (2.8”)
W 150 mm (5.9”)
D 115 mm (4.5”)

littelfuse.com/t2600

IN
5A
5A
5A
5A
5A
5A
5A
5A

FUNCTION
30 sec. or 1 sec.*
30 sec. or 1 sec.*
30 sec. or 1 sec.*
30 sec.*, bridge 17-18 = stop current increased 34%
30 sec.*, bridge 17-18 = stop current increased 34%
30 sec. or 1 sec.*
30 sec. or 1 sec.*, start current delay 1.0-10 secs
30 sec. or 1 sec.*, normally de-energized start relay
Extension Unit

T4500 Auto Synchronizer for Conventional Governors
Features/Benefits

Specifications

•	 Provides automatic synchronization of a generator
to a busbar quickly via speed controller
•	 Inputs for disabling internal frequency control
enables synchronization to external setpoint
from other busbar sections, generators or
the main grid

Max. Voltage 	
Voltage Range 	
Dimensions 	
	
	

•	 Visual indication of signals provides quick and
concise status information

littelfuse.com/t4500

ORDERING NUMBER

T4500.0010
T4500.0020
T4500.0030
T4500.0040
T4500.0050
T4500.0060
T4500.0070

600 V
70-110%
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

TERMINALS 1-3, 5-7

TERMINALS 2-3, 6-7

450 V
230 V
480 V
110 V
127 V
110 V
600 V

400 V
415 V
63 V
120 V
100 V

8

Features/Benefits

Specifications

•	 Provides automatic load sharing and frequency
control for parallel running generators
•	 Inputs for disabling internal frequency control
enables operation where system frequency is
set externally such as in grid-parallel operation

Max. Voltage 	
Voltage Range 	
Dimensions 	
	
	

•	 Visual indication of signals provides quick and
concise status information

Web Resources

ORDERING NUMBER

T4800.0010
T4800.0020
T4800.0030
T4800.0040
T4800.0050
T4800.0060
T4800.0070

© 2014 Littelfuse POWR-GARD® Products Catalog

TERMINALS 1-3

450 V
230 V
480 V
110 V
450 V
127 V
110 V

163

600 V
70-110%
H 70 mm (2.8”)
W 150 mm (5.9”)
D 115 mm (4.5”)

littelfuse.com/t4800

TERMINALS 2-3

400 V
415 V
100 V
400 V
120 V
100 V

IN

5A
5A
5A
1A
1A
5A
5A

littelfuse.com

Protection Relays & Controls

T4800 Load Sharer for Conventional Governors

Protection Relays & Controls

GENERATOR CONTROL
T4900 VAR Load Sharer
Features/Benefits

Specifications

•	 Provides automatic load sharing of reactive power
and voltage control for parallel running generators
•	 Inputs for disabling internal voltage control
enables operation where system voltage is set
externally such as in grid-parallel operation

Max. Voltage 	
Voltage Range 	
Dimensions 	
	
	

•	 Visual indication of voltage increase/decrease
provides quick and concise status information

Web Resources

ORDERING NUMBER
T4900.0010
T4900.0020
T4900.0030
T4900.0040
T4900.0050
T4900.0060

TERMINALS 1-3
450 V
230 V
480 V
110 V
127 V
110 V

660 V
110%
H 70 mm (2.8”)
W 150 mm (5.9”)
D 115 mm (4.5”)

littelfuse.com/t4900

TERMINALS 2-3
400 V
–
415 V
63 V
120 V
100 V

IN
5A
5A
5A
5A
1A
1A

ACCESSORIES
T4910-07 Potentiometer with Cable
for External Power Factor Setting

T5000 Paralleling Relay
Features/Benefits

Specifications

•	 Inhibits closure of circuit breaker if synchronizing
parameters such as voltage, frequency and phase
angle are outside limits
•	 Prevents generator damage and disturbance
to busbar
•	 Visual indication of voltage and closing signal
provides quick and concise status information

Max. Voltage 	
Voltage Range 	
Dimensions 	
	
	

ORDERING NUMBER
T5000.0010
T5000.0020
T5000.0030
T5000.0040
T5000.0050
T5000.0060
T5000.0070
T5000.0080
T5000.0090
T5000.0100

8

TERMINALS 1-3
450 V
230 V
480 V
110 V
127 V
480 V
450 V
110 V
450 V
660 V

600 V
70-110%
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/t5000

TERMINALS 2-3
400 V
415 V
100 V
120 V
415 V
400 V
100 V
400 V

FUNCTION

Df=9-13.5°, DF=0.2-0.3 Hz
DU=15-20%, Df=9-13.5°, DF=0.2-0.3 Hz
DU=15-20%, Df=9-13.5°, DF=0.2-0.3n Hz
Df=9-13.5°, DF=0.2-0.3 Hz

Protection Relays & Controls

E7800 Motorized Potentiometer
Features/Benefits

Specifications

•	 Interface between increase/decrease contacts
and a device requiring control/adjustments by an
external potentiometer
•	 Can be used as speed trim of an electric speed
governor in generator applications

Voltage Range 	
Consumption 	
Dimensions 	
	
	

•	 Wire would for longer life than carbon
potentiometers

littelfuse.com/e7800

ORDERING NUMBER
E7800.00.xx
E7800.01.xx
E7800.02.xx
E7800.03.xx
E7800.04.xx
E7800.05.xx
E7800.09.xx
E7800.23.xx
E7800.24.xx
E7800.90.00
littelfuse.com

VOLTAGE
230 V-240 Vac
220 V-240 Vac
100 V-110 Vac
24 Vac
100 V-110 Vac
220 V-240 Vac
24 Vac
24 Vdc
24 Vdc
24 Vdc

164

Web Resources

RPM
1.0 (50 Hz)
2.0 (50 Hz)
1.0 (50 Hz)
2.0 (50 Hz)
2.0 (50 Hz)
2.0 (50 Hz)
1.0 (50 Hz)
0.8-6 Adj.
0.8-6 Adj.
0.8-6 Adj.

AC: 90-120% DC: 75-125%
AC: 2.5 VA DC: 2 W
H 96 mm (3.8”)
W 96 mm (3.8”)
D 80 mm (3.1”)

POTENTIOMETER
5 kΩ-1 turn
5 kΩ-10 turn
5 kΩ-1 turn
5 kΩ-10 turn
5 kΩ-10 turn
5 kΩ-1 turn
5 kΩ-1 turn
5 kΩ-1 turn
5 kΩ-10 turn
DC output voltage, 0-1.0 V (0-100%)
© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

GENERATOR CONTROL
T7900 Electronic Potentiometer
Features/Benefits

Specifications

•	 Used as a converter between pulse contacts and a
device requiring control adjustment by a voltage or
current signal
•	 Wide selection of output ranges including PWM
which ensures possible use with a broad variety
of speed governors and voltage regulators

Supply 	
Consumption 	
Dimensions 	
	
	

•	 Independent ramp-up and ramp-down time
setting provides optimum controllability

littelfuse.com/t7900

ORDERING NUMBER
T7900.0010

8-36 Vdc/Vac
Max. 120 mA at 24 Vdc
H 70 mm (2.8”)
W 100 mm (3.9”)
D 115 mm (4.5”)

Web Resources

TERMINALS 11-12

TERMINALS 1-3

24 Vdc/Vac

T7900.0030

250 Vac

M8100 Synchroscope
Features/Benefits

Specifications

•	 Provides illuminated indication of the phase and
frequency difference between voltages on two
separate AC systems
•	 High resolutions visual indications by 38 LEDs
•	 Available with check synchronizer relay which
enables use as manual synchronizing unit, or as
auto -synchronizing back-up

Max. Voltage 	
Voltage Range 	
Consumption	
Dimensions 	
	
	

600 V
70-110%
2x3 VA max.
H 96 mm (3.8”)
W 96 mm (3.8”)
D 80 mm (3.1”)

Web Resources

littelfuse.com/m8100

ORDERING NUMBER
M8100.0010
M8100.0020
M8100.0030
M8100.0040
M8100.0050
M8100.0060
M8100.0070
M8100.0080

TERMINALS 1-1, 5-7
450 V
230 V
480 V
110 V
450 V
230 V
480 V
110 V

TERMINALS 1-3, 6-7
400 V

FUNCTION

415 V
100 V
400 V

With check synchronizer relay
With check synchronizer relay
With check synchronizer relay
With check synchronizer relay

415 V
100 V

Features/Benefits

Specifications

•	 Enables fast clearing of a blackout
•	 Monitors up to four generators or eight
generators with two units

Supply Voltage 	
Max. Voltage	
Frequency Range 	
Dimensions 	
	
	

•	 Independent 24 Vdc supply with wide tolerance
operates regardless of system voltage failure

24 Vdc 30%
660 Vac
35-70 Hz
H 70 mm (2.7”)
W 150 mm (5.9”)
D 115 mm (4.5”)

Web Resources

littelfuse.com/m8400

ORDERING NUMBER
T8400.0010
T8400.0020
T8400.0030
T8400.0040
T8400.0050
T8400.0060

© 2014 Littelfuse POWR-GARD® Products Catalog

TERMINALS 1-3, 8-10, 17-19, 24-26
400 V
400 V
230 V
230 V
415 V
415 V

165

FUNCTION
1-1.5-2-2.5 sec.
3-3.5-4-4.5 sec.
1-1.5-2-2.5 sec.
3-3.5-4-4.5 sec.
1-1.5-2-2.5 sec.
3-3.5-4-4.5 sec.

littelfuse.com

Protection Relays & Controls

T8400 Blackout Limiter

8

Protection Relays & Controls

GENERATOR CONTROL
C6200 FlexGen Standard Generator Control
Description

Specifications

FlexGen controllers are intended for paralleling
of generators with each other or with the grid.
One FlexGen controller is installed for each
generator in the installation and handles all
electrical control.
Both Basic and Advanced versions include
basic functions such as auto-synchronizing,
frequency control, active load sharing, dead
bus monitoring and reverse power protection.
In addition the FlexGen Advanced contains
reactive load sharing, voltage matching, power
factor control, grid-parallel operation control,
and protection against excitation loss, RoCoF
(df/dt), and vector shift.

Auxiliary Supply 	
	
Generator Voltage	
Generator Rated Frequency	
C/T Secondary Current	
Consumption	
Ambient Temp Range	
Dimensions 	
	
	

10 Vdc to 36 Vdc
(24 Vdc-58%/+50%)
63 V-690 V
50 Hz/60 Hz
5A
7W
–20°C to +70°C
H 182 mm (7.2”)
W 282 mm (11.1”)
D 50 mm (2.0”)

Web Resources

littelfuse.com/c6200

Features/Benefits
•	 3-phase true RMS measurement is more
reliable and immune to high noise
•	 Analog outputs for speed and voltage
control fit most electronic governors and
•	 10 programmable inputs and outputs
for flexible configuration on wide
range of applications

ORDERING NUMBER

MODEL NAME

C6200.0060

FlexGen Basic

C6200.0100

FlexGen Advanced

ACCESSORIES
C6500 FlexGen UI User Interface Module

S6000 Sigma Advanced Protection Module
Description

Features/Benefits

The SIGMA Generator Control and Protection
System is a range of integrated modules for
protection and control of marine and land
based generators. The modules are marine
approved and include all relevant functions,
such as protection of generators, synchronizing
and active/ reactive load sharing and Power
Management.

8
Protection Relays & Controls

IO/P Module S6000
Input/ Output and Protection Module
The SIGMA S6000 performs all measurements
on the generator side (voltages, currents,
frequency), does the generator protection,
includes a non-essential load trip in
two steps and includes three measurement
transducers.
S/LS Module S6100
Synchronizing and Load-Sharing Module
This module performs the control functions
like synchronizing and active and reactive load
sharing. It performs the measurements on the
busbar side.

littelfuse.com

•	 3-phase true RMS measurement is more
reliable and immune to high noise
•	 Analog outputs for speed and voltage control
fit most electronic governors and
•	 Large consumer request inputs with load
feedback optimizes quantity of running
generators and saves fuel

Specifications

Primary Supply 	
Backup Supply	
Environmental
Temp Range 	
Dimensions 	
	
	

–15°C to +70°C
H 145 mm (5.7”)
W 190 mm (7.5”)
D 64 mm (2.5”)

Web Resources

littelfuse.com/s6000

ORDERING NUMBER

DESCRIPTION

S6000.0010

Input/ Output and Protection Module– 5 A C/T

S6000.0020

Input/ Output and Protection Module– 1 A C/T

S6100.0010

Synchronization and Load Sharing Module

166

+24 Vdc (-30%/+30%) Isolated, 500 mA
+24 Vdc (-30%/+30%) Isolated, 500 mA

ACCESSORIES
S6500.0010 Power Manager Module
S6610.0010 User Interface Module

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

ENGINE CONTROL AND DIAGNOSIS
M2000 Engine Control
Features/Benefits

Specifications

•	 Controls start and stop of the engine, monitors
and protects the engine during start and
operation, and simultaneously indicates the
engine and alarm status on the front of the unit
•	 Eight inputs for monitoring e.g. oil pressure,
coolant, temperature and engine speed

Voltage Supply 	
Consumption 	
Dimensions 	
	
	

•	 Cable monitoring on sensor inputs for a
fail safe system

littelfuse.com/m2000

12-24 Vdc±30% (8-32 Vdc)
Max. 180 mA
H 144 mm (5.7”)
W 144 mm (5.7”)
D 35 mm (1.4”)

Web Resources

•	 Can be combined with M0600 to build a
complete control, alarm and safety system for
marine engines

ORDERING NUMBER

CONTROL POWER

M2000.0130

ACCESSORIES
M0600 Shutdown Unit
M0500 Tacho Detector
K3452 RS232 Cable

12-24 Vdc, IP54 at front

M2500 Engine Control and Monitoring Unit
Features/Benefits

Specifications

•	 Control and monitor engines in marine
applications such as auxiliary generators,
emergency generators and propulsion engines
•	 Allows manual (local) and automatic (remote)
start of the engine and will monitor all
engine parameters

Operating Temp.	
Humidity 	
Dimensions 	
	
	

•	 Nine digital alarm/shutdown inputs for monitoring
e.g. oil pressure, coolant, temperature and
engine speed

littelfuse.com/m2500

–15°C to +70°C
95%
H 137 mm (6.2”)
W 209 mm (8.2”)
D 39 mm (1.5”)

Web Resources

•	 Combine with M2600 to bui ld a complete
control, alarm and safety system for
marine engines

ORDERING NUMBER

CONTROL POWER

M2500.0010

ACCESSORIES
M2600 Shutdown Unit
K2502 SD Card
K1025 USB A to B Cable

12-24 Vdc

8

Features/Benefits

Specifications

•	 Reliable robust tool for engine diagnostics,
consisting of a cylinder pressure analyzer for
collection of measurements, a pressure sensor,
an optional top dead center sensor and an optional
crank angle sensor

Pressure Range	
Pressure Accuracy 	
Temperature Range 	
Dimensions 	
	
	

•	 Tune and balance engine during operation
•	 Large display and intuitive software for
easy operation

Web Resources

littelfuse.com/e5000

ORDERING NUMBER

DESCRIPTION

E5000.1000

EngineEye Basic (E5000.0010 and E5100.0010)

E5000.3000

EngineEye Professional
(E5000.0030, E5100.0010 and E5300.0010)

© 2014 Littelfuse POWR-GARD® Products Catalog

167

0-250 Bar
1%
–50 to +350°C
H 150 mm (5.9”)
W 260 mm (10.2”)
D 55 mm (2.2”)

ACCESSORIES
See datasheet at:
littelfuse.com/e5000

littelfuse.com

Protection Relays & Controls

E5000 Handheld EngineEye Unit

Protection Relays & Controls

ALARM MONITORING
M1000 Alarm Monitor
Features/Benefits

Specifications

•	 Alarm panel with ten digital inputs that trigger
a corresponding LED to flash with a common
alarm and siren output
•	 Supports both normally open and normally
closed input contacts

Voltage Supply	
	
Siren Relay Contact	
Communication	
Dimensions 	
	
	

•	 Multiple units can be connected ad one system
for a modular and scalable solution

Web Resources

12-24 Vdc –30/+30% (8-32 Vdc)
48-110 Vdc –30/+40% (33-155 Vdc)
220 Vac/2 A; 30 Vdc/2 A, 30 W
RS485 Interface
H 144 mm (5.7”)
W 144 mm (5.7”)
D 35 mm (1.4”)

littelfuse.com/m1000

ORDERING NUMBER
M1000.0040
M1000.0080
M1000.0220

CONTROL POWER
48-110 Vdc
12-24 Vdc
12-24 Vdc

FUNCTION
IP54 front
IP54 front
Internal siren, IP54 at front

M3000 Analog Alarm Annunciator
Features/Benefits

Specifications

•	 24 inputs that can be configured individually for
dry contact (normally open or normally closed)
inputs or analog inputs

Voltage Supply	
24 Vdc ±30%
Consumption	
Max. 400 mA
Sensor Inputs	24
Alarms	48
LEDs	24
Communication	
RS485 Interface
Dimensions 	
H 144 mm (5.7”)
	
W 144 mm (5.7”)
	
D 70 mm (2.7”)

•	 Programmable 10-character LCD text so each
alarm is indicated clearly
•	 24 inputs and 48 alarms allow for individual
reference to any input and easy configuration of
group and individual alarms

Web Resources

littelfuse.com/m3000

ORDERING NUMBER
M3000.0010

CONTROL POWER
24 Vdc

ACCESSORIES
M1500 PT100 6-way Transmitter

8
Protection Relays & Controls

M4200 Alarm Monitor
Features/Benefits

Specifications

•	 Cost effective solution, with the possibility of
monitoring eight individual sensors

Voltage Supply	
Consumption	
Relay Output	
Dimensions 	
	
	

•	 Supports both normally open and normally
closed input contacts
•	 Programmable LED color change allows flexible
adjustment according to application
•	 Cable monitoring on sensor inputs indicates
sensor health in case a sensor is lost

ORDERING NUMBER
M4200.0010

littelfuse.com

Web Resources

8.4-40 Vdc; 8.4-50 Vac
Max. 180 mA
Max. 250 Vac/6 A
H 96 mm (3.8”)
W 96 mm (3.8”)
D 20 mm (0.8”)

littelfuse.com/m4200

CONTROL POWER
24 Vdc

168

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

ALARM MONITORING
M4500, M4600 & M4700 Alarm Indicators
Features/Benefits

Specifications

The M4500, M4600 and M4700 Indicator Panels
are intended for status indication of any process
providing on/off outputs. The panels contain 6, 8
or 20 channels.

Voltage Supply 	
24 Vdc ±25%
Dimensions 	
M4500: H 72 mm (2.8”)
	
W 72 mm (2.8”) D 67 mm (2.6”)
	M4600: H 96 mm (3.8)
	
W 96 mm (3.8”) D 67 mm (2.6”)
	M4700: H 144 mm (5.7”)
	
W 144 mm (5.7”) D 67 mm (2.6”)

•	 Clamping fittings and plug-in terminal blocks
allow for easy installation
•	 RS485 communication available for a remote
display or PLCs

ORDERING NUMBER
M4500.0010
M4500.0020
M4500.0030
M4500.0040
M4500.0050
M4500.0060
M4600.0010
M4600.0020
M4600.0030
M4600.0040
M4600.0050
M4600.0060
M4600.0070
M4700.0010
M4700.0020
M4700.0030
M4700.0040
M4700.0050
M4700.0060
M4700.0070
M4700.0080
M4700.0090
M4700.0100
M4700.0110
M4700.0120*
M4700.0120*
M4700.0130†
M4780.0010‡

CONTROL POWER
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
110 Vdc
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
110 Vdc
24 Vdc/Vac
48 Vdc/Vac
12 Vdc/Vac
110 Vdc
230 Vac
110 Vac
230 Vac
24 Vdc
24 Vdc
230 Vac
24 Vdc

Web Resources

littelfuse.com/m4500
littelfuse.com/m4600
littelfuse.com/m4700

INPUT REFERENCE
+24 Vdc
+48 Vdc
+12 Vdc
0 Vdc
0 Vdc
0 Vdc
+24 Vdc
+48 Vdc
+12 Vdc
+110 Vdc
0 Vdc
0 Vdc
0 Vdc
+24 Vdc
+48 Vdc
+12 Vdc
+110 Vdc
0 Vdc
0 Vdc
0 Vdc
0 Vdc
+24 Vdc
+24 Vdc
0 Vdc
+24 Vdc
+24 Vdc
+24 Vdc
24 Vdc

ACCESSORIES

M0845.0010 Front cover for M4500
with handle IP54
M0845.0020 Front cover for M4500
with key IP54
M0846.0010 Front cover for M4600
with handle IP54
M0846.0020 Front cover for M4600
with key IP54
M0847.0010 Front cover for M4700/
M4780 with handle IP54
M0847.0020 Front cover for M4700/
M4780 with key IP54

*With common alarm relay, siren relay and built-in siren.
†Inverted reference. With common alarm relay, siren relay and built-in siren.
‡ Modbus Indicator Panel, 20 channels, 24 Vdc, common alarm relay and built in siren.

8

Features/Benefits

Specifications

The HMI operator panel is a touch-screen
solution for SCADA solutions, designed for
applications like engine control and supervision
systems, power management systems and
alarm systems. They can be integrated with
products such as the M2500, Engine Controller,
Generator Controllers and Alarm Panels.

Dimensions 	
M4000: H 219 mm (8.6”)
	
W 154 mm (6.0”) D 6 mm (0.2”)
	M4100: H 301 mm (11.9”)
	
W 228 mm (9.0”) D 6 mm (0.2”)
	M4200: H 398 mm (15.7”)
	
W 304 mm (12.0”) D 6 mm (0.2”)

•	 Clear, high-resolution screen provides high
level of details

Web Resources

ORDERING NUMBER
H4000.0010
H4000.0020
H4100.0010
H4100.0020
H4200.0010
H4200.0020
H4900.0010

© 2014 Littelfuse POWR-GARD® Products Catalog

littelfuse.com/h4000

DESCRIPTION
HMI Panel 6,5”
HMI Panel 6,5”, sun readable
HMI Panel 10,4”
HMI Panel 10,4” sun readable
HMI Panel 15,1”
HMI Panel 15,1” sun readable
Programming Software

169

littelfuse.com

Protection Relays & Controls

H4000 HMI Operator Panels

Protection Relays & Controls

CUSTOM-ENGINEERED ELECTRICAL EQUIPMENT
Electrical Modular Building/E-Houses
Description
Littelfuse Startco offers fully integrated electrical and automation systems.
Our products include prefabricated, modular, skid-mounted enclosures for
switchgear and auxiliary equipment. We deliver self-contained units, which
are completely coordinated, assembled and tested inside our controlled
factory environment. The primary switchgear and control applications
include low- and/or medium-voltage switchgear and motor control centre
enclosures; relay panel enclosures; and RTU and SCADA enclosures.

Modular Variable-Frequency Drives (VFDs)
Description
Variable-frequency drives have been used in a variety of industries for
years to start motors, optimize load control, and achieve energy savings.
Unfortunately, the mining industry has not been able to fully realize these
benefits as the combination of the electronics used in VFD’s and the dirty
or harsh environments found in underground and open-pit mining tends
to decrease the drive’s reliability and expected life. Littelfuse Startco has
solved this problem by designing a low-maintenance modular system that
keeps the critical components of the VFD isolated from the harsh mining
conditions, yet meets the thermal cooling requirements of the VFD.

SEL-PTO Custom Electrical Panels
Description
Littelfuse Startco is the leading Canadian manufacturer of custom-built
electrical equipment for mining and oil & gas. Ground-fault panels, also
known as power-take-off or starter panels, are a convenient means of
protecting and isolating trailing-cable-fed or hard-wired equipment such as
pumps, jumbos, drills, and electric machines. Littelfuse Startco Custom
Panels are metal-enclosed, rugged, high-quality, and are intended for use
in non-hazardous resistance-grounded systems. Littelfuse Startco has
earned a reputation for prompt delivery of Custom Panels.

Protection Relays & Controls

8

The Littelfuse Startco custom-products engineering team will assist with
your design. All designs are reviewed by engineers prior to quoting.

Underground Portable Power Centres
Description
Littelfuse Startco is the leading Canadian manufacturer of custom-built,
portable mine power centres up to 38-kV. Littelfuse Startco portable mine
power centres are skid-mounted, metal enclosed, and typically consist of
the following:
•	 Primary medium-voltage section, with fused load-break switch or
visible disconnect.
•	 Dry-type mine-duty power transformer.
•	 Primary and secondary power-distribution circuit breakers.
•	 Control and protection specific to the application.
•	 The Littelfuse Startco custom-products engineering team will assist
with your design. All designs are reviewed by engineers prior to quoting.
littelfuse.com

170

© 2014 Littelfuse POWR-GARD® Products Catalog

Protection Relays & Controls

PANEL MOUNT ADAPTERS • SOFTWARE • ACCESSORIES
Adapter Plates

Panel Mount Adapters
Features/Benefits
•	 Add communications capability to
older switchgear and improve
system performance
•	 Save cost by not calibrating older
electromechanical devices
•	 Conformally coated circuit boards
•	 Additional protective functions,
including reduced overcurrent and
dynamic thermal model

RELAY TO REPLACE

PANEL MOUNT

NEW RELAY

AB BULLETIN 1406
FPL-GFRM
FPL-GFRM
GE S1 GE S1
GE S1
GE LODTRAK III

PMA-14
PMA-6
PMA-6
PMA-9
PMA-9
PMA-10
PMA-13
PMA-16
PMA-16
PMA-24
PMA-15
PMA-15
PMA-3
PMA-3
PMA-12
Contact Factory
Contact Factory

MPS
SE-704
SE-701
MPU-32
FPU-32
MPU-32
MPS
MPU-32
FPU-32
MPS
MPU-32
FPU-32
SE-704
SE-701
MPU-32
FPU-32
FPU-32

GE MULTILIN 169, 269, OR 369
GE MULTILIN 469
GE MULTILIN P4A
GE MULTILIN P4A
GEC/MCGG
GEC/MCGG
GE & WESTINGHOUSE FT-11
P&B GOLDS
WESTINGHOUSE CO9 & CO11

•	 Minimal change-out time by using
existing CTs
•	 PGR-6200 and PGR-6300 can use
existing RTDs with an optional
RTD module
•	 Ability to match existing
overcurrent curves

Software
Product

SE-COMM-RIS

Relay Interface Software

VMPU

Virtual Motor
Protection Relay

VMPS

Virtual Motor
Protection System

VFPU

Software For
MPU-32
MPS
FPU-32
FPS

SE-FLASH

Firmware Update Utility

SE-MON330

MPU-32

Relay Interface Software

MPU-32 Tutorial

MPS

Virtual Feeder
Protection Relay

FPU-32

PGW-6150

PGR-6150

Relay Interface Software

Product

PGR-6200 Online
Self-Training Tutorial

H4900

Programming Software

PGW-8800

Relay Interface Software

Software For
MPU-32
MPS
FPU-32
FPS

SE-330
SE-330HV
SE-330AU
MPU-32
H4000
H4100
H4200
PGR-8800

8

Accessories
PRODUCT

PRODUCT

Current Transformers

Remote Indication
and Meters

Ground Reference Modules

Sensing Resistors

High Tension Couplers

Terminations and Adapters

Protection Relay Testers

Accessories for Controls and Diagnostics

Input Modules

DIN Mount Adapters

© 2014 Littelfuse POWR-GARD® Products Catalog

171

Protection Relays & Controls

Most protective relays require an accessory for operation. Visit littelfuse.com/relayscontrols for a complete listing.

littelfuse.com

Section Overview
System overvoltage is a growing concern in the electrical industry.
Component miniaturization has resulted in increased sensitivity
to many devices. The majority of these devices are unable to
handle high currents that result from Electrostatic Discharge (ESD)
and other voltage transients. Littelfuse® offers a broad range of
overvoltage protection to safeguard against these conditions.

SUPPRESSION PRODUCTS
Table of Contents
Industrial Varistor Products.........................................................173
LVSP Series Surge Suppression Fuses......................................175
BVSP Series Surge Protection Device........................................176

littelfuse.com

172

© 2014 Littelfuse POWR-GARD® Products Catalog

Suppression Products

OVERVOLTAGE SUPPRESSION PRODUCTS
Varistors, Surge Fuses and Varistor Assemblies

What Are Transients?

Overvoltage Applications

Transients are short duration surges of electrical energy that
result from the sudden release of previously stored energy.
In terms of electrical and electronic circuits, this energy can
be released through intentional, controlled switching action,
or induced into a circuit from external sources. If the
voltage magnitude of the transient is large enough, circuit
component damage or malfunction of the circuit may result.

•	 Industrial, High Energy AC Products such as Solenoids,
Motor Drives and Robotics
•	 Telecommunications Products
•	 UPS, AC Panels, Power Supplies, Circuit Breakers
(TVSS Products)
•	 Portable and Automotive Electronic Equipment

Lightning Induced Transients

Transient Sources and Magnitude
VOLTAGE

CURRENT

RISE-TIME

Transients induced by lightning are not the result of a direct
strike. When a lightning strike occurs, the event creates
a magnetic field which can induce transients of large
magnitude in nearby electrical cables.

DURATION

Lightning

25 kV

20 kA

10 µs

50 ms

Switching

600 V

500 A

50 µs

500 ms

EMP

300 kV

10 A

20 ns

1 ms

ESD

15 kV

30 A

1-5 ns

100 ns

Technological Solutions for
Transient Threats

Transient Voltage Scenarios

Because of the various types of transients and applications,
it is necessary to employ protection devices with different
characteristics in different applications. Littelfuse offers the
broadest range of circuit protection technologies.

The switching of inductive loads generates high energy
transients that increase in magnitude with increasingly
heavy loads. When the inductive load is switched off, the
collapsing magnetic field is converted into electrical energy,
which takes the form of a double exponential transient.
Depending on the source, these transients can be as large
as hundreds of volts and hundreds of amps with duration
times of 400 milliseconds.

Overvoltage Protection Portfolio Includes:

Discrete TVS Diode
This Silicon Avalanche Diode Technology is available in
surface mount and axial leaded packages. It offers protection
from medium to very high energy transients and can be
used in wide range of applications.

These examples are extremely common in electrical and
electronic systems. Because the sizes of the loads vary
according to the application, the wave shape, duration,
peak current, and peak voltage are all variables which
exist in real world transients. Once these variables
can be approximated, a suitable suppressor technology
can be selected.

173

littelfuse.com

Suppression Products

A ceramic technology that offers medium to very high
energy ratings for a wide range of applications. Available in
screw terminal, radial, square and axial leaded connections.

Typical sources of inductive transients are:
• Generators	
• Motors
• Relays		
• Transformers

© 2014 Littelfuse POWR-GARD® Products Catalog

9

MOVs (Metal Oxide Varistors)

Suppression Products

OVERVOLTAGE SUPPRESSION PRODUCTS
Varistors, Surge Fuses and Varistor Assemblies
Radial Leaded MOV

6000-10,000

35-480

TMOV®
25S

115-750

—

20,000

170-670

UltraMOVTM

130-625

170-825

1750-10,000

12.5-720

Radial
Leaded

-55 to +85°C
UltraMOVTM 25S

115-750

C-III

130-660

LA

130-1000

ZA

4-460

150-970

22,000

230-890

3500-9000

40-530

175-1200

1200-6500

11-360

5.5-615

50-6500

0.1-52

14, 20, 34 mm •

•

•

•

LEAD FREE

—

DISC SIZE

ROHS

115-750

AGENCY

MOUNT/
FORM
FACTOR

VDE

TMOV®/iTMOV®

OPERATING
TEMPERATURE
RANGE

CECC

PEAK
ENERGY
RANGE3

UL

PEAK
CURRENT
RANGE2 (A)

CSA

OPERATING OPERATING
AC VOLTAGE DC VOLTAGE
RANGE
RANGE

•

•

•

•

25 mm

•

SERIES
NAME1

7, 10, 14, 20,
25 mm

•

•

•

•

•

•

25 mm

•

•

•

•

•

•

10, 14, 20 mm •
7, 10, 14,
•
20 mm
5, 7, 10, 14,
•
20 mm

•

•

•

•

•

•

•

•

•

•

•

•

•

Suppression Products

9

PEAK
CURRENT
RANGE2 (A)

PEAK
ENERGY
RANGE3

BA/BB

130-2800

175-3500

50,000
70,000

450-10,000

DA/DB

130-750

175-970

40,000

270-1050

HA

130-750

175-970

25,000
40,000

200-1050

TMOV34S®

115-750

—

40,000

235-1050

HB34,
HG34, HF34

130-750

175-970

40,000

270-1050

DHB34

250-2800

330-3500

20,000
70,000

330-10,000

CA

250-2800

330-3500

20,000
70,000

330-10,000

OPERATING
TEMPERATURE
RANGE

MOUNT/
FORM
FACTOR
Screw /
Clip
Terminals

-55 to +85°C

Industrial
Packaged
Radial Leads

Bare Disc

AGENCY

DISC SIZE

LEAD FREE

OPERATING
DC VOLTAGE
RANGE

CSA

OPERATING
AC VOLTAGE
RANGE

UL

SERIES
NAME1

ROHS

Industrial High Energy Terminal MOV

60 mm

•

•

40 mm

•

• •

32, 40 mm

•

34 mm

•

34 mm

•

•

• •
• •

•

• •

34 mm

•

60 mm

•

High Power TVS Diodes
SERIES
NAME1

PACKAGE
TYPE

REVERSE STANDOFF
VOLTAGE (VR)

PEAK PULSE
POWER RANGE
1
(PPP)

PEAK PULSE
CURRENT
(IPP 8x20µs)

15KPA

P600

17-280

15,000 W

20KPA

P600

20.0-300

20,000 W

30KPA

P600

28.0-288

30,000 W

AK6

Radial Lead

58-430

NA

6,000 A

AK10

Radial Lead

58-430

NA

10,000 A

Not Applicable

OPERATING
TEMPERATURE

-85° to +302° F
(-55° to +175° C)

-67° to +347° F
(-55° to +150° C)

HALOGEN
FREE

ROHS
COMPLIANT

•

•

•

•

•

•

•

•

•

•

1. Detailed information about most product series listed here can be found on littelfuse.com/varistor
2. Not an applicable parameter for Crowbar devices
3. Value shown in Joules

littelfuse.com

174

© 2014 Littelfuse POWR-GARD® Products Catalog

Suppression Products

LVSP SURGE SUPPRESSION FUSE
600 Vac • 5-100 kA
Specifications
Voltage Rating	
Interrupting Rating	
Ratings	
Approvals	
Environmental	

600 Vac
200 kA
5 – 100 kA 8 x 20 µs surge withstand
UL Recognized (File: E71611)
RoHs Compliant

Electrical Specifications

Description
The Littelfuse® Varistor Protection (LVSP) Fuses are intended
for the protection of TVSS products. The LVSP series has
been designed to survive the 8 x 20 µs lightning surges
described in various standards (UL 1449, IEC 61000-4-5
and IEEE C62.41) without opening. This allows the TVSS to
perform the necessary suppression. The LVSP is not rated
for continuous current and the ratings are specific 8 x 20 µs
surge capability. The LVSP series can be used to facilitate
TVSS module compliance to UL 1449 in permanently
connected applications (abnormal overvoltage, unlimited
current conditions).

CATALOG
NUMBER

8 X 20 µS
SURGE
RATING

NOMINAL
MELTING I2T
(A2S)

LVSP5
LVSP10
LVSP15
LVSP20
LVSP30
LVSP40
LVSP60
LVSP80
LVSP100

5,000
10,000
15,000
20,000
30,000
40,000
60,000
80,000
100,000

359
1,300
3,267
4,940
11,950
20,550
39,240
75,000

NOMINAL
Ipeak@100 kA
CLEARING I2T
60 HZ (A)
(A2S)
981
3,210
6,235
11,710
35,325
61,700
145,555
254,000
Contact Factory

3,700
5,823
7,765
8,135
12,478
15,250
19,604
24,600

Ordering Information
SURGE
RATING

CATALOG/ORDERING NUMBER

5
10
15
20
30
40
60
80
100

Features/Benefits
•	 Very current limiting under AC short-circuit conditions
•	 Available in multiple mounting configurations
(cartridge, bolt-in, PC board mount)
•	 Provides short circuit protection in TVSS systems and
complements the Littelfuse line of overvoltage products
(HA, HB34, TMOV® and iTMOV® varistors as well
as the AK-10 series TVS diodes)

CARTRIDGE
LVSP52
LVSP102
LVSP152
LVSP202
LVSP302
LVSP402
LVSP60-2
LVSP802
–

LEADED

LVSP0005TX2
LVSP0010TX2
LVSP0015TX2
LVSP0020TX2
LVSP0030TX2
LVSP0040TX2
LVSP0060TX2
LVSP0080TX2
–

LVSP5R
LVSP10R
LVSP15R
LVSP20R
–
–
–
–
–

LVSP0005TXR
LVSP0010TXR
LVSP0015TXR
LVSP0020TXR
–
–
–
–
–

BOLT-IN
–
–
–
–
–
–
–
–
LVSP30 LVSP0030T
LVSP40 LVSP0040T
LVSP60 LVSP0060T
LVSP80 LVSP0080T
LVSP100-L LVSP0100VXL

Dimensions Inches (mm)
Cartridge 5-20 A

Leaded 5-20 A

.410
(10.41)

.410
(10.41)

1.53
(38.86)

1.5
(38.1)

•	 TVSS products
•	 Surge arrestors

.812
(20.62)

.328
(8.33)

.328
(8.33)

Applications

Cartridge 30-80 A

2.25
(57.15)

9

Recommended Fuse Blocks
Bolt-In 30-80 A

Suppression Products

LVSP (5-20)-2
L60030M (open block).................................................... 101
LFPSM (dead front)........................................................ 110

3.04
(77.21)
2.25
(57.15)

LVSP (30-80)-2
LFJ60030 (open block).................................................... 85
LFPSJ30 (dead front)...................................................... 111

.816
(20.73)

Bolt-In 100 A

LVSP (100)
LFJ60100 (open block)..................................................... 85

4.62
(117.35)

Web Resources

3.62
(91.95)

2.62
(66.55)

Download other technical information:
littelfuse.com/lvsp
© 2014 Littelfuse POWR-GARD® Products Catalog

175

littelfuse.com

Suppression Products

BVSP SERIES SURGE PROTECTION DEVICE
600 Vac • 10 kA

Specifications
Voltage Rating	
Interrupting Rating	
Ratings	

600 Vac
200 kA
10 kA 8 x 20 µs surge withstand

Ordering Information
SERIES

8 X 20 µS
PACKAGE MOUNTING
SURGE
QUANTITY METHOD
RATING (A)

CATALOG
NUMBER

ORDERING
NUMBER

BVSP

10,000

10

Ferrule

BVSP10-2

BVSP0010TX2

BVSP

10,000

10

PCB Tabs

BVSP10-R

BVSP0010TXR

Electrical Specifications

Description
The Littelfuse BVSP surge protection device (SPD) is
intended for the protection of transient voltage surge
suppressions (TVSS) systems. The BVSP series has been
designed to survive the 8 x 20 µs lightning surges described
in various standards (UL 1449, IEC 61000-4-5 and IEEE
C62.41) without opening. This allows the TVSS to perform
the necessary suppression. The BVSP is not rated for
continuous current and the ratings are specific 8 x 20 µs
surge capability. The BVSP series can be used to facilitate
TVSS module compliance to UL 1449 in permanently
connected applications (abnormal overvoltage, unlimited
current conditions).
®

CATALOG
NUMBER

8 X 20 µS
SURGE
RATING (A)

NOMINAL
MELTING I2T
(A2S)

NOMINAL
CLEARING I2T
(A2S)

Ipeak @ 200 kA
60 HZ (A)

BVSP10-2

10,000

1,580

9,960

8,160

BVSP10-R

10,000

1,580

9,960

8,160

Dimensions Inches (mm)
Ferrule Version

Suppression Products

.410
(10.41)

.410
(10.41)

Features/Benefits

9

PCB Version

•	 Very current limiting under AC short-circuit conditions
•	 Available in ferrule and printed circuit board (PCB)
configurations
•	 Provides short circuit protection in TVSS systems and
complements the Littelfuse line of overvoltage products
(HA, HB34, TMOV® and iTMOV® varistors as well
as the AK-10 series TVS diodes)

.328
(8.33)

.328
(8.33)

1.5
(38.1)

1.53
(38.86)

Applications
•	 TVSS products
•	 Surge arrestors

Recommended Fuse Holders
L60030M (open block).................................................... 101
LFPSM (dead front)........................................................ 110

littelfuse.com

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Section Overview
Miscellaneous Accessories include custom-built solutions designed
specifically to meet code requirements, fuse reducers, box cover units
and an assortment of useful fuse and holder accessories.

MISCELLANEOUS PRODUCTS
Table of Contents
Fuse Reducers.....................................................................................178
Box Cover Units...................................................................................179
Fuse Replacement & Custom Kits.....................................................180
Electronic Fuse Display & Spare Fuse Cabinet..................................181

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Miscellaneous Accessories

FUSE REDUCERS

Ordering Information

Description

250 Volt

Littelfuse® fuse reducers allow smaller size fuses to be
installed into existing fuse clips to prevent overfusing.

CATALOG / ORDERING NUMBER
CLASS H/K5
CLASS R

FUSE CLIP

FUSE
CASE SIZE

LRU 263

LRU 263 R

60 A

30 A

LRU 213

LRU 213 R

100 A

30 A

LRU 216

LRU 216 R

100 A

60 A

LRU 226

LRU 226 R

200 A

60 A

LRU 2621

LRU 2621 R

200 A

100 A

LRU 2641

LRU 2641 R

400 A

100 A

LRU 2642

LRU 2642 R

400 A

200 A

LRU 2661

LRU 2661 R

600 A

100 A

LRU 2662

LRU 2662 R

600 A

200 A

LRU 2664

LRU 2664 R*

600 A

400 A

Features/Benefits
•	 Simple installation
•	 Reduces inventory requirements
•	 Silver brazed joints for maximum strength
•	 UL Listed (File: E136855)
•	 CSA Certified (File: LR92899)

Web Resources
Download technical information: littelfuse.com/lruh
littelfuse.com/lrur
littelfuse.com/lruj

*Only one reducer required.

Dimensions

Refer to the fuse section of this catalog for fuse dimensions.

600 Volt
CATALOG / ORDERING NUMBER
CLASS H/K5 CLASS R
CLASS J

Accessories

10

FUSE CLIP

FUSE
CASE SIZE

Recommended Fuses
Class H/K5 Fuse Reducers

LRU 663

LRU 663 R

LRUJ63

60 A

30 A

LRU 216

LRU 216 R

LRUJ13

100 A

30 A

NLN / NLS............................................................................20

LRU 616

LRU 616 R

LRUJ16¶

100 A

60 A

Class R Fuse Reducers

LRU 626

LRU 626 R

LRUJ26

200 A

60 A

LRU 2621

LRU 2621 R

LRUJ21

200 A

100 A

LRU 2641

LRU 2641 R

LRUJ41

400 A

100 A

LRU 2642

LRU 2642 R

LRUJ42

400 A

200 A

LRU 2661

LRU 2661 R

—

600 A

100 A

LRU 2662

LRU 2662 R

—

600 A

200 A

FLNR / FLSR........................................................................ 17
FLNR_ID / FLSR_ID............................................................. 17
IDSR.................................................................................... 16
LLNRK / LLSRK.................................................................... 13
LLSRK_ID............................................................................ 13
KLNR / KLSR........................................................................ 15

LRU 2664

LRU 2664 R†

LRUJ64

600 A

400 A

Class J Fuse Reducers

†Only one reducer required.
¶Fuse and reducer com­bi­na­tion is slightly larger in diameter than 100 A Class J fuses. For
specific ap­pli­ca­tions, contact factory.
Class J reducers cannot be used in bolt-on applications.

littelfuse.com

JTD_ID / JTD...............................................................................21
JLS...............................................................................................22

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Miscellaneous Accessories

BOX COVER UNITS

Description
Provide eco­nom­i­cal method of protecting small motors
against overcurrent damage.

Applications
•	 Edison-Base plug fuses (TOO, TLO)
•	 Type S plug fuses (SOO, SLO) with adapters (SAO)

Specifications
Voltage Rating	
125 V
Max Ampere Rating	 15 A
Approvals	
UL Listed parts
	

Web Resources
Additional technical information available at:
littelfuse.com/boxcover

FIGURE
LITTELFUSE
NUMBER PART NUMBER

1

2

BOX COVER FEATURES
EDISON BASE GROUNDING
FUSE HOLDER RECEPTACLE

SINGLE POLE
SWITCH

TWO POLE
SWITCH

PILOT
LIGHT

TO BE
MOUNTED ON

LSOU

1

—

—

—

—

2-1⁄4" Handy Box

LSOW

1

—

—

—

—

2-3⁄4” Switch Box

LSOX

1

—

—

—

—

4" Octagon Box

LSOY

1

—

—

—

—

4" Square Box

LSRU*

1

1

—

—

—

2-1⁄4" Handy Box

LSRW

1

1

—

—

—

2-3⁄4” Switch Box
4" Octagon Box

LSRX

1

1

—

—

—

LSRY

1

1

—

—

—

4" Square Box

LSSU*

1

—

1

—

—

2-1⁄4" Handy Box

1

—

1

—

—

2-3⁄4" Switch Box

1

—

1

—

—

4" Octagon Box

LSSY*

1

—

1

—

—

4" Square Box

4

LSOY-B

2

—

—

—

—

4" Square Box

5

LSSY-L

1

—

1

—

1

4" Square Box

6

LSSY-RL

1

1

1

—

1

4" Square Box

7

LSCY

2

—

2

—

—

4" Square Box

8

LSKA

2

1 (250V)

—

—

—

4-1⁄16" Square Box

9

LSTY

2

—

—

1

—

4" Square Box

*UL Listed (File: E308725)

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10
Accessories

LSSW
LSSX

3

Miscellaneous Accessories

FRCK SERIES FUSE REPLACEMENT & CUSTOM KITS

Description

Features/Benefits

Fuse Replacement and Custom Kits help reduce downtime
by providing mobile storage and organization for replacement
fuses. The FRCK Series provides a custom solution that can
be filled with multiple fuse series that are more common or
specific to your needs or application.

nn Custom sized compartments fit various fuse series
nn Large kit features a convenient handle for carrying
nn Kits are sold empty for complete customization
nn Each kit comes with a blank label on the inside cover
so users can write in part numbers or use bar code
labels to help with refills.



Web Resources
Additional information: littelfuse.com/kits

Ordering Information
KIT SIZE

DIMENSIONS
L X W X H (INCHES)

DESCRIPTION

CATALOG NUMBER

Large

16.00 x 12.00 x 10.00

Mobile organizer with 2 small and 3 medium drawers;
Unique FRACK Label for Oil & Gas

FRCK-OG

Large

16.00 x 12.00 x 10.00

Mobile organizer with 2 small and 3 medium drawers

FRCK-LG

Medium

14.00 x 9.13 x 2.00

14” organizer with adjustable dividers

FRCK-MD

Small

8.25 x 4.25 x 1.00

8” organizer with up to 6 compartments

FRCK-SM

Accessories

10

FRCK-OG & FRCK-LG
littelfuse.com

FRCK-MD
180

FRCK-SM
© 2014 Littelfuse POWR-GARD® Products Catalog

Miscellaneous Accessories

FUSE DISPLAYS AND CABINETS
Electronic Fuse Display
Fully stocked rack includes the following parts
3AG (GLASS)
FAST ACTING FUSES
CATALOG
QUANTITY
NUMBER
25

312 1⁄ 2 A

25

313 1⁄ 2 A

50

312 1A

25

313 3⁄ 4 A

25

312 1 1⁄ 2 A

25

313 1A

75

312 2A

25

313 1 1⁄ 2 A

25
75

Description
This wall-mountable or free-standing modular rack system
prominently displays Littelfuse glass and automotive fuses.
Additional sections can be quickly snapped on for a larger
product selection. Each rack features a cross reference
guide to help customers locate the proper replacement fuse.

3AG (GLASS)
SLO-BLO® FUSES
CATALOG
QUAN­TI­TY
NUMBER

312

2 1⁄ 2 A

312 3A

50

313 2A

25

313 2 1⁄ 2 A

25

312 4A

25

313 3A

25

312 5A

25

313 4A

25

312 10A

25

313 5A

3AB (CERAMIC)
NORMAL-BLO FUSES

Features/Benefits
•	 Holds 720 (144 5-packs) of the most popular glass,
ceramic, and automotive fuses
•	 Designed to save space—measures 14" H × 9" W × 4" D
Suitable for wall or counter mounting

3AB (CERAMIC)
SLO-BLO® FUSES

QUAN­TI­TY

CATALOG
NUMBER

QUAN­TI­TY

CATALOG
NUMBER

25

314 15A

25

326 8A

25

314 20A

20

326 10A

25

314 30A

—

—

Ordering Information

•	 Includes cross reference, product identification
guide, and back-up card for easy reordering
•	 Expandable with modular section that can hold
240 fuses (48 5-packs) per section

TYPE

CATALOG NUMBER

ORDERING NUMBER

Fully Stocked Display

094324PG

00940324ZXPG

Empty Display Rack

FDR001PG

0FDR0001ZXPG

Additional Sections

MRS001PG

0MRS0001ZXPG

Description

Spare Fuse Cabinet

•	 Steel cabinet with piano hinges that can be locked
to prevent un­au­tho­rized access. Weather stripped to
reduce the ac­cu­mu­la­tion of dust, dirt and moisture
•	 Con­ve­nient inventory card located inside door.
Measures 30" H × 24"  W × 12" D. Keyhole mounting
holes 16" on center for easy installation

Ordering Information
CATALOG NUMBER

ORDERING NUMBER

Spare Fuse Cabinet

LSFC

LSFC

Spare Keys

LKEY001

LKEY0001Z

Web Resources
Additional information: littelfuse.com/lsfc

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10
Accessories

TYPE

Section Overview
This Technical Application Guide or ‘Fuseology’ section provides the
information needed to select the correct types of Littelfuse POWR-GARD®
fuses for most applications. If there are any questions or if additional
data is needed for a specific use, call the Littelfuse Technical Support
and Engineering Service Group at 1-800-TEC-FUSE (1-800-832-3873),
email them at techline@littelfuse.com or visit us at littelfuse.com.

TECHNICAL APPLICATION GUIDE
Table of Contents
Fuseology Fundamentals.............................................................183
Selection Considerations.............................................................184
Time-current Curves and Peak Let-through Charts......................189
Selective Coordination.................................................................191
UL/CSA Fuse Classes and Applications.......................................194

Technical Information
White papers, and a library
of technical information is
available online at
littelfuse.com/technicalcenter

Terms and Definitions..................................................................196
Motor Protection Tables.............................................................. 203
Alphanumeric Index of Catalog Numbers................................... 206
Condensed Fuse Cross Reference............................................. 208

littelfuse.com

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© 2014 Littelfuse POWR-GARD® Products Catalog

Technical Application Guide

FUSEOLOGY FUNDAMENTALS

I. OVERCURRENT PROTECTION
FUNDAMENTALS
(FUSES AND HOW THEY WORK)
Introduction

3.	 Minimizes overcurrent damage to property, equipment,
and electrical systems.
4.	 Provides coordinated protection. Only the protective
device immediately on the line side of an overcurrent
opens to protect the system and minimize unnecessary
downtime.

An important part of developing quality overcurrent protection
is an understanding of system needs and overcurrent
protective device fundamentals. This section discusses these
topics with special attention to the application of fuses. If you
have additional questions, call our Technical Support Group at
1-800-TEC-FUSE (1-800-832-3873). Definitions of terms used
in this section are located towards the end of this Technical
Application Guide.

5.	 Is cost effective while providing reserve interrupting
capacity for future growth.
6.	 Consists of equipment and components not subject to
obsolescence and requiring only minimum maintenance
that can be performed by regular maintenance personnel
using readily available tools and equipment.

Overcurrent Types and Effects

Why Overcurrent Protection?

An overcurrent is any current that exceeds the ampere rating of
conductors, equipment, or devices under conditions of use. The
term “overcurrent” includes both overloads and short-circuits.

All electrical systems eventually experience overcurrents.
Unless removed in time, even moderate overcurrents
quickly overheat system components, damaging insulation,
conductors, and equipment. Large overcurrents may melt
conductors and vaporize insulation. Very high currents
produce magnetic forces that bend and twist bus bars.
These high currents can pull cables from their terminals and
crack insulators and spacers.

Overloads
An overload is an overcurrent confined to normal current
paths in which there is no insulation breakdown.
Sustained overloads are commonly caused by installing
excessive equipment such as additional lighting fixtures
or too many motors. Sustained overloads are also caused
by overloading mechanical equipment and by equipment
breakdown such as failed bearings. If not disconnected
within established time limits, sustained overloads
eventually overheat circuit components causing thermal
damage to insulation and other system components.

Too frequently, fires, explosions, poisonous fumes and
panic accompany uncontrolled overcurrents. This not only
damages electrical systems and equipment, but may cause
injury or death to personnel nearby.
To reduce these hazards, the National Electrical Code®
(NEC®), OSHA regulations, and other applicable design and
installation standards require overcurrent protection that will
disconnect overloaded or faulted equipment.

Overcurrent protective devices must disconnect circuits and
equipment experiencing continuous or sustained overloads
before overheating occurs. Even moderate insulation
overheating can seriously reduce the life of the components
and/or equipment involved. For example, motors overloaded
by just 15% may experience less than 50% of normal
insulation life.

Industry and governmental organizations have developed
performance standards for overcurrent devices and testing
procedures that show compliance with the standards and
with the NEC. These organizations include: the American
National Standards Institute (ANSI), National Electrical
Manufacturers Association (NEMA), and the National
Fire Protection Association (NFPA), all of which work in
conjunction with Nationally Recognized Testing Laboratories
(NRTL) such as Underwriters Laboratories (UL).

Temporary overloads occur frequently. Common causes
include temporary equipment overloads such as a machine
tool taking too deep of a cut, or simply the starting of an
inductive load such as a motor. Since temporary overloads
are by definition harmless, overcurrent protective devices
should not open or clear the circuit.

Electrical systems must meet applicable code requirements
including those for overcurrent protection before electric
utilities are allowed to provide electric power to a facility.

What is Quality Overcurrent Protection?
A system with quality overcurrent protection has the
following characteristics:
1.	 Meets all legal requirements, such as NEC , OSHA, local
codes, etc.
®

2.	 Provides maximum safety for personnel, exceeding
minimum code requirements as necessary.
© 2014 Littelfuse POWR-GARD® Products Catalog

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11
Technical

It is important to realize that fuses selected must have
sufficient time-delay to allow motors to start and temporary
overloads to subside. However, should the overcurrent
continue, fuses must then open before system components
are damaged. Littelfuse POWR-PRO® and POWR-GARD®
time-delay fuses are designed to meet these types of
protective needs. In general, time-delay fuses hold 500% of
the rated current for a minimum of ten seconds, yet will still
open quickly on higher values of current.

Technical Application Guide

FUSEOLOGY FUNDAMENTALS

temperature of 150°C. Any currents larger than this may
immediately vaporize organic insulations. Arcs at the point
of fault or from mechanical switching such as automatic
transfer switches or circuit breakers may ignite the vapors
causing violent explosions and electrical flash.

Even though government-mandated high-efficiency motors
and NEMA Design E motors have much higher locked rotor
currents, POWR-PRO® time-delay fuses such as the FLSR_
ID, LLSRK_ID, or IDSR series have sufficient time-delay to
permit motors to start when the fuses are properly selected
in accordance with the NEC®.

Magnetic stress (or force) is a function of the peak current
squared. Fault currents of 100,000 amperes can exert forces
of more than 7,000 lb. per foot of bus bar. Stresses of this
magnitude may damage insulation, pull conductors from
terminals, and stress equipment terminals sufficiently such
that significant damage occurs.

Short-Circuits
A short-circuit is an overcurrent flowing outside of its normal
path. Types of short-circuits are generally divided into
three categories: bolted faults, arcing faults, and ground
faults. Each type of short-circuit is defined in the Terms and
Definitions section.

Arcing at the point of fault melts and vaporizes all of the
conductors and components involved in the fault. The arcs
often burn through raceways and equipment enclosures,
showering the area with molten metal that quickly starts fires
and/or injures any personnel in the area. Additional short-circuits
are often created when vaporized material is deposited on
insulators and other surfaces. Sustained arcing-faults vaporize
organic insulation, and the vapors may explode or burn.

A short-circuit is caused by an insulation breakdown or
faulty connection. During a circuit’s normal operation, the
connected load determines current. When a short-circuit
occurs, the current bypasses the normal load and takes a
“shorter path,” hence the term ‘short-circuit’. Since there is
no load impedance, the only factor limiting current flow is
the total distribution system’s impedance from the utility’s
generators to the point of fault.

Whether the effects are heating, magnetic stress, and/or
arcing, the potential damage to electrical systems can be
significant as a result of short-circuits occurring.

A typical electrical system might have a normal load impedance
of 10 ohms. But in a single-phase situation, the same system
might have a load impedance of 0.005 ohms or less. In order
to compare the two scenarios, it is best to apply Ohm’s Law (I
= E/R for AC systems). A 480 volt single-phase circuit with the
10 ohm load impedance would draw 48 amperes (480/10 = 48).
If the same circuit has a 0.005 ohm system impedance when
the load is shorted, the available fault current would increase
significantly to 96,000 amperes (480/0.005 = 96,000).

II. SELECTION CONSIDERATIONS
Selection Considerations for Fuses (600 volts and below)
Since overcurrent protection is crucial to reliable electrical
system operation and safety, overcurrent device selection
and application should be carefully considered. When
selecting fuses, the following parameters or considerations
need to be evaluated:

As stated, short-circuits are currents that flow outside
of their normal path. Regardless of the magnitude of
overcurrent, the excessive current must be removed quickly.
If not removed promptly, the large currents associated
with short-circuits may have three profound effects on an
electrical system: heating, magnetic stress, and arcing.

•	
•	
•	
•	
•	
•	
•	

Heating occurs in every part of an electrical system when
current passes through the system. When overcurrents
are large enough, heating is practically instantaneous. The
energy in such overcurrents is measured in ampere-squared
seconds (I2t). An overcurrent of 10,000 amperes that lasts for
0.01 seconds has an I2t of 1,000,000 A2s. If the current could
be reduced from 10,000 amperes to 1,000 amperes for the
same period of time, the corresponding I2t would be reduced
to 10,000 A2s, or just one percent of the original value.

Technical

11

Current Rating
The current rating of a fuse is the AC or DC current,
expressed in amperes, which the fuse is capable of carrying
continuously under specified conditions. Fuses selected
for a circuit must have ampere ratings that meet NEC®
requirements, namely those found in NEC® Articles 240 and
430. These NEC® requirements establish maximum ratings
and in some cases, minimum ratings. When selecting a
fuse, it is generally recommended to select a current rating
as close as possible to the system’s normal running current.

If the current in a conductor increases 10 times, the I2t
increases 100 times. A current of only 7,500 amperes
can melt a #8 AWG copper wire in 0.1 second. Within
eight milliseconds (0.008 seconds or one-half cycle), a
current of 6,500 amperes can raise the temperature of #12
AWG THHN thermoplastic insulated copper wire from its
operating temperature of 75°C to its maximum short-circuit
littelfuse.com

Current Rating
Voltage Rating
Interrupting Rating
Type of Protection and Fuse Characteristics
Current Limitation
Physical Size
Indication

184

© 2014 Littelfuse POWR-GARD® Products Catalog

Technical Application Guide

SELECTION CONSIDERATIONS

Voltage Rating

The recommendation to standardize on fuses with at least
a 200,000 ampere interrupting rating (AIR) ensures that all
fuses have an adequate interrupting rating while providing
reserve interrupting capacity for future increases in available
fault current.

The voltage rating of a fuse is the maximum AC or DC
voltage at which the fuse is designed to operate. Fuse
voltage ratings must equal or exceed the circuit voltage
where the fuses will be installed, and fuses used in DC
circuits must be specifically rated for DC applications. In
terms of voltage, fuses may be rated for AC only, DC only, or
both AC and DC. However, exceeding the voltage ratings or
using an AC only fuse in a DC circuit could result in violent
destruction of the fuse.

300,000 AIR Fuses
Littelfuse POWR-PRO® fuse series have a Littelfuse SelfCertified interrupting rating of 300,000 amperes rms
symmetrical. The 300,000 ampere testing was performed
in a Nationally Recognized Testing Laboratory, and the tests
were UL witnessed. UL has ruled that fuses with a UL
interrupting rating greater than 200,000 amperes must be
marked as “Special Purpose Fuses” and may not be labeled
as UL Listed Class RK5, RK1, L, etc.

The standard 600 volt rated fuses discussed in this section
may be applied at any voltage less than or equal to their
rating. For example, a 600 volt fuse may be used in a 277
volt or even a 32 volt system, but not any system exceeding
600 volts.

Type of Protection and Fuse Characteristics

NOTE: This does not apply to semiconductor fuses and medium
voltage fuses. See the semiconductor and medium voltage fuse
application information on littelfuse.com for voltage limitations
of these fuses.

Time current characteristics determine how fast a fuse
responds to overcurrents. All fuses have inverse time
characteristics; that is, the fuse opening time decreases as
the magnitude of overcurrent increases. When properly rated
in accordance with NEC® requirements, fuses provide both
overload and short-circuit protection to system conductors
and components. However, in some instances such as when
fuses are used to backup circuit breakers or to provide motor
branch circuit short-circuit and ground fault protection, fuses
provide only short-circuit protection. A fuse’s response to
overcurrents is divided into short-circuits and overloads.

Interrupting Rating
The interrupting rating of a fuse is the highest available
symmetrical rms alternating current that the fuse is required
to safely interrupt at its rated voltage under standardized test
conditions. A fuse must interrupt all overcurrents up to its
interrupting rating without experiencing damage. Standard
UL fuses are available with interrupting ratings of 10,000 A,
50,000 A, 100,000 A, 200,000 A, and 300,000 A.

Short-Circuits

NEC® Article 110.9 requires that all equipment intended
to break current at fault levels have an interrupting rating
sufficient for the system voltage and current available at
the equipment’s line terminals. Refer to Figure 1. It is vitally
important to select fuses with interrupting ratings which
equal or exceed the available fault current.

A fuse’s short-circuit response is its opening time on highervalue currents. For power fuses, higher-value currents are
generally over 500-600% of the fuse’s current rating. As
stated earlier, all fuses have inverse time characteristics: the
higher the current, the faster the opening time. Since shortcircuits should be removed quickly, inverse time is especially
important for short-circuit protection.

Main Switchboard

Overloads

Available Fault
Current = 125,000A

While fuses must disconnect overloaded conductors and
equipment before the conductors and components are
seriously overheated, they should not disconnect harmless
temporary overloads. To provide sufficient overload
protection for system conductors, UL has established
maximum fuse opening times at 135% and 200% of a
fuse’s current rating. All UL Listed fuses for application in
accordance with the National Electrical Code® must meet
these limits whether they are fast-acting or time-delay fuses.

All fuses in main switchboard
must have an A.I.R. of at least
125,000A. Next higher standard
rating is 200,000A.

Available Fault
Current = 85,000A

Fuses in panel must have at
least an 85,000 A.I.C. Next higher
standard rating is 100,000A., but
best choice is time-delay fuses
with 200,000 A.I.R.

Figure 1 – Interrupting Rating Requirements per NEC
© 2014 Littelfuse POWR-GARD® Products Catalog

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11
Technical

As just stated, a fuse is designed to respond to two types
of overcurrents – short circuits and overloads. As a result,
selecting the proper fuse for a given application usually
involves deciding whether to use a time-delay fuse or a
fast-acting fuse. A more in-depth review of both possible
scenarios is important at this time.

Technical Application Guide

SELECTION CONSIDERATIONS

circuit protection, and often permits the use of smaller,
less expensive disconnect switches. Time-delay fuses
have gradually replaced most one-time (UL Class K5) and
renewable (UL Class H) fuses. Today, more than 50% of all
fuses sold by electrical distributors are time-delay fuses.

Fast-Acting (Normal-Opening) Fuses
Fast-acting fuses (sometimes called “Normal-opening”
fuses) have no intentional time-delay. Typical opening
times at 500% of the fuse ampere rating range from 0.05
second to approximately 2 seconds. Fast-Acting fuses
are suitable for non-inductive loads such as incandescent
lighting and general-purpose feeders, or branch circuits
with little or no motor load. When protecting motors and
other inductive loads, fast-acting fuses must be rated at
200-300% of load currents to prevent nuisance opening on
in-rush currents. Fuses with such increased ratings no longer
furnish adequate protection from overloads and only provide
short-circuit protection. Overload relays or other overload
protection devices must be provided to properly protect
conductors and equipment from overload conditions.

Dual Element Fuses
Littelfuse time-delay FLNR, FLNR_ID, FLSR, FLSR_ID, IDSR
(UL Class RK5), and LLNRK, LLSRK, LLSRK_ID (UL Class RK1),
and some JTD, JTD_ID (UL Class J) series fuses have true
dual-element construction meaning the fuse has an internal
construction consisting of separate short-circuit and overload
sections or elements. Time-delay elements are used for
overload protection, and separate fast acting fuse elements or
links are used to provide current-limiting short-circuit protection.

Very Fast-Acting Fuses

All fast-acting fuses provide fast short-circuit response
within their interrupting rating. Some are considered currentlimiting, such as UL Class T and Class J. Others are noncurrent-limiting, such as UL Class H.

This category of fuses exists for limited applications. The
principle use of very fast acting fuses is to protect solidstate electronic components, such as semiconductors. Fuse
series designated as ‘Semiconductor Fuses’ have special
characteristics including quick overload response, very
low I2t and Ipeak currents, and peak transient voltages, that
provide protection for components that cannot withstand
line surges, low value overloads, or short-circuit currents.
Very fast-acting fuses are designed for very fast response to
overloads and short-circuits, and are very current-limiting.

Time-Delay (SLO-BLO®) Fuses
Most UL Class CC, CD, G, J, L, RK5 and RK1 fuses, plus
some of the UL Listed Miscellaneous fuses are considered
time-delay. If so, they are identified as such on the fuse
label with the words “Time-Delay”, “T-D”, “D”, or some
other suitable marking. Minimum time-delay varies with
the fuse class, and to some degree with the fuse ampere
rating. UL standards for POWR-GARD® fuse series FLNR,
FLNR_ID, FLSR, FLSR_ID, IDSR (UL Class RK5), LLNRK,
LLSRK, LLSRK_ID (UL Class RK1), and JTD, JTD_ID (UL
Class J) require these fuses to carry 500% rated current for a
minimum of 10 seconds. Standards for CCMR and KLDR (UL
Class CC and CD) and SLC (UL Class G) fuses require them
to carry 200% rated current for a minimum of 12 seconds.

Effect of Ambient Temperature on Fuses
The current carrying capacity of fuses is 110% of the fuse
rating when installed in a standard UL test circuit and tested
in open air at 25°C ambient. This allows for derating to 100%
of rating in an enclosure at 40°C ambient.

Although there is no UL Classification for time-delay Class
L fuses, it is still permissible for them to be marked “TimeDelay.” The amount of time-delay is determined by the
manufacturer. Littelfuse KLPC series and KLLU series fuses
will hold 500% current for 10 seconds or more.
In addition to providing time-delay for surges and short time
overloads, time-delay fuses meet all UL requirements for
sustained overload protection. On higher values of current,
time-delay fuses are current-limiting; meaning they remove
large overcurrents in less than one-half cycle (0.00833
seconds). Time-delay fuses provide the best overall protection
for both motor and general purpose circuits, and eliminate
nuisance fuse opening and most situations of downtime.

Technical

11

20

A

0

B

0

B

20
40

A

Compared to fast-acting fuses, time-delay fuses can be
selected with ratings much closer to a circuit’s operating
current. For example, on most motor circuits Class RK5 and
RK1 fuses can be rated at 125-150% of a motor’s full load
current (FLA). This provides superior overload and shortlittelfuse.com

KEY TO CHART:
Curve A - Slo-Blo® Fuse
Curve B - Medium and Fast-Acting Fuses

40

-60°C
-76°F

-40°C
-40°F

-20°C
-4°F

0°C

32°F

20°C
68°F

40°C

104°F

60°C

140°F

80°C

176°F

100°C
212°F

120°C
248°F

60

PERCENT OF DOWNRATING

PERCENT OF UPRATING

FUSE RERATING CURVE
60

140°C
264°F

AMBIENT TEMPERATURE

Figure 2 – Fuse Rerating Curve

186

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Technical Application Guide

SELECTION CONSIDERATIONS

Current Limitation

Indication
The newest consideration for selecting the best fuse for a
given application is indication. Many of the more commonly
used UL fuse classes are now available in both indicating
and non-indicating versions. Built-in, blown-fuse indication
that quickly identifies which fuse or fuses within an electrical
panel or system have blown can be found on the Littelfuse
POWR-PRO® LLSRK_ID Class RK1, FLNR_ID, FLSR_ID and
IDSR Class RK5, and JTD_ID Class J fuse series.

A current-limiting fuse is one that opens and clears a fault
in less than 180 electrical degrees, or in other words, within
the first half electrical cycle (0.00833 seconds). See the
definition of Current-limiting Fuse and Figure 13 in the Terms
and Definitions section.
NEC® Article 240.2 states that a current-limiting overcurrent
protective device must reduce the peak let-through current to a
value substantially less than the potential peak current that would
have occurred if the fuse were not used in the circuit or were
replaced with solid conductors of the same impedance. The total
destructive heat energy (I2t) to the circuit and its components is
greatly minimized as a result of using current-limiting fuses.

The indicating feature on these fuses provides reduced
downtime, increased safety, and reduced housekeeping or
troubleshooting headaches and delays. Littelfuse Indicator®
fuses will help lower the costs associated with downtime,
provide longer fuse life by minimizing nuisance openings,
increase system performance by minimizing equipment
damage, and improve safety by minimizing accidents.

It is important to note that UL Class H ‘Renewable’ fuses
designed decades ago are considered non-current limiting. Other
than Midget fuses, almost all other fuse types used in today’s
electrical systems and applications are considered currentlimiting per the above parameters. This selection consideration
now involves determining the degree or level of current limitation
required to properly protect a given device or system.

III. GENERAL FUSING RECOMMENDATIONS
Based on the above selection considerations, the following
is recommended:

It is also important to point out that matching fuse holders
and/or fuse blocks must reject non-current-limiting fuses and
accept only current-limiting fuses of the stated UL Class.

Fuses with ampere ratings from 1/10 through 600 amperes
•	 When available fault currents are less than 100,000
amperes and when equipment does not require the more
current-limiting characteristics of UL Class RK1 fuses,
FLNR and FLSR_ID Series Class RK5 current-limiting fuses
provide superior time-delay and cycling characteristics at a
lower cost than RK1 fuses. If available fault currents exceed
100,000 amperes, equipment may need the additional
current-limitation capabilities of the LLNRK, LLSRK and
LLSRK_ID series Class RK1 fuses.

Physical Size
While often overlooked, the physical size or overall
dimensions of the fuse to be used in a given application is
another important selection consideration to evaluate. There
is a trend toward reduction of size in almost everything, and
electrical equipment is no exception. Fuse size is actually
determined by the size and dimensions of the fuse block or
disconnect switch in which it is installed.

•	 Fast-acting JLLN and JLLS series Class T fuses possess
space-saving features that make them especially suitable
for protection of molded case circuit breakers, meter
banks, and similar limited-space applications.

While saving space may be an important factor when
selecting the proper fuses, other considerations should not
be overlooked. Some of these include:

•	 Time-delay JTD_ID and JTD series Class J fuses are used
in OEM motor control center applications as well as other
MRO motor and transformer applications requiring spacesaving IEC Type 2 protection.

•	 Does the smallest fuse have the most desirable
characteristics for the application?
•	 Does the equipment in which the fuse will be installed
provide adequate space for maintenance?

•	 Class CC and Class CD series fuses are used in control
circuits and control panels where space is at a premium.
The Littelfuse POWR-PRO CCMR series fuses are best
used for protection of small motors, while the Littelfuse
KLDR series fuses provide optimal protection for control
power transformers and similar devices.

•	 Do smaller fuses coordinate well with the system’s other
overcurrent protection?
If looking at just physical dimensions, a 600 volt, 60 ampere,
200,000 AIR, time-delay, dual-element UL Class CD fuse is smaller
than a similarly rated UL Class J fuse, which is in turn, considerably
smaller than a similarly rated UL Class RK1 or Class RK5 fuse.
However, smaller-sized fuses can sometimes have less time-delay
or more nuisance openings than their larger counterparts, so it is
always important to consider all factors involved.

11
Technical

© 2014 Littelfuse POWR-GARD® Products Catalog

For questions about product applications, call our Technical
Support Group at 800-TEC-FUSE.

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Technical Application Guide

SELECTION CONSIDERATIONS

Fuses with ampere ratings from 601 through 6,000 amperes

•	 Screw – for use with spade lugs or ring terminals.

For superior protection of most general-purpose and motor
circuits, it is recommended to use the POWR-PRO® KLPC
series Class L fuses. The Class L fuses are the only timedelay fuse series available in these higher ampere ratings.

•	 Screw with Pressure Plate – for use with solid or
stranded wire without terminal and recommended for
applications where vibration will be a factor.
•	 Box Lug – the most durable of the three options and
used with all types of solid wire and Class B and Class C
stranded wire.

Information on all the Littelfuse fuse series referenced above
can be found on the UL/CSA Fuse Classes and Applications
Charts found later in this Technical Application Guide.

There are a few additional aspects to keep in mind when
selecting the fuse holder or fuse block needed for a given
application. UL Class H blocks accept Class H, Class K5, and
Class R fuses. Similarly, Midget-style fuse blocks accept
both Midget and UL Class CC fuses.

IV. SELECTION CONSIDERATIONS FOR
FUSE HOLDERS

Both UL Class R and Class CC fuse holders contain a
rejection feature which prevents the insertion of a different
Class or type of fuse. The physical size and dimensions of
UL Class J and Class T fuses accomplish the same thing in
preventing the insertion of a different Class of fuse as well.

Equally important to the selection of the proper fuse is the
correct selection of the proper fuse holder or fuse block for
a given application. Fuse holders are available using most
of the same Selection Considerations outlined above for UL
fuse classes. Considerations for fuse holders include:
•	 Current Rating
•	 Voltage Rating

V. CIRCUIT PROTECTION CHECKLIST

•	 Interrupting Rating

To select the proper overcurrent protective device for an
electrical system, circuit and system designers should ask
themselves the following questions before a system is
designed:

•	 Physical Size
•	 Indication
Additional selection considerations for fuse holders and fuse
blocks include:

•	 What is the normal or average current expected?
•	 What is the maximum continuous (three hours or more)
current expected?

•	 Number of poles

•	 What inrush or temporary surge currents can be
expected?

•	 Mounting configuration
•	 Connector type

•	 Are the overcurrent protective devices able to distinguish
between expected inrush and surge currents, and open
under sustained overloads and fault conditions?

Number of Poles
The number of poles for each set of fuses is determined by
the characteristics of the circuit. Most fuse block series are
available in 1, 2, or 3 pole configurations, although some are
also available with four or more poles. The option to gang
individual fuse blocks into longer strips will be determined
by the available space and type of wire being used.

•	 What kind of environmental extremes are possible? Dust,
humidity, temperature extremes and other factors need
to be considered.
•	 What is the maximum available fault current the
protective device may have to interrupt?
•	 Is the overcurrent protective device rated for the system
voltage?

Mounting Configuration

Technical

11

Depending on the fuse block design, another selection
consideration to evaluate is how the fuse block is mounted
or inserted into the panel. Historically, fuse blocks simply
screwed into the back of the panel, but many newer designs
have now added (or replaced the screw-in design with) a DIN
rail mounting capability. The DIN rail mounting feature allows
the blocks to be quickly installed and removed from the rails.

•	 Will the overcurrent protective device provide the safest
and most reliable protection for the specific equipment?
•	 Under short-circuit conditions, will the overcurrent
protective device minimize the possibility of a fire or
explosion?
•	 Does the overcurrent protective device meet all the
applicable safety standards and installation requirements?

Connector Type

Answers to these questions and other criteria will help to
determine the type overcurrent protection device to use for
optimum safety, reliability and performance.

For Littelfuse fuse blocks, a choice of three connector types
or wire terminations is available:

littelfuse.com

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Technical Application Guide

FUSE CHARACTERISTIC CURVES AND CHARTS
1000
800
600
400
300
200

The performance capabilities of various fuses are graphically
represented by two different types of fuse characteristic
curves: time-current curves and peak let-through charts.
These curves and charts define the operating characteristics
of a given fuse, and assist system designers and engineers
in selecting the proper fuse to protect equipment and
electrical systems.

100
80
60
40
30
20

TIME IN SECONDS

Understanding Time-current Curves
Time-current curves provide a graphical representation
or plot of a fuse’s average melting (opening) time at any
current. Time-current curves for Littelfuse POWR-GARD®
fuses can be found online at
littelfuse.com/technicalcenter.

GREEN = TIME-DELAY FUSE
RED = NORMAL OPENING FUSE
BLUE = VERY-FAST ACTING FUSE

20000
30000
40000
60000
80000
100000

2000
3000
4000
6000
8000
10000

200
300
400
600
800
1000

20
30
40
60
80
100

10

CURRENT IN AMPERES

Figure 5 – Comparison of Average Melting Times for
Three Fuse Types

of three fuse types: Littelfuse dual-element, time-delay
LLSRK series class RK1 fuses (green); Littelfuse normal
opening NLS series class K5 fuses (red); and Littelfuse very
fast acting L60S series semiconductor fuses (blue).
To better illustrate this point, Table 3 also compares the
opening times for each of these fuses.

400 A
600 A

200 A

60 A
100 A

30 A

15 A

1
.8
.6
.4
.3
.2

.01

As discussed earlier in the Fuseology Fundamentals
section, time-delay, fast-acting, and very fast-acting fuses
all respond differently based on the overcurrents occurring
in the systems each is protecting. To illustrate the basic
differences between each type of fuse, Figure 5 compares
the average melting times for 100 and 600 amp ratings

AMPERE
RATING

FUSE TYPE

100

NORMAL OPENING

TIME-DELAY
VERY FAST-ACTING
TIME-DELAY

600

100
80
60
40
30
20

TIME IN SECONDS

100 AMP

.1
.08
.06
.04
.03
.02

In order to make the curves more readable, the performance
information is presented on log-log paper. The overcurrent
values appear across the bottom and increase in magnitude
from left to right. Average melting times appear on the
left-hand side of the curve and increase in magnitude from
bottom to top. The ampere ratings of the individual fuses
for a given series are listed at the top and increase in rating
from left to right. Figure 4 shows the average melting time
curves for a typical time-delay fuse series.

1000
800
600
400
300
200

600 AMP

10
8
6
4
3
2

NORMAL OPENING
VERY FAST-ACTING

OPENING TIME IN SECONDS
500% RATING 800% RATING 1200% RATING

12 secs.
2 secs.
1.3 secs.
14 secs.
10 secs.
2 secs.

0.9 secs.
0.7 secs.
0.02 secs.
0.7 secs.
3 secs.
0.05 secs.

0.14 secs.
0.3 secs.
>0.01 secs.
0.045 secs.
1.1 secs.
>0.01 secs.

Table 3 – Comparative Opening Times for Time-Delay, FastActing, and Very Fast-Acting Fuses

10
8
6
4
3
2

Peak Let-through Charts
Peak let-through charts illustrate the maximum instantaneous
current through the fuse during the total clearing time. This
represents the current limiting ability of a fuse.

1
.8
.6
.4
.3
.2

Fuses that are current-limiting open severe short-circuits
within the first half-cycle (180 electrical degrees or 0.00833
seconds) after the fault occurs. Current-limiting fuses also
reduce the peak current of the available fault current to a
value less than would occur without the fuse. This reduction
is shown in Figure 6.

.1
.08
.06
.04
.03
.02
20000
30000
40000
60000
80000
100000

2000
3000
4000
6000
8000
10000

200
300
400
600
800
1000

20
30
40
60
80
100

10

.01

CURRENT IN AMPERES

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Technical

A fuse’s current-limiting effects are shown graphically on
Peak Let-through charts such as the one shown in Figure 7.
The values across the chart’s bottom represent the available

Figure 4 – Average Melting Time Curves for Typical Time-Delay
Fuse Series

11

Technical Application Guide

FUSE CHARACTERISTIC CURVES AND CHARTS

Current

Peak current which would
occur without current limitation

The diagonal curves that branch off the A-B line illustrate the
current-limiting effects of different fuse ampere ratings for
a given fuse series. To continue the example from above,
enter the chart in Figure 7 on the bottom at 100,000 rms
symmetrical amperes and read upwards to the intersection
of the 200 ampere fuse curve. Now read from this point
horizontally to the left and read a peak let-through current of
approximately 20,000 amperes.

Peak Let-Thru Current

What this tells us is that the 200 ampere fuse has reduced
the peak current during the fault from 230,000 amperes to
20,000 amperes. In other words, this is the current-limiting
effect of the 200 ampere fuse. 20,000 amperes is less than
one-tenth of the available current. This is important because
the magnetic force created by current flow is a function of
the peak current squared. If the peak let-through current of
a current-limiting fuse is one-tenth of the available peak, the
magnetic force is reduced to less than 1/100 of what would
occur without the fuse.

Time

Figure 6 – Current limiting effect of fuses

(also referred to as potential or prospective) rms symmetrical
fault current. The values on the chart’s left side represent
the instantaneous available peak current and the peak letthrough current for various fuse ratings.

Using the Peak Let-through Charts
(“Up-Over-and-Down”)

To better explain the function of these charts, let’s run
through an example. Start by entering the chart on the
bottom at 100,000 rms symmetrical amperes and read
upwards to the A-B line. From this point, read horizontally
to the left and read the instantaneous peak let-thru current
of 230,000 amperes. In a circuit with a typical 15% shortcircuit power factor, the instantaneous peak of the available
current is approximately 2.3 times the rms symmetrical
value. This occurs since the A-B line on the chart has a
2.3:1 slope.

PEAK LET-THRU IN AMPERES

1000000
800000
600000
400000
300000
200000

Technical

Start by locating the 100,000 A available fault-current on the
bottom of the chart (Point A) and follow this value upwards
to the intersection with the 600 amp fuse curve (Point B).
Next, follow this point horizontally to the left to intersect
with the A-B line (Point C). Finally, read down to the bottom
of the chart (Point D) to read a value of approximately 18,000
amps.

FUSE
AMPERE
RATING
600
400
200
100
60
30

10000
8000
6000
4000
3000
2000

Can the fuse selected properly protect the equipment for
this application? Yes, the POWR-PRO® LLNRK 600 ampere
RK1 current-limiting fuses have reduced the 100,000
amperes available current to an apparent or equivalent
18,000 amps. When protected by 600 amp LLNRK RK1
fuses, equipment with short-circuit ratings of 22,000 amps
may be safely connected to a system having 100,000
available rms symmetrical amperes.

A

This method, sometimes referred to as the “Up-Over-andDown” method, may be used to:

200000

20000

30000
40000
60000
80000
100000

3000
4000
6000
8000
10000

2000

300
400
600
800
1000

200

100
100

11

For example, given an available fault-current of 100,000
rms symmetrical amperes, determine whether 600 amp
250 volt time-delay Class RK1 fuses can sufficiently protect
equipment that has a 22,000 amp short-circuit rating. Refer
to Figure 8.

B

100000
80000
60000
40000
30000
20000

1000
800
600
400
300
200

Peak Let-through Charts for Littelfuse POWR-GARD® fuses
can be found online at littelfuse.com/technicalcenter.
These charts are useful in determining whether a given fuse
can properly protect a specific piece of equipment.

1.	 Provide back-up short-circuit protection to large air
power circuit breakers.

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

2.	 Enable non-interrupting equipment such as bus duct to be

Figure 7 – Peak Let-through Charts
Figure 14
littelfuse.com

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FUSE CHARACTERISTICS CURVES AND CHARTS

Only the overcurrent device immediately on the line side of an
overcurrent will open for any overload or short-circuit condition.

B

100000
80000
60000
40000
30000
20000

B

C

600
400
100
60
30

In a selective system, none of this occurs. Overloads and
faults are disconnected by the overcurrent protective device
immediately on the line side of the problem. The amount of
equipment removed from service is minimized, the faulted
or overloaded circuit is easier to locate, and a minimum
amount of time is required to restore full service.

A
200000

3000
4000
6000
8000
10000

2000

300
400
600
800
1000

200

A
30000
40000
60000
80000
100000

D

100
100

Since the advent of electrical and electronic equipment,
businesses have become entirely dependent on the
continuous availability of electric energy. Loss of power
halts all production and order processing, yet expenses
continue to increase. Even many UPS systems become
unintentionally non-selective causing power loss to
computers and other critical equipment. Non-selectivity may
defeat otherwise well-engineered UPS systems.

200

10000
8000
6000
4000
3000
2000
1000
800
600
400
300
200

To further clarify, refer to the Terms and Definitions section
for the definition of Selective Coordination and Figure 15 for a
graphical example.

FUSE
AMPERE
RATING

20000

PEAK LET-THRU IN AMPERES

1000000
800000
600000
400000
300000
200000

AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES

For these and many other reasons, selectivity is the
standard by which many systems are judged and designed.

Figure 8 – Peak Let-through Chart for POWR-PRO® LLNRK Class
RK1 Dual-Element Fuses Using the Up-Over-and-Down Method

Fuse Selectivity

installed in systems with available short-circuit currents
greater than their short circuit (withstand) ratings.

To get a better sense of how to ensure that fuses are
selectively coordinated within an electrical system, refer
to Figure 4 shown earlier in this Technical Application
Guide. This figure shows typical average melting timecurrent curves for one class of fuses. Note that the curves
are roughly parallel to each other and that for a given
overcurrent, the smaller fuse ratings respond quicker than
the larger ratings. The heat energy required to open a fuse
is separated into melting I2t and arcing I2t (see definition of
Ampere-Squared-Seconds). The sum of these is the total
clearing I2t.

However, this method may not be used to select fuses for
backup protection of molded case or intermediate frame
circuit breakers. National Electrical Code® (NEC®) Article
240.86 requires Series Ratings. Refer to the NEC® for more
information.
UL Listed fuse-to-circuit breaker series ratings are now
available from most national load center and panelboard
manufacturers. Listings are shown in their product digests,
catalogs, and online. Many local builders have also obtained
fuse-to-circuit breaker series ratings. For additional
information contact the Littelfuse Technical Support Group at
1-800-TEC-FUSE (1-800-832-3873).

For a system to be considered coordinated, the smaller
fuse total clearing I2t must be less than the larger fuse
melting I2t. In other words, if the downstream (branch)
fuse opens the circuit before the overcurrent affects
the upstream (feeder) fuse element, the system will be
considered selective. This can be determined by analyzing
curves displaying melting and total clearing I2t, or from
minimum melting and maximum clearing time-current
curves.

Short-Circuit Current Rating (SCCR)
Since 2005, the NEC® has required Industrial Control Panels
to be labeled with their SCCR. These labels allow users
and inspectors to compare the SCCR of the equipment
to the available fault current in order to avoid potential
hazards in facilities.

Selective Coordination
A “coordinated” or “selective” system is a system whose
overcurrent protective devices have been carefully chosen and
their time-current characteristics coordinated.

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11
Technical

But the simplest method of coordinating low voltage power
fuses is by using a Fuse Coordination Table such as the
one shown in Table 4. This table is only applicable for the
Littelfuse POWR-PRO® and POWR-GARD® fuse series listed.
Tables such as this greatly reduce design time. For example,
the coordination table shows that POWR-PRO KLPC Class
L fuses coordinate at a two-to-one ratio with other Class L
fuses, with POWR-PRO LLNRK / LLSRK / LLSRK_ID series

Technical Application Guide

SELECTIVE COORDINATION

Class RK1 fuses, and POWR-PRO JTD / JTD_ID series Class
J fuses.

properly protected by overcurrent protective devices that
will limit damage.

In the system shown in Figure 9, the 3000 amp Class L
main fuses are at least twice the ratings of the 1500, 1200,
and 1000 amp Class L feeder fuses. Using the 2:1 ratio
just referenced above, it is determined that these fuses
will coordinate. The Coordination Table also shows that the
LLSRK_ID series time-delay RK1 feeder and branch circuit
fuses coordinate at a two-to-one ratio with the Class L
feeder fuses, so the entire system in Figure 9 would be
considered 100% coordinated.

When a severe fault occurs in an unprotected circuit, current
immediately increases to a very high value. This is the
available or prospective fault current. Some fuses respond
so quickly to the increasing current that they interrupt
current within the first half-cycle - or before the current even
reaches its first peak. This is illustrated in Figure 6 found
earlier in the Technical Application Guide. Such fuses are
termed “current-limiting fuses.”
Current-limiting fuses stop damaging current faster than
any other protective device, and greatly reduce or totally
prevent component damage from high fault currents. This
performance capability helps users meet the NEC® Article
110.10 requirements listed in Figure 10.

Circuit Breaker Coordination
As a result of the numerous types of circuit breakers
and circuit breaker trip units available in today’s market,
developing a coordinated circuit breaker system or
coordinating circuit breakers with fuses is beyond the scope
of this Technical Application Guide. For further questions,
contact the Littelfuse Technical Support Group.

Pre-Engineered Solutions
Applicable code requirements also continue to expand with
each new edition of the National Electrical Code®. As of the
2014 edition of the NEC®, the following requirements need
to be met – and can be, utilizing Littelfuse POWR-GARD®
Pre-Engineered Solutions:

NEC® Requirements for Selective
Coordination
Component Short-Circuit Protecting Ability

•	 NEC 517.26 – Healthcare Essential Electrical Systems

As shown in Figure 10, the NEC® requires equipment
protection to be coordinated with overcurrent protective
devices and the available fault current in order to prevent
extensive damage to the equipment. Essentially, this
means that electrical equipment must be capable of
withstanding heavy overcurrents without damage or be

•	 NEC 620.82 – Elevators
•	 NEC 700.27 – Emergency Systems
•	 NEC 701.27 – Legally Required Standby Systems
•	 NEC 708.54 – Critical Operations Power Systems

LINE-SIDE FUSES

AMPERE
RANGE

Technical

11

601-6000
601-4000
601-2000
30-600
30-600
30-600
30-600
30-600
30-600
30-600
30-600
30-1200
30-1200
30-600
1-60

UL CLASS

L
L
L
RK1
RK1
J
RK5
RK5
RK5
RK1
RK1
T
T
J
G

LOAD-SIDE FUSES

LITTELFUSE
CATALOG
NUMBER

KLPC
KLLU
LDC
LLNRK
LLSRK_ID
JTD_ID
IDSR
FLNR_ID
FLSR_ID
KLNR
KLSR
JLLN
JLLS
JLS
SLC

601-6000
L
KLPC
LDC
2:1
2:1
2:1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A

TIME-DELAY FUSES
AMPERE RANGE, UL CLASS AND CATALOG NO.
601-4000
30-600
30-600
30-600
L
RK1
J
RK5
FLNR_ID
LLNRK
JTD_ID
KLLU
FLSR_ID
LLSRK_ID
JTD
IDSR
2:1
2:1
2:1
4:1
2:1
2:1
2:1
4:1
2:1
2:1
2:1
4:1
N/A
2:1
2:1
8:1
N/A
2:1
2:1
8:1
N/A
2:1
2:1
8:1
1.5:1
2:1
N/A
1.5:1
N/A
1.5:1
1.5:1
2:1
N/A
1.5:1
1.5:1
2:1
N/A
3:1
3:1
8:1
N/A
3:1
3:1
8:1
N/A
3:1
3:1
8:1
N/A
3:1
3:1
8:1
N/A
3:1
3:1
8:1
N/A
3:1
3:1
4:1

0-30
CC

FAST-ACTING FUSES
AMPERE RANGE, UL CLASS AND CATALOG NO.
30-600
30-1200
30-600
1-60
RK1
T
J
G

CCMR

KLNR
KLSR

JLLN
JLLS

JLS

SLC

2:1
2:1
2:1
2:1
2:1
2:1
2:1
2:1
2:1
N/A
N/A
N/A
N/A
N/A
N/A

2:1
2:1
2:1
3:1
3:1
3:1
1.5:1
1.5:1
1.5:1
3:1
3:1
3:1
3:1
3:1
2:1

2:1
2:1
2:1
3:1
3:1
3:1
1.5:1
1.5:1
1.5:1
3:1
3:1
3:1
3:1
3:1
2:1

2:1
2:1
2:1
3:1
3:1
3:1
1.5:1
1.5:1
1.5:1
3:1
3:1
3:1
3:1
3:1
2:1

N/A
N/A
N/A
4:1
4:1
4:1
1.5:1
1.5:1
1.5:1
4:1
4:1
4:1
4:1
4:1
2:1

Table 4 – Fuse Coordination Table. Selecting the Correct Fuse Ampere Ratio to Maintain Selectively Coordinated Systems.
(Ratios are expressed as Line-Side Fuse to Load-Side Fuse.)

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Technical Application Guide

SELECTIVE COORDINATION

The Littelfuse product line of Pre-Engineered Solutions
includes:
KLPC
3000

•	 LPS Series POWR-Switch (single elevator shunt-trip
disconnect switch)
•	 LCP Selective Coordination Panel
These products continue to gain in popularity because they
meet NEC® requirements and offer simple, economical
solutions for a variety of applications.

KLPC
1500

KLPC
1200

KLPC
1000

Visit littelfuse.com/lcp for more information on Littelfuse
Pre-Engineered Solution products and corresponding
selective coordination requirements.
LLSRK
400

LLSRK
400

LLSRK
200

LLSRK
200

Figure 9 – Example of Selectively Coordinated Fused System

NATIONAL ELECTRICAL CODE®

ARTICLE 110 – Requirements for Electrical Installations
I. General
110.3. Examination, Identification, Installation, and Use of Equipment.
(A)	Examination. In judging equipment, considerations such as the following shall be evaluated:
(5)	 Heating effects under normal conditions of use and also under abnormal conditions likely to arise in service.
(6)	 Arcing effects.
(B)	Installation and Use. Listed or labeled equipment shall be used or installed in accordance with any instructions included in the listing
or labeling.

110.9 Interrupting Rating. Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit
voltage sufficient for the current that is available at the line terminals of the equipment.
Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage sufficient for
the current that must be interrupted.
110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics. The overcurrent protective devices, the
total impedance, the equipment short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and
coordinated to permit the circuit protective devices used to clear a fault to do so without extensive damage to the electrical equipment of
the circuit. This fault shall be assumed to be either between two or more of the circuit conductors or between any circuit conductor and
the equipment grounding conductor(s) permitted in 250.118. Listed equipment applied in accordance with their listing shall be considered
to meet the requirements of this section.
ARTICLE 240 – Overcurrent Protection
240.1 Scope. Parts I through VII of this article provide the general requirements for overcurrent protection and overcurrent protective
devices not more than 1000 volts, nominal. Part VIII covers overcurrent protection for those portions of supervised industrial installations
operating at voltages of not more than 1000 volts, nominal. Part IX covers overcurrent protection over 1000 volts, nominal.
	 Informational Note: Overcurrent protection for conductors and equipment is provided to open the circuit if the current reaches a value
that will cause an excessive or dangerous temperature in conductors or con­ductor insulation. See also Articles 110.9 for requirements for
interrupting ratings and 110.10 for require­ments for protection against fault currents.

Figure 10 – National Electrical Code Requires Effective Overcurrent Protection

© 2014 Littelfuse POWR-GARD® Products Catalog

193

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Technical

(Reproduced by permission of NFPA)

11

Technical Application Guide

UL/CSA FUSE CLASSES AND APPLICATIONS
Overcurrent and short-circuit protection of power and lighting feeders and branch circuits
Current Limiting
Fuses which meet the requirements for current limiting fuses are required to be labeled “Current Limiting”. Fuse labels must
include: UL/CSA fuse class, manufacturer’s name or trademark, current rating, AC and/or DC voltage rating, and AC and/or DC
interrupting rating. “Time Delay”, “D”, “TD” or equivalent may also be included on the label when the fuse complies with the
time delay requirements of its class.

CLASS L

CLASS CC/CD

STANDARDS:				UL Standard 248-14,
								CSA Standard C22.2, No. 106, classified as HRCI-L
VOLTAGE RATING:			 600 volts, AC and/or DC
CURRENT RATINGS:		 601-6000 amps
								KLPC also available 200-600A; LDC also available 150-600A
INTERRUPTING RATING:	AC: 200,000 amps rms symmetrical
								DC: 50,000, 100,000, or 200,000 amps
Not interchangeable with any other UL fuse class.
Time delay: Class L fuses may be marked “Time-Delay” although UL does not
investigate time-delay characteristics of Class L fuses.
KLPC & KLLU:				 10 seconds at 500% current rating
LDC:							4 seconds at 500% current rating

STANDARDS:				UL Standard 248-4,
								 CSA Standard C22.2, No. 106, classified as HRCI Misc.
VOLTAGE RATING:			600 volts, AC
CURRENT RATINGS:		 UL Class CC: 0-30 amps
								UL Class CD: 35-60 amps
INTERRUPTING RATINGS:	200,000 amps rms symmetrical
Time delay optional: Minimum of 12 seconds at 200% current rating.
LF SERIES:	 Time Delay: CCMR (motors), KLDR (transformers)
				Fast Acting: KLKR
PAGE: 27

LF SERIES: KLPC, KLLU, LDC

CLASS T

PAGE: 8

STANDARDS:				UL Standard 248-15
								CSA Standard C22.2, No. 106, classified as HRCI-T
VOLTAGE RATINGS:		 300 and 600 volts AC, 125 and 300 volts DC
CURRENT RATINGS:		 0-1200 amps
								 900 to 1200 amps UL Recognized for 600V version
INTERRUPTING RATING:	200,000 amps rms symmetrical
Fast-Acting fuses. High degree of current limitation.
Very small fuses; space-saving and non-interchangeable with any other UL fuse class.

CLASS R

STANDARDS:				UL Standard 248-12,
								CSA Standard C22.2, No. 106, classified as HRCI-R
VOLTAGE RATINGS:		 250 and 600 volts, AC; 125 and 300 volts DC
CURRENT RATINGS:		 0-600 amps
INTERRUPTING RATING:	200,000 amps rms symmetrical
TWO CLASSES:				RK1 and RK5
Time delay is optional for Class R fuses.
Time Delay fuses are required to hold 500% current rating for a minimum of ten seconds.
Same dimensions as UL Class H fuses, terminals modified to provide rejection feature.
Fits UL Class R fuse holders which reject non Class R fuses.
Physically interchangeable with UL Class H, NEMA Class H, and UL Classes K1 &
K5 when equipment has Class H fuse holders.

LF SERIES:	 JLLN, JLLS
PAGE: 24

CLASS G

STANDARDS:				UL Standard 248-5
								 CSA Standard C22.2, No. 106, classified as HRCI Misc.
VOLTAGE RATING:			480 volts, AC
CURRENT RATINGS:		 0-60 amps
INTERRUPTING RATING:	100,000 amps rms symmetrical
Not interchangeable with any other UL fuse class.
Time delay optional: Minimum of 12 seconds at 200% current rating.

CLASS RK5

CLASS RK1

High degree of current limitation.
Provides IEC Type 2 (no damage)
protection for motor starters and
control components. Time Delay
optional, LLSRK_ID Series provides
visual indication of blown fuse.

Moderate degree of current limitation, adequate for most applications. Time delay optional.
FLNR_ID, FLSR_ID and IDSR series
provides visual indication of blown
fuse.

LF SERIES:	Time Delay: LLNRK,
LLSRK, LLSRK_ID
Fast Acting: KLNR, KLSR

LF SERIES:	FLNR, FLNR_ID,
FLSR, FLSR_ID, and IDSR

PAGE: 13

LF SERIES:	 SLC
PAGE: 26

CLASS K

PAGE: 16

STANDARDS:				UL Standard 248-9; No CSA Standard
VOLTAGE RATINGS:		 250 and 600 volts, AC
CURRENT RATING:		 0-600 amps
INTERRUPTING RATINGS:	Three permitted: 50,000, 100,000, and 200,000 amps
								rms symmetrical
Time delay is optional for Class K fuses.
Time Delay fuses are required to hold 500% current rating for a minimum of ten seconds.
Same Dimensions and Physically interchangeable with UL Class H fuse holders.
Class K fuses are not permitted to be labeled Current Limiting because there is no rejection feature as required by NEC® Article 240-60(B).

CLASS J

STANDARDS:				UL Standard 248-8,
								CSA Standard C22.2, No. 106, classified as HRCI-J
VOLTAGE RATING:			600 volts, AC
CURRENT RATINGS:		 0-600 amps
INTERRUPTING RATING:	200,000 amps rms symmetrical
Not interchangeable with any other UL fuse class.
Time delay optional: Minimum of 10 seconds at 500% current rating.

CLASS K1

LF SERIES:	Time Delay: JTD_ID, JTD
Fast Acting: JLS
PAGE: 21

Technical

11

CLASS K5

Same prescribed degree of current
limitation as RK1 fuses when
tested at 50,000 or 100,000 amps
rms symmetrical.

Same prescribed degree of current
limitation as RK5 fuses when
tested at 50,000 or 100,000 amps
rms symmetrical.

LF SERIES:	 Time Delay: LLNRK, 	
				LLSRK
				Fast Acting: KLNR,
				KLSR

LF SERIES: NLN, NLS
PAGE: 20

PAGE: 13

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Technical Application Guide

UL/CSA FUSE CLASSES AND APPLICATIONS
Overcurrent and short-circuit protection of power and lighting feeders and branch circuits

FUSES FOR SUPPLEMENTARY OVERCURRENT PROTECTION

SPECIAL PURPOSE FUSES

STANDARDS:		 UL Standard 248-14; CSA Standard C22.2,
						No. 59-1. Three Classifications covered:
NOTE:				Fuses may be rated for AC and/or DC when suitable for
						such use.
(1)	 MICRO FUSES
	 Voltage ratings:		 UL, 125 volts; CSA, 0-250 volts
	 Current ratings:		 UL, 0-10 amps; CSA, 0-60 amps
	 Interrupting rating:	 50 amps rms symmetrical
(2)	 MINIATURE FUSES (CSA classifies these as Supplemental Fuses)
	 Voltage ratings:		 UL, 125 or 250 volts; CSA, 0-600 volts
	 Current ratings:		 UL, 0-30 amps; CSA, 0-60 amps
	 Interrupting rating:	 10,000 amps rms symmetrical
(3)	 MISCELLANEOUS CARTRIDGE FUSES (CSA classifies these as
	 Supplemental Fuses)
	 Voltage ratings:		 UL, 125-1000 volts; CSA, 0-100 volts
	 Current ratings:		 UL, 0-30 amps; CSA 0-60 amps
	 Interrupting ratings:	10,000, 50,000, or 100,000 amps rms symmetrical
Time delay (Optional); Minimum delay at 200% fuse rating:
	 5 seconds for fuses rated 3 amps or less
	 12 seconds for fuses rated more than 3 amps

There are no UL Standards covering this category of fuses. These fuses have
special characteristics designed to protect special types of electrical or electronic
equipment such as diodes, SCR, transistors, thyristors, capacitors, integrally fused
circuit breakers, parallel cable runs, etc.
Fuses may be UL Recognized for use as a component in UL Listed equipment.
UL Recognized fuses are tested for characteristics such as published interrupting
capacity. They are also covered by UL re-examination service.
Non-renewable
VOLTAGE RATINGS:			 up to 1000 volts AC and/or DC
AMPERE RATINGS:			 up to 6000 amperes
INTERRUPTING RATINGS:	 up to 200,000 amperes
Many of these fuses are extremely current limiting. When considering application of
these fuses, or if you have special requirements, contact Littelfuse Technical Support
Group for assistance.
LF SERIES:	 KLC, LA15QS, LA30QS, LA50QS, LA60QS, LA60X, LA70QS, LA100P,
LA120X, LA070URD, LA130URD, L15S, L25S, L50S, L60S, L70S, JLLS 900 amp
through 1200 amp
PAGES: 56

LF SERIES:	 BLF, BLN, BLS, FLA, FLM, FLQ, FLU, KLK, KLQ KLKD, SPF
NOTE: Littelfuse electronic fuses are also covered by these standards; see
electronic section of this catalog, or littelfuse.com for complete listing.
PAGE: 30

Non-Current Limiting
CLASS H

PLUG FUSES

STANDARDS:	
UL Standard 248-6
	CSA Standard C22.2, No. 59.1
Also known as NEMA Class H, and sometimes
referred to as “NEC” or “Code” fuses
VOLTAGE RATINGS:	
250 and 600 volts, AC
AMPERE RATINGS:	
0-600 amps
INTERRUPTING RATINGS:	
10,000 amps rms symmetrical
Two types: one-time and renewable
Physically interchangeable with UL Classes K1 & K5;
Fits UL Class H fuse holders which will also accept K1, K5, RK5, and RK1 fuses.
Manufacturers are upgrading Class H One-time fuses to Class K5 per UL Standard
248-9D, See Class K fuses.

ONE-TIME FUSES
(NON-RENEWABLE)

Time delay:	 Optional
Time-delay fuses must hold 500%
current rating for a minimum of ten
seconds.
LF SERIES:	 NLKP
PAGE: 20

STANDARDS:	
UL Standard 248-11,
	
CSA Standard C22.2, No. 59.1
VOLTAGE RATINGS:	
125 volts AC only
0-30 amps
AMPERE RATINGS:	
INTERRUPTING RATINGS:	10,000 amps rms symmetrical. Interrupting
rating need not be marked on fuse.
Two types: Edison-base and Type S
	EDISON-BASE: Base is same as standard light bulb. All amp ratings interchange
	 able. NEC® permits Edison-base plug fuses to be used only as replacements for
	 existing fuses, and only when there is no evidence of tampering or overfusing.
	 TYPE S: Not interchangeable with Edison-base fuses unless non-removable Type
	 S fuse adapter is installed in Edison-base fuse socket. To prevent overfusing,
	 adapters have three ampere ratings: 10-15, 16-20, and 21-30 amps.
Time delay: Fuses may be time delay, if so, they are required to hold 200% of rating
for 12 seconds minimum.
NOTE: Plug fuses may be used where there is not more than 125 volts between
conductors or more than 150 volts from any conductor to ground. This permits their
use in 120/240 volts grounded, single-phase circuits.

RENEWABLE FUSES

Only Class H fuses may be renewable. While time delay is optional,
no renewable fuses meet requirements for time delay.
Some renewable fuses have a moderate amount of time delay, referred
to as “time lag” to differentiate
from true time delay.

LF SERIES:	 Edison-base: TOO, TLO
				Type S: SOO, SLO
				Type S Adapters: SAO
PAGE: 63

LF SERIES:	 Discontinued - Please
cross to RK5 or RK1 class fuses

Additional Resources and POWR-GARD® Products
Littelfuse is continually developing new technical resources
and products that meeting evolving industry standards.
For the latest information, visit:
littelfuse.com

195

Technical

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Technical Application Guide

TERMS AND DEFINITIONS

Arc Gap – The distance between energized conductors or
between energized conductors and ground. Shorter arc gaps
result in less energy being expended in the arc, while longer
gaps reduce arc current. For 600 volts and below, arc gaps of
1.25 inches (32 mm) typically produce the maximum incident
energy.

Adjustable Alarm Level – A setting on a protection relay at
which an LED or an output contact operates to activate a visual
or audible alarm.
Adjustable Time Delay – A setting on a protection relay that
determines the time between the fault detection and relay
operation.

Arc Rating – A rating assigned to material(s) that relates to the
maximum incident energy the material can resist before break
open of the material or onset of a second-degree burn. The arc
rating is typically shown in cal/cm².

AIC or A.I.C. – See Interrupting Capacity.
AIR or A.I.R. – See Interrupting Rating.
Alarm Relay Contact – The output of the relay that acts as a
switch and is connected to a visual or audible alarm.

Arcing Current (See Figure 11) – The current that flows through
the fuse after the fuse link has melted and until the circuit is
interrupted.

Ampacity – The current in amperes that a conductor can carry
continuously under the conditions of use without exceeding
its temperature rating. It is sometimes informally applied to
switches or other devices which are more properly referred to
by their ampere rating.

Peak Let-Thru Current
Arcing
Current

Ampere Rating – The current rating, in amperes, that is marked
on fuses, circuit breakers, or other equipment.

Melting Energy (I2t)

Time
Melting
Time

•	 Melting I2t is the heat energy passed by a fuse after an
overcurrent occurs and until the fuse link melts. It equals
the rms current squared multiplied by the melting time in
seconds. For times less than 0.004 seconds, melting I2t
approaches a constant value for a given fuse.

Arcing I2t – See Ampere-Squared-Seconds (I2t).
Arcing Fault – A short-circuit that arcs at the point of fault. The
arc impedance (resistance) tends to reduce the short-circuit
current. Arcing faults may turn into bolted faults by welding of
the faulted components. Arcing faults may be phase-to-phase
or phase-to-ground.

•	 Clearing I2t (also Total Clearing I2t) is the ampere-squared
seconds (I2t) through an overcurrent device from the
inception of the overcurrent until the current is completely
interrupted. Clearing I2t is the sum of the Melting I2t plus the
Arcing I2t.

Arcing Time (See Figure 11) – The time between the melting
of a fuse link or parting of circuit breaker contacts, until the
overcurrent is interrupted.
Arc Voltage (See Figure 12) – Arc voltage is a transient voltage
that occurs across an overcurrent protection device during
the arcing time. It is usually expressed as peak instantaneous
voltage (Vpeak or Epeak), or on rare occasion as rms voltage.

Analog Output – A 0–1 mA, 4–20 mA or 0–5 Vdc signal from
a protection relay used to pass information to a device or
controller.

Technical

Arcing
Time

Figure 11 – Arcing and melting currents plus arcing, melting and clearing
times

•	 Arcing I2t is the heat energy passed by a fuse during its
arcing time. It is equal to the rms arcing current squared (see
definition below), multiplied by arcing time.

Arc-Blast – A pressure wave created by the heating, melting,
vaporization, and expansion of conducting material and
surrounding gases or air.

Asymmetrical Current – See Symmetrical Current.
Available Short-Circuit Current (also Available or
Prospective Fault Current) – The maximum rms Symmetrical
Current that would flow at a given point in a system under
bolted-fault conditions. Short-circuit current is maximum during
the first half-cycle after the fault occurs. See definitions of
Bolted Fault and Symmetrical Current.

Arc-Flash – The sudden release of heat energy and intense
light at the point of an arc. Can be considered a short-circuit
through the air, usually created by accidental contact between
live conductors.
littelfuse.com

Arcing Energy (I2t)

Melting
Current

Ampere-Squared-Seconds (I2t) – A means of describing the
thermal energy generated by current flow. When a fuse is
interrupting a current within its current-limiting range, the term
is usually expressed as melting, arcing, or total clearing I2t.

11

Peak current which would
occur without current limitation

Current

Ambient Temperature – The air temperature surrounding a
device. For fuses or circuit breakers in an enclosure, the air
temperature within the enclosure.

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TERMS AND DEFINITIONS

Coordination or Coordinated System – See Selective
Coordination.

PEAK
INSTANTANEOUS ARC VOLTAGE
183% OF CYCLEPEAK

Continuous Load – An electrical load where the maximum
current is expected to continue for three hours or more.

RESTORED VOLTAGE

CT Loop – The electrical circuit between a current transformer
and a protection relay or monitoring device.
Current-Based Protection – Protection parameters (trip-levels/
data collection etc.) derived from current levels in a circuit.

Figure 12 – Transient overvoltage during arcing time
Figure 2

Blade Fuse – See Knife Blade Fuse.

Current-limiting Fuse (See Figure 13) – A fuse which, when
interrupting currents within its current-limiting range, reduces
the current in the faulted circuit to a magnitude substantially
less than that obtainable in the same circuit if the device was
replaced with a solid conductor having comparable impedance.
To be labeled “current limiting,” a fuse must mate with a
fuse block or fuse holder that has either a rejection feature or
dimensions that will reject non-current-limiting fuses.

Body – The part of a fuse enclosing the fuse elements and
supporting the contacts. Body is also referred to as cartridge,
tube, or case.

Current

Bolted Fault – A short-circuit that has no electrical resistance
at the point of the fault. It results from a firm mechanical
connection between two conductors, or a conductor and
ground. Bolted faults are characterized by a lack of arcing.
Examples of bolted faults are a heavy wrench lying across two
bare bus bars, or a crossed-phase condition due to incorrect
wiring

Current which would
flow if not interrupted

Boundaries of Approach – Protection boundaries established
to protect personnel from shock and Arc-Flash hazards.
Calorie – The amount of heat needed to raise the temperature
of one gram of water by one degree Celsius.1 cal/cm² is
equivalent to the exposure on the tip of a finger by a cigarette
lighter for one second.

Current before fault
Fault occurs

Time

Cartridge Fuse – A fuse that contains a current-responsive
element inside a tubular fuse body with cylindrical ferrules (end
caps).

Fuse opens and
clears short circuit
in less than ½ cycle

Case Size (also Cartridge Size) – The maximum allowable
ampere rating of a cartridge fuse having defined dimensions
and shape. For example, case sizes for UL Listed Class H, K, J,
RK1, and RK5 are 30, 60, 100, 200, 400, and 600 amperes. The
physical dimensions vary with fuse class, voltage, and ampere
rating. UL Standards establish the dimensions for each UL
Fuse Class. This catalog’s product section contains case size
dimensions for all Littelfuse POWR-GARD® fuses.

Arc is extinguished

Figure 13 – Current-limiting Fuse

Current-limiting Range - For an individual overcurrent
protective device, the current-limiting range begins at the
lowest value of rms symmetrical current at which the device
becomes current-limiting (the threshold current) and extends
to the maximum interrupting capacity of the device. See
definitions of Threshold Current and Interrupting Capacity.

Clearing I2t – See Ampere-Square-Seconds (I2t).

Current Rating – See Ampere Rating.

Clearing Time (see Figure 11) – The time between the initiation
of an overcurrent condition to the point at which the overcurrent
is interrupted. Clearing Time is the sum of Melting Time and
Arcing Time.

Current Transformer (CT) – A transformer that produces a
current in its secondary circuit in a known proportion to current
in its primary circuit.

Conformal Coating – Coating used to protect circuit boards
from pollutants, corrosion, and mildew.

Data Logging – Collecting and storing information in a
format that can be reviewed for trending, troubleshooting and
reporting.

© 2014 Littelfuse POWR-GARD® Products Catalog

DFT (Discrete Fourier Transform) Harmonic Filter – An
algorithm used to measure the fundamental component of
current and voltage and reject harmonics. This allows lower trip
settings and eliminates nuisance trips due to harmonics.
197

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Technical

Contacts (Fuse) – The external metal parts of the fuse used to
complete the circuit. These consist of ferrules, caps, blades or
terminals, as shown in this catalog.

Technical Application Guide

TERMS AND DEFINITIONS

Flash Protection Boundaries, and required PPE. It also helps
define safe work practices.

Distance to Arc – Refers to the distance from the receiving
surface to the arc center. The value used for most calculations is
typically 18 inches.

Flash Protection Boundary – A protection boundary
established to protect personnel from Arc-Flash hazards.
The Flash Protection Boundary is the distance at which
an unprotected worker can receive a second-degree
burn to bare skin.

Dual-Element Fuse – A fuse with internal construction
consisting of a separate time-delay overload element(s) that
interrupts overcurrents up to approximately 500%-600% of
its nominal rating, plus separate fuse links that quickly open
higher value currents. All dual-element fuses have time delay,
but, since there are other methods of achieving time delay,
not all time-delay fuses have dual-element construction.
See Time-Delay Fuse.

Fuse – An overcurrent protective device consisting of one
or more current carrying elements enclosed in a body fitted
with contacts, so that the fuse may be readily inserted into or
removed from an electrical circuit. The elements are heated by
the current passing through them, thus interrupting current flow
by melting during specified overcurrent conditions.

EFCT (Earth Fault Current Transformer) – A current
transformer engineered to accurately detect low level
ground-fault current.

Ground Continuity Monitor - A protection relay that
continuously monitors a ground conductor and trips if this
conductor opens or shorts to the ground-check conductor.

Electrical Hazard Analysis – A study performed to identify the
potential electrical hazards to which personnel may be exposed.
The analysis should address both shock and Arc-Flash hazards.

Ground-Fault – Unintentional contact between a phase
conductor and ground or equipment frame. The words
“ground” and “earth” are used interchangeably when it comes
to electrical applications.

Electrically Safe Work Condition – Condition where the
equipment and or circuit components have been disconnected
from electrical energy sources, locked/tagged out, and tested to
verify all sources of power are removed.

Ground-Fault Current – The current that returns to the supply
neutral through the ground-fault and the ground-return path.

Element – A fuse’s internal current-carrying components that
melt and interrupt the current when subjected to an overcurrent
of sufficient duration or value. Also called fuse link.

Ground-Fault Protection – A system that protects
equipment from damaging ground-fault current by operating a
disconnecting means to open all ungrounded conductors of a
faulted circuit. This protection is at current levels less than those
required to operate a supply circuit overcurrent device.

Fail-Safe Mode (also known as Under Voltage or UV) –
Output relay is energized during normal (not tripped) operation.
If the protection relay loses supply voltage, the system will trip
or alarm.

Ground-Fault Relay – A protection relay designed to detect
a phase-to-ground-fault on a system and trip when current
exceeds the pickup setting for greater than the trip time setting.

Fast-Acting Fuse – May also be termed Normal-opening fuse,
this is a fuse that has no intentional or built-in time delay. Actual
opening time is determined by the fuse class, the overcurrent,
and other conditions. Fast-acting is indicated on the fuse label
by “Fast-Acting”, “F-A”, “F”, or other suitable marking.

Hazard Risk Category – A classification of risks (from 0 to
4) defined by NFPA 70E®. Each category requires PPE and is
related to incident energy levels.

Fault – Same as Short-Circuit and used interchangeably.

High-Resistance Grounding – Achieved when a neutralground resistor (NGR) is used to limit the current to a low level.
Typically high-resistance grounding is 25 A and lower. See LowResistance Grounding.

Fault Current – The current that flows when a phase conductor
is faulted to another phase or ground.
Feeder Protection – Overcurrent or overvoltage devices
installed on a feeder circuit to supplement, compliment or
replace downstream protective devices.

I2t – See Ampere-Squared-Seconds (I2t).
IEEE Device Numbers – The devices in switching equipment
are referred to by numbers, according to the functions they
perform. These numbers are based on a system which has
been adopted as standard for automatic switchgear by IEEE.
This system is used on connection diagrams, in instruction
books and in specifications.

Filler – A material, such as granular quartz, used to fill a section
or sections of a fuse and aid in arc quenching.

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11

Filter – An algorithm used to measure the fundamental
component of current and voltage and reject harmonics. This
allows lower trip settings and eliminates nuisance trips due to
harmonics.

IEC Type 2 Protection – Fused protection for control
components that prevents damage to these components under
short-circuit conditions. See definition of No Damage.

Flash Hazard Analysis – A study that analyzes potential
exposure to Arc-Flash hazards. The outcome of the study
establishes Incident Energy levels, Hazard Risk Categories,
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TERMS AND DEFINITIONS

Incident Energy – The amount of thermal energy impressed on
a surface generated during an electrical arc at a certain distance
from the arc. Typically measured in cal/cm2.

Melting Time (see Figure 11) – The time span from the initiation
of an overcurrent condition to the instant arcing begins inside
the fuse.

Instantaneous Peak Current (Ip or Ipeak) – The maximum
instantaneous current value developed during the first
half-cycle (180 electrical degrees) after fault inception. The
peak current determines magnetic stress within the circuit.
See Symmetrical Current.

Motor Protection – Overload protection designed to protect
the windings of a motor from high current levels. Modern
motor protection relays add many additional features, including
metering, data logging and communications.
NEC – In general, the National Electrical Code® (NEC®).
Specifically, as referenced herein, NEC refers to NFPA
Standard 70, National Electrical Code, National Fire Protection
Association, Quincy, MA 02269.

Insulation Monitoring – Monitoring the resistance from phase
to ground to detect insulation breakdown on a system.
Interrupting Capacity (AIC) – The highest available
symmetrical rms alternating current (for DC fuses the highest
direct current) at which the protective device has been tested,
and which it has interrupted safely under standardized test
conditions. The device must interrupt all available overcurrents
up to its interrupting capacity. Also commonly called interrupting
rating. See Interrupting Rating below.

Sections of the NEC reprinted herein, and/or quotations
there from, are done so with permission. The quoted and
reprinted sections are not the official position of the National
Fire Protection Association which is represented only by the
Standard in its entirety. Readers are cautioned that not all
authorities have adopted the most recent edition of the NEC;
many are still using earlier editions.

Interrupting Rating (IR, I.R., AIR or A.I.R.) – The highest RMS
symmetrical current, at specified test conditions, which the
device is rated to interrupt. The difference between interrupting
capacity and interrupting rating is in the test circuits used to
establish the ratings.

Neutral Grounding Resistor (NGR) – A current-limiting
resistor connecting the power-system neutral to ground.
No Damage – A term describing the requirement that a system
component be in essentially the same condition after the
occurrence of a short-circuit as prior to the short-circuit.

Inverse-time Characteristics – A term describing protective
devices whose opening time decreases with increasing current.

Non-renewable Fuse – A fuse that must be replaced
after it has opened due to an overcurrent. It cannot be
restored to service.

IR or I.R. (also AIR or A.I.R.) – See Interrupting Rating above.
Kiloamperes (kA) – 1,000 amperes.

Normal-opening Fuse – See Fast-Acting Fuse.

Knife Blade Fuse – Cylindrical or square body fuses with flat
blade terminals extending from the fuse body. Knife blades may
be designed for insertion into mating fuse clips and/or
to be bolted in place. Knife blade terminals may include a
rejection feature that mates with a similar feature on a fuse
block of the same class.

Nuisance Trip – An undesired change in relay output due to
misinterpreted readings.
One-time Fuse – Technically, any non-renewable fuse. However,
the term usually refers to UL Class H fuses and to fast acting
UL Class K5 fuses. Such fuses are not current-limiting and do
not have a rejection feature. One-time fuses are also referred to
as “Code” fuses.

Leakage Current – Very low level ground-fault current, typically
measured in milliamperes (mA, thousandths of amperes).
Limited Approach Boundary – An approach boundary
to protect personnel from shock. A boundary distance is
established from an energized part based on system voltage. To
enter this boundary, unqualified persons must be accompanied
with a qualified person and use the proper PPE.

Open CT Hazard – An open-circuited CT secondary
can develop a dangerously high voltage when the
primary is energized.
Overcurrent – Any current larger than the equipment,
conductor, or devices are rated to carry under
specified conditions.

Low-Resistance Grounding – A Resistance Grounded System
that allows high currents to flow during a ground-fault. Typically
100A and higher is considered Low-Resistance grounding. See
High-Resistance Grounding.
Melting Current (see Figure 11) – The current that flows
through the fuse from the initiation of an overcurrent condition
to the instant arcing begins inside the fuse.
Melting I2t – See Ampere-Squared-Seconds (I2t).

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Technical

Overload – An overcurrent that is confined to the normal
current path (e.g., not a short-circuit), which if allowed
to persist, will cause damage to equipment and/or
wiring. Additional information regarding fuse applications
for overload protection can be found earlier in this
Technical Application Guide.

Technical Application Guide

TERMS AND DEFINITIONS

Protection Boundaries – Boundaries established to protect
personnel from electrical hazards.

Current

Peak Let-through Current (See Figure 14) – The maximum
instantaneous current that passes through an overcurrent
protective device during its total clearing time when the
available current is within its current-limiting range.

Pulsing – Modulating the ground-fault current on a resistance
grounded system using a contactor to short out part of the NGR
elements (or to open one of two NGRs connected in parallel).
Another version of pulsing is imposing a higher frequency signal
on power lines and using a wand detector to locate the point of
fault on a conductor.

Peak current which would
occur without current limitation

QPL (Qualified Products List) – A list of approved fuses and
holders that meet various Military specifications.

Peak Let-Thru Current

Qualified Person – A person who is trained, knowledgeable,
and has demonstrated skills on the construction and operation
of the equipment, and can recognize and avoid electrical
hazards that may be encountered.
Rating – A designated limit of operating characteristics based
on definite conditions such as current rating, voltage rating and
interrupting rating.

Time

Figure 14 – Peak Let-through Current

Rectifier Fuse – See Semiconductor Fuse.

Phase Current – The current present in a phase conductor.

Rejection Feature – The physical characteristic(s) of a fuse
block or fuse holder that prevents the insertion of a fuse unless
it has the proper mating characteristics. This may be achieved
through the use of slots, grooves, projections, or the actual
physical dimensions of the fuse. This feature prevents the
substitution of fuses of a Class or size other than the Class
and size intended.

Phase Voltage – The voltage measured between a phase
conductor and ground.
Power Factor (X/R) – As used in overcurrent protection,
power factor is the relationship between the inductive
reactance (X) and the resistance (R) in the system during a
fault. Under normal conditions a system may be operating at
a 0.85 power factor (85%). When a fault occurs, much of the
system resistance is shorted out and the power factor may
drop to 25% or less. This may cause the current to become
asymmetrical. See definition of Symmetrical Current. The
UL test circuits used to test fuses with interrupting ratings
exceeding 10,000 amperes are required to have a power factor
of 20% or less. Since the power factor of test circuits tends to
vary during test procedures, actual test circuits are usually set
to a 15% power factor. The resulting asymmetrical current has
an rms value of 1.33 times the available symmetrical rms. The
instantaneous peak current of the first peak after the fault is
2.309 times the available symmetrical rms.

Relay – An electrical switch that opens and closes a
contact (or contacts) under the control of another circuit.
Typically an electromagnet.
Renewable Element (also Renewable Link) – A renewable
fuse current-carrying component that is replaced to restore
the fuse to a functional condition after the link opens due to an
overcurrent condition.
Renewable Fuse – A fuse that may be readily restored to
service by replacing the renewable element after operation.
Resistance-Grounded System – An electrical system in
which the transformer or generator neutral is connected to
ground through a current-limiting resistor. See Solidly Grounded
System, Ungrounded System.

PPE – An acronym for Personal Protective Equipment. It can
include clothing, tools, and equipment.
Primary Rating (for CTs) – The current rating of the primary
side of a current transformer. The first number in the ratio 500:5
is the primary rating. Under ideal conditions 500 A of primary
current flow through the CT will produce 5 A of current out the
secondary terminals.

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11

Restricted Approach Boundary – An approach boundary
to protect personnel from shock. A boundary distance is
established from an energized part based on system voltage.
Only qualified persons are allowed in the boundary and they
must use the proper PPE.

Prohibited Approach Boundary – An approach boundary
to protect personnel from shock. Work in this boundary
is considered the same as making direct contact with an
energized part. Only qualified persons are allowed to enter this
boundary and they must use the proper PPE.

Selective Coordination (See Figure 15) – In a selectively
coordinated system, only the protective device immediately
on the line side of an overcurrent opens. Upstream protective
devices remain closed. All other equipment remains in service,
which simplifies the identification and location of overloaded

Prospective Current – See Available Short-Circuit Current.
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TERMS AND DEFINITIONS

complete electrical cycles (0.05 seconds). However, if the
equipment is protected during the test by fuses or by a circuit
breaker with instantaneous trips, the test duration is the time
required for the overcurrent protective device to open
the circuit.

equipment or short-circuits. For additional information, refer
to the Selective Coordination pages of this Technical
Application Guide.

When protected as such during testing, the equipment
instructions and labels must indicate that the equipment
shall be protected by a given fuse class and rating or by a
specific make, type, and rating of circuit breaker. Circuit
breakers equipped with short-delay trip elements instead of
instantaneous trip elements have withstand (short-circuit)
ratings in addition to their interrupting rating. The breaker must
be able to withstand the available fault current during the time
that opening is delayed.

A

B

C

D

E

In a selective system:
For a fault at "X" only fuse "C" will open.
For a fault at "Y" only fuse "F" will open.

X

F

G

H

Solidly Grounded System – An electrical system in which

J

CURRENT FLOW

Y

In a "normal" circuit,
current is determined by
load IMPEDANCE

Semiconductor Fuse – A fuse specifically designed to protect
semiconductors such as silicon rectifiers, silicon-controlled
rectifiers, thyristors, transistors, and similar components.

LOAD

Figure 15 – Selective Coordination Example
GEN.

(Heavy lines indicate
increased current)

Shock – A trauma subjected to the body by electrical current.
When personnel come in contact with energized conductors,
it can result in current flowing through their body often causing
serious injury or death.
Short-Circuit (See Figure 16) – A current flowing outside its
normal path, caused by a breakdown of insulation or by faulty
equipment connections. In a short-circuit, current bypasses the
normal load. Current is determined by the system impedance
(AC resistance) rather than the load impedance. Short-circuit
currents may vary from fractions of an ampere to 200,000
amperes or more.

GEN.

Accidental
connection
creates fault

LOAD

Sensitive Ground-Fault Protection – Protection designed
to accurately detect extremely low ground-fault current levels
without nuisance tripping.

In a short-circuit, current is limited
only by impedance of fault path.
Current may increase to many times
load current.

Figure 16 – Current Flow in Normal and Short Circuit Situations

the neutral point of a wye connected supply transformer is
connected directly to ground.

Short-Circuit Current Rating (SCCR) – The prospective
symmetrical fault current at a nominal voltage to which an
apparatus or system is able to be connected without sustaining
damage exceeding defined acceptance criteria.

Symmetrical Current – The terms “Symmetrical Current”
and “Asymmetrical Current” describe an AC wave symmetry
around the zero axis. The current is symmetrical when the
peak currents above and below the zero axis are equal in value,
as shown in Figure 17 (next page). If the peak currents are
not equal, as shown in Figure 18, the current is considered
asymmetrical. The degree of asymmetry during a fault is
determined by the change in power factor (X/R) and the point in
the voltage wave when the fault occurs. See definition of Power
Factor. In general, lower short-circuit power factors increase the
degree of asymmetry.

Most short-circuit ratings are based on tests which last three

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11
Technical

Short-Circuit Rating – The maximum RMS symmetrical shortcircuit current at which a given piece of equipment has been
tested under specified conditions, and which, at the end of the
test is in essentially the same condition as prior to the test.
Short-circuit ratings (also called withstand ratings) apply to
equipment that will be subjected to fault currents, but which
are not required to interrupt them. This includes switches,
busway (bus duct), switchgear and switchboard structures,
motor control centers and transformers.

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TERMS AND DEFINITIONS
Symmertrical Current

Asymmertrical Current
Zero Axis

Equal
Peaks

Threshold Ratio – Consists of the threshold current divided
by the ampere rating of a specific type or class of overcurrent
Zero Axis
device. A fuse with a threshold ratio of 15 becomes currentUnequal
Peaks
limiting at 15 times its current rating.
Time-Delay Fuse – Fuses designed with an intentional, built-in
delay in opening. When compared to fast-opening fuses, timedelay fuses have an increased opening time for overcurrents
between approximately 200% and 600% of the fuse’s current
rating. Time-delay is indicated on the fuse label by “Time-Delay”,
“T-D”, “D”, or other suitable marking. Time-delay in the overload
range (200%-600% of the fuse rating) permits the fuse to
withstand system switching surges, motor starting currents, and
other harmless temporary overcurrents.

Figure 17 – Symmetrical Current

Asymmertrical Current

Zero Axis

Zero Axis

Unequal
Peaks

UL Standards require time-delay Class H, K, RK1, RK5, and J
fuses to hold 500% of their normal current rating for a minimum
of 10 seconds. They must also pass the same opening time
tests (135% and 200% of current rating) as fast acting fuses.

Figure 18 – Asymmetrical Current

Threshold Current – The minimum current for a given fuse
size and type at which the fuse becomes current-limiting. It is
the lowest value of available rms symmetrical current that will
cause the device to begin opening within the first 1/4 cycle (90
electrical degrees) and completely clear the circuit within 1/2
cycle (180 electrical degrees). The approximate threshold current
can be determined from the fuse’s peak let-through charts.
(See Figure 19.)

Time-delay Class CC, CD, G, Plug, and Miscellaneous fuses
have different requirements. For more information, please
refer to the corresponding descriptions provided in the Product
Information Section.
For the UL Standard, Class L fuses have no standard timedelay. The time-delay varies from series to series for a given
manufacturer, as well as from manufacturer to manufacturer. For
reference, Littelfuse KLPC series POWR-PRO® fuses hold 500%
of rated current for a minimum of 10 seconds.

Peak Let-Through in Amperes

B

Ungrounded System – An electrical system in which no point
in the system is intentionally grounded. This was most common
in process industries where continuity of service during a singlephase-to-ground-fault was required.
Unqualified Person – A person that does not possess
all the skills and knowledge or has not been trained for a
particular task.

Peak let-through current

4000

Voltage Rating – The maximum rms AC voltage and/or the
maximum DC voltage at which the fuse is designed to operate.
For example, fuses rated 600 volts and below may be applied
at any voltage less than their rating. There is no rule for applying
AC fuses in DC circuits such as applying the fuse at half its AC
voltage rating. Fuses used on DC circuits must have DC ratings.

Fuse approximate
threshold current = 4000A

Withstand Rating – See Short-Circuit.

1000

A

Available Fault Current Symmetrical RMS Amperes
Figure 19 – Determining Threshold Current from Peak
Let-through Chart

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Technical Application Guide

MOTOR PROTECTION TABLES
Selection of Class RK5 Fuses (FLNR_ID / FLSR_ID / IDSR Series) or POWR-PRO® Class
RK1 Fuses (LLNRK / LLSRK / LLSRK_ID Series) Based on Motor Full Load Amps
Using AC Motor Protection Tables to Select
Fuse Ratings

MOTOR RUNNING PROTECTION
(USED WITHOUT PROPERLY SIZED
OVERLOAD RELAYS)
MOTOR FULL-LOAD AMPS

Time-delay RK1 and RK5 fuse ratings selected in
accordance with the following recommendations also
meet NEC® requirements for Motor Branch circuit and
Short-Circuit Protection.

TIME DELAY
UL CLASS RK1
MOTOR SERVICE
MOTOR SERVICE
MOTOR SERVICE
MOTOR SERVICE
OR RK5 FUSE
FACTOR LESS
FACTOR LESS
FACTOR OF 1.15 OR
AMPERE RATING FACTOR OF 1.15 OR
THAN 1.15 OR
THAN 1.15 OR
GREATER OR WITH
GREATER OR WITH
WITH TEMP. RISE
WITH TEMP. RISE
TEMP. RISE NOT
TEMP. RISE NOT
GREATER
GREATER
OVER 40°C.
OVER 40°C.
THAN 40°C.
THAN 40°C

Selecting Fuses for Motor Running Protection
Based on Motor Horsepower

⁄
⁄
⁄
⁄
14
⁄
3 10
⁄
4 10
⁄
12
⁄
6 10
⁄
8 10
⁄
1 10

18
15 100
2 10

Motor horsepower and motor Full Load Amperes (FLA)
shown are taken from NEC® Tables 430.248 through
430.250 covering standard speed AC motors with normal
torque characteristics. Fuse ratings for motors with special
characteristics may need to vary from given values.

If overload relays will provide principal motor running
protection, select fuse ratings for correct type of motor
from Motor Protection Table Columns headed, “Back-up
Running Protection” or “With Overload Relays.” Fuse ratings
selected from these columns coordinate with most UL
Class 10 and 20 overload relays which covers over 90%
of motor applications.

Selecting Fuses for Motor Running Protection
Based on Motor Actual Full Load Currents

Better protection is achieved when fuse ratings are based on
motor actual FLA obtained from motor nameplates. Locate
motor nameplate FLA in the column appropriate for the
type of motor and type of protection required. Then select
the corresponding ampere rating of the fuse from the first
column of that line.

Motor Protection
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203

0.08-0.09
0.10-0.11
0.12-0.15
0.16-0.19
0.20-0.23
0.24-0.30
0.32-0.39
0.40-0.47
0.48-0.60
0.64-0.79
0.80-0.89
0.90-0.99
1.00-1.11
1.12-1.19
1.20-1.27
1.28-1.43
1.44-1.59
1.60-1.79
1.80-1.99
2.00-2.23
2.24-2.39
2.40-2.55
2.56-2.79
2.80-3.19
3.20-3.59
3.60-3.99
4.00-4.47
4.48-4.79
4.80-4.99
5.00-5.59
5.60-5.99
6.00-6.39
6.40-7.19
7.20-7.99
8.00-9.59
9.60-11.99
12.00-13.99
14.00-15.99
16.00-19.99
20.00-23.99
24.00-27.99
28.00-31.99
32.00-35.99
36.00-39.99
40.00-47.99
48.00-55.99
56.00-59.99
60.00-63.99
64.00-71.99
72.00-79.99
80.00-87.99
88.00-99.99
100.00-119.99
120.00-139.99
140.00-159.99
160.00-179.99
180.00-199.99
200.00-239.99
240.00-279.99
280.00-319.99
320.00-359.99
360.00-399.99
400.00-479.99
480.00-600.00

0.09-0.10
0.11-0.125
0.14-0.15
0.18-0.20
0.22-0.25
0.27-0.30
0.35-0.40
0.44-0.50
0.53-0.60
0.70-0.80
0.87-0.97
0.98-1.08
1.09-1.21
1.22-1.30
1.31-1.39
1.40-1.56
1.57-1.73
1.74-1.95
1.96-2.17
2.18-2.43
2.44-2.60
2.61-2.78
2.79-3.04
3.05-3.47
3.48-3.91
3.92-4.34
4.35-4.86
4.87-5.21
5.22-5.43
5.44-6.08
6.09-6.52
6.53-6.95
6.96-7.82
7.83-8.69
8.70-10.00
10.44-12.00
13.05-15.00
15.22-17.39
17.40-20.00
21.74-25.00
26.09-30.00
30.44-34.78
34.79-39.12
39.13-43.47
43.48-50.00
52.17-60.00
60.87-65.21
65.22-69.56
69.57-78.25
78.26-86.95
86.96-95.64
95.65-108.69
108.70-125.00
131.30-150.00
152.17-173.90
173.91-195.64
195.65-217.38
217.39-250.00
260.87-300.00
304.35-347.82
347.83-391.29
391.30-434.77
434.78-500.00
521.74-600.00

0-0.08
0.09-0.10
0.11-0.12
0.13-0.16
0.17-0.20
0.21-0.24
0.25-0.32
0.33-0.40
0.41-0.48
0.49-0.64
0.65-0.80
0.81-0.90
0.91-1.00
1.01-1.12
1.13-1.20
1.21-1.28
1.29-1.44
1.45-1.60
1.61-1.80
1.81-2.00
2.01-2.24
2.25-2.40
2.41-2.56
2.57-2.80
2.81-3.20
3.21-3.60
3.61-4.00
4.01-4.48
4.49-4.80
4.81-5.00
5.01-5.60
5.61-6.00
6.01-6.40
6.41-7.20
7.21-8.00
8.01-9.60
9.61-12.00
12.01-14.00
14.01-16.00
16.01-20.00
20.01-24.00
24.01-28.00
28.01-32.00
32.01-36.00
36.01-40.00
40.01-48.00
48.01-56.00
56.01-60.00
60.01-64.00
64.01-72.00
72.01-80.00
80.01-88.00
88.01-100.00
100.01-120.00
120.01-140.00
140.01-160.00
160.01-180.00
180.01-200.00
200.01-240.00
240.01-280.00
280.01-320.00
320.01-360.00
360.01-400.00
400.01-480.00

0-0.09
0.10-0.11
0.12-0.13
0.14-0.17
0.18-0.22
0.23-0.26
0.27-0.35
0.36-0.43
0.44-0.52
0.53-0.70
0.71-0.87
0.88-0.98
0.99-1.09
1.10-1.22
1.23-1.30
1.31-1.39
1.40-1.57
1.58-1.74
1.75-1.96
1.97-2.17
2.18-2.43
2.44-2.60
2.61-2.78
2.79-3.04
3.05-3.48
3.49-3.91
3.92-4.35
4.36-4.87
4.88-5.22
5.23-5.43
5.44-6.09
6.10-6.52
6.53-6.96
6.97-7.83
7.84-8.70
8.71-10.43
10.44-13.04
13.05- 15.21
15.22-17.39
17.40-21.74
21.75-26.09
26.10-30.43
30.44-37.78
37.79-39.13
39.14-43.48
43.49-52.17
52.18-60.87
60.88-65.22
65.23-69.57
69.58-78.26
78.27-86.96
86.97-95.65
95.66-108.70
108.71-130.43
130.44-152.17
152.18-173.91
173.92-195.62
195.63-217.39
217.40-260.87
260.88-304.35
304.36-347.83
347.84-391.30
391.31-434.78
434.79-521.74

littelfuse.com

11
Technical

1
11⁄ 8
11⁄ 4
14 ⁄ 10
11⁄ 2
1 6 ⁄ 10
1 8 ⁄ 10
2
2 1⁄ 4
21⁄ 2
2 8 ⁄ 10
3
3 2 ⁄ 10
3 1⁄ 2
4
4 1⁄ 2
5
5 6 ⁄ 10
6
6 1⁄ 4
7
71⁄ 2
8
9
10
12
15
17 1⁄ 2
20
25
30
35
40
45
50
60
70
75
80
90
100
110
125
150
175
200
225
250
300
350
400
450
500
600

If motor running protection will be provided by the
fuses, select fuse ratings for correct type of motor
from Motor Protection Table Columns headed,
“Without Overload Relays.”

© 2014 Littelfuse POWR-GARD® Products Catalog

BACK-UP MOTOR RUNNING
PROTECTION (USED WITH PROPERLY
SIZED OVERLOAD RELAYS)
MOTOR FULL-LOAD AMPS

Technical Application Guide

MOTOR PROTECTION TABLES
Selection of Class RK5 Fuses (FLNR_ID / FLSR_ID / IDSR Series) or POWR-PRO® Class
RK1 Fuses (LLNRK / LLSRK / LLSRK_ID Series) Based on Motor Horsepower
MOTOR
HP

FULL LOAD
AMPS

16

⁄
14
⁄
13
⁄
12
⁄
3 4
⁄
1
12
1⁄
2

4.4
5.8
7.2
9.8
13.8
16
20
24

⁄
⁄
13
⁄
12
⁄
3 4
⁄
1
11⁄2
2
3
5
71⁄ 2
10

2.2
2.9
3.6
4.9
6.9
8
10
12
17
28
40
50

⁄
⁄
1
12
1⁄
2
3
5
7 1⁄2
10
15
20
25
30
40
50
60
75
100
125
150

2.5
3.7
4.8
6.9
7.8
11
17.5
25.3
32.2
48.3
62.1
78.2
92
120
150
177
221
285
359
414

⁄
⁄
1
12
1⁄
2
3
5
7 1⁄ 2
10
15
20
25
30
40
50
60
75
100
125
150
200

2.2
3.2
4.2
6.0
6.8
9.6
15.2
22
28
42
54
68
80
104
130
154
192
248
312
360
480

16
14

12

3 4

12

3 4

120 VOLT 1-PHASE MOTORS (120V CIRCUIT)
5
5
5 6 ⁄ 10
7
6 1⁄4
7 1⁄2
9
8
9
12
10
15
15
15
17 1⁄2
20
171⁄2
20
25
20
25
30
25
30
230 VOLT 1-PHASE MOTORS (240V CIRCUIT)
12
12
2⁄
2⁄
2 8 ⁄ 10
3 1⁄ 2
3 2 ⁄ 10
4
4 1⁄ 2
4
4 1⁄2
6 10
6 10
5 ⁄
5 ⁄
6 1⁄4
8
7 1⁄2
9
10
9
10
12
10
15
15
12
15
12
20
17 ⁄
25
35
30*
35
50
45
50
60
50
70
200 VOLT 3-PHASE MOTORS (208V CIRCUIT)
8 10
3
2 ⁄
3 2 ⁄ 10
4 1⁄ 2
4
5
6
5 6 ⁄ 10
6 1⁄4
12
8
7⁄
7 1⁄2
9
8
10
12
12
15
20
20
25
30*
25*
35
40
35
45
60
50
70†
75
70
80
90
80
100
110
100*
125
150
125
150
175
150
200
200*
200*
225
250
250
300
350
300
400
400*
400*
450
500
450
600
230 VOLT 3-PHASE MOTORS (240V CIRCUIT)
2 8 ⁄ 10
2 1⁄ 2
2 8 ⁄ 10
4
3 1⁄2
4
5
4 1⁄2
5 6 ⁄ 10
12
14
7⁄
6⁄
7 1⁄2
8
7 1⁄2
9
12
10
12
17 1⁄2
17 1⁄2
20
25
25
30
35
30*
35
50
45
60
60*
60*
70
80
75
90
100
90
100
125
110
150
150
150
175
175
175
200
225
200*
250
300
250
350
350
350
400
450
400*
450
600
500
600

5 6 ⁄ 10
7
9
12
17 1⁄2
20
25
30

30
30
30
30
30
30
30
30

2 8 ⁄ 10
3 1⁄ 2
41⁄2
6
8
10
12
15
20
35
50
60

30
30
30
30
30
30
30
30
30
60
60
60

3
4 1⁄2
6
8
9
15
25
30*
40
60
75
90
110
150
175
225
300
350
450
500

30
30
30
30
30
30
30
60
60
60
100
100
200
200
200
400
400
400
600
600

2 8 ⁄ 10
4
5
71⁄2
8
12
17 1⁄2
30
35
50
70
80
100
125
150
200
225
300
400
450
600

30
30
30
30
30
30
30
30
60
60
100
100
100
200
200
200
400
400
400
600
600

MOTOR
HP

FULL LOAD
AMPS

12

⁄
3 4
⁄
1
11⁄2
2
3
5
71⁄2
10
15
20
25
30
40
50
60
75
100
125
150
200

1.1
1.6
2.1
3.0
3.4
4.8
7.6
11
14
21
27
34
40
54
65
77
96
124
156
180
240

⁄
⁄
1
11⁄2
2
3
5
7 1⁄2
10
15
20
25
30
40
50
60
75
100
125
150
200

0.9
1.3
1.7
2.4
2.7
3.9
6.1
9
11
17
22
27
32
41
52
62
77
99
125
144
192

12

3 4

WITHOUT OVERLOAD
WITH OVERLOAD RELAYS
RELAYS
S.F. = LESS
S.F. = LESS SWITCH OR
S.F. = 1.15 OR
S.F. = 1.15 OR
THAN 1.15 OR
THAN 1.15 OR FUSE CLIP
MORE, TEMP
MORE, TEMP
TEMP RISE
TEMP RISE
RATING
RISE NOT
RISE NOT
MORE THAN
MORE THAN
OVER 40°C
OVER 40°C
40°C
40°C

460 VOLT 3-PHASE MOTORS (480V CIRCUIT)
14 ⁄ 10
11⁄4
14 ⁄ 10
2
18 ⁄ 10
2
2 1⁄2
21⁄4
2 8 ⁄ 10
3 1⁄2
3 2 ⁄ 10
4
4
3 1⁄2
4 1⁄2
6 10
5 ⁄
5
6
9
8
10
12
12
15
171⁄2
15
17 1⁄2
25
20
30
30*
30*
35
40
35
45
50
45
50
60*
60*
70
80
70
90
90
80
100
110
110
125
150
125
175
175
175
200
225
200*
225
300
250
300
575 VOLT 3-PHASE MOTORS (600V CIRCUIT)
11⁄8
1
11⁄8
16 ⁄ 10
14 ⁄ 10
16 ⁄ 10
2
18 ⁄ 10
2 1⁄4
3
2 1⁄2
3
3 2 ⁄ 10
2 8 ⁄ 10
31⁄2
4 1⁄2
4
5
7 1⁄2
7
8
10
10
12
12
12
15
20
17 1⁄2
25
25
25
30
30*
30*
35
40
35
40
50
45
60
60
60
70†
75
70
80
90
80
100
110
110
125
150
125
175
175
150
200
225
200*
250

14 ⁄ 10
2
2 1⁄2
3 1⁄2
4
5 6 ⁄ 10
9
15
17 1⁄2
25
35
40
50
60*
75
90
125
150
200
225
300

30
30
30
30
30
30
30
30
30
30
60
60
60
100
100
100
200
200
200
400
400

11⁄8
16 ⁄ 10
2
3
3 2 ⁄ 10
41⁄2
7 1⁄2
12
15
20
30
35
40
50
60
75
90
125
150
175
225

30
30
30
30
30
30
30
30
30
30
30
60
60
60
60
100
100
200
200
200
400

NOTES
S.F. = Motor Service Factor
* Fuse Reducers Required
† 100 Amp Switch Required

Motor Protection
White Paper
Download our white paper
on motor protection at
littelfuse.com/technicalcenter

Technical

11

WITHOUT OVERLOAD
WITH OVERLOAD RELAYS
RELAYS
S.F. = LESS
S.F. = LESS SWITCH OR
S.F. = 1.15 OR
S.F. = 1.15 OR
THAN 1.15 OR
THAN 1.15 OR FUSE CLIP
MORE, TEMP
MORE, TEMP
TEMP RISE
TEMP RISE
RATING
RISE NOT
RISE NOT
MORE THAN
MORE THAN
OVER 40°C
OVER 40°C
40°C
40°C

littelfuse.com

204

© 2014 Littelfuse POWR-GARD® Products Catalog

Technical Application Guide

MOTOR PROTECTION TABLES
Selection of POWR-PRO® Class J Fuses (JTD_ID / JTD Series)
Based on Motor Full Load Amps
MOTOR F.L.A.

JTD_ID / JTD
AMPERE RATING

0.00 – 0.60
0.61 – 0.80
0.81 – 1.00
1.01 – 1.20
1.21 – 1.65
1.66 – 2.00
2.01 – 2.40
2.41 – 3.30
3.31 – 4.10
4.11 – 4.90
4.91 – 6.40
6.41 – 8.00
8.01 – 9.80
9.81 – 12.0

8

⁄ 10

1
11⁄4
1 1⁄2
2
2 1⁄2
3
4
5
6
8
10
12
15

MOTOR F.L.A.

JTD_ID / JTD
AMPERE RATING

MOTOR F.L.A.

JTD_ID / JTD
AMPERE RATING

12.1 – 14.5
14.6 – 17.0
17.1 – 21.0
21.1 – 25.0
25.1 – 28.5
28.6 – 34.0
34.1 – 37.0
37.1 – 41.0
41.1 – 48.0
48.1 – 52.0
52.1 – 59.0
59.1 – 66.0
66.1 – 76.0

17 1 /2
20
25
30
35
40
45
50
60
70
80
90
100

76.1 – 84.0
84.1 – 90.0
90.1 – 102
103 – 125
126 – 144
145 – 162
163 – 180
181 – 204
205 – 240
241 – 288
289 – 312
313 – 360
361 – 432

110
125
150
175
200
225
250
300
350
400
450
500
600

NOTE: For severe motor starting conditions, fuses may be sized up to 225% motor F.L.A. (See NEC ® Article 430.52 for Exceptions)

Selection of CCMR Time-Delay Fuses Based on Motor Full Load Amps
MOTOR FULL LOAD CURRENT (F.L.A.)
FOR MOTORS WITH AN ACCELERATION
TIME OF 2 SECONDS OR LESS
MIN. F.L.A. (1)
0.2
0.3
0.4
0.5
0.6
0.8
0.9
1.1
1.2
1.5
1.8
2.1
2.3
2.6
2.9
3.3
3.5
3.6
4.1
4.3
4.6
5.2
5.8
6.9
8.9
11.5
14.3
20.7
23.7
26.6
30.0
35.5

MAX F.L.A. (3)
0.2
0.4
0.6
0.7
1.0
1.1
1.3
1.4
2.1
2.6
3.0
3.4
3.9
4.3
4.8
5.2
5.4
5.7
5.8
6.2
6.9
7.7
8.9
10.0
13.5
15.8
17.8
23.3
26.7
30.0
33.3
40.0

FOR MOTORS WITH AN ACCELERATION
TIME OF 5 SECONDS OR LESS
MIN. F.L.A. (1)
0.2
0.3
0.4
0.5
0.6
0.8
0.9
1.1
1.2
1.5
1.8
2.1
2.3
2.6
2.9
3.3
3.5
3.6
4.1
4.3
4.6
5.2
5.8
6.9
8.9
11.2 (2)
13.4 (2)
16.1
18.4
20.7
23.0
27.6

MAX F.L.A. (3)
0.2
0.4
0.5
0.6
0.9
1.0
1.1
1.2
2.1
2.6
3.0
3.2
3.3
3.4
3.7
4.0
4.1
4.2
4.3
4.6
5.2
5.8
6.6
7.7
10.0
11.8
13.4
17.9
20.5
23.1
25.6
30.1

1 	 Based on NEC ® requirement limiting the rating of time-delay fuses to 175% of motor
F.L.A., or next higher rating.
2 	 Based on NEC ® exception permitting fuse rating to be increased, but not to exceed,
225% motor F.L.A., however per NEC ® Article 430.52 Class CC (0-30) fuses can now be
sized up to 400% of motor F.L.A.
3 	 Based on Littelfuse CCMR time-delay characteristics.

FOR MOTORS WITH AN ACCELERATION
TIME OF 8 SECONDS OR LESS
MIN F.L.A. (2)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.2
1.4
1.6
1.8
2.0
2.3
2.5
2.7
2.8
3.2
3.4
3.6
4.0
4.5
5.4
6.7
6.8
9.0
10.0
15.6
17.8
20.0
22.3
26.7

CCMR
AMPERE RATING

MAX F.L.A. (3)
0.2
0.3
0.5
0.6
0.8
0.9
1.0
1.1
1.8
2.3
2.6
2.8
2.8
2.8
3.1
3.4
3.5
3.7
3.8
4.2
4.5
4.9
5.5
6.7
9.0
11.0
15.0
15.9
18.2
20.4
22.7
27.3

⁄
⁄
⁄

3 10
12
8 10

1
11⁄4
1 1⁄2
18 ⁄ 10
2
21⁄2
3
3 1⁄2
4
4 1⁄2
5
5 6 ⁄ 10
6
6 1⁄4
7
71⁄2
8
9
10
12
15
20
25
30
35
40
45
50
60

NOTE: These values were calculated for motors with Locked Rotor
Current (LRA), not exceeding the following values:
MOTOR F.L.A.

850%
750%
650%
600%

*If motor LRA varies from these values, contact Littelfuse.
© 2014 Littelfuse POWR-GARD® Products Catalog

205

littelfuse.com

11
Technical

0.00 – 1.00
1.01 – 2.00
2.01 – 10.0
10.1 – 17.8

*LRA

Technical Application Guide

ALPHANUMERIC INDEX

Technical

11

Product Name

Page Number

Product Name

Page Number

Product Name

Page Number

97023
150322
1LFS, 1LS Series
215 Series
216 Series
217 Series
218 Series
224 Series
225 Series
229 Series
230 Series
235 Series
239 Series
251 Series
273 Series
287 Series
297 Series
299 Series
312 Series
313 Series
314 Series
315 Series
318 Series
324 Series
325 Series
326 Series
342 Series
345 Series
354 Series
451 Series
477 Series
481 Series
505 Series
571 Series
572 Series
70 Series
Alarm Monitoring
Arc-Flash
ATO Series
BLF Series
BLN Series
BLS Series
Box Cover Units
Bus Bar Series
BVSP Series
C6200
Cable Limiters
CCMR Series
Class CC
Class CD
Class G
Class J
Class K5
Class L

115
131
121
35
35
35
35
34
34
34
34
35
35
33
33
36
36
36
34
34
34
34
34
34
34
34
118
119
114
33
33
53
33
117
117
53
168
157
36
30
30
31
179
112
176
166
65
27
27
27
26
21
20
8

Class RK1
Class RK5
Class T
CNL Series
CNN / CNN_E Series
Coordination Panels
Cylindrical Fuses
D0900
Definitions
Displays
Distribution Blocks
E-Rated Fuses
E5000
E7800
EL731
Electronic Fuses
Engine Controls/Diagnosis
EngineEye
FBDIN1
Feeder Protection
FLA Series
FlexGen
FLM Series
FLNR Series
FLNR_ID Series
FLQ Series
FLSR Series
FLSR_ID Series
FLU Series
Fork-Lift Fuses
FPS
FPU-32
FRCK Series
Fuse Blocks, Fuse Holders
Fuse Classifications
Fuse Reducers
Fuseology
G2000
G3000
G3300
GDB Series
Generator Protection/Control
GFP
Ground-Fault Protection
H4000
HAZGARD™
IDSR Series
In-Line Fuse Holders
Industrial Shock-Block
JCASE Series
JLLN Series
JLLS Series
JLS Series
JTD/JTD_ID Series

13
16
24
62
62
138
66
157
198
181
122
42
167
164
150
32
167
167
104
156
31
166
30
17
17
30
17
17
31
62
156
156
180
82
194
178
183
158
158
159
128
158
115
143
169
62
16
131
157
37
24
24
22
21

KLC Series
KLDR Series
KLK Series
KLKD Series
KLKR Series
KLLU Series
KLNR Series
KLPC Series
KLQ Series
KLSR Series
L15S Series
L17T Series
L25S Series
L50S Series
L60030C, L60030M Series
L60030MPCB
L60S Series
L70S Series
LA100P Series
LA15QS Series
LA30QS Series
LA50QS Series
LA60Q Series
LA70QS Series
LA70QSF Series
LAxxxURD Series
LCC Series
LCP Series
LD Series
LDC Series
LEB Series
LEC Series
LET Series
LEX Series
LEX YY Series
LEXT YY Series
LEY Series
LF Series Covers
LFC600
LFCL Series
LFFB003
LFG480, LFG600 Series
LFH250, LFH600 Series
LFJ 1000V Series
LFJ600 Series
LFPHV
LFPSC
LFPSJ
LFR250, LFR600 Series
LFT300, LFT600 Series
LGR Series
LHFB
LHR Series
Live Parts

69
28
30
30
28
9
15
8
31
15
69
50
69
69
101
103
69
69
76
71
72
73
74
75
74
77
115
139
122
10
132
132
132
132
136
136
132
105
101
65
116
99
88
107
85
109
110
111
88
94
64
116
64
48

littelfuse.com

206

© 2014 Littelfuse POWR-GARD® Products Catalog

Technical Application Guide

ALPHANUMERIC INDEX
Product Name

Page Number

Product Name

Page Number

Product Name

Page Number

LLNRK Series
LLSRK/ LLSRK_ID Series
LMF Series
LPBC Series
LPFP
LPS
LPSM-QC
LPXV Series
LRU Series
LS Series
LSCR Series
LSCY
LSKA
LSOU
LSOW
LSOX
LSOY
LSOY-B
LSRU
LSRW
LSRX
LSRY
LSSU
LSSW
LSSX
LSSY
LSTY
LTFD Series
LVSP Series
M1000
M2000
M2500
M3000
M4200
M4500
M4600
M4700
M8100
MAXI Series
Medium Voltage
MEGA Series
MFP
Midget Fuses
MINI Series
Motor Protection
MOV
MPS
MPU-32
MROplus
NLKP Series
NLN Series
NLS Series
OEM Products
Overvoltage Suppression

13
13
64
122
115
141
113
106
178
122
120
179
179
179
179
179
179
179
179
179
179
179
179
179
179
179
179
54
175
168
167
167
168
168
169
169
169
165
36
39
63
115
30
36
154
174
155
155
3
20
20
20
67
173

Panel Mount Adapters
PGN-1000
PGN-3000
PGR-3100
PGR-3200
PGR-4300
PGR-6100
PGR-6130
PGR-6150
PGR-6800
PGR-8800
Plug Fuses
Potential Transformer
POWR-PRO® Fuses
Pre-Engineered Solutions
Protection Relays
Pump Protection
R-Rated Fuses
Resistance Grounding
S6000
SB6100
SE-105
SE-107
SE-134C
SE-145
SE-325
SE-330
SE-330AU
SE-502
SE-601
SE-701
SE-703
SE-704
Semiconductor Fuses
Sigma
SLC Series
Solar Fuses
SPF Series
SPFI Series
SPFJ Series
SPL001
Splicer Blocks
SPXI Series
SPXV Series
Stud-Mounted Fuse Blocks
Suppression Products
T2000
T2100
T2200
T2300
T2400
T2500
T2600
T2700

171
153
153
148
148
158
154
154
154
156
157
63
47
3
138
143
156
40
151
166
157
151
151
151
151
152
152
152
153
148
149
149
149
68
166
26
56
60
59
61
104
122
58
57
120
172
158
159
160
160
160
161
163
161

T2800
T2900
T3000
T3100
T3200
T3300
T4500
T4800
T4900
T5000
T7900
T8400
Technical Information
Telecom Fuses
TLN Series
TLO Series
TLS Series
TMOV
TOO Series
Trailing Cable Protection
Varistors
WPB Series

150
161
162
162
150
162
163
163
164
164
165
165
182
49
51
63
52
174
63
148
174
133

207

Technical

© 2014 Littelfuse POWR-GARD® Products Catalog

11

littelfuse.com

Technical Application Guide

CONDENSED CROSS REFERENCE
Power (Electrical) and Electronic Fuses
This cross reference covers the most popular fuses for which there is a similar Littelfuse standard item. Furnished for your
convenience, it is meant to serve as a guide only for product selection. We suggest you check all applicable specifications before
making substitutions. For special applications, more complete information, and for fuse block and medium voltage fuse cross
referencing, visit littelfuse.com or call 1-800-TEC-FUSE (1-800-832-3873).
COMPETITION

Technical

11

10KOTN
10KOTS
50KOTN
50KOTS
A
A013F
A015F
A015R
A025F
A050F
A060F
A060URL
A070F
A13X
A25X
A2D-R
A2K-R
A3T
A4BQ
A4BT
A4BY
A4J
A50P (type 1 & 4)
A60X
A6D-R
A6K-R
A6T
A70P
ACK
AG
AGA
AGC
AGU (1-30A)
AGW
AJT
ANL
ANN
ATC
AT-DE
ATDR
ATM (Ferraz)
ATMR
ATQ
ATQR
AX
BAF
BAN
BBS
CJ
CJS
CLF
CLL
CLU
CM
CMF
CNM

littelfuse.com

LITTELFUSE
NLN
NLS
NLN
NLS
251
L15S
L15S
L15S
L25S
L50S
L60S
KLK
L70S
L15S
L25S (AC only)
LLNRK
KLNR
JLLN
KLPC
KLLU or KLPC
KLPC or KLLU
JLS
L50S
L60S
LLSRK_ID 4
KLSR
JLLS
L70S
CCK
SLC
AGA
312
BLN
AGW
JTD_ID
CNL
CNN
ATO (257)
FLNR_ID 3
CCMR
KLKD
KLKR
FLQ
KLDR
481
BLF
BLN
BLS
JLS
JLS
KLPC or KLLU
KLLU or KLPC
KLLU or KLPC
BLF
BLN
FLM

COMPETITION
CNQ
CRN-R
CRS-R
CSF13X
CSF25X
CSF50P
CSF60C
CSF60X
CSF70P
CTN-R
CTS-R
EBS
ECNR
ECSR
ELN
ELS
ERN
ERS
FNA
FNB
FNM
FNQ
FNQ-R
FRN-R
FRS-R
FWA 2
FWH2
FWP1
FWX1
GDA
GDB
GDC
GDL
GEB
GEBN
GFA
GFN
GGC
GGM
GLR
GMT
HCLR
HCTR
HEB
HET
HLR
J
JDL
JFL
JHC
JJN
JJS
JKS
KAA
KAB
KAC

LITTELFUSE
FLQ
FLNR_ID 3
FLSR_ID
L15S
L25S (AC only)
L50S
KLC (AC only)
L60S (AC only)
L70S
KLNR
KLSR
BLS
FLNR_ID 3
FLSR_ID
FLNR or LLNRK 5
FLSR or LLSRK 5
FLNR or LLNRK 5
FLSR or LLSRK 5
FLA
235
FLM
FLQ
KLDR
FLNR_ID 3
FLSR_ID
L15S
L50S
L70S
L25S
216
217
218
313
LEB
LET
251
FLA
312
235
LGR
481
KLKR
KLDR
LEB
LET
LHR
JLS
JTD_ID
JLS
JTD_ID
JLLN
JLLS
JLS
L15S
L25S
KLC

COMPETITION
KBH
KLM
KLMR
KLU
KN
KON
KOS
KRPC (SP)
KRPC-L
KS
KTK
KTKR
KTNR
KTSR
KTU
L
LCL
LCU
LENRK
LESRK
LKN
LKS
LKU
LONRK
LOSRK
LPCC
LPJ (SP)
LPNRK (SP)
LPSRK (SP)
MCL
MDA
MDL
MDQ
MDV
MDX
MEN
MEQ
MID
MOF
MOL
MTH
NCLR
NON
NOS

LITTELFUSE
L50S
KLKD
CCMR
KLLU or KLPC
KLNR
NLN
NLS
KLPC
KLPC
KLSR
KLK
KLKR
KLNR
KLSR
KLPC or LDC
KLLU or KLPC
KLPC or KLLU
KLPC or KLLU
LLNRK
LLSRK_ID
FLNR or LLNRK 5
FLSR or LLSRK 5
KLLU
LLNRK
LLSRK_ID
CCMR
JTD_ID
LLNRK
LLSRK_ID4
KLK
326
313
313
315
313
FLM
FLQ
FLA
BLN
BLF
312
KLNR
NLN
NLS

COMPETITION
NRN
NRN (15-60A)
NRS
OT
OTM
OTN
OTS
REN
RES
RF
RFA
RFC
RFL (750V)
RFN (Ferraz)
RFS (Ferraz)
RFV
RHN
RHS
RLN (Ferraz)
RLS (Ferraz)
S
SA
SC
SCLR
SEC
SF13X
SF25X
SF50P
SF60X
SF70P
SFE
SL
T
TJN
TJS
TL
TR
TRM
TRN-R
TRS
TRS-R
XL25X
XL50F
XL70F

LITTELFUSE
NLN
NLKP
NLS
NLN
BLF or BLN
NLN
NLS
FLNR or LLNRK 5
FLSR or LLSRK 5
FLNR or LLNRK 5
L15S
KLC
L70S (700 V)
FLNR or LLNRK 5
FLSR or LLSRK 5
L50S
KLNR
KLSR
FLNR or LLNRK 5
FLSR or LLSRK 5
SOO
SAO
SLC
KLSR
SLC
L15S
L25S
L50S
L60S
L70S
SFE
SLO
TOO
JLLN
JLLS
TLO
FLNR_ID 3
FLM
FLNR_ID 3
FLSR_ID
FLSR_ID 4
L25S
L50S1
L70S1

1) Check specific mounting dimensions before substituting.
2) Check fuse characteristics and mounting dimensions for specific application before substituting.
3) For 1/10 - 30 amperes, order non-indicating FLNR series fuses.
4) Verify voltage for DC applications.
5) Littelfuse has discontinued Class H fuses and recommends upgrading to RK1 or RK5 Class fuses.
A fuse may be used in circuits where the fuse’s voltage rating is equal to or greater than the circuit
voltage, unless otherwise stated on the fuse. For example, the FLSR_ID indicating fuse has a
voltage rating of 75-600 volts. This fuse can be used on 600 volts, 480 volts, 250 volts, 125 volts, or
75 volts. Never use a fuse in a circuit having a higher rated voltage than the fuse.

208

© 2014 Littelfuse POWR-GARD® Products Catalog

Additional Resources
Littelfuse is in the App Store!

Experienced Technical Professionals

Our free Littelfuse Catalogs and Literature
App keeps our products and resources at
your finger tips, wherever you are. Find the
information you need, quickly and easily!

For additional questions, call or email
the Littelfuse Technical Support and
Engineering Service Group at
1-800-TEC-FUSE or techline@littelfuse.com.

White Papers and Additional Technical Information
Littelfuse is committed to developing technical resources that help improve electrical safety and product knowledge.
Gain access to Technical Application Guides, White Papers, and a library of information at littelfuse.com/technicalcenter.

Motor Protection

SCCR

Effective motor protection is critical in today’s highly
®
automated industrial facilities. POWR-GARD fuses
and protection relays provide optimum protection
for motors in main, feeder, and branch circuits.

The NEC requires Industrial Control Panels be labeled
with their Short-Circuit Current Rating so users and
inspectors can compare their equipment to available
fault currents to avoid potential hazards.

Transformer Protection

Arc-Flash Protection

POWR-GARD fuses provide optimal overcurrent
protection for both the primary and secondary of
control transformers and other regular transformers
above and below 600 volts.

Arc-flash protection relays are intelligent controllers
that safeguard equipment and personnel to prevent
damage, downtime or injury due to arc flash.

Medium Voltage Fuse Protection

Overvoltage Suppression Basics

POWR-GARD medium voltage fuses provide
short-circuit protection for motors and
transformers rated 2,400 to 38,000 Vac.

Overvoltage conditions are an increasing concern
in the electrical industry. Littelfuse has a diverse
portfolio of circuit protection technologies to protect
against voltage transients in multiple applications.

®

Need more information about
Littelfuse® POWR-GARD® products?
Littelfuse publishes technical resources to help enhance the productivity
and safety of electrical systems. To learn more about a specific product or
application, visit our extensive online library at littelfuse.com
nn Extended Datasheets
nn Time-Current Curves
nn Peak Let-Thru Curves

POWR-GARD PRODUCTS CATALOG

nn White Papers
nn CAD Drawings
nn 3D Models

®

nn Certifications
nn Cross References

WWW.LITTELFUSE.COM
Littelfuse Electrical Product Portfolio Includes:

FUSES

Industrial

A Full Line of Catalogs:
Protection Relays & Controls Catalog (PF130N)
The comprehensive line of electronic and microprocessor-based protection
relays safeguard equipment and personnel to prevent expensive damage,
downtime or injury due to electrical faults.
®

POWR-GARD Solar Catalog (PF140N)
POWR-GARD Solar Products are designed specifically for photovoltaic
applications where issues such as heat, efficiency, longevity and global
standards impact the choices in selecting circuit protection.

SymCom/SSAC Catalogs
SymCom and SSAC are leaders in electronic control and protection for all types
and sizes of motors, pumps, timers and flashers used in many applications.
To view all Littelfuse product catalogs, visit our website at littelfuse.com/Catalogs

©2014 Littelfuse, Inc. Printed in USA.
Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication,
but are subject to changes without notice. Visit littelfuse.com for the most up-to-date technical information.

Form: PF101N
Rev: 5-A-060114



---

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