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POWR-GARD™ PRODUCTS CATALOG

An Exceptional Portfolio

Makes All the Difference

When you work with Littelfuse, you are working with the broadest

and deepest circuit protection portfolio available. We leverage

7 different technologies, giving you access to an unparalleled

selection – helping you find the right solution for your application.

• Fuses, Holders & Accessories

• PTCs

• GDTs

• SIDACtors®

• Varistors

• Diodes

• Polymer ESD devices

Commitment to Circuit Protection

For over 75 years Littelfuse has maintained its focus on

circuit protection. As we expand in global reach and technical

sophistication, you can continue to count on us for solid circuit

protection solutions, innovative technologies, and industry-leading

expertise. It is a commitment that only a world-class leader with

staying power can support.

Littelfuse®

The World’s Leading Provider of Circuit Protection Solutions

www.littelfuse.com

Littelfuse is committed to providing every one of our customers

with the right solutions to meet all of your circuit protection needs.

That is why we carry the broadest range of technologies available

on the market today.

The breadth of our offering, combined with our depth of product

and application expertise, gives us the freedom to provide

objective, comprehensive solutions to meet the specific needs

of each application. This allows for a true partnership with

our customers.

The Industries We Serve

Solutions from Littelfuse can be found in virtually every application

that uses electrical energy, including:

• Automotive applications

• Digital consumer electronics

• Industrial/Electrical applications

• Telecom/Datacom circuits

Contents

POWR-PRO® Fuses 3

Indicator ® Introduction 4

Global Pro

™ Introduction 5

MROplus

™ 6

POWR-PRO ® In tro duc tion 7

KLPC 8-10

LLS RK_ID 11 - 13

LLNRK, LLSRK 14-16

JTD_ID 17-19

CCMR 20-21

IDSR 22

LDC 23-24

General Purpose Fuses 25

KLLU 26-28

FLNR_ID/FLSR_ID 29-32

FLNR/FLSR 33

KLNR/KLSR 34-35

NLN/NLS 36-37

RLN/RLS 38

JLS 39-40

JLLN/JLLS 41-43

SLC 44

CCMR, KLDR, KLKR 45-47

Plug Fuses 48

Midget & Electronic Fuses 49

Midget Fuses 50-54

Electronic Fuses

3AG/3AB 55

Indicating 56

5x20 mm IEC Type 57

5x20 mm & 2AG 58

Sub min ia ture 59

Automotive Fuses

SFE & Blade Type 60

Bolt-on Type 61

Miscellaneous Types 62

Medium Voltage Fuses 63

Medium Voltage Fuses 64-75

Telecom Products 76

L17T 77

TLN 78

TLS 79

70 Series 80

481 Series 80

LTFD 101 81

LTFD 6 0 01 82

LTFD 12 0 0 82

Special Purpose Fuses 83

Semiconductor Fuses 84-106

Fork-Lift Fuses 107

Cable Limiters 108

LMF, LGR, LHR 109

Blocks & Holders 110

Class H/K5 & R 111-116

Clas s J 117-119

Class T 120-123

Class G 124

Class CC & Midget 125-126

Class CC & Midget Accessories 127

POWR-SAFE Fuseholders 128-129

POWR-Covers 130

Pullers, POWR-JAW 131

571 Fuseholder 132

LFFB Limiter Block 133

LHFB Inline 3AG Holder 133

Semiconductor Blocks 134-136

POWR-BLOKS™

Distribution/Splicer 137-141

Dimensions 142-144

In-Line Watertight Fuseholders 145-150

Miscellaneous Products 151

POWR-Switch and LPMP Panel 152-155

Disconnect Switches 156

Fuse Reducers 157

Box Covers 158-159

Fuse Cabinet, Display 160

International Products 161

Global Pro Fuses 162

Global Pro Fuseholders 163

NH Fuse Links 164-165

Diazed/Neozed Fuse 166-167

Cylindrical Fuses 168

British Dimension 169

Overvoltage Suppression Products 170

Introduction 171-172

Industrial Varistor Products 173

LVSP 174

Fuseology 175

Terms and Definitions 177-181

Electrical Safety 182-183

Fuse Application Guide 184-203

Motor Protection Tables 204-206

Condensed Cross Reference 207

Alphanumeric Index 208

POWR-PRO® Fuses

www.littelfuse.com

POWR-PRO® Fuses

* LDC and IDSR are rated 600 volts AC/DC.

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

UL Class Fuse Overload

Characteristics

Interrupting

Rating, Amperes AC Voltage Rating Available Ampere

Ratings

Littelfuse Series

Number Page Number

LTime-Delay 200,000

300,000** 600

200 – 6000

601 – 4000

150 – 2000

KLPC**

KLLU

LDC*

8-10

26-28

23-24

RK1

Time-Delay 200,000

300,000**

250

600

1/10 – 600

LLNRK**

LLSRK**

LLSRK_ID**

14-16

11-13

Fast-Acting 200,000 250

600 1 – 600 KLNR

KLSR 34-35

RK5 Time-Delay 200,000

300,000**

250

600

1/10 – 600

FLNR/FLNR_ID**

FLSR/FLSR_ID**

IDSR**,*

29-32

TFast-Acting 200,000 300

600 1 – 1200 JLLN

JLLS 41-43

JTime-Delay 200,000/300,000** 600 8/10 – 600 JTD/JTD_ID** 17-19

Fast-Acting 200,000 600 1 – 600 JLS 39-40

CC Time-Delay 200,000

300,000** 600 1/10 – 30

2/10 – 30

KLDR

CCMR**

45-47

20-21

Fast-Acting 200,000 600 1/10 – 30 KLKR 45-47

CD Time-Delay 200,000/300,000** 600 35 – 60 CCMR** 20-21

GTime-Lag 100,000 600

480

1/2 – 20

25 – 60

SLC

SLC 44

K5 “One-Time” Fuses

Fast-Acting 50,000 250

600

1 – 600

NLN

NLS 36-37

Renewable Fuses

Fast-Acting

Time-Delay

10,000 250

600

1 – 600

RLN

RLS 38

Plug Time-Delay 10,000 125 1/4 – 30 SOO, TOO 48

Medium Time-Delay 10,000 125 15 – 30 SLO, TLO 48

Supplementary

Midget Fuses

Electronic Fuses

Automotive Fuses

Varies 32 to 1000

1/10 – 30

1/500 – 30

1-250

See Product Listings

50-54

55-59

60-62

Telecommunications Fast-Acting 100,000 170VDC

70 – 1200

1 – 600

1 – 70

L17T

TLN

TLS

www.littelfuse.com

POWR-PRO® Fuses

Littelfuse Indicator® Fuses 4

Littelfuse Global Pro™ System 5

Littelfuse MROplus™ 6

Littelfuse POWR-PRO System 7

KLPC Series POWR-PRO Class L Fuses 8-10

LLSRK_ID Series Indicator POWR-PRO Class RK1 Fuses 11-13

LLNRK/LLSRK Series POWR-PRO Class RK1 Fuses 14-16

JTD_ID Series Indicator POWR-PRO Class J Fuses 17-19

CCMR Series POWR-PRO Class CC and CD Fuses 20-21

IDSR Series Indicator POWR-PRO Class RK5 Fuses 22

LDC Series POWR-PRO Class L Fuses 23-24

POWR-PRO® Fuses

Littelfuse Indicator® Fuses

LLSRK_ID see pages 11-13

• Class RK1

• 600 VAC

• Dual-El e ment, Time-Delay

• 1/10-600 Amperes

FLNR_ID/FLSR_ID see pages 29-32

• Class RK5

• 250/600 VAC

• Dual-El e ment, Time-Delay

• 1/10-600 Amperes

IDSR see page 22

• Class RK5

• 600 V AC/DC

• Dual-El e ment, Time-Delay

• 1/10-600 Amperes

JTD_ID see pages 17-19

• Class J

• 600 VAC

• Dual-Element, Time-Delay

• 8/10-600 Amperes

313_ID see page 56

• Electronic 3AG

• 125/32 VAC

• Slo-Blo®

• 1/2-10 Amperes

Good

Blown

Indicator fuses combat one of the most com mon and frustrating

obstacles to productivity: downtime. Every time a fuse opens and

production stops, money is wasted. Locating a blown fuse used to take

20 min utes or more. Blown Littelfuse Indicator fuses can be spotted

quickly and safely, while the power is turned off.

Now it couldn’t be easier to locate the blown fuse. Simply look at the

Indicator window. When the fuse blows, the window turns from clear

to dark instantly, indicating which fuse needs to be replaced without

headaches or hassles.

These technologically advanced fuses feature solid-state designs that

improve overall performance and in crease fuse life. When properly

applied, Indicator fuses provide superior protection and improved time-

delay over conventional fuse designs. The patented solid-state overload

section provides consistent and reliable op er a tion by eliminating moving

parts which are subject to fatigue. This provides longer fuse life by

eliminating needless fuse openings due to motor inrush currents. The

superior performance allows you to consolidate your inventories by

replacing older, con ven tion al fuses which have limited per for mance

characteristics.

• Re duce Downtime

• Re duce Nuisance Opening

• Re duce Fuse In ven to ry

• Reduce Equipment Dam age

• Reduce Accidents

• Reduce Housekeeping Headaches

The Indicator® Solution Software

Complete Circuit Protection Plus Time Saving Indication.

This easy to use software analyzes your plant

operations and calculates six areas of cost savings

when you use Indicator fuses.

To calculate your savings, call 1-800-TEC-FUSE

for a free copy of the Indicator Solution software.

Use Indicator fuses and you can:

POWR-PRO® Fuses

www.littelfuse.com

Introducing the Global Pro System

Offering World Class Performance and Global Acceptance

The International Challenge

Engineers and equipment designers are faced with a dilemma when

choosing the right circuit protection for their globally distributed

equipment. They need to worry about which markets the product

will be used in, what appropriate electrical standards apply in each

of those markets, and what fuses should be used so that users can

find replacements easily. These can be daunting questions particularly

because some of this information often is not available to the engineer

when a particular piece of equipment is being designed.

The Global Pro system resolves these design issues by incorporating

North American standards to fit internationally accepted IEC fuse

dimensions. This allows use of touchsafe fuseholders that can be used

in virtually any market and permits equipment to be easily adapted by

simply replacing the fuse with one that meets local standards. It’s that

simple.

The benefits of the Global Pro system include:

• Global acceptance

• UL and IEC approval

• Universal voltages

• Touch-safe components

• Integrated lockout/tagout device for compliance

• Pin-indication

• Design versatility for OEMs

Global Acceptance – Total Protection

The Littelfuse Global Pro circuit protection system combines fuses, fuse

holders and fusible disconnect switches in a simple, integrated package

designed to comply with UL and IEC requirements. The result is the

single best solution for your worldwide circuit protection needs. No

matter where your product is used, Global Pro will be accepted. More

significantly, it’s easy too! It meets universal voltage standards, offers

universal fuse sizes and uses universally understood product labels and

part numbers.

Flexible Components

The components of the Global Pro system are vital to its revolutionary

performance, and the key component within the system is the fuse. The

Littelfuse Global Fuse is designed to offer UL Class J performance, but

with the compact size and the international compatibility associated with

fuses manufactured to IEC dimensions.

More Protection In Less Space

Littelfuse Global Pro fuses are significantly smaller in size than 30 amp,

60 amp, and 100 amp Class J fuses. But their small size does not limit

their performance. All Global Pro fuses offer the following:

• Extremely compact size

• Pop-up indication

• Performance to UL Class J fuse requirements

• Compatibility with IEC style fuseholders

Note: For more information refer to pages 162–163 of this catalog.

Littelfuse Global Pro™ System

Good

Blown

POWR-PRO® Fuses

www.littelfuse.com

Circuit Protection Simplified!

The Littelfuse exclusive MROplus (Material Reduction Opportunity Plus)

program is designed to help lower costs, reduce inventory and improve

circuit protection performance. A team of Littelfuse technical experts will

analyze inventory and generate a variety of detailed reports including:

a total cost savings report, a cross reference report and a duplicate or

obsolete inventory report. On average, customers who use the Littelfuse

MROplus program are able to reduce their inventory by 28%. All you

have to do is supply a list of current inventory and the Littlefuse MROplus

program will do the rest. And, best of all, it is absolutely FREE!

For more information call 1-800-TEC-FUSE

Full Color Presentation Brochure

Your Customized Inventory Analysis Is Inside

Customized Inventory Analysis Reports

POWR-PRO® Fuses

www.littelfuse.com

Littelfuse POWR-PRO® System

The Littelfuse POWR-PRO

System of fuses gives you all

the fuses you need for complete

circuit protection coverage

while reducing inventory and

controlling costs.

COLOR COORDINATED FOR EASE OF IDENTITY AND REPLACEMENT

Green label fuses provide all

the inventory you need for:

• Superior current-limitation from

1/10 – 6000 amperes.

• Type 2 “No Damage”

coordination with NEMA and

IEC motor circuits.

• Blown fuse indication

(LLSRK_ID and JTD_ID).

• Compact protection for motor

circuits (JTD, JTD_ID, and

CCMR).

• 300,000 AIR to meet future

trends toward higher available

short circuit currents.

The POWR-PRO System will:

• Provide superior current-limiting protection with innovative, tested

designs to prevent or reduce electrical system damage.

• Reduce inventory by standardizing system protection.

• Provide visual blown fuse indication with LLSRK_ID, and JTD_ID

Indicator® fuses.

• Reduce fuse replacement downtime with simple color coded fuse

labels.

See for yourself why the POWR-PRO System gives you the widest range

of circuit protection available today when compared to other systems.

UL Fuse Class POWR-PRO®Low Peak System 2000

Class L KLPC KRPC A4BQ

Class RK1 LLNRK/LLSRK_ID LPNRK/LPSRK A2DR/A6DR

Class J JTD/JTD_ID LPJ AJT

Class CC CCMR (2/10–60) LPCC (1/2–30) ATDR (0–30)

Minimize Arc-Flash Hazards

Some of the factors that determine the severity of an Arc-Flash

are the magnitude of the fault current and the time the current is

allowed to flow. Current-limiting fuses applied within their current-

limiting range minimize the current flow and clear the fault in

0.00833 seconds or less. The more current-limiting the device

and the faster it clears the fault minimizes Arc-Flash hazards and

potentially reduces the amount of personal protective equipment

(PPE) required. Using Littelfuse POWR-PRO Fuses will not only

minimize Arc-Flash hazards with superior current limitation, but also

provide maximum protection to equipment.

One of the quickest and easiest ways to reduce Arc-Flash hazards is to

replace UL Class H, K5, and Class RK5 fuses with POWR-PRO current-

limiting Class RK1 or Class J fuses. For a given current and voltage

rating, Class H, K5, RK5, and RK1 fuses are the same physical size.

Therefore, it is easy to upgrade to better fuse protection and increased

safety. To insure that only the most current-limiting fuse is used, it

is recommended to change fuse clips to a rejection style for Class R

or Class J fuses. Class J fuses provides the best option by assuring

non-interchangeability with non-current-limiting fuses. Whichever

your choice, the equipment should be labeled to inform maintenance

personnel of the proper fuse replacement. The Littelfuse MROplusTM

Program can assist with analyzing and upgrading from non-current-

limiting fuses.

POWR-PRO® Fuses

KLPC Series POWR-PRO® Class L Fuses

600 VAC • Time-Delay • 200 – 6000 Amperes

Specifications

Voltage Ratings: AC: 600 Volts

DC: 480 Volts

Interrupting Ratings: AC: 200,000 am peres rms sym met ri cal

300,000 amperes rms sym met ri cal

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 200 – 6000 am peres

Approvals: AC: Standard 248-10, Class L

UL Listed 601 – 6000 amps

(File No: E81895)

UL Recognized 200 – 600 amps

(File No: E71611)

CSA Certified 200 – 6000 amps

(File No: LR29862)

QPL Federal Specifications WF-1814

700 – 6000 amps

DC: Littelfuse self-certified

Ampere Ratings

200 500 800 1350 2000 3500

250 600 900 1400 2100 4000

300 601 1000 1500 2200 4500

350 650 1100 1600 2300 5000

400 700 1200 1800 2500 6000

450 750 1300 1900 3000

Example part number (series & amperage): KLPC 1000

KLPC series POWR-PRO fuses provide ideal overcurrent protection

for circuits from 200 through 6000 amperes. KLPC series POWR-PRO

fuses specification-grade con struc tion and performance meet or exceed

the most strin gent project specifications: 99.9% pure silver links, silver-

plat ed copper end bells, glass-reinforced melamine bodies, O-ring seals

between body and end bells, and granular quartz fillers.

KLPC series POWR-PRO fuses are the only UL listed Class L fuses

that provide a minimum of ten seconds time delay at 500% rated

current and are also as current-limiting as the fastest Class L fuse on the

market. On average, the peak let-through currents of KLPC series fuses

are 10% less than any other time-delay Class L fuse.

Applications

Service switches

Switchboard mains and feeders

Bolted pressure contact switches

Motor control center mains

Large motor branch circuits

UL Listed series-rated protection for molded case circuit breaker

panelboards and loadcenters. (See panelboard manufacturers’

literature for recommended fuse rating.)

Primary and secondary protection for transformers

Protection of power circuit breakers

Features and Benefits

• Eliminate unnecessary downtime — KLPC POWR-PRO series time-

delay withstands system surges and keeps your circuits in service.

• Best protection for system components — Maximum current

limitation means less equipment and system damage when short

circuits occur. Reduced dam age means that electrical service can

be restored quickly, re duc ing costly downtime, and often permitting

equipment repair rather than replacement.

• Coordinates with other system components — KLPC series fuses

provide maximum coordination with fuses and circuit breakers both

on the line and load side of the fuses. See the Fuseology section of

this catalog for additional information.

• Eliminate need to oversize fuses — This may permit the use of smaller,

less expensive switches. Since lower rated fuses are more current-

limiting, equipment receives even better protection.

• 300kA Interrupting Rating — Littelfuse self-certified to 300,000

am peres as standard. Meets future trend towards higher available

short circuit currents.

POWR-PRO® Fuses

www.littelfuse.com

KLPC Series POWR-PRO® Class L Fuses

600 VAC • Time-Delay • 200 – 6000 Amperes

FIG.1

AABC

DEF

FIG.2

DEF

ABC

FIG. 3

FIG. 5

DEF

ABC

FIG. 4

Amperes Fig. No. Dimensions in Inches (mm in parentheses)

ABCDE FGH J K L M N

200 – 800 1 33⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5) ——

85⁄8

(219.1) —— 2

(50.8)

21⁄2

(63.5)

3⁄8

(9.5)

5⁄8 x 11⁄8

(15.9) x (28.6) —

801 – 1200 2 33⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) —— 2

(50.8)

21⁄2

(63.5)

3⁄8

(9.5)

5⁄8 x 3⁄4

(15.9) X (19.1)

5⁄8 x 11⁄8

(15.9) X (28.6)

1201 – 1600 2 33⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) ——23⁄8

(60.3)

(76.2)

7⁄16

(11.1)

5⁄8 X 3⁄4

(15.9) X (19.1)

5⁄8 X 11⁄8

(15.9) X (28.6)

1601 – 2000 2 33⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) ——23⁄4

(69.9)

31⁄2

(88.9)

1⁄2

(12.7)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

2001 – 2500 3 4

(101.6)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

15⁄8

(41.3)

13⁄4

(44.5)

31⁄2

(88.9)

(127.0)

3⁄4

(19.1)

5⁄8 X 3⁄4

(15.9) x (19.1)

5⁄8 X 11⁄8

(15.9) x (28.6)

2501 – 3000 3 4

(101.6)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

15⁄8

(41.3)

13⁄4

(44.5)

(101.6)

(127.0)

3⁄4

(19.1)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

3001 – 4000 4 4

(101.6)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

13⁄4

(44.5)

31⁄4

(82.6)

43⁄4

(120.7)

53⁄4

(146.1)

3⁄4

(19.1)

5⁄8 x 13⁄8

(15.9) x (34.9)

5⁄8 x 13⁄8

(15.9) x (34.9)

4001 – 5000 5 4

(101.6)

53⁄4

(146.1) —91⁄4

(235.0) —103⁄4

(273.1)

15⁄8

(41.3)

31⁄4

(82.6)

51⁄4

(133.4)

71⁄8

(181.0)

(25.4)

5⁄8 DIA.

(15.9) —

5001 – 6000 5 4

(101.6)

53⁄4

(146.1) —91⁄4

(235.0) —103⁄4

(273.1)

15⁄8

(41.3)

31⁄4

(82.6)

53⁄4

(146.1)

71⁄8

(181.0)

(25.4)

5⁄8 DIA.

(15.9) —

POWR-PRO® Fuses

KLPC Series POWR-PRO® Class L Fuses

600 VAC • Time-Delay • 200 – 6000 Amperes

* Prospective RMS Sym met ri cal Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

Current-Limiting Effects of KLPC (600V) fuses

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

6000A

5000A

4000A

3000A

2000A

1600A

1200A

800A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

100

200

300

400

600

800

1000

800A

1200A

1600A

2000A

2500A

3000A

3500A

4000A

5000A

6000A

TIME IN SECONDS

CURRENT IN AMPERES

Short Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings

800A 1200A 1600A 2000A 3000A 4000A 5000A 6000A

5,000 5,000 5,000 5,000 5,000 5,000 5,000 5,000 5,000

10,000 8,800 10,000 10,000 10,000 10,000 10,000 10,000 10,000

15,000 10,500 13,500 15,000 15,000 15,000 15,000 15,000 15,000

20,000 12,000 15,000 19,000 20,000 20,000 20,000 20,000 20,000

25,000 13,000 16,000 21,000 24,000 25,000 25,000 25,000 25,000

30,000 14,000 18,000 23,000 26,000 30,000 30,000 30,000 30,000

35,000 15,000 19,000 24,000 27,000 32,000 35,000 35,000 35,000

40,000 16,000 20,000 25,000 28,000 34,000 40,000 40,000 40,000

50,000 17,000 22,000 27,000 31,000 37,000 42,500 50,000 50,000

60,000 18,000 24,000 29,000 34,000 40,000 46,000 52,000 60,000

80,000 20,000 26,000 32,000 37,000 44,000 51,000 57,000 70,000

100,000 21,000 27,000 34,000 40,000 46,000 57,000 65,000 75,000

150,000 23,000 31,000 38,000 44,000 54,000 67,000 75,000 87,000

200,000 24,000 34,000 42,000 46,000 57,000 70,000 80,000 95,000

POWR-PRO® Fuses

www.littelfuse.com

LLSRK_ID Series Indicator® POWR-PRO® Class RK1 Fuses

600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

The all new LLSRK_ID series fuse is the most advanced Class RK1

fuse available today providing unparalleled performance and protection

to modern circuits. The patented Indicator technology provides instant

identification of a blown fuse greatly enhancing system up-time, while

the precision formed short-circuit elements virtually eliminate damage

to components from unexpected electrical faults. In addition, the all new

solid-state overload section has no moving parts, stopping unnecessary

fatigue failures commonly found in other spring loaded fuses.

Applications

All general purpose circuits

Motors

Transformers

Solenoids

Fluorescent lighting

All system components with high in-rush currents

Features/Benefits

• Reduce downtime — The indicating window of the LLSRK_ID

immediately identifies the open fuse. If the indicating strip is black,

the fuse has opened. It’s that simple. Maintenance personnel can

immediately determine that there is an open fuse.

• Reduce fuse inventory — The superior performance of the LLSRK_ID

allows it to be used in a variety of applications, thus decreasing fuse

inventory.

• Reduce nuisance opening — Indicator fuses offer superior time-delay

and cycling characteristics, which can lengthen fuse life.

• Reduce equipment damage — Indicator fuses provide superior

overload and short-circuit protection that can reduce equipment

damage. The LLSRK_ID is extremely current-limiting and provides

IEC Type 2 “No Damage” protection to IEC and NEMA type motor

starters.

• Reduce accidents — The LLSRK_ID Indicator fuse improves safety

by minimizing exposure to live circuits. Unlike other forms of blown

fuse indication, once the indicating strip darkens, it stays dark. Other

forms of indication require the power to remain on, which causes a

potential safety hazard to personnel.

Ordering Information

For online ordering use part number LSRK.

Specifications

Voltage Rating: 600 VAC/300 VDC

Interrupting Ratings: AC: 200,000 amperes rms symmetrical

300,000 amperes rms symmetrical

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 1/10 – 600 amperes

Approvals: AC: Standard 248-12, Class RK1

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

DC: Littelfuse self-certified

Ampere Ratings

1⁄10 12

8⁄10 61⁄425 80 250

15 ⁄100 11⁄83 7 30 90 300

2⁄10 11⁄432⁄10 835100 350

1⁄414⁄10 31⁄2940110 400

3⁄10 16⁄10 41045125 450

4⁄10 18⁄10 41⁄212 50 150 500

1⁄22 5 15 60 175 600

6⁄10 21⁄456⁄10 171⁄270 200

8⁄10 21⁄262075225

Example part number (series & amperage): LLSRK30ID.

NOTE: All fuses rated 1 amp and above are Indicator fuses.

Recommended Fuse Blocks

LR600 Series

Refer to the Blocks & Holders section of this catalog for

additional information.

POWR-PRO® Fuses

LLSRK_ID Series Indicator® POWR-PRO® Class RK1 Fuses

600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

TIME IN SECONDS

CURRENT IN AMPERES

60A

35A

30A

15A

12A

3.5A

2.8A

1.6A

1.25A

1000

100

200010001001010.5

0.01

0.1

Blown Fuse Indicator Assembly

Granular Quartz Filling

Precision Formed Short Circuit Element

Fiberglass Reinforced Pultruded Body

Elastomeric Silicone Overload Section

Contact Littelfuse for additional fuse curves.

Plated End Caps

TIME IN SECONDS

CURRENT IN AMPERES

POWR-PRO® Fuses

www.littelfuse.com

SYMMETRICAL R.M.S. AMPERES

AVAILABLE FAULT CURRENT

PEAK LET-THRU IN AMPERES

3.5A

12A

30A

60A

200000

100000

10000

1000

100

1000000

100000

10000

1000

100

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

Current-Limiting Effects of LLSRK_ID (600V) Fuses

Short Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings

30A 60A 100A 200A 400A 600A

5,000 1,060 1,600 2,100 2,600 4,100 --

10,000 1,350 2,000 2,800 3,400 5,250 8,000

15,000 1,600 2,300 3,200 3,900 6,000 9,000

20,000 1,700 2,600 3,600 4,500 6,700 10,000

25,000 1,900 2,800 3,800 4,800 7,500 11,000

30,000 2,000 3,000 4,100 5,200 8,000 12,000

35,000 2,100 3,100 4,400 5,700 8,500 12,500

40,000 2,200 3,300 4,600 6,000 9,000 13,000

50,000 2,400 3,500 4,900 6,500 9,500 14,000

60,000 2,500 3,800 5,200 7,000 10,000 15,000

80,000 2,700 4,000 5,700 7,750 11,000 17,000

100,000 2,900 4,200 6,200 8,500 12,000 18,000

150,000 3,200 4,600 7,300 10,000 14,000 21,000

200,000 3,300 4,700 8,000 11,000 16,000 23,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

LLSRK_ID Series Indicator® POWR-PRO® Class RK1 Fuses

600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

POWR-PRO® Fuses

LLNRK/LLSRK Series POWR-PRO® Class RK1 Fuses

250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

Littelfuse LLNRK and LLSRK series POWR-PRO fuses provide superior

over load and short-circuit protection for service entrance, main, feeder

and general-purpose branch circuits up to 600 amperes.

LLNRK/LLSRK series fuses can be installed in existing Class H fuse

blocks to upgrade systems containing lower in ter rupt ing rating Class H

one-time or renewable fuses.

Applications

All general purpose circuits

Motors

Transformers

Solenoids

Fluorescent lighting

All system components with high in-rush currents

Features/Benefits

• Extremely current-limiting — Reduces damage to circuits and

equipment under short-circuit conditions. Stops damaging short-

circuits faster than any mechanical protective device.

• 300kA Interrupting Rating — Littelfuse self-certified to 300,000

am peres as standard. Meets future trend towards higher available

short-circuit currents.

• Reduced costs — Current-limiting design often permits use of readily

available, less costly equipment. Low resistance design reduces

power con sump tion and utility bills.

• Excellent time-delay — True dual-element construction, with sep a rate

non-fatiguing thermally-reversible spring-loaded thermal overload

element, withstands repeated surges within rated time delay without

opening needlessly. Eliminates needless downtime caused by power

surges or equipment demands.

Specifications

Voltage Ratings: AC: 250 Volts (LLNRK)

600 Volts (LLSRK)

DC: 125 Volts (LLNRK)

300 Volts (LLSRK)

Interrupting Ratings: AC: 200,000 am peres rms sym met ri cal

300,000 amperes rms sym met ri cal

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 1/10 – 600 amperes

Approvals: AC: Standard 248-12, Class RK1

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

QPL: Federal Specification No. WF-1814

DC: Littelfuse self-certified

Ampere Ratings

1⁄10 12

8⁄10 61⁄425 80 250

15 ⁄100 11⁄83 7 30 90 300

2⁄10 11⁄432⁄10 835100350

1⁄4*1

4⁄10 31⁄2940110400

3⁄10 16⁄10 41045125450

4⁄10 18⁄10 41⁄212 50 150 500

1⁄2251560175600

6⁄10 21⁄456⁄10 171⁄270 200

8⁄10 21⁄262075*225

* LLSRK Only.

Example part number (series & amperage): LLNRK 450.

For online ordering, use numbers LNRK and LSRK for LLNRK/LLSRK.

Recommended Fuse Blocks

LR250 series (LLNRK Series)

LR600 series (LLSRK Series)

Refer to the Blocks & Holders section of this catalog for ad di tion al in for ma tion.

POWR-PRO® Fuses

www.littelfuse.com

LLNRK/LLSRK Series POWR-PRO® Class RK1 Fuses

250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

FDG

70-600A

FIG. 1 FIG. 2

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

15A

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

15A

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

LLNRK LLSRK

Amperes Refer to

Fig. No. Series Dimensions in Inches (mm in parentheses)

ABCDEFGHJK

1/10 – 30 1 LLNRK 2 (50.8) 1⁄2 (12.7) 1⁄2 (12.7) 9⁄16 (14.3) 5⁄64 (2.0) 5⁄32 (4.0) 3⁄8 (9.5) — — —

LLSRK 5 (127.0) 3⁄4 (19.1) 5⁄8 (15.9) 3⁄16 (20.6) 3⁄32 (2.4) 3⁄16 (4.8) 5⁄8 (15.9) — — —

35 – 60 1 LLNRK 3 (76.2) 3⁄4 (19.1) 5⁄8 (15.9) 3⁄16 (20.6) 3⁄32 (2.4) 3⁄16 (4.8) 5⁄8 15.9) — — —

LLSRK 51⁄2 (139.7) 1 (25.4) 5⁄8 (15.9) 11⁄16 (27.0) 3⁄32 (2.4) 1⁄4 (6.4) 7⁄8 (22.2) — — —

70 – 100 2 LLNRK 57⁄8 (149.2) 1 (25.4) 11⁄16 (27.0) 11⁄16 (27.0) 1⁄8 (3.2) 3⁄4 (19.1) 11⁄4 (31.8) 1⁄4 (6.4) 9⁄32 (7.1) 1⁄2 (12.7)

LLSRK 77⁄8 (200.0) 11⁄4 (31.8) 11⁄16 (27.0) 15⁄16 (33.3) 1⁄8 (3.2) 3⁄4 (19.1) 11⁄2 (38.1) 1⁄4 (6.4) 9⁄32 (7.1) 1⁄2 (12.7)

110 – 200 2 LLNRK 71⁄8 (181.0) 11⁄2 (38.1) 115 ⁄32 (37.3) 119 ⁄32 (40.5) 3⁄16 (4.8) 11⁄8 (28.6) 127⁄32 (46.8) 7⁄16 (11.1) 9⁄32 (7.1) 11 ⁄16 (17.5)

LLSRK 95⁄8 (244.5) 13⁄4 (44.5) 115 ⁄32 (37.3) 127⁄32 (46.8) 3⁄16 (4.8) 11⁄8 (28.6) 23⁄32 (53.2) 7⁄16 (11.1) 9⁄32 (7.1) 11 ⁄16 (17.5)

225 – 400 2 LLNRK 85⁄8 (219.1) 2 (50.8) 115 ⁄16 (49.2) 23⁄32 (53.2) 1⁄4 (6.4) 15⁄8 (41.3) 211 ⁄32 (59.5) 5⁄8 (15.9) 13⁄32 (10.3) 15 ⁄16 (23.8)

LLSRK 115⁄8 (295.3) 21⁄2 (63.5) 2 (50.8) 219 ⁄32 (65.9) 1⁄4 (6.4) 15⁄8 (41.3) 227⁄32 (72.2) 5⁄8 (15.9) 13 ⁄32 (10.3) 15 ⁄16 (23.8)

450 – 600 2 LLNRK 103⁄8 (263.5) 21⁄2 (63.5) 23⁄8 (60.3) 219 ⁄32 (65.9) 1⁄4 (6.4) 2 (50.8) 227⁄32 (72.2) 3⁄4 (19.1) 17⁄32 (13.5) 11⁄8 (28.6)

LLSRK 133⁄8 (339.7) 3 (76.2) 213 ⁄32 (61.1) 33⁄32 (78.6) 1⁄4 (6.4) 2 (50.8) 311⁄32 (84.9) 3⁄4 (19.1) 17⁄32 (13.5) 11⁄8 (28.6)

POWR-PRO® Fuses

LLNRK/LLSRK Series POWR-PRO® Class RK1 Fuses

250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

Current-Limiting Effects of LLSRK (600V) fuses

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

Current-Limiting Effects of LLNRK (250V) fuses

LLNRK LLSRK

Short

Circuit

Current*

Apparent RMS Sym met ri cal for Various Fuse Ratings

30A 60A 100A 200A 400A 600A

5,000 1,060 1,600 2,100 2,600 4,100 —

10,000 1,350 2,000 2,800 3,400 5,250 8,000

15,000 1,600 2,300 3.200 3,900 6,000 9,000

20,000 1,700 2,600 3,600 4,500 6,700 10,000

25,000 1,900 2,800 3,800 4,800 7,500 11,000

30,000 2,000 3,000 4,100 5,200 8,000 12,000

35,000 2,100 3,100 4,400 5,700 8,500 12,500

40,000 2,200 3,300 4,600 6,000 9,000 13,000

50,000 2,400 3,500 4,900 6,500 9,500 14,000

60,000 2,500 3,800 5,200 7,000 10,000 15,000

80,000 2,700 4,000 5,700 7,750 11,000 17,000

100,000 2,900 4,200 6,200 8,500 12,000 18,000

150,000 3,200 4,600 7,300 10,000 14,000 21,000

200,000 3,300 4,700 8,000 11,000 16,000 23,000

* Prospective RMS Sym met ri cal Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

Short

Circuit

Current*

Apparent RMS Sym met ri cal for Various Fuse Ratings

30A 60A 100A 200A 400A 600A

5,000 900 1,400 2,000 2,700 4,800 5,000

10,000 1,100 1,900 2,700 3,500 6,200 8,500

15,000 1,250 2,100 3,100 4,200 7,000 9,500

20,000 1,400 2,400 3,500 4,600 8,000 10,800

25,000 1,500 2,600 3,900 5,000 8,300 11,500

30,000 1,600 2,800 4,000 5,250 9,000 12,000

35,000 1,700 2,850 4,300 5,500 9,500 12,500

40,000 1,800 3,000 4,600 5,800 9,800 13,500

50,000 1,900 3,200 4,800 6,300 10,200 14,000

60,000 2,000 3,500 5,200 6,700 11,000 15,000

80,000 2,200 3,900 5,700 7,200 12,200 16,000

100,000 2,300 4,000 6,000 8,100 12,700 17,000

150,000 2,500 4,500 6,700 9,100 14,000 19,000

200,000 2,600 4,800 7,000 9,700 15,000 20,000

* Prospective RMS Sym met ri cal Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

POWR-PRO® Fuses

www.littelfuse.com

JTD_ID Series Indicator® POWR-PRO® Class J Fuses

600 VAC • Time Delay • 8/10 – 600 Amperes

The Littelfuse POWR-PRO JTD_ID Indicator Class J fuse provides visual

blown fuse indication and maximum protection in a compact package.

The compact Class J package was designed specifically for circuits

where space is at a premium. The current-limiting time delay JTD_ID

offers a patented, true dual-element design that is ideal for use in circuits

with high, in-rush currents. The Superior performance characteristics of

JTD_ID Indicator fuses reduce nuisance fuse opening, and the blown

fuse indication reduces downtime while increasing safety.

Applications

Fused combination motor controllers to provide IEC Type 2 (“No

Damage”) motor branch circuit short-circuit and ground fault

protection

Motor control centers

Transformer protection

Protection for UL Listed series rated molded case circuit breaker panels

General purpose circuits — mains, feeders and branch circuits —

especially when space is limited.

Features/Benefits

• Reduce downtime — A glance at the indicating window of a JTD_ID

Indicator fuse pinpoints open fuses immediately. If the indicating

window is dark, the fuse has opened. It’s that simple.

• Reduce nuisance opening — Indicator fuses have superior time-delay

and cycling characteristics which can lengthen fuse life and decrease

needless opening.

• Reduce fuse inventory — JTD _ID Indicator fuses have superior

performance characteristics, which means they can be used on a

variety of applications; therefore, decreasing fuse inventory.

• Reduce equipment damage — Indicator fuses provide superior

overload and short-circuit protection that can reduce equipment

damage. Indicator fuses also provide IEC Type 2 “No Damage”

protection to IEC and NEMA type motor starters.

• Reduce accidents — The JTD_ID Indicator fuse improves safety

by minimizing exposure to live circuits. Unlike other forms of blown

fuse indication, once the indicating window darkens, it stays dark. It

does not matter if the power is on or off or if the fuse is in a tool box.

Other forms of indication require the power to remain on, which is a

safety hazard for personnel.

Specifications

Voltage Ratings: AC: 600 Volts

DC: 300 Volts (8⁄10 – 100A)

500 Volts (110 – 600A)

Interrupting Ratings: AC: 200,000 am peres rms sym met ri cal

300,000 amperes rms symmetrical

(Littelfuse self-certified)

Ampere Range: 8/10 – 600 amperes

Approvals: AC: Standard 248-8, Class J

ULListed (File No: E81895)

CSA Certified (File No: LR29862)

DC: Littelfuse self-certified

8⁄10 - 100A: 300VDC self certified

110 – 600A: 500VDC self certified

Ampere Ratings

8⁄10 28⁄10 730100350

13835110400

11⁄432⁄10 940125450

11⁄231⁄210 45 150 500

16⁄10 41250175600

18⁄10 41⁄215 60 200

2517

1⁄270 225

21⁄456⁄10 20 80 250

21⁄262590300

Example part number (series & amperage): JTD 60 ID

Recommended Fuse Blocks

LJ600 series, LPSJ series

Refer to Blocks & Holders section of this catalog for ad di tion al in for ma tion.

POWR-PRO® Fuses

JTD_ID Series Indicator® POWR-PRO® Class J Fuses

600 VAC • Time-Delay • 8/10 – 600 Amperes

DGF

FIG. 1 FIG.2

An Inside Look . . .

Superior Short-Circuit Elements

Reduce damage to equipment and enables

the Littelfuse JTD_ID to provide IEC Type 2

“No Damage” protection to IEC and NEMA

motor starters.

Stone-Sand Filler

Helps provide I2t and Ipeak values well below

UL maximum limits and improves heat

dissipation and reliability.

Elastomeric Silicone EPR Plug

A space-age material used in the patented

overload section of the Littelfuse JTD_ID.

Plated End Caps

Help reduce corrosion and provide superior

contact for lower heat generation.

Blown Fuse Indicator

Incorporates precision wound elements to

provide consistent and reliable blown fuse

indication.

Solid State Overload Section

Patented thermally reversible design utilizes

high-tech aircraft grade polymers to ensure

reliable operation every time.

Granular Quartz Filler

Assists in quenching the arc that occurs during

overload conditions.

Amperes Refer to

Fig. No.

Dimensions in Inches (mm in parentheses)

ABCDEFGH

8/10– 30 1 21⁄4 (57.2) —1⁄2 (12.7) 13 ⁄16 (20.6) ————

35 – 60 1 23⁄8 (60.3) —5⁄8 (15.9) 11⁄16 (27.0) ————

70 – 100 2 25⁄8 (66.7) 35⁄8 (92.1) —45⁄8 (117.5) 11⁄8 (28.6) 3⁄4 (19.1) 9⁄32 (7.1) 1⁄8 (3.2)

110 – 200 2 3 (76.2) 43⁄8 (111.1) —53⁄4 (146.1) 15⁄8 (41.3) 11⁄8 (28.6) 9⁄32 (7.1) 3⁄16 (4.8)

225 – 400 2 33⁄8 (85.7) 51⁄4 (133.4) —71⁄8 (181.0) 21⁄8 (54.0) 15⁄8 (41.3) 13 ⁄32 (10.3) 1⁄4 (6.4)

450 – 600 2 33⁄4 (95.3) 6 (152.4) — 8 (203.2) 25⁄8 (66.7) 2 (50.8) 17⁄32 (13.5) 3⁄8 (9.5)

POWR-PRO® Fuses

www.littelfuse.com

JTD_ID Series Indicator® POWR-PRO® Class J Fuses

600 VAC • Time-Delay • 8/10 – 600 Amperes

Current-Limiting Effects of JTD_ID (600V) fuses

1000000

100000

10000

1000

1000 10000 100000 200000

100

600A

400A

200A

100A

60A

30A

15A

12A

5.6A

AVAILABLE FAULT

SYMMETRICAL R.M.S. AMPERES

PEAK LET-THRU IN AMPERES

Short Circuit

Current*

Apparent RMS Sym met ri cal for Various Fuse Ratings

15A 30A 60A 100A 200A 400A 600A

5,000 565 750 1,500 1,800 2,800 4,800 5,000

10,000 675 925 1,900 2,450 3,600 5,700 7,750

15,000 775 1,050 2,100 2,800 4,100 6,500 9,000

20,000 825 1,125 2,300 3,000 4,400 7,250 9,700

25,000 900 1,200 2,500 3,300 5,000 8,000 10,500

30,000 950 1,300 2,600 3,500 5,100 8,400 11,000

35,000 1,000 1,350 2,700 3,700 5,400 9,000 12,000

40,000 1,050 1,400 2,800 3,900 5,600 9,200 12,500

50,000 1,100 1,500 3,000 4,200 6,000 10,000 13,000

60,000 1,200 1,600 3,200 4,500 6,400 10,500 14,000

80,000 1,300 1,700 3,400 4,900 7,200 11,200 15,500

100,000 1,375 1,800 3,600 5,200 7,800 12,200 16,500

150,000 1,500 2,000 3,950 6,000 9,000 14,500 19,000

200,000 1,600 2,175 4,000 6,500 10,000 16,000 20,500

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data derived from Peak Let-Thru Curves

POWR-PRO® Fuses

CCMR Series POWR-PRO® Class CC and CD Fuses

600 VAC • Dual-Element, Time-Delay • 2/10 – 60 Amperes

For space saving protection of motor circuits up to 40 HP*, we

recommend Littelfuse POWR-PRO CCMR series fuses. These fuses

are the only true dual-element, time-delay fuses that come in a small

package specifically en gi neered for motor branch circuit pro tec tion.

CCMR series fuses pro vide Type 2 “No Damage” pro tec tion to both

NEMA-rated and the more sensitive IEC (International Electrotechnical

Com mis sion) type motor circuit com po nents.

Rating for rating, CCMR fuses are the most current-limiting fuses

available. They also provide superior short-circuit protection since their

time-delay characteristics permit the use of smaller fuse ratings in motor

circuits than would be possible if using fast-acting fuses. CCMR series

fuses provide superior pro tec tion in a fraction of the space required by

other fuse classes. For example, when 600V three pole, 30 ampere Class

R fuse blocks are replaced by Littelfuse Class CC fuse blocks, mounting

space requirements may be re duced 70% or more. This is especially

im por tant when a panel contains control devices for many motors.

In addition to the UL Listed smaller sizes, Littelfuse CCMR series fuses

are now available in larger sizes — from 35 to 60 amperes! No other

fuse is available with this current carrying capacity in a package

this small. In fact, the 60 ampere CCMR fuse is the smallest 60A

fuse available rated at 600 volts.

Applications

CCMR series fuses are specifically designed to withstand sustained

starting currents of small motors

Provide short-circuit protection for motor branch circuits

Use with IEC- and NEMA-rated motor controllers and contactors

General purpose circuits up to 60 amps

Features/Benefits

• Space savings — No other fuse class approved for branch circuit

protection has a 600 volt rating and 300,000 A.I.R. in such a small

package.

• Extremely current-limiting — Reduces dam age caused by heating

and magnetic effects of short-circuit currents. Stops damaging short-

circuit currents faster than any me chan i cal protective device.

• Excellent time-delay — Eliminates needless down time caused by

power surges or equip ment demands. Permits selection of fuse sizes

closer to actual load conditions, which provides better protection.

• 300kA Interrupting Rating — Littelfuse self-certified to 300,000

am peres as standard. Meets future trend towards higher available

short-circuit currents.

*Consult the Motor Protection Tables in the Fuseology section for specific motor sizing information

Specifications

Voltage Ratings: AC: 600 Volts

DC: 250 Volts (CCMR

2⁄10 — 2A)

(CCMR 41⁄2 — 10A)

(CCMR 35 — 60A)

300 Volts (CCMR 21⁄4 — 4A)

500 Volts (CCMR 12 — 30A)

Interrupting Ratings: AC: 200,000 amperes rms symmetrical

300,000 amperes rms symmetrical

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 2⁄10 — 60 amperes

Approvals: AC: Standard 248-4, Class CC

UL Listed

2⁄10 – 30 amps (File No: E81895)

Standard 248, Class CD

UL Listed 35 – 60 amps (File No: E81895)

CSA Certified

2⁄10 – 60 amps

(File No: LR29862)

DC: Littelfuse self-certified

Ampere Ratings

2⁄10 123

1⁄261⁄412 35

1⁄411⁄421⁄4471540

3⁄10 14⁄10 21⁄241⁄271⁄2171⁄245

1⁄211⁄228⁄10 582050

6⁄10 16⁄10 35

6⁄10 92560

8⁄10 18⁄10 32⁄10 61030

Example part number (series & amperage): CCMR 40

Recommended Fuse Blocks

LPSC (CCMR 2⁄10 — 30A)

L60030C series (CCMR 2⁄10 — 30A)

L60060C series (CCMR 35 — 60A)

Refer to Blocks & Holders section of this catalog for additional in for ma tion.

POWR-PRO® Fuses

www.littelfuse.com

CCMR Series POWR-PRO® Class CC and CD Fuses

600 VAC • Dual-Element, Time-Delay • 2/10 – 60 Amperes

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

60A

30A

20A

15A

12A

10A

6 1/4A

Current-Limiting Effects of CCMR (600V) fuses

1.880"

(47.8 mm)

.850"

(21.6 mm)

1.50"

(38.1 mm)

.50"

(12.7 mm)

.41"

(10.3 mm)

.25"

(6.4 mm)

.125"

(3.2 mm)

35-60A

0-30A

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

.08

.05

1/4A

1/2A

8/10A

1 1/4A

1 1/2A

1 8/10A

2 1/2A

3 1/2A

10A

12A

15A

20A

25A

30A

35A

60A

TIME IN SECONDS

CURRENT IN AMPERES

Short Circuit Current* Apparent RMS Symmetrical For Various Fuse Ratings

2A 4A 61⁄4A10A 12A 15A 20A 30A

5,000 160 190 330 370 525 600 625 750

10,000 180 220 400 440 600 700 725 875

15,000 200 250 430 480 675 775 800 950

20,000 220 260 460 520 720 825 850 1,000

25,000 230 280 480 550 750 850 900 1,050

30,000 240 290 500 570 800 900 950 1,125

35,000 245 300 520 590 825 925 975 1,175

40,000 255 310 550 600 850 975 1,000 1,200

50,000 260 330 570 640 875 1,000 1,100 1,300

60,000 280 340 600 670 900 1,050 1,125 1,350

80,000 300 360 625 700 1,000 1,125 1,200 1,400

100,000 310 380 650 750 1,050 1,200 1,250 1,500

150,000 340 420 700 800 1,150 1,300 1,400 1,600

200,000 350 440 750 850 1,200 1,400 1,450 1,750

*Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

POWR-PRO® Fuses

IDSR Series Indicator® POWR-PRO® Class RK5 Fuse

600 V AC/DC • Time-Delay • 1/10 – 600 Amperes

The Littelfuse IDSR Indicator fuse offers a patented solid-state design

and provides state-of-the-art reliability along with the convenience of

blown fuse indication. The unique design of the IDSR also features a

600 volt AC/DC rating making it ideal for DC applications.

Money is wasted each time a circuit opens and halts production.

The indicator window of the IDSR allows maintenance personnel to

pinpoint blown fuses immediately. The circuit can then be tested and

any problem corrected without unnecessary delay, minimizing costly

downtime.

Applications

DC circuits

All general purpose circuits

Motors

Transformers

Solenoids

Fluorescent lighting

All system components with high in-rush currents

Features/Benefits

• Superior Performance – Littelfuse leading edge metallurgy

eliminates all moving parts in a true dual-element design. The IDSR

also provides superior time-delay to withstand minor current surges

without sacrificing protection for sustained overloads or short-

circuit conditions.

• 600 Volt AC/DC Rating – The IDSR is UL Listed for 600 volts

AC/DC, which makes it ideal for a variety of applications. It is also

MSHA approved.

• Reduce Downtime – Costly downtime is minimized using Littelfuse

Indicator fuses. A glance at the indicator window tells if the fuse

has blown. If the window is dark, the fuse has opened. It’s that

simple.

• Increase Safety – Littelfuse Indicator Fuses minimize exposure to

“live” circuit parts while searching for a blown fuse. Other forms of

indication require current to power a light. Littelfuse Indicator fuses

can be identified with the power off.

Specifications

Voltage Ratings: AC: 600 Volts

DC: 600 Volts

Interrupting Ratings: AC: 200,000 am peres rms symmetrical

300,000 amperes rms sym met ri cal

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 1⁄10 – 600 amperes

Approvals: Standard 248-12 and UL 198M, Class RK5

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

MSHA 600 Volt Listing

Dimensions

Please refer to the FLSR_ID dimensions.

Ampere Ratings

1⁄10 6⁄10 18⁄10 483080225

1⁄88⁄10 24

1⁄293590250

15 ⁄100 12

1⁄451040100300

2⁄10 11⁄821⁄256⁄10 12 45 110 350

1⁄411⁄428⁄10 61550125400

3⁄10 14⁄10 36

1⁄4171⁄260 150 450

4⁄10 11⁄232⁄10 72070175500

1⁄216⁄10 31⁄271⁄225 75 200 600

Example part number (series & amperage): IDSR 30

Note: All fuses rated 1 amp and above are Indicator

® fuses.

Recommended Fuse Blocks

LR600 series

Refer to the Blocks & Holders section of this catalog for ad di tion al in for ma tion.

Contact Littelfuse for characteristic curves.

POWR-PRO® Fuses

www.littelfuse.com

LDC Series POWR-PRO® Class L Fuses

600 V AC/DC Time-Delay • 150 – 2000 Amperes

Littelfuse POWR-PRO LDC series Class L fuses represent another

first in fuse protection. LDC series fuses are the first UL Listed 600

volts AC and DC Class L fuses. Since they may be used for both

AC and DC, they eliminate the concern that AC only fuses may be

inserted into DC circuits.

While LDC series fuses UL Listed DC interrupting rating is more than

adequate for most applications (50,000 amperes at a 16 millisecond

time constant), tests in our high power laboratory have shown that

this remarkable fuse is capable of performing at much longer time

constants. This makes the fuse uniquely suited for applications such

as crane rail circuits and mass transit systems. Contact the factory for

application information.

For AC only systems, consider the use of POWR-PRO KLPC series

fuses. They have a full 10 seconds time-delay at 500% rated current,

and have a wider range of ratings.

Applications

UPS protection, especially for large battery circuits

DC distribution

DC variable speed drives

Protection of crane rail circuits and other large DC equipment such as

electrical power shovels, ship and dock cranes, etc.

Mass transit systems, including new light rail applications

General purpose AC/DC circuits for mains, feeders, and branch circuits

Features/Benefits

• 600 Volt AC/DC rated — “All-purpose” Class L fuses reduce

inventory requirements because the need for separate AC and DC

fuses is elim i nat ed.

• UL Listed 200,000 A.I.R. AC – 50,000 A.I.R. DC — Reliable

interruption of all overcurrents up to their ratings. Minimizes the need

for time consuming and expensive short-circuit studies.

• Moderate time-delay — Four seconds time-delay at 500% current

provides adequate time-delay for many AC ap pli ca tions and most

DC ap pli ca tions. They will withstand most harmless overloads or line

surges. If your needs exceed the LDC capabilities, consider the use

of KLPC fuses for AC applications.

• Selective coordination — LDC series fuses coordinate well with all

Littelfuse fuses rated 600 amperes or less. A combination of LDC

and IDSR series fuses provide a complete 600 volt rated DC system.

• Extremely current-limiting — Maximum current limitation reduces

damage to circuits and equipment under short-circuit conditions.

Stops damaging short-circuits faster than any mechanical protective

device.

Specifications

Voltage Ratings: AC: 600 Volts

DC: 600 Volts

Interrupting Ratings: AC: 200,000 am peres rms symmetrical

DC: 50,000 amperes

(16 millisecond time-constant)

Ampere Range: 150 – 2000 amperes

Approvals: Standard 248-10, Class L

UL Listed 601 – 2000 amps (File No: E81895)

UL Recognized 150 – 600 amps

(File No: E71611)

CSA Certified 150 – 2000 amps

(File No: LR29862)

Ampere Ratings

150 450 750 1300 1900

200 500 800 1350 2000

250 600 900 1400

300 601 1000 1500

350 650 1100 1600

400 700 1200 1800

Example part number (series & amperage): LDC 1200

Dimensions

Please refer to the KLPC dimensions

POWR-PRO® Fuses

LDC Series POWR-PRO® Class L Fuses

600 V AC/DC Time-Delay • 150 – 2000 Amperes

Current-Limiting Effects of LDC (600V) Fuses

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

100

200

300

400

600

800

1000

800A

1200A

1600A

2000A

TIME IN SECONDS

CURRENT IN AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

2000A

1600A

1200A

800A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

Short-Circuit Current* Apparent RMS Sym met ri cal for Various Fuse Ratings

800A 1200A 1600A 2000A

5,000 5,000 5,000 5,000 5,000

10,000 8,500 10,000 10,000 10,000

15,000 9,750 14,000 15,000 15,000

20,000 10,500 15,000 19,000 20,000

25,000 11,500 16,000 21,000 25,000

30,000 12,000 17,000 22,000 26,000

35,000 12,500 18,000 23,000 28,000

40,000 13,500 19,000 24,000 30,000

50,000 14,000 21,000 26,000 32,000

60,000 15,000 22,000 28,000 34,000

80,000 16,000 24,000 30,000 36,000

100,000 18,000 25,000 33,000 40,000

150,000 20,000 30,000 38,000 44,000

200,000 23,000 32,000 41,000 46,000

* Prospective RMS Sym met ri cal Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

www.littelfuse.com

General Purpose Fuses

KLLU Class L Fuses 26-28

FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses 29-32

FLNR/FLSR Class RK5 Fuses 33

KLNR/KLSR Class RK1 Fuses 34-35

NLN/NLS Class K5 Fuses 36-37

RLN/RLS Class H Fuses 38

JLS Class J Fuses 39-40

JLLN/JLLS POWR-T ™ Class T Fuses 41-43

SLC Class G Fuses 44

Class CC and Class CD Fuses 45-47

Plug Fuses 48

Catalog 25-48.indd 25 5/30/07 6:18:47 PM

General Purpose Fuses

KLLU series UL Listed, time-delay, Class L fus es are quality fuses,

de vel oped to provide a some what lower priced al ter nate to the

POWR-PRO® KLPC series fuses. KLLU series fuses meet or exceed

all UL re quire ments for Class L fus es. For superior protection and

performance, spec i fi ca tion-grade POWR-PRO KLPC series fus es are

the rec om mend ed fuse. Com plete in for ma tion on KLPC fus es may

be found in the POWR-PRO Fuse section of this catalog.

Applications

Service switches

Switchboard mains and feeders

Bolted pressure contact switches

Motor control center mains

Large motor branch circuits

UL Listed series rated protection for molded case circuit breaker

panelboards and loadcenters. See panelboard manufacturers’

literature for recommended fuse rating.

Safety

• 200,000 A.I.R. — Provides reliable in ter rup tion of all overcurrents up

to 200,000 am peres.

• When used for motor branch circuit pro tec tion, KLLU fuses may be

sized close to the motor full load current, providing excellent protection

to branch circuit con duc tors, motor control equip ment and motors.

Longer Equipment Life

• Current-Limiting — Reduces short-circuit damage to systems and

equipment.

• Reduced downtime.

• Ten second minimum time-delay at 500% current eliminates

needless downtime caused by heavy starting currents of large

motors and other in duc tive loads.

• Selective coordination — KLLU fuses co or di nate well with other

Class L fuses and with all current-limiting Littelfuse fuses rated 600

amps or less. This means less time spent trying to locate short-

circuits or over load ed equipment, because only the fuse im me di ate ly

on the line side of the af fect ed circuit opens.

Easy To Use

• 200,000 A.I.R. rating minimizes need for short-circuit cal cu la tions,

while meeting present and future system re quire ments.

• KLLU fuse time-current characteristics closely match typical time-

current curves of circuit breakers. Although fuse/circuit breaker systems

can seldom be 100% coordinated, KLLU series fuses permit use of a

wider range of breaker setting than fast acting Class L fuses.

Ex cel lent protection for a single breaker or a group of breakers.

KLLU Class L Fuses

600 VAC • Time-Delay • 601 – 4000 Amperes

Specifications

Voltage Ratings: AC: 600 Volts

DC: Contact factory

Interrupting Ratings: 200,000 am peres rms symmetrical

Ampere Range: 601 – 4000 amperes

Approvals: Standard 248-10, Class L

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

Ampere Ratings

601 750 1000 1400 1800 3000

650 800 1200 1500 2000 3500

700 900 1350 1600 2500 4000

Example part number (series & amperage): KLLU 1000

Catalog 25-48.indd 26 5/30/07 6:18:52 PM

General Purpose Fuses

www.littelfuse.com

KLLU Class L Fuses

600 VAC • Time-Delay • 601 – 4000 Amperes

FIG.1

AABC

DEF

FIG.2

DEF

ABC

FIG. 3

DEF

ABC

FIG. 4

Amperes Fig.

No.

Dimensions In Inches (mm in parentheses)

ABCDEFGHJKL M N

601 – 800 133⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5) ——

85⁄8

(219.1) —— 2

(50.8)

21⁄2

(63.5)

3⁄8

(9.5)

5⁄8 x 11⁄8

(15.9) x (28.6)

—

801 – 1200 233⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) —— 2

(50.8)

21⁄2

(63.5)

3⁄8

(9.5)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

1201 – 1600 233⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) ——23⁄8

(60.3)

(76.2)

7⁄16

(11.1)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

1601 – 2000 233⁄4

(95.3)

53⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1) —— 23⁄4

(69.9)

31⁄2

(88.9)

1⁄2

(12.7)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

2001 – 2500 3453⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

15⁄8

(41.3)

13⁄4

(44.5)

31⁄2

(88.9)

(127.0)

3⁄4

(19.1)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

2501 – 3000 3453⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

15⁄8

(41.3)

13⁄4

(44.5)

(101.6)

(127.0)

3⁄4

(19.1)

5⁄8 x 3⁄4

(15.9) x (19.1)

5⁄8 x 11⁄8

(15.9) x (28.6)

3001 – 4000 4453⁄4

(146.1)

63⁄4

(171.5)

91⁄4

(235.0)

91⁄2

(241.3)

103⁄4

(273.1)

13⁄4

(44.5)

31⁄4

(82.6)

43⁄4

(120.7)

53⁄4

(146.1)

3⁄4

(19.1)

5⁄8 x 13⁄8

(15.9) x (34.9)

5⁄8 x 13⁄8

(15.9) x (34.9)

Catalog 25-48.indd 27 5/30/07 6:18:54 PM

General Purpose Fuses

KLLU Class L Fuses

600 VAC • Time-Delay • 601 – 4000 Amperes

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

100

200

300

400

600

800

1000

601A

800A

1200A

1600A

2000A

3000A

3500A

4000A

TIME IN SECONDS

CURRENT IN AMPERES SYMMETRICAL R.M.S. AMPERES

AVAILABLE FAULT CURRENT

PEAK LET-THRU IN AMPERES

800A

1200A

1600A

2000A

3000A

4000A

10000000

1000000

100000

10000

1000

100

200000

100000

10000

Current-Limiting Effects of KLLU (600V) fuses

Short-Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings

800A 1200A 1600A 2000A 3000A 4000A

5,000 5,000 5,000 5,000 5,000 5,000 5,000

10,000 10,000 10,000 10,000 10,000 10,000 10,000

15,000 11,900 15,000 15,000 15,000 15,000 15,000

20,000 13,000 18,500 20,000 20,000 20,000 20,000

25,000 14,000 20,000 25,000 25,000 25,000 25,000

30,000 14,500 21,000 26,500 30,000 30,000 30,000

35,000 15,000 22,000 28,500 34,000 35,000 35,000

40,000 16,000 23,000 30,000 35,000 37,000 40,000

50,000 17,000 24,000 32,000 38,000 39,000 44,000

60,000 18,000 26,000 34,000 42,000 43,000 50,000

80,000 19,000 28,000 36,000 44,000 46,000 54,500

100,000 21,000 30,000 38,000 46,000 48,000 57,500

150,000 24,000 35,000 44,000 50,000 51,000 68,000

200,000 26,000 38,000 48,000 53,000 60,000 74,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Catalog 25-48.indd 28 5/30/07 6:18:55 PM

General Purpose Fuses

www.littelfuse.com

Littelfuse FLNR_ID/FLSR_ID Indicator fuses provide blown fuse

indication at a glance. The patented state-of-the-art solid state design

provides maximum reliability and superior performance characteristics

in a true dual-element design. The use of Indicator fuses reduces

downtime and nuisance openings, increases safety, and can save

thousands of dollars in lost production time.

Applications

Service entrance switches

Switchboard main and feeder switches

Motor control center mains and motor branch circuits

Individual fused combination motor controllers

Distribution panelboards

Industrial control panels

Protection of fully rated panelboards and loadcenters

All general purpose circuits

Features/Benefits

• Reduce Downtime — A glance at the indicating window of a FLNR_ID

or FLSR_ID Indicator fuse pinpoints open fuses. If the indicating strip

is black, the fuse has opened. It’s that simple.

• Reduce Nuisance Opening — FLNR_ID and FLSR_ID Indicator

fuses have superior time-delay and cycling characteristics which can

lengthen fuse life and decrease needless opening.

• Reduce Fuse Inventory — Because FLNR_ID and FLSR_ID Indicator

fuses have superior performance characteristics, they can be used on a

variety of ap pli ca tions, thus decreasing fuse inventory.

• Reduce Equipment Damage — FLNR_ID and FLSR_ID Indicator

fuses have superior overload and short-circuit protection which can

reduce equipment damage.

• Reduce Accidents — The FLNR_ID and FLSR_ID Indicator fuses

improve safety by minimizing exposure to live circuits. Unlike other

forms of blown fuse indication, it doesn’t matter if the power is on

or off. No second guessing whether a light means a fuse is good or

bad, and no current going across a blown fuse to power a lighted

accessory.

FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses

250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes

Specifications

Voltage Ratings: AC: 250 Volts (FLNR_ID);

600 Volts (FLSR_ID)

DC: 125 Volts (FLNR 1⁄10 – 30A);

125 Volts (FLNR_ID 35 – 600A);

300 Volts (FLSR_ID)

Interrupting Ratings: AC: 200,000 amperes rms symmetrical

300,000 amperes rms sym met ri cal

(Littelfuse self-certified)

DC: 20,000 amperes

Ampere Range: 1⁄10 – 600 amperes

Approvals: Standard 248-12, Class RK5

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

MSHA 300 Volt Listing (FLSR_ID)

QPL: Federal Specification WF-1814

Ampere Ratings

1⁄10** 6⁄10 18⁄10 483080225

1⁄88⁄10 24

1⁄293590250

15 ⁄100 12

1⁄451040100300

2⁄10 11⁄821⁄256⁄10 12 45 110 350

1⁄411⁄428⁄10 61550125400

3⁄10 14⁄10 36

1⁄4171⁄260 150 450

4⁄10 11⁄232⁄10 72070175500

1⁄216⁄10 31⁄271⁄225 75* 200 600

*FLSR_ID only **FLNR only

Ex am ple part number (series & am per age): FLSR100ID

NOTE: For 1⁄10 – 30 ampere 250 volt fuses, order non-indicating FLNR series fuses.

NOTE: All FLNR_ID fuses rated 35 – 600A are Indicator fuses.

NOTE: All FLSR_ID fuses rated 1 amp and above are Indicator fuses.

Recommended Fuse Blocks

LR250 series (for FLNR_ID series fuses)

LR600 series (for FLSR_ID series fuses)

Refer to Blocks & Holders section of this catalog for ad di tion al in for ma tion.

Catalog 25-48.indd 29 5/30/07 6:18:56 PM

General Purpose Fuses

FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses

250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes

TIME IN SECONDS

CURRENT IN AMPERES

FLSR_ID

.01

.02

.03

.04

.06

.08

100

200

300

400

600

800

1000

10000

8000

6000

4000

3000

2000

1000

800

600

400

300

200

100

1.25A

1.6A

2.5A

10A

15A

20A

25A

30A

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

2/10A

1/4A

3/10A

4/10A

1/2A

6/10A

8/10A

1 1/4A

1 4/10A

2 1/2A

4 1/2A

7 1/2A

FLNR

TIME IN SECONDS

CURRENT IN AMPERES

FDG

70-600A

FIG. 1 FIG. 2

Amperes Refer To

Fig. No. Series Dimensions In Inches (mm in parentheses)

ABCDEFGHJK

1/10 – 30 1 FLNR 2 (50.8)

1⁄2

(12.7)

1⁄2

(12.7)

9⁄16

(14.3)

5⁄64

(2.0)

5⁄32

(4.0)

3⁄8

(9.5) — — —

FLSR_ID 5 (127.0)

3⁄4

(19.1)

5⁄8

(15.9)

13⁄16

(20.6)

3⁄32

(2.4)

3⁄16

(4.8)

5⁄8

(15.9) — — —

35 – 60 1 FLNR_ID 3 (76.2)

3⁄4

(19.1)

5⁄8

(15.9)

13⁄16

(20.6)

3⁄32

(2.4)

3⁄16

(4.8)

5⁄8

(15.9) — — —

FLSR_ID 5

1⁄2

(139.7) 1 (25.4)

5⁄8

(15.9) 1

1⁄16

(27.0)

3⁄32

(2.4)

1⁄4

(6.4)

7⁄8

(22.2) — — —

70 – 100 2 FLNR_ID 5

7⁄8

(149.2) 1 (25.4) 1

1⁄16

(27.0) 1

1⁄16

(27.0)

1⁄8

(3.2)

3⁄4

(19.1) 1

1⁄4

(31.8)

1⁄4

(6.4)

9⁄32

(7.1)

1⁄2

(12.7)

FLSR_ID 7

7⁄8

(200.0) 1

1⁄4

(31.8) 1

1⁄16

(27.0) 1

5⁄16

(33.3)

1⁄8

(3.2)

3⁄4

(19.1) 1

1⁄2

(38.1)

1⁄4

(6.4)

9⁄32

(7.1)

1⁄2

(12.7)

110 – 200 2 FLNR_ID 7

1⁄8

(181.0) 1

1⁄2

(38.1) 1

15 ⁄32

(37.3) 1

19 ⁄32

(40.5)

3⁄16

(4.8) 1

1⁄8

(28.6) 1

27⁄32

(46.8)

7⁄16

(11.1)

9⁄32

(7.1)

11⁄16

(17.5)

FLSR_ID 9

5⁄8

(244.5) 1

3⁄4

(44.5) 1

15 ⁄32

(37.3) 1

27⁄32

(46.8)

3⁄16

(4.8) 1

1⁄8

(28.6) 2

3⁄32

(53.2)

7⁄16

(11.1)

9⁄32

(7.1)

11⁄16

(17.5)

225 – 400 2 FLNR_ID 8

5⁄8

(219.1) 2 (50.8) 1

15 ⁄16

(49.2) 2

3⁄32

(53.2)

1⁄4

(6.4) 1

5⁄8

(41.3) 2

11⁄32

(59.5)

5⁄8

(15.9)

13⁄32

(10.3)

15 ⁄16

(23.8)

FLSR_ID 11

5⁄8

(295.3) 2

1⁄2

(63.5) 2 (50.8) 2

19 ⁄32

(65.9)

1⁄4

(6.4) 1

5⁄8

(41.3) 2

27⁄32

(72.2)

5⁄8

(15.9)

13⁄32

(10.3)

15 ⁄16

(23.8)

450 – 600 2 FLNR_ID 10

3⁄8

(263.5) 2

1⁄2

(63.5) 2

3⁄8

(60.3) 2

19 ⁄32

(65.9)

1⁄4

(6.4) 2 (50.8) 2

27⁄32

(72.2)

3⁄4

(19.1)

17⁄32

(13.5) 1

1⁄8

(28.6)

FLSR_ID 13

3⁄8

(339.7) 3 (76.2) 2

13⁄32

(61.1) 3

3⁄32

(78.6)

1⁄4

(6.4) 2 (50.8) 3

11⁄32

(84.9)

3⁄4

(19.1)

17⁄32

(13.5) 1

1⁄8

(28.6)

For additional application information request Product Bulletin EL-4

Catalog 25-48.indd 30 5/30/07 6:19:03 PM

General Purpose Fuses

www.littelfuse.com

Current-Limiting Effects of FLNR_ID (250V) fuses

Short-Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings

30A 60A 100A 200A 400A 600A

5,000 1,400 2,100 3,100 5,000 5,000 5,000

10,000 1,550 2,500 3,900 6,500 9,500 10,000

15,000 2,000 3,150 4,400 7,250 10,500 14,000

20,000 2,250 3,400 5,000 8,250 12,000 16,000

25,000 2,400 3,750 5,250 9,000 12,500 16,500

30,000 2,550 4,100 5,600 9,500 13,500 18,000

35,000 2,650 4,300 5,800 9,750 14,000 19,000

40,000 2,800 4,400 6,250 10,250 15,000 20,000

50,000 3,000 5,000 6,500 10,500 16,000 21,000

60,000 3,200 5,250 7,000 11,500 17,000 23,000

80,000 3,400 5,750 7,500 12,500 19,000 25,500

100,000 3,850 6,000 8,000 13,500 21,000 27,500

150,000 4,100 7,000 9,000 15,200 24,000 31,500

200,000 4,300 7,500 9,750 16,500 26,000 34,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Current-Limiting Effects of FLSR_ID (600V) fuses

Short-Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings

30A 60A 100A 200A 400A 600A

5,000 1,250 2,100 3,200 5,000 5,000 5,000

10,000 1,600 2,850 4,300 7,250 10,000 10,000

15,000 1,800 3,400 5,000 8,500 13,500 15,000

20,000 2,250 3,800 5,500 9,500 15,750 19,000

25,000 2,450 4,100 5,700 10,250 17,000 21,000

30,000 2,700 4,500 6,400 10,750 18,000 23,000

35,000 2,900 4,800 6,700 11,500 19,000 24,250

40,000 3,000 5,000 7,250 12,000 19,500 27,000

50,000 3,400 5,250 7,750 13,000 21,000 29,000

60,000 3,600 5,750 8,100 14,000 22,000 30,500

80,000 3,900 6,250 9,000 15,000 24,000 33,000

100,000 4,300 6,750 9,750 16,500 26,000 35,000

150,000 4,500 7,600 11,100 19,000 28,000 38,000

200,000 4,600 8,400 12,250 21,500 30,000 40,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses

250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes

Catalog 25-48.indd 31 5/30/07 6:19:05 PM

General Purpose Fuses

FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses

250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes

600A

400A

200A

100A

60A

30A

15A

100

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

1000

800

600

400

300

200

.01

.02

.03

.04

.05

.06

.08

100

200

300

400

600

800

1000

CURRENT IN AMPERES

TIME IN SECONDS

FLSR_ID

600A

400A

200A

100A

60A

1000

800

600

400

300

200

100

1000000

800000

600000

400000

300000

200000

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

.01

.02

.03

.04

.06

.08

100

200

300

400

600

800

1000

TIME IN SECONDS

CURRENT IN AMPERES

FLNR_ID

60A

100A

200A

400A

600A

1000000

800000

600000

400000

300000

200000

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

1000

800

600

400

300

200

100

1000

800

600

400

300

200

100

200000

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

FLNR_ID

PEAK LET - THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

600A

400A

200A

100A

60A

30A

15A

1000000

800000

600000

400000

300000

200000

100000

80000

60000

50000

40000

30000

20000

10000

8000

6000

5000

4000

3000

2000

1000

800

600

400

300

200

100

1000

800

600

400

300

200

100

200000

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

PEAK LET - THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

FLSR_ID

Catalog 25-48.indd 32 5/30/07 6:19:06 PM

General Purpose Fuses

www.littelfuse.com

Littelfuse FLNR/FLSR series fuses have been the superior UL Class

RK5 dual-element time-delay fuses, and are the most widely used class

of fuses. FLNR/FLSR series fuses provide excellent protection for all

types of circuits especially those containing motors. However, users and

specifiers should consider the significant benefits offered by Indicator

fuses. Complete information on these fuses may be found earlier in this

section.

Applications

Service entrance switches

Switchboard main and feeder switches

Motor control center mains and motor branch circuits

Individual fused combination motor controllers

Distribution panelboards

Industrial control panels

Protection of fully rated panelboards and loadcenters

All general purpose circuits

Safety

• 200,000 A.I.R. — Reliable interruption of all overcurrents up to

200,000 amperes.

• Faster acting short-circuit protection than any non-current-limiting

mechanical protective device.

Reliability

• Accurate and reliable — Automated, precision manufactured and

assembled parts ensure accurate, consistent response to overloads

and short-circuits.

Longer Equipment Life

• Reduced damage to equipment caused by heating and magnetic

forces of short-circuits.

• Equipment runs cooler with low-resistance dual-element fuses.

FLNR/FLSR Class RK5 Fuses

250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes

Specifications

Voltage Ratings: AC: 250 Volts (FLNR)

600 Volts (FLSR)

DC: 125 Volts (FLNR)

300 Volts (FLSR)

Interrupting Ratings: AC: 200,000 amperes rms symmetrical

DC: 20,000 amperes

Ampere Range: 1⁄10 – 600 amperes

Approvals: Standard 248-12, Class RK5

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

MSHA 300 Volt Listing (FLSR)

QPL: Federal Specification WF-1814

Dimensions

Refer to FLNR_ID series for FLNR dimensions and FLSR_ID series for FLSR

dimensions.

Ampere Ratings

1⁄10 6⁄10 18⁄10 483080225

1⁄88⁄10 24

1⁄293590250

15 ⁄100 12

1⁄451040100300

2⁄10 11⁄821⁄256⁄10 12 45 110 350

1⁄411⁄428⁄10 61550125400

3⁄10** 14⁄10 36

1⁄4171⁄260 150 450

4⁄10 11⁄232⁄10 72070175500

1⁄216⁄10 31⁄271⁄225 75 200 600

**FLNR only,

Ex am ple part number (series & am per age): FLSR100

Recommended Fuse Blocks

LR250 series (for FLNR series fuses)

LR600 series (for FLSR series fuses)

Refer to Blocks & Holders section of this catalog for ad di tion al in for ma tion.

Catalog 25-48.indd 33 5/30/07 6:19:07 PM

General Purpose Fuses

KLNR/KLSR Class RK1 Fuses

250/600 VAC • Fast Acting • 1 – 600 Amperes

Specifications

Voltage Ratings: AC: 250 Volts (KLNR); 600 Volts (KLSR)

DC: 125 Volts (1 – 600A KLNR);

250 Volts (1 – 30A KLSR);

300 Volts (35 – 600A KLSR).

In ter rupt ing Ratings: AC: 200,000 amperes rms sym met ri cal

DC: 20,000 amperes

Ampere Range: 1 – 600 amperes.

Approvals: AC: Standard 248-12, Class RK1

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

DC: Littelfuse self-certified

Ampere Ratings

11040100250

21245110300

31550125350

42060150400

52570175450

63080200500

83590225600

Example part number (series & amperage): KLNR 200

Recommended Fuse Blocks

LR250 series (for KLNR series fuses)

LR600 series (for KLSR series fuses)

Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

KLNR/KLSR series RK1 fuses were the earliest type of current-limiting

fuses developed. Their single-element, silver link design enables them

to provide fast-acting overload and short-circuit pro tec tion. When used

to protect inductive loads such as motors, solenoids, and trans form ers,

KLNR/KLSR series fuses must be greatly oversized to prevent opening

the fuses on harmless in-rush currents. In such applications, KLNR/

KLSR series fuses may only provide short-circuit pro tec tion.

We recommend using POWR-PRO® LLNRK/LLSRK series Class RK1,

dual-element, time-de lay fuses in all new applications re quir ing the

current-limiting ability of UL Class RK1 fuses. POWR-PRO LLNRK/

LLSRK series fuses are also recommended in existing applications

where fast-acting RK1 or RK5 fuses have been open ing on harmless

system surges such as motor start ing currents.

Applications

Resistance heaters

Lighting circuits

Non-inductive loads

Molded case circuit breaker load centers and panelboards have

increased in ter rupt ing ratings when series rated with Littelfuse

KLNR/KLSR Class RK1 fuses. Refer to panelboard manufacturer’s

literature for UL Listed com bi na tion of fuses and panelboards. Series

ratings up to 200,000 amperes are available.

Safety

• 200,000 A.I.R. — Reliable interruption of all overcurrents up to

200,000 amperes.

• Extremely current-limiting — Stops dam ag ing short-circuit current

faster than any mechanical pro tec tive device.

• Fast-acting — Provides fast acting protection to equipment such

as variable speed drives, rectifiers and other equip ment containing

surge-sensitive com po nents.

Longer Equipment Life

• Current-limiting design reduces damage to equip ment caused by

heating and magnetic effects of short-circuit currents.

Economical

• Extremely current-limiting — often permits use of readily available,

less costly equipment.

• Used as input or output fuses for surge sensitive com po nents such

as variable speed drives and rectifiers, fast acting KLNR/KLSR fuses

may prevent opening of ex pen sive semiconductor fuses protecting

individual components.

Easy To Use

• 200,000 A.I.R. rating min i miz es need for short-circuit calculations.

Dimensions

• Refer to FLNR_ID for KLNR dimensions and FLSR_ID for KLSR

dimensions.

Catalog 25-48.indd 34 5/30/07 6:19:10 PM

General Purpose Fuses

www.littelfuse.com

KLNR/KLSR Class RK1 Fuses

250/600 VAC • Fast Acting • 1 – 600 Amperes

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

KLSRKLNR

Catalog 25-48.indd 35 5/30/07 6:19:13 PM

General Purpose Fuses

NLN/NLS Class K5 Fuses

250/600 VAC • “One-Time” • 1 – 600 Amperes

NLN and NLS series fuses provide low cost protection for general purpose

feeder and branch circuits when avail able short-circuit currents are less

than 50,000 amperes. They replace all Class H fuses which have only a

10,000 ampere interrupting rating. They are suitable for use in many res i-

den tial and smaller commercial and industrial applications.

NLKP series fuses are Canadian “Code” fuses specifically de signed to

meet Canadian Electrical Code Type P fuse re quire ments for residential

use. They have a 10,000 ampere interrupting rating.

However, to obtain the added benefits of time-delay, cur rent-limitation, and

higher interrupting rating, consider the use of POWR-PRO® FLNR_ID and

FLSR_ID Indicator® fuses for circuits up to 600 volts. The user gets all the

benefits of time-delay RK5 fuses plus the added benefits of an indicating

fuse that shows when it has opened. Complete information on these

fuses may be found in the POWR-PRO fuse section of this catalog. For

circuits up to 250 volts, see FLNR fuses in this section of the catalog.

Applications

General purpose residential and commercial circuits with little or no

motor load.

Resistive heating loads.

Economical

• For use in applications where lowest initial cost is the major consideration.

Safety

• 50,000 A.I.R., Class K5 — Adequate in ter rupt ing capacity for

residences and many smaller facilities.

NOTE: NLKP series fuses have limited interrupting rating and should be

used only where available short-circuit current is known to be less than the

fuse interrupting rating. Where available fault current is unknown, where

it exceeds NLN/NLS interrupting rating, or where it may increase in the

future, 200,000 ampere interrupting rating Littelfuse POWR-PRO

FLNR_ID/FLSR_ID Indicator fuses and FLNR/FLSR series fuses provide

superior pro tec tion for all motor and general purpose circuits con tain ing

inductive loads.

Specifications

Voltage Ratings: AC: 250 Volts (NLN, NLKP)

600 Volts (NLS)

DC: 250 Volts (NLN)

400 Volts (NLS 35 – 60A)

500 Volts (NLS 8 – 30A)

(NLS 225 – 600A)

600 Volts (NLS 1 – 7A)

(NLS 70 – 200A)

Interrupting Ratings: AC: 50,000 amperes rms sym met ri cal (NLN/NLS)

10,000 amperes (NLKP)

DC: 20,000 amperes

(NLN/NLS 1 – 60A)

50,000 amperes

(NLN/NLS 70 – 600A)

Ampere Range: 1– 600 amperes (NLN/NLS)

15 – 60 amperes (NLKP)

Ap prov als: NLN/NLS: Standard 248-9, Class K5

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)**

**Excludes NLN 15-60A

NLKP: Standard 248-6, Class H

UL Listed (File No: E81895)

CSA Certified (File No: LR29865)

Meets CSA “Type P” requirements

Ampere Ratings

17*25*60125300

28*3070150350

310*3580175400

412*4090200450

5 *15 *45 100 225 500

6*20*50110250600

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

Example part number (series & amperage): NLS 125

Recommended Fuse Blocks

LH250 series (for NLN and NLKP series fuses)

LH600 series (for NLS series fuses)

Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

Catalog 25-48.indd 36 5/30/07 6:19:13 PM

General Purpose Fuses

www.littelfuse.com

NLN/NLS Class K5 Fuses

250/600 VAC • “One-Time” • 1 – 600 Amperes

CURRENT IN AMPERES

TIME IN SECONDS

NLS

600A

.01

.02

.03

.04

.05

.06

.08

100

200

300

400

600

800

1000

100

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

1000

800

600

400

300

200

400A

200A

100A

60A

30A

25A

20A

15A

TIME IN SECONDS

CURRENT IN AMPERES

NLN

.01

.02

.03

.04

.06

.08

100

200

300

400

600

800

1000

100

100000

80000

60000

40000

30000

20000

10000

8000

6000

4000

3000

2000

1000

800

600

400

300

200

200A

100A

400A

600A

60A

30A

25A

20A

15A

BFD G

FIG. 1 FIG. 2

Amperes Refer to

Fig. No. Series Dimensions In Inches (mm in parentheses)

ABCDEFG

1 – 30 1

NLN

NLKP 2 (50.8) 1⁄2 (12.7) 1⁄2 (12.7) 9⁄16 (14.3) — — —

NLS 5 (127.0) 3⁄4 (19.1) 5⁄8 (15.9) 13 ⁄16 (20.6) — — —

35 – 60 1

NLN

NLKP 3 (76.2) 3⁄4 (19.1) 5⁄8 (15.9) 13 ⁄16 (20.6) — — —

NLS 51⁄2 (139.7) 1 (25.4) 5⁄8 (15.9) 11⁄16 (27.0) — — —

70 – 100 2 NLN 57⁄8 (149.2) 1 (25.4) 1 (25.4) 11⁄16 (27.0) 1⁄8 (3.2) 3⁄4 (19.1) 15⁄16 (33.3)

NLS 77⁄8 (200.0) 11⁄4 (31.8) 1 (25.4) 15⁄16 (33.3) 1⁄8 (3.2) 3⁄4 (19.1) 19⁄16 (39.7)

110 – 200 2 NLN 71⁄8 (181.0) 11⁄2 (38.1) 13⁄8 (34.9) 19⁄16 (39.7) 3⁄16 (4.8) 11⁄8 (28.6) 17⁄8 (47.6)

NLS 95⁄8 (244.5) 13⁄4 (44.5) 13⁄8 (34.9) 127⁄32 (46.8) 3⁄16 (4.8) 11⁄8 (28.6) 23⁄32 (53.2)

225 – 400 2 NLN 85⁄8 (219.1) 2 (50.8) 17⁄8 (47.6) 23⁄32 (53.2) 1⁄4 (6.4) 15⁄8 (41.3) 213 ⁄32 (61.1)

NLS 115⁄8 (295.3) 21⁄2 (63.5) 17⁄8 (47.6) 219 ⁄32 (65.9) 1⁄4 (6.4) 15⁄8 (41.3) 27⁄8 (73.0)

450 – 600 2 NLN 103⁄8 (263.5) 21⁄2 (63.5) 21⁄4 (57.2) 219 ⁄32 (65.9) 1⁄4 (6.4) 2 (50.8) 27⁄8 (73.0)

NLS 133⁄8 (339.7) 3 (76.2) 21⁄4 (57.2) 33⁄32 (78.6) 1⁄4 (6.4) 2 (50.8) 37⁄16 (87.3)

Catalog 25-48.indd 37 5/30/07 6:19:16 PM

General Purpose Fuses

RLN/RLS Class H Fuses

250/600 VAC • Renewable • 1 – 600 Amperes

Littelfuse RLN/RLS series renewable fuses are a quality product that

have traditionally been used to provide low cost protection of general

purpose feeder and branch circuits where available short-circuit currents

do not exceed 10,000 amperes. However, increased levels of available

fault current and the possibility that renewable fuses may be im prop erly

renewed is a potential safety hazard. In addition, escalating labor costs

and increasing automation, which makes down time very expensive,

have greatly re duced or eliminated the cost savings attributed to

renewable fuses.

We recommend the use of POWR-PRO® FLSR_ID series Indicator®

fuses for circuits between 250 and 600 volts and FLNR_ID series for

circuits 250 volts and below. Complete information on POWR-PRO

Indicator fuses may be found in the POWR-PRO fuse section of this

catalog. FLNR fuses are in this section of the catalog.

Cost Considerations

• When comparing the cost of using re new able fuses with the cost of

other fuses, the labor required for replacing links and the cost of ad di-

tion al downtime should be included.

Cautions

• Renewable fuses should only be used where short-circuit currents

are known to be less than 10,000 amperes, and where correct

replacement of open links is assured.

• After disassembly of fuse, examine carefully. Discard any fuses

which show evidence of weak ened tube or damaged components.

• Remove all link residue from fuse tube.

• Carefully clean all contact surfaces, and remove metal spatter from

all surfaces.

• Install the proper rated fuse link and tighten all con nec tions

securely.

• Vi su al ly ex am ine fuses for cor rect align ment of blades.

Dimensions

• For dimensions, please refer to NLN series for RLN di men sions and

NLS series for RLS dimensions.

Specifications

Voltage Ratings: AC: 250 Volts (RLN); 600 Volts (RLS)

In ter rupt ing Ratings: AC: 10,000 am peres rms sym met ri cal

Ampere Range: 1 – 600 amperes

Ap prov als: Standard 248-6, Class H

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

FUSE LINKS: To order, specify LKN (250V) or LKS (600V) plus

ampere rating.

Ampere Ratings

16204590175350*

28**2550100200400*

3103060110225*450*

4 12** 35 70 125 250* 500*

5154080150300*600*

*These ampere ratings require two links per fuse.

**RLS Only.

Example part number (series & amperage): RLN 20

Recommended Fuse Blocks

LH250 series (for RLN series fuses)

LH600 series (for RLS series fuses)

Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

Catalog 25-48.indd 38 5/30/07 6:19:18 PM

General Purpose Fuses

www.littelfuse.com

JLS Class J Fuses

600 VAC • Fast Acting • 1 – 600 Amperes

Specifications

Voltage Ratings: 600 Volts AC

Interrupting Ratings: 200,000 amperes rms symmetrical

Ampere Range: 1 – 600 amperes

Approvals: Standard 248-8, Class J

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

QPL: Federal Specification No: WF-1814

Ampere Ratings

12560125300

33070150350

63580175400

10 40 90 200 450

15 45 100 225 500

20 50 110 250 600

Example part number (series & amperage): JLS 110

Recommended Fuse Blocks

LPSJ series, LJ600 series

Refer to the Blocks and Holders section of this catalog for additional in for ma tion.

JLS series fuses provide space saving, fast acting overload and short-

circuit protection for non-inductive loads. When used for motors or other

inductive loads, the ampere rating of JLS series fuses must be increased

to prevent nuisance opening on in-rush currents. In such applications, JLS

fuses may provide only short-circuit protection. Con sid er using Littelfuse

POWR-PRO® JTD or JTD_ID series time-delay fuses in such circuits.

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.

Space Saving

• JLS fuse characteristics are similar to KLNR/KLSR fast acting Class

RK1 fuses, but dimensionally are much smaller.

Safety

• 200,000 A.I.R. — Reliable interruption of all overcurrents up to

200,000 amperes.

• Extremely current-limiting — Stops dam ag ing short-circuit current

faster than any mechanical pro tec tive device.

• Fast acting — Provides fast acting protection to equipment such as

variable speed drives, rectifiers and other equip ment containing surge

sensitive com po nents.

Longer Equipment Life

• Current-limiting design reduces damage to equip ment caused by

heating and magnetic effects of short-circuit currents.

Economical

• Extremely current-limiting design often permits use of readily

available, less costly equipment.

• Manufacturers of equipment containing dual voltage devices can

simplify manufacturing and reduce inventory by stan dard iz ing on 600

volt JLS fuses and Class J fuse blocks for all AC voltage ratings.

Easy to use

• 200,000 A.I.R. rating minimizes need for short-circuit cal cu la tions.

NOTE: Littelfuse JLS fuses are not time-delay fuses. For ap pli ca tions

where short-duration surg es and spikes may cause nuisance fuse

opening, consider the use of Littelfuse POWR-PRO JTD or JTD_ID

series time-delay fuses.

Catalog 25-48.indd 39 5/30/07 6:19:20 PM

General Purpose Fuses

JLS Class J Fuses

600 VAC • Fast Acting • 1 — 600 Amperes

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

DGF

Fig. 1 Fig. 2

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

Amperes Refer to

Fig. No.

Dimensions In Inches (mm in parentheses)

AB CDEFGH

1 – 30 1 21⁄4 (57.2) — 1⁄2 (12.7) 13 ⁄16 (20.6)————

35 – 60 1 23⁄8 (60.3) — 5⁄8 (15.9) 11⁄16 (27.0)————

70 – 100 2 25⁄8 (66.7) 317⁄32 (89.7) 323⁄32 (94.5) 45⁄8 (117.5) 1 (25.4) 3⁄4 (19.1) 9⁄32 (7.1) 1⁄8 (3.2)

110 – 200 2 3 (76.2) 49⁄32 (108.7) 415 ⁄32 (113.5) 53⁄4 (146.1) 11⁄2 (38.1) 11⁄8 (28.6) 9⁄32 (7.1) 3⁄16 (4.8)

225 – 400 2 33⁄8 (85.7) 51⁄8 (130.2) 53⁄8 (136.5) 71⁄8 (181.0) 2 (50.8) 15⁄8 (41.3) 13⁄32 (10.3) 1⁄4 (6.4)

450 – 600 2 33⁄4 (95.3) 527⁄32 (148.4) 65⁄32 (156.4) 8 (203.2) 21⁄2 (63.5) 2 (50.8) 17⁄32 (13.5) 3⁄8 (9.5)

Catalog 25-48.indd 40 5/30/07 6:19:22 PM

General Purpose Fuses

www.littelfuse.com

JLLN/JLLS POWR-T™ Class T Fuses

300/600 VAC • Fast-Acting • 1 – 1200 Amperes

Specifications

Voltage Ratings: AC: 300 Volts (JLLN); 600 Volts (JLLS)

DC: 125 Volts (JLLN 1 – 30A)

160 Volts (JLLN 35 – 60A)

125 Volts (JLLN 110 – 1200A)

300 Volts (JLLS)

Interrupting Ratings: AC: 200,000 amperes rms symmetrical

DC: 20,000 amperes

(JLLN 110 – 1200A)

(JLLS 1 – 1200A)

Ampere Range: 1– 1200 amperes

Approvals: AC: Standard 248-15, Class T

UL Listed (File No: E81895):

JLLN/JLLS (1 – 800A)

UL Recognized (File No: E71611):

JLLS (900 – 1200A)

CSA Certified (File No: LR29862):

JLLN/JLLS (1 – 600A)

DC: UL Listed (File No: E81895):

JLLN (110 – 1200A)

Littelfuse self-certified: JLLN 1-60A

JLLS (1 – 1200A)

Ampere Ratings

13090250800

2 35 100 300 900*

3 40 110 350 1000

6451254001100

10 50 150 450 1200

15 60 175 500

20 70 200 600

25 80 225 700

* JLLS only

Example part number (series & amperage): JLLS 100

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

Recommended Fuse Blocks

LT300 series (for JLLN series fuses)

LT600 series (for JLLS series fuses)

LSCR002 (for JLLN/JLLS 700-1200A fuses)

Refer to the Blocks and Holders section of this catalog for additional in for ma tion.

Space saving POWR-T fuses are the most compact fuses available in

ratings above 30 amperes — less than one-third the size of comparable

Class R fuses. When rated in ac cor dance with the NEC®, POWR-T fuses

provide fast acting overload and short-circuit protection for non-inductive

circuits and equipment. Used in inductive circuits, the ampere rating of

POWR-T fuses must be increased to prevent opening on in-rush currents.

In such instances, POWR-T fuses may provide only short-circuit protection.

Applications

Littelfuse Class T fuses can be used in applications that require fast-

acting protection, such as equipment containing variable speed drives,

rectifiers, and other surge-sensitive components. Main switches

containing Class T fuses may be used to provide protection to individual

electric services and meter stacks. Molded case circuit breaker load

centers and Panelboards also will have increased interrupting ratings

when “series rated” with Class T fuses.

Features/Benefits

Space-Saving – Switch enclosures, fuse pullouts, and other equipment

using Class T fuses are usually more compact. Typical three-pole Class

T fuse blocks require less than 50% of the panel space required by

similar Class R blocks.

Longer Equipment Life and Increased Safety – Class T fuses provide

fast, reliable protection against overcurrents up to 200,000 amperes.

Extremely current-limiting design minimizes the damaging heating and

magnetic effects caused by short-circuit currents.

Optional Mounting Types – In addition to the Class T dimensions,

Littelfuse offers select ratings with PC board mounting tabs for specialty

applications. PC board mount versions are UL Recognized. Contact the

factory for more information.

NOTE: JLLN Class T 300 volt fuses are UL Listed for circuits not

exceeding 300 volts to ground. However, since UL does not include

testing 300 volt Class T fuses on 277/480 volt three-phase bolted faults,

Littelfuse does not rec om mend using 300 volt Class T fuses where

phase-to-phase voltage exceeds 300 volts.

Catalog 25-48.indd 41 5/30/07 6:19:23 PM

General Purpose Fuses

JLLN/JLLS POWR-T™ Class T Fuses

300/600 VAC • Fast Acting • 1 – 1200 Amperes

Fig. 1 Fig. 2 Fig. 3

Amperes Refer to

Fig. No. Series Dimensions in Inches (mm in parentheses)

ABCDE FG

1 – 30 1 JLLN 7⁄8 (22.2) — 9⁄32 (7.1) 13⁄32 (10.3) — — —

JLLS 11⁄2 (38.1) — 9⁄32 (7.1) 9⁄16 (14.3) — — —

35 – 60 1JLLN

7⁄8 (22.2) — 9⁄32 (7.1) 9⁄16 (14.3) — — —

2JLLS1

9⁄16 (39.7) 13 ⁄16 (20.6) 13 ⁄32 (10.3) 1 (25.4) 1⁄16 (1.6) 13⁄32 (27.8) —

70 – 100 3 JLLN 25⁄32 (54.8) 19⁄16 (39.7) 3⁄4 (19.1) 13⁄16 (20.6) 27⁄32 (21.4) 9⁄32 (7.1) 1⁄8 (3.2)

JLLS 261⁄64 (75.0) 223⁄64 (59.9) 3⁄4 (19.1) 13 ⁄16 (20.6) 141⁄64 (41.7) 9⁄32 (7.1) 1⁄8 (3.2)

110 – 200 3 JLLN 27⁄16 (61.9) 111⁄16 (42.9) 7⁄8 (22.2) 11⁄16 (27.0) 27⁄32 (21.4) 11 ⁄32 (8.7) 3⁄16 (4.8)

JLLS 31⁄4 (82.6) 21⁄2 (63.5) 7⁄8 (22.2) 11⁄16 (27.0) 121⁄32 (42.1) 11⁄32 (8.7) 3⁄16 (4.8)

225 – 400 3 JLLN 23⁄4 (69.9) 127⁄32 (46.8) 1 (25.4) 15⁄16 (33.3) 53⁄64 (21.0) 13 ⁄32 (10.3) 1⁄4 (6.4)

JLLS 35⁄8 (92.1) 223⁄32 (69.1) 1 (25.4) 119 ⁄32 (40.5) 123⁄32 (43.7) 13⁄32 (10.3) 1⁄4 (6.4)

450 – 600 3 JLLN 31⁄16 (77.8) 21⁄32 (51.6) 11⁄4 (31.8) 119 ⁄32 (40.5) 7⁄8 (22.2) 31⁄64 (12.3) 5⁄16 (7.9)

JLLS 363⁄64 (101.2) 261⁄64 (75.0) 11⁄4 (31.8) 21⁄16 (52.4) 149⁄64 (44.8) 31⁄64 (12.3) 5⁄16 (7.9)

700 – 800 3 JLLN 33⁄8 (85.7) 27⁄32 (64.3) 13⁄4 (44.5) 21⁄16 (52.4) 7⁄8 (22.2) 35⁄64 (13.9) 3⁄8 (9.5)

JLLS 421⁄64 (109.9) 311⁄64 (80.6) 13⁄4 (44.5) 21⁄2 (63.5) 155⁄64 (47.2) 35⁄64 (13.9) 3⁄8 (9.5)

900 – 1200 3 JLLN 4 (101.6) 217⁄32 (64.3) 2 (50.8) 21⁄2 (63.5) 11⁄32 (26.2) 39⁄64 (15.5) 7⁄16 (11.1)

JLLS 5.27 (133.9) 3.80 (96.5) 2 (50.8) 2.63 (66.8) 2.30 (58.4) 0.67 (15.5) 0.44 (11.2)

Current-Limiting Effects of JLLS (600V) fuses

Short

Circuit

Current*

Apparent RMS Symmetrical Current for Various fuse ratings

30A 60A 100A 200A 400A 600A 800A 1200A

5,000 750 1,225 1,400 2,850 4,600 5,000 5,000 5,000

10,000 945 1,525 1,700 3,600 6,000 8,500 9,400 10,000

15,000 1,050 1,700 2,000 4,050 6,600 9,750 10,500 13,000

20,000 1,150 1,900 2,200 4,450 7,250 10,500 11,000 14,750

25,000 1,300 2,050 2,400 4,800 8,000 11,500 12,500 15,500

30,000 1,375 2,150 2,450 5,000 8,250 12,000 13,750 16,500

35,000 1,400 2,250 2,600 5,100 8,500 13,000 14,000 17,000

40,000 1,425 2,400 2,800 5,200 8,700 14,000 14,750 18,000

50,000 1,600 2,450 2,900 6,000 9,500 14,500 16,000 20,000

60,000 1,650 2,625 3,100 6,250 10,000 15,500 17,300 21,000

80,000 1,825 2,800 3,400 7,000 11,000 17,000 18,750 23,000

100,000 2,000 3,100 3,700 7,250 12,000 18,000 20,000 25,000

150,000 2,250 3,400 4,300 8,500 13,000 21,000 23,000 28,500

200,000 2,450 3,800 4,600 9,000 15,000 23,000 25,000 31,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Current-Limiting Effects of JLLN (300V) fuses

Short

Circuit

Current*

Apparent RMS Symmetrical Current for Various fuse ratings

30A 60A 100A 200A 400A 600A 800A 1200A

5,000 700 775 1,100 1,650 3,500 4,000 5,000 5,000

10,000 900 1,000 1,400 2,100 4,400 5,100 6,750 8,250

15,000 1,000 1,100 1,600 2,400 5,000 5,900 7,750 10,000

20,000 1,100 1,250 1,800 2,700 5,500 6,500 8,750 11,000

25,000 1,230 1,300 1,950 2,900 6,000 7,000 9,500 12,000

30,000 1,300 1,475 2,050 3,100 6,400 7,500 10,000 12,500

35,000 1,330 1,575 2,150 3,300 6,750 7,750 10,500 13,500

40,000 1,430 1,600 2,300 3,500 7,000 8,000 11,000 14,000

50,000 1,500 1,750 2,400 3,700 7,500 8,750 12,000 15,000

60,000 1,700 1,900 2,700 4,000 8,000 9,500 12,500 16,000

80,000 1,850 2,100 2,800 4,400 9,000 10,500 14,000 17,500

100,000 2,000 2,250 3,150 4,800 9,750 11,500 15,000 18,500

150,000 2,300 2,600 3,600 5,500 11,000 13,000 17,500 22,000

200,000 2,600 2,800 3,900 6,000 12,000 14,500 19,500 24,000

* Prospective RMS Symmetrical Amperes Short-Circuit Current

Note: Data Derived from Peak Let-Thru Curves

Catalog 25-48.indd 42 5/30/07 6:19:26 PM

General Purpose Fuses

www.littelfuse.com

JLLN/JLLS POWR-T™ Class T Fuses

300/600 VAC • Fast Acting • 1 – 1200 Amperes

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

30A

60A

100A

200A

400A

600A

800A

1200A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

30A

60A

100A

200A

400A

600A

800A

TIME IN SECONDS

CURRENT IN AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

1200A

800A

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

800A

600A

400A

200A

100A

60A

30A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

JLLSJLLN

Catalog 25-48.indd 43 5/30/07 6:19:28 PM

General Purpose Fuses

SLC Class G Fuses

480 VAC, 600 VAC • Medium Time-Delay • 1/2 – 60 Amperes

The compact design of Littelfuse SLC series Class G fuses offers a cost

effective, space saving alternative to other fuse classes. The unique

design of the SLC series provides superior time-delay characteristics

over competitive products, which can increase system reliability and

minimize downtime. Class G fuses meet NEC requirements for branch

circuit protection and vary in length to prevent over-fusing when used

with the appropriate Class G fuse block.

Features/Benefits

• Current-limiting – Reduces damage to equipment caused by heating

and magnetic effects of short-circuit currents.

• 100,000 A.I.R. – Reliable interruption of all overcurrents up to

100,000 amperes.

• Time-Delay – Allows fuses to be sized closer to actual equipment

requirements and may reduce downtime caused by power surges.

Note: For ap pli ca tions where greater time-delay is re quired, or where

ratings exceed 60 am peres, con sid er se lect ing Littelfuse time-delay

Class RK1, RK5, J or CC fuses.

Specifications

Voltage Ratings: 600 Volts AC (1⁄2 – 20A)

480 Volts AC (25 – 60A)

Interrupting Ratings: 100,000 amperes rms symmetrical

Ampere Range: 1⁄2 – 60 amperes

Ap prov als: Standard 248-5, Class G

UL Listed (File No: E81895)

CSA Certified (File No: LR29862)

QPL: Federal Specification No: WF-1814

Ampere Ratings

1⁄236153045

148203550

2510254060

Example part number (series & amperage): SLC 10

Recommended Fuse Blocks

LG300 series; L300G30 (for 25 and 30 amp fuses)

Refer to the Blocks & Holders section of this catalog for additional information.

Amperes Refer to

Fig. No.

Dimensions in Inches (mm in parentheses)

ABCD

1⁄2 – 15 1 15⁄16 (33.3) 3⁄8 (9.5) 9⁄32 (7.1) 13 ⁄32 (10.3)

20 1 113 ⁄32 (35.7) 3⁄8 (9.5) 9⁄32 (7.1) 13 ⁄32 (10.3)

25, 30 1 15⁄8 (41.3) 3⁄8 (9.5) 9⁄32 (7.1) 13 ⁄32 (10.3)

35 – 60 1 21⁄4 (57.2) 3⁄8 (9.5) 1⁄2 (12.7) 13 ⁄32 (10.3)

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

1/2A

10A

12A

15A

20A

25A

30A

35A

40A

45A

50A

60A

TIME IN SECONDS

CURRENT IN AMPERES

Fig. 1

Catalog 25-48.indd 44 5/30/07 6:19:29 PM

General Purpose Fuses

www.littelfuse.com

Class CC and Class CD Fuses

600 VAC • 1/10 – 60 Amperes

Compared to other UL Listed fuses, Class CC has the most current-

limiting fuse design available, rating for rating. Be cause they are

physically compact, they provide this superior protection in a fraction

of the space required by other fuse classes. For example, when 600V

three-pole, 30 ampere Class R fuse blocks are replaced by Littelfuse

Class CC fuse blocks, panel mounting space is reduced ap proximate ly

70%. This is especially important when a panel contains many fuses to

protect multiple circuit components.

Applications

Three types of Class CC fuses, specifically designed to protect different

types of components

1) Motor protection — CCMR series; dual-element, time-delay fuses

specifically designed to protect motor circuits up to 40 HP**.

2) Small transformer protection (control power transformers) — KLDR

series, time-delay fuses designed to withstand the high magnetizing

in-rush of transformers.

3) General purpose protection of equipment requiring fast overload

protection — KLKR series, fast-acting fuses used for protection

of equip ment containing solid-state devices or other electronic

components requiring fast response on overloads.

Safety

• 200,000 A.I.R. — Reliable interruption of all overcurrents up to

200,000 amperes.

• Extremely current-limiting — Reduces damage caused by heating

and magnetic effects of short-circuit currents. Stops damaging short-

circuit currents faster than any me chani cal protective device.

Space Saving

• Class CC and CD fuses are the smallest 600V, 200,000 A.I.R. fuses

approved for branch circuit protection.

Economical

• Current-limiting design often permits use of readily avail able, less

costly equipment.

Specifications

Voltage Ratings: AC: 600 Volts

DC: 250 – 500 Volts (CCMR) †

300 Volts (KLDR)

300 Volts (KLKR)

Interrupting Ratings: AC: 200,000 amperes

rms symmetrical

DC: 20,000 amperes

Ampere Range: CCMR:

2⁄10 – 60 amperes

KLDR:

1⁄10 – 30 amperes

KLKR:

1⁄10 – 30 amperes

Approvals: AC: Standard 248-4, Class CC

UL Listed

1⁄10-30 Amps (File No: E81895)

Standard 248, Class CD

UL Listed 35-60 Amps (File No: E71611)

CSA Certified

1⁄10-30 Amps

(File No: LR29862)

DC: Littelfuse Self-certified

Recommended Fuse Blocks

LPSC series (for 1⁄10 –30A)

L60030C series (for 1⁄10 –30A)

L60060C series (for CCMR 35–60A)

Refer to the Blocks and Holders section of this catalog for ad di tion al in for ma tion.

†Refer to the POWR-PRO® section for additional information.

1.880 REF.

.850

-.020

35-60A

** Consult the Motor Protection Tables in the Fuseology section for specific

motor sizing information

1.50"

(38.1 mm)

.50"

(12.7 mm)

.41"

(10.3 mm)

.25"

(6.4 mm)

.125"

(3.2 mm)

0-30A

Catalog 25-48.indd 45 5/30/07 6:19:32 PM

General Purpose Fuses

Class CC and Class CD Fuses

600 VAC • 1/10 – 60 Amperes

For space saving protection of motor

circuits up to 40 HP**, we recommend

Littelfuse POWR-PRO® CCMR series fuses.

These fuses are the only true dual-element

time-delay CC fuses specifically en gi neered

for motor branch circuit pro tec tion. They pro vide

Type 2 “No Damage” pro tec tion to both

NEMA-rated and the more sensitive IEC

(International Electrotechnical Commission)

type motor circuit components.

CCMR series fuses are now available in larger

sizes — from 35 to 60 amperes! No other

600V fuse is avail able with this current

carrying capacity in a package this small.

For more information on CCMR series Class

CC fuses, see the CCMR series pages in the

POWR-PRO section of this catalog.

1⁄10 – 30A: UL Listed Class CC

35 – 60A: UL Listed Class CD

KLDR fuses are time-delay fuses specifically

designed for the protection of control

transformers, so le noids and similar inductive

com ponents with high mag ne tiz ing currents

during the first half-cycle. They closely match

most control power transformer characteristics,

which permits the fuses to be sized in

ac cor dance with the latest revisions of UL 508

(Industrial Control) and UL 845 (Motor Control

Centers). When the time delay of KLDR fuses

is adequate to carry motor starting current, they

provide ex cel lent protection of motor branch

circuits con tain ing IEC or NEMA rated motor

con trol lers or contactors.

CCMR Series

KLKR Series

KLDR Series

KLKR series Class CC fuses are fast acting

fuses intended for general purpose branch

circuit protection. Their compact size, fast

acting overload response, and highly current-

limiting design make them ideal for use in

OEM equipment and control panels. Solid state

devices such as SCRs and other electronic

equipment generally require fast acting

protection.

Ampere Ratings

2⁄10 11⁄421⁄25930

1⁄414⁄10 28⁄10 56⁄10 10 35

3⁄10 11⁄2361240

1⁄216⁄10 32⁄10 61⁄415 45

6⁄10 18⁄10 31⁄2717

1⁄250

8⁄10 247

1⁄220 60

1⁄441⁄2825

Example part number (series & amperage): CCMR 30

**Consult the Motor Protection Tables in the Fuse-

ology section for specific motor sizing information

Ampere Ratings

1⁄10 6⁄10 18⁄10 41⁄210

1⁄83⁄42512

15 ⁄100 8⁄10 21⁄456⁄10 15

⁄16 12

1⁄2617

1⁄2

2⁄10 11⁄828⁄10 61⁄420

1⁄411⁄43725

3⁄10 14⁄10 32⁄10 71⁄230

4⁄10 11⁄231⁄28

1⁄216⁄10 49

Example part number (series & amperage): KLDR 5 6⁄10

Ampere Ratings

1⁄10 1⁄221⁄2612

1⁄83⁄43715

2⁄10 13

1⁄2820

1⁄411⁄24925

3⁄10 251030

Example part number (series & amperage): KLKR 25

Catalog 25-48.indd 46 5/30/07 6:19:36 PM

General Purpose Fuses

www.littelfuse.com

Class CC and Class CD Fuses

600 VAC • 1/10 – 60 Amperes

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

1/8A

2/10A

3/10A

1/2A

6/10A

3/4A

1.8A

2 1/2A

6 1/4A

10A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

1/10A

1/8A

2/10A

1/4A

3/10A

1/2A

3/4A

1 1/2A

10A

12A

15A

20A

25A

30A

TIME IN SECONDS

CURRENT IN AMPERES

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

10A

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

100

200

300

400

600

800

1000

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

300000

400000

600000

800000

1000000

30A

25A

20A

15A

12A

PEAK LET-THRU IN AMPERES

AVAILABLE FAULT CURRENT

SYMMETRICAL R. M. S. AMPERES

For performance data on Littelfuse CCMR series Class CC fuses, see the CCMR pages in the POWR-PRO® section of this catalog.

KLDR KLKR

Catalog 25-48.indd 47 5/30/07 6:19:42 PM

General Purpose Fuses

Plug Fuses

125 VAC • Time-Delay • 1/4 – 30 Amperes

Edison-base Plug fuses

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. Use for replacement purposes only.

Ampere Ratings

3⁄10 11⁄821⁄44715

4⁄10 11⁄421⁄241⁄2820

1⁄214⁄10 28⁄10 5925

6⁄10 16⁄10 35

6⁄10 10 30

8⁄10 18⁄10 32⁄10 612

123

1⁄261⁄414

TLO Fuses are medium time-delay Edison-base fuses designed for general

purpose branch circuit protection. See TOO and SOO fuses for motor

protection. Use for re place ment purposes only.

Ampere Ratings

15 20 25 30

Type S Plug fuses

SOO Fuses are dual-element time-delay Type S fuses designed for motor and

motor branch circuit protection; also suitable for all general purpose circuits.

Ampere Ratings

1⁄4123

1⁄261⁄414

3⁄10 11⁄821⁄44715

4⁄10 11⁄421⁄241⁄2820

1⁄214⁄10 28⁄10 5925

6⁄10 16⁄10 35

6⁄10 10 30

8⁄10 18⁄10 32⁄10 612

SLO Fuses are medium time-delay Type S fuses for general purpose branch

circuit protection.

Ampere Ratings

15 20 25 30

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. Type S

Plug fuses (SOO and SLO series) utilize a nonmetallic threaded base and

must be used with Type S adapters (SAO series). 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.

SAO

Adapter Rating

Accepts

Fuse Ratings:

Other SOO Fuse

Ratings Which Fit

SAO 1 3⁄10 – 1 —

SAO 11⁄411⁄8, 11⁄43⁄10 – 1

SAO 16⁄10 14⁄10, 16⁄10 3⁄10 – 11⁄4

SAO 2 18⁄10, 2 —

SAO 21⁄221⁄4, 21⁄218⁄10, 2

SAO 32⁄10 28⁄10, 32⁄10 18⁄10 – 21⁄2

SAO 4 31⁄2, 4 —

SAO 5 41⁄2, 5 31⁄2, 4

SAO 61⁄431⁄2, 61⁄431⁄2 – 5

SAO 8 7, 8 —

SAO 15 7, 8, 9 10, 12, 14, 15 7, 8, 9, 10

SAO 20 20 only —

SAO 30 20, 25, 30 —

Specifications

Voltage Rating: 125 VAC

Interrupting Rating: 10,000 amperes rms symmetrical

Approvals: UL Listed Plug Fuses, Standard UL 248-11

Note: See NEC Article 240-V for additional information on Plug fuse applications.

Catalog 25-48.indd 48 5/30/07 6:19:43 PM

www.littelfuse.com

Midget & Electronic Fuses

www.littelfuse.com

Midget Fuses 50-54

Electronic Fuses 55-59

Automotive Fuses 60-62

Catalog 49-62.indd 49 5/30/07 6:27:10 PM

Midget & Electronic Fuses

50 www.littelfuse.com

Midget & Electronic Fuses

Midget Fuses

Supplementary Overcurrent Protection

Fast-acting, high-in ter rupt ing capacity, current-lim it-

ing type fuse. Especially suited for control circuits,

street lighting, H.I.D. light ing, computers, and other

applications without high in-rush currents.

Voltage Rating: 600 Volts AC

500 Volts DC

Interrupting Rating: UL Listed 100,000 amperes rms

symmetrical

(Capable of 200,000 amperes)

Di men sions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): KLK 1

1⁄2

Ampere Ratings:

1⁄10 1515

1⁄811⁄2620

2⁄10 2725

1⁄421⁄2830

3⁄10 39

1⁄231⁄210

3⁄4412

Approvals: Standard 248-14

UL Listed 3/10-30A (File No: E10480)

CSA Certified 3/10-30A (File No: LR29862)

Ampere Ratings:

1⁄10 11⁄838

15 ⁄100 11⁄432⁄10 9

2⁄10 14⁄10 31⁄210

1⁄411⁄2412

3⁄10 16⁄10 41⁄215

4⁄10 18⁄10 520

1⁄225

6⁄10 25

6⁄10 21⁄4630

8⁄10 21⁄261⁄4

8⁄10 7

Approvals: Standard 248-14

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

Ampere Ratings:

1⁄10 1515

1⁄811⁄2620

2⁄10 2725

1⁄421⁄2830

3⁄10 39

1⁄231⁄210

3⁄4 412

Approvals: Standard 248-14

UL Listed 3/10-30A (File No: E10480)

CSA Certified 3/10-30A (File No: LR29862)

Versions avail able to meet

MIL-F-5160/60, QPL F60C:

Contact Factory.

Fast acting, high in ter rupt ing capacity, current-

lim it ing type fuse. Especially suited for DC control

circuits, street lighting, H.I.D. light ing, computers,

and other applications.

Voltage Rating: 600 Volts AC/DC

Interrupting Rating: AC: 100,000 am peres rms

symmetrical;

DC: 10,000 amperes

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): KLKD 30

Use FLM 250 volt time-delay fuses to protect

control circuit trans form ers, solenoids, and other

circuits with high in-rush currents. Excellent for

supple men tal protection of small motors. For motor

branch circuit protection, Refer to Class CC fuses.

Voltage Rating: 125 Volts AC

125 Volts DC self-certified @ 10KA

Interrupting Rating: AC: 10,000 amperes rms

symmetrical.

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): FLM 15

KLK Fuses

Fast-Acting • 600 VAC

KLKD Fuses

Fast-Acting • 600 VAC/DC

FLM Fuses

Time-Delay • 250 VAC

Recommended Fuse Blocks

L60030M and LPSM series. Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

Catalog 49-62.indd 50 5/30/07 6:27:14 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Midget Fuses

Supplementary Overcurrent Protection

Ampere Ratings:

1⁄10 8⁄10 32⁄10 9

1⁄813

1⁄210

15 ⁄100 11⁄8412

3⁄16 11⁄441⁄214

2⁄10 11⁄2515

1⁄416⁄10 56⁄10 20

3⁄10 2625

4⁄10 21⁄461⁄430

1⁄221⁄27

6⁄10 38

Approvals: Standard 248-14

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

Recommended Fuse Blocks

L60030M and LPSM series. Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

These 500 volt time-delay fuses provide excellent

sup ple men tal protection of control power

transformers, solenoids, and circuits with high

inrush currents. UL and CSA 500 volt ratings

permit use on 480 volt circuits. FLQ fuses also

provide supplemental protection to small motors.

For motor branch circuit protection, refer to Class

CC fuses.

Voltage Rating: 500 Volts AC

300 Volts DC self-certified @ 10KA

Interrupting Rating: 10,000 amperes rms

symmetrical

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): FLQ 1⁄2

Fiber tube, 250 volt BLN fuses provide low-cost

protection for military ap pli ca tions and control

circuits.

Voltage Rating: 250 Volts AC

Interrupting Rating: 10,000 amperes rms

symmetrical

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): BLN 30

Ampere Ratings:

1481530

251020

361225

Approvals: Standard 248-14

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

Versions available to meet MIL-F-15160/9,

QPL F09A: Contact Factory

Laminated tube BLF fuses are the lowest price

midget fuse. They are suitable for control circuit

and in stru ment protection in dry locations.

Voltage Ratings: 250 Volts AC: 1⁄2 – 15 amperes;

125 Volts AC: 20 – 30 amperes

Interrupting Rating: 10,000 amperes rms

symmetrical

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): BLF 5

Ampere Ratings:

1⁄23715

14820

11⁄25925

261030

21⁄261⁄412

Approvals: Standard 248-14

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

FLQ Fuses

Time-Delay • 500 VAC

BLF Fuses

Fast-Acting • 125/250 VAC

BLN Fuses

Fast-Acting • 250 VAC

Catalog 49-62.indd 51 5/30/07 6:27:20 PM

Midget & Electronic Fuses

52 www.littelfuse.com

Midget & Electronic Fuses

BLS fuses are 13⁄8" long in contrast to other midget

fuses which are 11/

2". They provide space saving,

low cost protection to street lighting, metering,

control and electronic circuits.

Voltage Rating: 600 Volts AC: 2⁄10 – 5 amperes;

250 Volts AC: 6 – 10 amperes

Interrupting Rating: 10,000 amperes rms

symmetrical

Dimen sions: 13 ⁄32" x 13⁄8"

Example part number (series & amperage): BLS 10

Ampere Ratings:

2⁄10 138

4⁄10 11⁄2410

1⁄216⁄10 5

3⁄418⁄10 6

8⁄10 27

Approvals: Standard 248-14

UL Listed

2⁄10 -10 Amps (File No: E10480)

CSA Certified

1⁄2 – 5 Amps

(File No: LR29862)

FLA fuses are 125 volt, pin-indicating time-delay

fuses for protection of control circuit transformers,

so le noids, and other circuits with high in-rush

currents. Metal indicating pin pops-out when fuse

opens, giving visual indication of blown fuse. Use

FLA fuses in con junc tion with special fuseblocks

to operate me chan i cal signal switches or energize

alarm circuits. Fuses rated 12 amperes and above

have dual-tube construction.

Voltage Rating: 125 Volts AC

Interrupting Rating: 10,000 amperes rms

symmetrical

Dimensions: 13 ⁄32" x 11⁄2"

Example part number (series & amperage): FLA 15

* Note: Dual tube construction

Ampere Ratings:

1⁄10 11⁄838

15 ⁄100 11⁄432⁄10 10

2⁄10 14⁄10 31⁄2 12*

1⁄411⁄24 15

3⁄10 16⁄10 41⁄2 20*

4⁄10 18⁄10 5 25

1⁄225

6⁄10 30*

6⁄10 21⁄46

8⁄10 21⁄261⁄4

8⁄10 7

Approvals: Standard 248-14

UL Listed (File No: E10480)

CSA Certification Pending

Midget Fuses

Supplementary Overcurrent Protection

BLS Fuses

Fast-Acting • 250/600 VAC

FLA Fuses

Time-Delay • 125 VAC

Recommended Fuse Blocks

L60030M and LPSM series. Refer to the Blocks & Holders section of this catalog for additional in for ma tion.

Catalog 49-62.indd 52 5/30/07 6:27:28 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Midget Fuses

Supplementary Overcurrent Protection

The Littelfuse KLQ series is designed to protect

gaseous vapor fixtures, HID ballasts, and other

electronic and lighting circuits. The KLQ is the

same physical size as the Littelfuse BLS, but has

more time-delay to handle transient and in-rush

currents.

Voltage Rating: 600 VAC

Interrupting Rating: 10,000 amperes

Approvals: Standard 248-14 UL Listed

(File No: E10480)

Dimensions: 13 ⁄32" x 13⁄8"

The Littelfuse FLU series is designed specifically

for the protection of multimeters. The 1000 VAC/

VDC rating also makes the FLU ideal for a variety

of other applications.

Voltage Rating: 1000 VAC/VDC

Interrupting Rating: 44⁄100 A: 10kA

11A: 20k A

Ampere Range: FLU 44⁄100 =1A and FLU 11 = 15A

Approvals: UL Recognized under the

components program.

(File No: E10480)

CSA Certified (File No: LR29862)

Dimensions: 44⁄100A: 13 ⁄32" x 13⁄8"

11A:

13 ⁄32" x 11⁄2"

Also known as a “neutral”, the LNNB is actually

not a fuse. It is the same physical size as a

standard Midget fuse. The LNNB001 is a hollow

body design for use with standard fuse clips. The

LNNB002 is a solid body design for use with LEB/

LEX series inline style fuse holders.

Ampere Ratings:

125

16⁄10 36

Recommended Fuse Blocks:

L60030M Series. Refer to the Blocks & Holders section

of this catalog for additional information.

Ordering Information:

Example catalog number: KLQ005

Example system number: 0KLQ005.T

Ordering Information

Example catalog number: FLU011

Example system number: 0FLU011.T

Specifications

Dimensions: 13 ⁄32" x 11⁄2"

Ordering Information

Example catalog number: LNNB001

Example system number: LNNB0001Z

Example catalog number: LNNB002

Example system number: LNNB0002Z

KLQ Series Fuses

FLU Series Fuses

LNNB “Dummy” Fuse

LNNB002

LNNB001

Catalog 49-62.indd 53 5/30/07 6:27:34 PM

Midget & Electronic Fuses

54 www.littelfuse.com

Midget & Electronic Fuses

Midget Fuses

Supplementary Overcurrent Protection

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

1/8A

2/10A

1/4A

3/10A

1/2A

3/4A

1 1/2A

2 1/2A

3 1/2A

10A

12A

15A

20A

25A

30A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

1/10A

15/100A

1/4A

1/2A

1 1/2A

10A

15A

20A

25A

30A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

1/8A

2/10A

1/4A

3/10A

1/2A

3/4A

1 1/2A

2 1/2A

3 1/2A

10A

12A

15A

20A

25A

30A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

10 8A

10A

12A

14A

15A

20A

25A

30A

TIME IN SECONDS

CURRENT IN AMPERES

KLK KLKD

FLM FLQ

Catalog 49-62.indd 54 5/30/07 6:27:38 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Electronic Fuses

3AG/3AB Type

312/ 318 Series

3AG Fast Acting Fuse

Ampere Ratings:

1⁄100 2⁄10 12

1⁄212

1⁄32 1⁄411⁄4315

1⁄16 3⁄10 11⁄2420

1⁄10 3⁄816⁄10 525

1⁄81⁄213⁄4630

15 ⁄100 6⁄10 18⁄10 735

0.175 8⁄10 28

3⁄16 3⁄421⁄410

Approvals: Standard 248-14, UL Listed 1⁄100 -10 Amps

and UL Listed 12 – 30 Amps per Standard UL 275. CSA

Certified through 30 Amps.

Ampere Ratings:

1⁄83⁄44820

1⁄4151025

3⁄8261230

1⁄23715

Approvals: Standard 248-14, UL Listed and CSA

Certified 1⁄8 – 15 Amps. UL Recognized under the

Components Program and CSA Recognized under

the Component Acceptance Program 20 – 30 Amps.

Approved by MITI from 10 – 30 Amps.

Ampere Ratings:

1⁄100 15 ⁄100 3⁄88⁄10 18⁄10 32⁄10 10

1⁄32 0.175 4⁄10 12412

4⁄100 3⁄16 1⁄212⁄10 21⁄4515

1⁄16 2⁄10 6⁄10 11⁄421⁄261⁄420

1⁄10 1⁄47⁄10 11⁄228⁄10 725

1⁄83⁄10 3⁄416⁄10 3830

Approvals: Standard 248-14, UL Listed and CSA Certified

1⁄100 -8 Amps. UL Recognized under the Components Program

and CSA Recognized under the Component Acceptance

Program 10 – 30 Amps. MITI approved 1 – 5 Amps.

Ampere Ratings:

1⁄100 3⁄16 6⁄10 11⁄2415

1⁄32 2⁄10 7⁄10 16⁄10 520

1⁄16 1⁄43⁄426

1⁄425

1⁄10 3⁄10 8⁄10 21⁄2730

1⁄83⁄812

8⁄10 8

15 ⁄100 4⁄10 12⁄10 310

0.175 1⁄211⁄432⁄10 12

Approvals: Standard 248-14, UL Listed 1⁄4 – 10 Amps.

UL Recognized under the Components Program 12-30

Amps. CSA Certified 1⁄4 – 30 Amps.

Designed for fast acting protection of electronic

equipment and ap pli anc es. The “standard” fast

acting, glass tube fuse.

Voltage Rating: 250V: 1⁄100 – 10A.

32V: 12 – 35A.

Dimensions: 1⁄4" x 11⁄4" (6.4 x 31.8mm)

Order 312 series without leads.

Example part number (series & amperage): 312.375

Note: For fuses with axial leads, request 318 series.

To order a 3AG “Dummy” fuse request part number

310033.

Similar to 312 series, but ceramic tube permits

additional ampere ratings: 250 volt ratings through

30 amps.

Voltage Rating: 250V:

1⁄8 – 30A

Dimensions: 1⁄4" x 11⁄4" (6.4 x 31.8mm)

Order 314 series without leads.

Example part number (series & amperage): 324.375

Note: For fuses with axial leads, request 324 series.

313 and 315 series fuses have time-delay in the

overload range, which provides superior protection

for inductive loads such as motors, transformers,

and solenoids.

Voltage Rating: 250V: 1⁄100 – 8A. 32V: 10 – 30A.

Dimensions: 1⁄4" x 11⁄4" (6.4 x 31.8mm)

Order 313 series without leads.

Example part number (series & amperage): 313.500

Note: For fuses with axial leads, request 315 series.

To order a 3AG “Dummy” fuse request part number

310033.

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 Rating: 250V: 1⁄100 – 20A.

125V: 25 – 30A.

Dimensions: 1⁄4" x 11⁄4" (6.4 x 31.8mm)

Order 326 series without leads.

Example part number (series & amperage): 326012

Note: For fuses with axial leads, request 325 series.

326/ 325 Series

3AB SLO-BLO® Fuse

313/ 315 Series

3AG SLO-BLO® Fuse

314/ 324 Series

3AB Fast Acting Fuse

Catalog 49-62.indd 55 5/30/07 6:27:39 PM

Midget & Electronic Fuses

56 www.littelfuse.com

Midget & Electronic Fuses

Time-delay protection of electronic equipment and

ap pli anc es when fuses to In ter na tion al Standards

are required. Replacement fuses for foreign

equipment.

Voltage Rating: 250V AC

Design Standards: Meets IEC 60127-2, Sheet 5

Specification for Time Lag fuses.

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 215.315

Note: For fuses with axial leads add “XE” extension to

the part number. Example 215.630XE

Ampere Ratings:

.200 .400 .800 1.6 3.15 6.3

.250.5001248*

.315 .630 1.25 2.5 5 10*

*Available but not included in International Standards.

Interrupting Capacity: 1500A

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program. SEMKO, VDE, and BSI approved

1 – 6.3 Amps. MITI approved 1 – 10 Amps.

Electronic Fuses

Indicating Types

229/ 230 Series

2AG SLO-BLO® Indicating Fuse

313 Series

3AG SLO-BLO® Indicating Fuse

2AG indicating fuses instantly identify

them selves

upon opening by showing a dis col or a tion of their

glass bod ies. Guesswork and time con sum ing cir-

cuit testing is elim i nat ed. This unique design offers

the same quality per for mance char ac ter is tics as

the standard 2AG fuse design.

Voltage Rating: 250V: 1⁄4 – 31⁄2A; 125V: 4 – 7A

Dimensions: .177" x .57" (4.5 x 14.5mm)

For fuses with axial leads, request 230___S series.

Order 229___S series without leads.

Example part number (series & amperage): 22902.5S

3AG indicating fuses instantly identify

themselves

upon opening by showing a discoloration of their

glass bodies. Guesswork and time consuming cir-

cuit testing is eliminated. This unique design offers

the same quality per for mance char ac ter is tics as

the standard 3AG fuse design.

Voltage Rating: 250V:

1⁄2 – 8A; 32V: 10A.

Dimensions: 1⁄4" x 11⁄4": (6.4 x 31.8mm)

Example part number (series plus amperage, followed

by “ID”): 313007ID

Ampere Ratings:

1⁄211⁄235710

1246

1⁄48

Approvals: Standard 248-14, UL Listed and CSA

Certified 1⁄2 – 8 Amps. The 10 Amp is UL Recognized

under the Components Program and CSA Recognized

under the Component Acceptance Program.

Ampere Ratings:

1⁄43⁄424

.350 8⁄10 21⁄45

3⁄812

1⁄26

1⁄211⁄437

6⁄10 11⁄231⁄2

Approvals: Standard 248-14, UL Listed and CSA

Certified 1⁄4 – 31⁄2 Amps. UL Recognized under the

Components Program and CSA Recognized under the

Component Acceptance Program 4 – 7 Amps.

215 Series (Type T)

5 x 20mm SLO-BLO® Fuse

Catalog 49-62.indd 56 5/30/07 6:27:48 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Electronic Fuses

5 x 20mm IEC Type

217 Series (Type F)

5 x 20mm Fast-Acting Fuse

216 Series (Type F)

5 x 20mm Fast-Acting Fuse

218 Series (Type T)

5 x 20mm SLO-BLO® Fuse

Fast acting protection of electronic equipment and

appliances when fuses to In ter na tion al Standards are

required. Re place ment fuse for foreign equip ment.

Voltage Rating: 250V AC

Design Standards: Meets IEC 60127-2, Sheet 1

Specification for Fast-Acting Fuses.

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 216.200

Note: For fuses with axial leads add “XE” extension to

the part number. Example 216.630XE

Fast-acting protection of electronic equipment and

appliances when fuses to In ter na tion al Standards are

required. Re place ment fuse for foreign equip ment.

Voltage Rating: 250V AC

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 217.050

Design Standards: Meets IEC 60127-2, Sheet 2

Specification for Fast Acting Fuses.

Note: For fuses with axial leads add “XE” extension to

the part number. Example 217.630XE

Time-delay protection of electronic equipment and

appliances when fuses to In ter na tion al Standards

are required. Re place ment fuses for foreign

equipment.

Voltage Rating: 250V AC

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 218.630

Design Standards: Meets IEC 60127-2, Sheet 3

Specification for Time Lag Fuses.

Note: For fuses with axial leads add “XE” extension to

the part number. Example 218.630XE

Ampere Ratings:

.050 .125 .315 .800 2 5

.063 .160 .400 1 2.5 6.3

.080 .200 .500 1.25 3.15 8*

.100 .250 .630 1.6 4 10*

*Available but not included in International Standards.

Interrupting Capacity: 1500A

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program. SEMKO and VDE approved

through 6.3 Amps. BSI approved 1 – 6.3 Amps.

Ampere Ratings:

.032 .080 .200 .500 1.25 3.15 8*

.040 .100 .250 .630 1.6 4 10*

.050 .125 .315 .800 2 5 15*

.063 .160 .400 1 2.5 6.3

*Available but not included in International Standards.

Interrupting Capacity: 35A or 10x rated current, which-

ever is greater.

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program. SEMKO and VDE approved

through 6.3 Amps. BSI approved 0.4 – 6.3 Amps.

Ampere Ratings:

.032 .080 .200 .500 1.25 3.15 8*

.040 .100 .250 .630 1.6 4 10*

.050 .125 .315 .800 2 5 15*

.063 .160 .400 1 2.5 6.3

*Available but not included in International Standards.

Interrupting Capacity: 35A or 10x rated current, which-

ever is greater.

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program. SEMKO and VDE approved

through 6.3 Amps. BSI approved 0.8 – 6.3 Amps.

Catalog 49-62.indd 57 5/30/07 6:27:59 PM

Midget & Electronic Fuses

58 www.littelfuse.com

Midget & Electronic Fuses

Electronic Fuses

5 x 20mm and 2AG Type

5 x 20mm fuses designed to UL and CSA

standards. Fast Acting pro tec tion of electronic

equipment appliances.

Voltage Rating: 250V:

1⁄10 – 3A; 125V: 4 – 6A.

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 235.600

Note: For fuses with axial leads add “XE” extension to

the part number. Example 235.600XE

5 x 20mm fuses de signed to UL and CSA

standards. For protection of electronic equip ment

and appliances.

Voltage Rating: 250V:

2⁄10 – 3A. 125V: 4A.

Dimensions: 5mm x 20mm (.2 x .79 in.)

Example part number (series & amperage): 239.400

Note: For fuses with axial leads add “XE” extension to

the part number. Example 239.600XE

Fast acting performance of the 312, 3AG fuses

in less than one-third the space. For protection of

electronic equipment and ap pli anc es.

Voltage Rating: 250V:

1⁄10 – 31⁄2A. 125V: 4 – 10A

Dimensions: 2AG Fuse .177" x .57" (4.5 x 14.5mm)

Example part number (series & amperage): 224.500

Note: For fuses with axial leads, request series number

224. Order 225 series without leads.

229 series 2AG fuses have time-delay of 313

series 3AG fuses in less than one-third the space.

They provide superior protection for inductive

loads such as motors, trans form ers, and solenoids.

Use whenever time-delay fuses are indicated.

Voltage Rating: 250V:

1⁄4 – 31⁄2A; 125V: 4 – 7A.

Dimensions: 2AG Fuse .177" x .57" (4.5 x 14.5mm)

Example part number (series & amperage): 229.375

Note: For fuses with axial leads, request series number

230. Order 229 series without leads.

Ampere Ratings:

1⁄10 3⁄10 7⁄10 16⁄10 4

1⁄84⁄10 8⁄10 25

2⁄10 1⁄212

1⁄26

1⁄46⁄10 11⁄43

Approvals: Standard 248-14, UL Listed and CSA

Certified. MITI approved 1 – 5 Amps.

Ampere Ratings:

2⁄10 4⁄10 7⁄10 124

1⁄41⁄23⁄411⁄421⁄25

3⁄10 6⁄10 8⁄10 16⁄10 3

Approvals: Standard 248–14, UL Listed and CSA

Certified. MITI approved 1 – 5 Amps.

Ampere Ratings:

1⁄10 3⁄812

1⁄247

1⁄81⁄211⁄2358

1⁄43⁄423

1⁄2610

Approvals: Standard 248–14, UL Listed and CSA

Certified. 224 series approved by MITI 1 – 5 Amps.

Ampere Ratings:

1⁄46⁄10 11⁄221⁄246

3⁄83⁄42357

1⁄212

1⁄431⁄2

Approvals: Standard 248-14, UL Listed and

CSA Certified 1⁄4 – 31⁄2 Amps. UL Recognized under the

Components Program and CSA Recognized under the

Component Acceptance Program 4 – 7 Amps.

229/ 230 Series

2AG SLO-BLO® fuse

225/ 224 Series

2AG Fast-Acting fuse

239 Series

5 x 20mm SLO-BLO® fuse

235 Series

5 x 20mm Fast-Acting fuse

Catalog 49-62.indd 58 5/30/07 6:28:03 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Electronic Fuses

Subminiature Type

.235" .29" .17"

.10"

.25" .35" .17"

.10"

1.47" 1.47".28"

.095"

DIA.

LF 1A

EPOXY COATING

Fast acting Microfuses for pro tec tion of printed circuit

boards and similar equipment.

Voltage Rating: 125V AC

Example part number (series & amperage): 27201.5

Note: 278 series has 1" leads

Ampere Ratings:

1⁄500 1⁄32 1⁄84⁄10 3⁄42

1⁄200 1⁄20 2⁄10 1⁄28⁄10 3

1⁄100 1⁄16 1⁄46⁄10 14

1⁄64 1⁄10 3⁄10 7⁄10 11⁄25

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program.

For data on 262 and 268 series High Reliability (Hi-Rel)

microfuses, request Electronic Catalog.

Similar to 272 and 278 series, except has trans parent

cap for visual indication of fuse status.

Voltage Rating: 125V AC

Example part number (series & amperage): 273002

Note: 279 series has 1" leads

Ampere Ratings:

1⁄500 1⁄32 1⁄84⁄10 3⁄42

1⁄200 1⁄20 2⁄10 1⁄28⁄10 3

1⁄100 1⁄16 1⁄46⁄10 14

1⁄64 1⁄10 3⁄10 7⁄10 11⁄25

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program.

Subminiature fuse for soldered mounting on

printed circuit boards. Available on tape and reel

for automatic insertion.

Voltage Rating: 125V: 1⁄16 – 10A; 32V: 12 – 15A.

Example part number (series & amperage): 251.125

Ampere Ratings:

1⁄16 3⁄812

1⁄2410

1⁄81⁄211⁄23512

1⁄43⁄423

1⁄2715

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program.

Order 252 series for radial leads. To order PICO II fuses

with ampere ratings color-coded, order 255 series for

axial leads and 256 for radial leads.

For data on 265 and 266 series High Reliability (Hi-Rel)

Picofuses, request Electronic Catalog. For information

on PICO II 250V fast-acting fuses, contact factory.

Subminiature time-delay fuse for soldered

mounting on printed circuit boards. Available on

tape and reel for automatic in ser tion. Request

bulletin PB-1027 for further information.

Voltage Rating: 125V AC

Example part number (series & amperage): 473005

Ampere Ratings:

3⁄83⁄411⁄221⁄4347

1⁄2122

1⁄231⁄25

Approvals: UL Recognized under the Components

Program and CSA Recognized under the Component

Acceptance Program. MITI approved 1 – 5 Amp.

272/ 278 Series

Fast-Acting Microfuse

273/ 279 Series

Fast-Acting Microfuse

251/ 252 Series

Fast-Acting Pico®II Fuse

473 Series

SLO-BLO® Pico®II Fuse

1.47" 1.47".28"

.095"

DIA.

LF 1A

EPOXY COATING

Catalog 49-62.indd 59 5/30/07 6:28:10 PM

Midget & Electronic Fuses

60 www.littelfuse.com

Midget & Electronic Fuses

Automotive Fuses

SFE and Blade Type

Low voltage fuse for automotive and electronic

ap pli ca tions.

Voltage Rating: 32V AC/DC

Approvals: UL Listed under UL Standard #275.

Society of Automotive Engineers (SAE) J554.

Example part number (series & amperage): SFE006

Ampere Ratings/Dimensions:

The 257 series ATO fuse is a low voltage blade

type fuse for au to mo tive and elec tron ic ap pli-

ca tions. Designed, originated and patented by

Littelfuse, it has become the standard for OEM

circuit pro tec tion on foreign and do mes tic autos

and trucks. They are color-coded and readily iden-

ti fi able and may be specified for a variety of low

voltage applications.

Voltage Rating: 32V AC/DC

Example part number (series & amperage): ATO015

Approvals: UL Listed. CSA Certified 3 – 30 A.

Catalog No. Amp. Rating Volt. Rating Color Code

ATO 001 1 32 Black

ATO 002 2 32 Grey

ATO 003 3 32 Violet

ATO 004 4 32 Pink

ATO 005 5 32 Tan

ATO 07.5 71⁄232 Brown

ATO 010 10 32 Red

ATO 015 15 32 Blue

ATO 020 20 32 Yellow

ATO 025 25 32 Natural

ATO 030 30 32 Green

ATO 040 40 32 Orange

The MINI fuse is smaller than its predecessor,

the ATO fuse, which permits using more fuses

in the same amount of space. More fuses in the

same space satisfies the requirement that more

circuits be individually fused in newer au to mobiles.

Patented by Littelfuse.

Voltage Rating: 32V AC/DC

Example part number (series & amperage): MIN025

Approvals: UL Listed.

Note: For low-profile MINI® fuse, request 897 series

The patented MAXI Fuse is available in a higher

range of amperage ratings (20 – 80 amperes) than

the ATO or MINI fuses, and is physically larger

in size. It is color-coded for easy identification. A

typical MAXI Fuse application, in today’s more

sophisticated automobile circuits, is protection of

the wiring harness by replacing the fusible wire

or fusible link which is often a plain piece of small

wire.

Voltage Rating: 32V AC/DC

Example part number (series & amperage): MAX070

Approvals: UL Listed.

Ampere Rating Length Diameter

45⁄8"1⁄4"

63⁄4"1⁄4"

71⁄27⁄8"1⁄4"

97⁄8"1⁄4"

14 11⁄16"1⁄4"

20 11⁄4"1⁄4"

30 17⁄16"1⁄4"

MAX/ 299 Series

MAXI™ SLO-BLO® Fuse

MIN/ 297 Series

MINI® Fast-Acting Fuse

ATO® / 257 Series

Fast-Acting Fuse

SFE Series

Fast-Acting Fuse

Catalog No. Amp. Rating Volt. Rating Color Code

MAX 020 20 32 Yellow

MAX 030 30 32 Green

MAX 040 40 32 Orange

MAX 050 50 32 Red

MAX 060 60 32 Blue

MAX 070 70 32 Tan

MAX 080 80 32 Natural

Catalog No. Amp. Rating Volt. Rating Color Code

MIN 002 2 32 Grey

MIN 003 3 32 Violet

MIN 004 4 32 Pink

MIN 005 5 32 Tan

MIN 07.5 71⁄232 Brown

MIN 010 10 32 Red

MIN 015 15 32 Blue

MIN 020 20 32 Yellow

MIN 025 25 32 Natural

MIN 030 30 32 Green

Catalog 49-62.indd 60 5/30/07 6:28:19 PM

Midget & Electronic Fuses

www.littelfuse.com

Midget & Electronic Fuses

Automotive Fuses

Bolt-On Type

MEGA® SLO-BLO® Bolt-On Fuse

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.

MIDI® SLO-BLO® Bolt-On Fuse

The patented design of the Littelfuse MIDI fuse offers a bolt-on space

saving fuse with SLO-BLO characteristics for high current wiring

protection.

Specifications

Voltage Rating: 32V AC/DC

Interrupting Rating: 2000 A @ 32VDC

Example part number (series & amperage): MEG200

Recommended Fuse Holder

298900

Specifications

Voltage Rating: 32V AC/DC

Interrupting Rating: 1000 A @ 32VDC

Example part number (series & amperage): 498080

Recommended Fuse Holder

498900

Catalog No. Amp. Rating Volt. Rating Color Code

MEG100 100 32 Yellow

MEG125 125 32 Green

MEG150 150 32 Orange

MEG175 175 32 White

MEG200 200 32 Blue

MEG225 225 32 Tan

MEG250 250 32 Pink

Catalog No. Amp. Rating Volt. Rating Color Code

498030 30 32 Pink

498040 40 32 Green

498050 50 32 Red

498060 60 32 Yellow

498070 70 32 Brown

498080 80 32 White

498100 100 32 Blue

498125 125 32 Orange

498150 150 32 Grey

498200 200 32 Violet

Catalog 49-62.indd 61 5/30/07 6:28:30 PM

Midget & Electronic Fuses

62 www.littelfuse.com

Midget & Electronic Fuses

Automotive Fuses

Miscellaneous

CablePro® Cable Protector Fuse

The CablePro Fuse is a high performance alternative for providing a

reliable, safe, and cost effective fusible link. It provides similar circuit

protection as the MEGA® fuse in a slim package that fits into tight

locations. The standard CablePro features 1 one foot wire lead and 1

three foot wire lead. Contact the factory for custom wire lead lengths.

JCASE® SLO-BLO® Fuse

The patented JCASE is a cartridge style fuse with female terminals. It

was designed to provide increased time-delay to handle in-rush currents

and low voltage drop to protect high current automotive circuits.

Specifications

Voltage Rating: 32V AC/DC

Interrupting Rating: 1000 A @ 32VDC

Example part number (series & amperage): JCAS60

Specifications

Voltage Rating: 32V AC/DC

Interrupting Rating: 2000 A @ 32VDC

Example part number (series & amperage): 496060

Standard item: 1 foot cable on one side; 3 foot cable on the other side.

Catalog No. Amp. Rating Volt. Rating Wire Gauge

496060

10AWG

496080

8AWG

496100

100

8AWG

496125

125

6AWG

496150

150

4AWG

496175

175

4AWG

496200

200

4AWG

Catalog No. Amp. Rating Volt. Rating Color Code

JCAS20 20 32 Blue

JCAS30 30 32 Pink

JCAS40 40 32 Green

JCAS50 50 32 Red

JCAS60 60 32 Yellow

Catalog 49-62.indd 62 5/30/07 6:28:32 PM

www.littelfuse.com

Medium Voltage Fuses

Medium Voltage Fuses 64

R Rated Medium Voltage Fuses 65-68

E Rated Medium Voltage Fuses 69-73

E Rated Potential Transformer Fuses 74

Live Parts 75

Catalog 63-75.indd 63 5/30/07 6:34:47 PM

Medium Voltage Fuses

64 www.littelfuse.com

Medium Voltage Fuses

2,400 - 38,000 VAC • Current-Limiting

Littelfuse now offers a complete selection of “E” and “R” rated

medium voltage fuses for the protection of trans formers, 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 now available for virtually any application.

Hermetically sealed fuses for use in hazardous environments are also

offered.

Contact the factory or your local Littelfuse representative for additional

fuse ratings or custom mounting configurations.

24 Hour Emergency Service is available. Call 847 824 1188.

Applications

Power Transformer Protection

Potential Transformer Protection

Motor Controller Back-up Protection

Fused Switches

Feeder Circuits

General Information

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.

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.

Additional application data can be found in the Fuse Application section

of this catalog.

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” min; extension

force 2lb. min

Bolt-in Mount Fuses

Catalog 63-75.indd 64 5/30/07 6:34:50 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

Features

“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.

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.

Part Number System

130-4R-1C-5.5

R Rated Medium Voltage Fuses

Current-Limiting

3"DIA

Dim.A

Clip

Center

6.38"

Dim.B

9.75"

D DD DDD

Figure 1 Figure 2 Figure 3

Hookeye Feature*

* For hookeye attach-

ment; add “W” suffix

to part number

Max Voltage (KV)

Style (C-Cartridge)

No. of Barrels

Rating (size)

Continuous Current

Add “w” suffix to part number for hookeye attachment.

Characteristics

Voltage Rating: 2,400 volts – 8,250 volts

Current Range: 2R – 36R

Options

• Hermitically sealed for use in hazardous locations

(add “S” suffix to part number)

• Bolt-in mounting configurations

Rated

Catalog

Number

Old

Catalog

Number

Size

Maximum

Continuous Current

@ 40 deg C.

Dim. A

(inches)

Dim. B

(inches)

Min. Interrupting

Rating RMS Amps

Max Interrupting

Rating RMS Asym

Figure

Number

2.75 KV

70-2R-1C-2.75 LCK 2R 2R 70 7" 10.875" 170 80,000 1

100-3R-1C-2.75 LCK 3R 3R 100 7" 10.875" 250 80,000 1

130-4R-1C-2.75 LCK 4R 4R 130 7" 10.875" 340 80,000 1

150-5R-1C-2.75 LCK 5R 5R 150 7" 10.875" 390 80,000 1

170-6R-1C-2.75 LCK 6R 6R 170 7" 10.875" 500 80,000 1

200-9R-1C-2.75 LCK 9R 9R 200 7" 10.875" 760 80,000 1

230-12R-1C-2.75 LCK 12R 12R 230 7" 10.875" 1000 80,000 1

390-18R-2C-2.75 LCK 18R 18R 390 7" 10.875" 1500 80,000 2

450-24R-2C-2.75 LCK 24R 24R 450 7" 10.875" 1950 80,000 2

Catalog 63-75.indd 65 5/30/07 6:34:54 PM

Medium Voltage Fuses

66 www.littelfuse.com

Medium Voltage Fuses

R Rated Medium Voltage Fuses

Current-Limiting

3"DIA

Dim.A

(Clip

Center)

6.38"

Dim.B

9.75"

Rated

Catalog

Number

Old

Catalog

Number

Size

Maximum

Continuous Current

@ 40 Degrees C°

Dim. A

(inches)

Dim. B

(inches)

Min. Interrupting

Rating RMS Amps

Max Interrupting

Rating RMS (Asym)

Figure

Number

5.5 KV

70-2R-1C-5.5 LCL 2R 2R 70 12" 15.875" 170 80,000 4

100-3R-1C-5.5 LCL 3R 3R 100 12" 15.875" 250 80,000 4

130-4R-1C-5.5 LCL 4R 4R 130 12" 15.875" 340 80,000 4

150-5R-1C-5.5 LCL 5R 5R 150 12" 15.875" 390 80,000 4

170-6R-1C-5.5 LCL 6R 6R 170 12" 15.875" 500 80,000 4

200-9R-1C-5.5 LCL 9R 9R 200 12" 15.875" 760 80,000 4

230-12R-1C-5.5 LCL 12R 12R 230 12" 15.875" 1000 80,000 4

390-18R-2C-5.5 LCL 18R 18R 390 12" 15.875" 1500 80,000 5

450-24R-2C-5.5 LCL 24R 24R 450 12" 15.875" 1950 80,000 5

480-26R-2C-5.5 — 26R 480 12" 15.875" 2100 80,000 5

550-30R-2C-5.5 — 30R 550 12" 15.875" 2400 80,000 5

600-32R-2C-5.5 — 32R 600 12" 15.875" 2600 80,000 5

650-36R-2C-5.5 — 36R 650 12" 15.875" 2900 80,000 5

550-30R-3C-5.5 — 30R 550 12" 15.875" 2400 80,000 6

600-32R-3C-5.5 — 32R 600 12" 15.875" 2600 80,000 6

650-36R-3C-5.5 LCL 36R 36R 650 12" 15.875" 2900 80,000 6

5.5 KV

14”Clip Centers

70-2R-1C-5.5X —2R 70 14" 17.875" 170 80,000 4

100-3R-1C-5.5X —3R 100 14" 17.875" 250 80,000 4

130-4R-1C-5.5X —4R 130 14" 17.875" 340 80,000 4

150-5R-1C-5.5X —5R 150 14" 17.875" 390 80,000 4

170-6R-1C-5.5X —6R 170 14" 17.875" 500 80,000 4

200-9R-1C-5.5X —9R 200 14" 17.875" 760 80,000 4

230-12R-1C-5.5X —12R 230 14" 17.875" 1000 80,000 4

390-18R-2C-5.5X —18R 390 14" 17.875" 1500 80,000 5

450-24R-2C-5.5X —24R 450 14" 17.875" 1950 80,000 5

550-30R-2C-5.5X —30R 550 14” 17.875” 2400 80,000 5

Rated

Catalog

Number

Old

Catalog

Number

Size

Maximum

Continuous Current

@ 40 Degrees C°

Dim. A

(inches)

Dim. B

(inches)

Min. Interrupting

Rating RMS Amps

Max Interrupting

Rating RMS (Asym)

Figure

Number

8.25 KV

70-2R-1C-8.25 — 2R 70 12" 15.875" 190 80,000 4

100-3R-1C-8.25 — 3R 100 12" 15.875" 225 80,000 4

130-4R-1C-8.25 — 4R 130 12" 15.875" 330 80,000 4

150-5R-1C-8.25 — 5R 150 12" 15.875" 440 80,000 4

170-6R-1C-8.25 — 6R 170 12" 15.875" 500 80,000 4

200-9R-1C-8.25 — 9R 200 12" 15.875" 740 80,000 4

230-12R-1C-8.25 — 12R 230 12" 15.875" 955 80,000 4

390-18R-2C-8.25 — 18R 390 12" 15.875" 1440 80,000 5

450-24R-2C-8.25 — 24R 450 12" 15.875" 1910 80,000 5

Add “w” suffix to part number for hookeye attachment.

Figure 4 Figure 5 Figure 6

Catalog 63-75.indd 66 5/30/07 6:34:56 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

R Rated Medium Voltage Fuses

Current-Limiting

Rated

Catalog

Number

Old

Catalog

Number

Size

Maximum

Continuous Current

@ Degrees C°

Dim. A

(inches)

Dim. B

(inches)

Min. Interrupting

Rating RMS Amps

Max Interrupting

Rating RMS (Asym)

Figure

Number

2.75 KV

Bolt Mount “B”

70-2R-1B-2.75 —2R 70 4.6" 13" 170 80,000 7

00-3R-1B-2.75 —3R 100 4.6" 13" 250 80,000 7

30-4R-1B-2.75 —4R 130 4.6" 13" 240 80,000 7

150-5R-1B-2.75 —5R 150 4.6" 13" 390 80,000 7

170-6R-1B-2.75 —6R 170 4.6" 13" 500 80,000 7

200-9R-1B-2.75 —9R 200 4.6" 13" 760 80,000 7

230-12R-1B-2.75 —12R 230 4.6" 13" 1000 80,000 7

390-18R-2B-2.75 —18R 390 7.4" 13" 1500 80,000 8

450-24R-2B-2.75 —24R 450 7.4" 13" 1950 80,000 8

2.75 KV

Inverted Bolt “IB”

70-2R-1IB-2.75 —2R 70 — 13" 170 80,000 9

100-3R-1IB-2.75 —3R 100 — 13" 250 80,000 9

130-4R-1IB-2.75 —4R 130 — 13" 340 80,000 9

150-5R-1IB-2.75 —5R 150 — 13" 390 80,000 9

170-6R-1IB-2.75 —6R 170 — 13" 500 80,000 9

200-9R-1IB-2.75 —9R 200 — 13" 760 80,000 9

230-12R-1IB-2.75 —12R 230 — 13" 1000 80,000 9

390-18R-2IB-2.75 —18R 390 — 13" 1500 80,000 10

450-24R-2IB-2.75 —24R 450 — 13" 1950 80,000 10

Dim.B

Dim.ADim.A

(2) .34" X .660 Slots

1.38" Apart

3" Dia.

(2) .34" Holes

1.38" Apart

Indicator

Dim.BDim.B

3" Dia. Indicator

Indicator

Bolt Mount “B” Inverted-Bolt “IB”

Figure 7 Figure 8 Figure 9 Figure 10

Littelfuse POWR-GARD™ medium voltage fuses are available in

several bolt-in mounting configurations. Contact factory for custom

configurations.

“B” Bolt mount

“BI” Bolt-In mount

“IB” Inverted-Bolt mount

Refer to illustrations for mounting dimensions.

Catalog 63-75.indd 67 5/30/07 6:34:58 PM

Medium Voltage Fuses

68 www.littelfuse.com

Medium Voltage Fuses

R Rated Medium Voltage Fuses

Current-Limiting

Rated

Catalog

Number

Old

Catalog

Number

Size

Maximum

Continuous Current

@ 40˚ C.

Dim. A

(inches)

Dim. B

(inches)

Min. Interrupting

Rating RMS Amps

Max Interrupting

Rating RMS (Asym)

Figure

Number

5.5 KV

Bolt In Mount “BI”

70-2R-1BI-5.5 — 2R 70 3.6 ” 18" 170 80,000 11

100-3R-1BI-5.5 — 3R 100 3.6 ” 18" 250 80,000 11

130-4R-1BI-5.5 — 4R 130 3.6 ” 18" 340 80,000 11

150-5R-1BI-5.5 — 5R 150 3.6 ” 18" 390 80,000 11

170-6R-1BI-5.5 — 6R 170 3.6 ” 18" 500 80,000 11

200-9R-1BI-5.5 — 9R 200 3.6 ” 18" 760 80,000 11

230-12R-1BI-5.5 — 12R 230 3.6 ” 18" 1000 80,000 11

390-18R-2BI-5.5 — 18R 390 7.6” 18" 1500 80,000 12

450-24R-2BI-5.5 — 24R 450 7.6” 18" 1950 80,000 12

480-26R-2BI-5.5 — 26R 480 7.6” 18" 2200 80,000 12

550-30R-2BI-5.5 — 30R 550 7.6” 18" 2400 80,000 12

600-32R-2BI-5.5 — 32R 600 7.6” 18" 2650 80,000 12

650-36R-2BI-5.5 — 36R 650 7.6” 18" 2900 80,000 12

550-30R-3BI-5.5 — 30R 550 — 18" — 80,000 13

600-32R-3BI-5.5 — 32R 600 — 18" — 80,000 13

650-36R-3BI-5.5 — 36R 650 — 18" — 80,000 13

700-38R-3BI-5.5 — 38R 700 — 18" — 80,000 13

5.5 KV

Bolt Mount “B”

70-2R-1B-5.5 — 2R 70 4.6” 18" 170 80,000 7

100-3R-1B-5.5 — 3R 100 4.6” 18" 250 80,000 7

130-4R-1B-5.5 — 4R 130 4.6” 18" 340 80,000 7

150-5R-1B-5.5 — 5R 150 4.6” 18" 390 80,000 7

170-6R-1B-5.5 — 6R 170 4.6” 18" 500 80,000 7

200-9R-1B-5.5 — 9R 200 4.6” 18" 760 80,000 7

230-12R-1B-5.5 — 12R 230 4.6” 18" 1000 80,000 7

390-18R-2B-5.5 — 18R 390 7.4” 18" 1500 80,000 8

450-24R-2B-5.5 — 24R 450 7.4” 18" 1950 80,000 8

550-30R-2B-5.5 — 30R 550 8.4” 18" 2400 80,000 8

600-32R-2B-5.5 — 32R 600 8.4” 18" 2650 80,000 8

650-36R-2B-5.5 — 36R 650 8.4” 18" 2900 80,000 8

5.5 KV

Inverted Bolt “IB”

70-2R-1IB-5.5 — 2R 70 — 18" 170 80,000 9

100-3R-1IB-5.5 — 3R 100 — 18" 250 80,000 9

130-4R-1IB-5.5 — 4R 130 — 18" 340 80,000 9

150-5R-1IB-5.5 — 5R 150 — 18" 390 80,000 9

170-6R-1IB-5.5 — 6R 170 — 18" 500 80,000 9

200-9R-1IB-5.5 — 9R 200 — 18" 760 80,000 9

230-12R-1IB-5.5 — 12R 230 — 18" 1000 80,000 9

390-18R-2IB-5.5 — 18R 390 — 18" 1500 80,000 10

450-24R-2IB-5.5 — 24R 450 — 18" 1950 80,000 10

550-30R-2IB-5.5 — 30R 550 — 18" 2400 80,000 10

600-32R-2IB-5.5 — 32R 600 — 18" 2650 80,000 10

650-36R-2IB-5.5 — 36R 650 — 18" 2900 80,000 10

8.25 KV

Bolt-In Mount “BI”

70-2R-1BI-8.25 — 2R 70 3.6” 18" 190 80,000 11

100-3R-1BI-8.25 — 3R 100 3.6” 18" 225 80,000 11

130-4R-1BI-8.25 — 4R 130 3.6” 18" 330 80,000 11

150-5R-1BI-8.25 — 5R 150 3.6” 18" 400 80,000 11

170-6R-1BI-8.25 — 6R 170 3.6” 18" 500 80,000 11

200-9R-1BI-8.25 — 9R 200 3.6” 18" 740 80,000 11

230-12R-1BI-8.25 — 12R 230 3.6” 18" 955 80,000 11

390-18R-2BI-8.25 — 18R 390 7.6” 18" 1440 80,000 12

450-24R-2BI-8.25 — 24R 450 7.6” 18" 1910 80,000 12

Dim.B

Dim.A

Dim.B

Dim.A

3"Dia.

Front View

.44" X .91" Slots (1.53" c.t.c.) Indicator Indicator

Bolt-In Mount “BI”

Figure 11 Figure 12 Figure 13

Catalog 63-75.indd 68 5/30/07 6:35:00 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

E Rated Medium Voltage Fuses

Current-Limiting

“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.

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 220-

240% of the fuse’s continuous current rating. These values establish

one point on the time-current curve.

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.

3"DIA

Dim.A

(Clip

Center)

6.38"

Dim.B

9.75"

Figure 14 Figure 15 Figure 16

Characteristics

Voltage Rating: 2,400 volts – 38,000 volts

Current Range: 10E – 600E

Options

• Hermetically sealed for use in hazardous locations

(add “S” suffix to part number)

• Clip-lock (CL) and bolt-in styles available.

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym) Figure Number

2.75 Max. KV

10E-1C-2.75 LCX 10E 10E 7" 10.875" 80,000 14

15E-1C-2.75 — 15E 7" 10.875" 80,000 14

20E-1C-2.75 — 20E 7" 10.875" 80,000 14

25E-1C-2.75 — 25E 7" 10.875" 80,000 14

30E-1C-2.75 LCX 30E 30E 7" 10.875" 80,000 14

40E-1C-2.75 LCX 40E 40E 7" 10.875" 80,000 14

50E-1C-2.75 LCX 50E 50E 7" 10.875" 80,000 14

65E-1C-2.75 LCX 65E 65E 7" 10.875" 80,000 14

80E-1C-2.75 LCX 80E 80E 7" 10.875" 80,000 14

100E-1C-2.75 LCX 100E 100E 7" 10.875" 80,000 14

125E-1C-2.75 — 125E 7" 10.875" 80,000 14

150E-1C-2.75 — 150E 7" 10.875" 80,000 14

200E-1C-2.75 — 200E 7" 10.875" 80,000 14

125E-2C-2.75 LCX 125E 125E 7" 10.875" 80,000 15

150E-2C-2.75 LCX 150E 150E 7" 10.875" 80,000 15

175E-2C-2.75 LCX 175E 175E 7" 10.875" 80,000 15

200E-2C-2.75 LCX 200E 200E 7" 10.875" 80,000 15

225E-2C-2.75 — 225E 7" 10.875" 80,000 15

250E-2C-2.75 LCX 250E 250E 7" 10.875" 80,000 15

300E-2C-2.75 LCX 300E 300E 7" 10.875" 80,000 15

350E-2C-2.75 — 350E 7" 10.875" 80,000 15

400E-2C-2.75 LCX 400E 400E 7" 10.875" 80,000 15

450E-2C-2.75 — 450E 7" 10.875" 80,000 15

Catalog 63-75.indd 69 5/30/07 6:35:03 PM

Medium Voltage Fuses

70 www.littelfuse.com

Medium Voltage Fuses

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym) Diagram

5.5 Max. KV

10E-1C-5.5 — 10E 12" 15.875" 80,000 14

15E-1C-5.5 — 15E 12" 15.875" 80,000 14

20E-1C-5.5 — 20E 12" 15.875" 80,000 14

25E-1C-5.5 — 25E 12" 15.875" 80,000 14

30E-1C-5.5 LCY 30E 30E 12" 15.875" 80,000 14

40E-1C-5.5 LCY 40E 40E 12" 15.875" 80,000 14

50E-1C-5.5 LCY 50E 50E 12" 15.875" 80,000 14

65E-1C-5.5 LCY 60E 65E 12" 15.875" 80,000 14

80E-1C-5.5 LCY 80E 80E 12" 15.875" 80,000 14

100E-1C-5.5 LCY 100E 100E 12" 15.875" 80,000 14

125E-1C-5.5 LCY 125E 125E 12" 15.875" 80,000 14

150E-1C-5.5 LCY 150E 150E 12" 15.875" 80,000 14

175E-1C-5.5 LCY 175E 175E 12" 15.875" 80,000 14

200E-1C-5.5 LCY 200E 200E 12" 15.875" 80,000 14

125E-2C-5.5 — 125E 12" 15.875" 80,000 15

150E-2C-5.5 — 150E 12" 15.875" 80,000 15

175E-2C-5.5 — 175E 12" 15.875" 80,000 15

200E-2C-5.5 — 200E 12" 15.875" 80,000 15

250E-2C-5.5 LCY 250E 250E 12" 15.875" 80,000 15

300E-2C-5.5 LCY 300E 300E 12" 15.875" 80,000 15

350E-2C-5.5 LCY 350E 350E 12" 15.875" 80,000 15

400E-2C-5.5 LCY 400E 400E 12" 15.875" 80,000 15

450E-2C-5.5 LCY 450E 450E 12" 15.875" 80,000 15

500E-3C-5.5 — 500E 12" 15.875" 80,000 16

550E-3C-5.5 — 550E 12" 15.875" 80,000 16

600E-3C-5.5 — 600E 12" 15.875" 80,000 16

5.5 Max. KV

5NLE-10E — 10E 14” 177⁄8" 80,000 14

5NLE-15E — 15E 14” 177⁄8" 80,000 14

5NLE-20E — 20E 14” 177⁄8" 80,000 14

5NLE-25E — 25E 14” 177⁄8" 80,000 14

5NLE-30E LCU 30E 30E 14” 177⁄8" 80,000 14

5NLE-40E LCU 40E 40E 14” 177⁄8" 80,000 14

5NLE-50E LCU 50E 50E 14” 177⁄8" 80,000 14

5NLE-65E LCU 65E 65E 14” 177⁄8" 80,000 14

5NLE-80E LCU 80E 80E 14” 177⁄8" 80,000 14

5NLE-100E LCU 100E 100E 14” 17 7⁄8" 80,000 14

5NLE-125E LCU 125E 125E 14“ 17 7⁄8" 80,000 14

5NLE-150E LCU 150E 150E 14” 17 7⁄8" 80,000 14

5NLE-175E LCU 175E 175E 14” 17 7⁄8" 80,000 14

5NLE-200E LCU 200E 200E 14” 177⁄8" 80,000 14

5NLE2-225E — 225E 14” 177⁄8" 80,000 15

5NLE2-250E LCU 250E 250E 14” 177⁄8" 80,000 15

5NLE2-300E LCU 300E 300E 14” 177⁄8" 80,000 15

5NLE2-350E LCU 350E 350E 14” 177⁄8" 80,000 15

5NLE2-400E LCU 400E 400E 14” 177⁄8" 80,000 15

5NLE2-450E LCU 450E 450E 14” 177⁄8" 80,000 15

E Rated Medium Voltage Fuses

Current-Limiting

Catalog 63-75.indd 70 5/30/07 6:35:04 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym) Diagram

8.25 Max. KV

10E-1C-8.25 — 10E 12" 15 7⁄8" 80,000, 14

15E-1C-8.25 — 15E 12" 15 7⁄8" 80,000 14

20E-1C-8.25 — 20E 12" 157⁄8" 80,000 14

25E-1C-8.25 — 25E 12" 157⁄8" 80,000 14

30E-1C-8.25 LDZ 30E 30E 12" 157⁄8" 80,000 14

40E-1C-8.25 LDZ 40E 40E 12" 157⁄8" 80,000 14

50E-1C-8.25 LDZ 50E 50E 12" 157⁄8" 80,000 14

65E-1C-8.25 LDZ 65E 65E 12" 157⁄8" 80,000 14

80E-1C-8.25 LDZ 80E 80E 12" 157⁄8" 80,000 14

100E-1C-8.25 LDZ 100E 100E 12" 15 7⁄8" 80,000 14

125E-1C-8.25 LDZ 125E 125E 12" 157⁄8" 80,000 14

150E-1C-8.25 LDZ 150E 150E 12" 15 7⁄8" 80,000 14

125E-2C-8.25 LDZ 125E 125E 12" 15 7⁄8" 80,000 15

150E-2C-8.25 LDZ 150E 150E 12" 157⁄8" 80,000 15

200E-2C-8.25 LDZ 200E 200E 12" 157⁄8" 80,000 15

250E-2C-8.25 LDZ 250E 250E 12" 157⁄8" 80,000 15

300E-2C-8.25 LDZ 300E 300E 12" 157⁄8" 80,000 15

350E-3C-8.25 LDZ 350Z 350E 12" 157⁄8" 80,000 16

400E-3C-8.25 — 400E 12" 157⁄8" 80,000 16

8.25 Max. KV

8NLE-10E — 10E 14" 177⁄8" 80,000 14

8NLE-15E — 15E 14" 177⁄8" 80,000 14

8NLE-20E — 20E 14" 177⁄8" 80,000 14

8NLE-25E — 25E 14" 177⁄8" 80,000 14

8NLE-30E LCZ 30E 30E 14" 177⁄8" 80,000 14

8NLE-40E LCZ 40E 40E 14" 177⁄8" 80,000 14

8NLE-50E LCZ 50E 50E 14" 177⁄8" 80,000 14

8NLE-65E LCZ 65E 65E 14" 177⁄8" 80,000 14

8NLE-80E LCZ 80E 80E 14" 177⁄8" 80,000 14

8NLE-100E LCZ 100E 100E 14" 17 7⁄8" 80,000 14

8NLE2-100E LCZ 100E 100E 14" 17 7⁄8" 80,000 14

8NLE2-125E LCZ 125E 125E 14" 177⁄8" 80,000 15

8NLE2-150E LCZ 150E 150E 14" 17 7⁄8" 80,000 15

8NLE2-200E LCZ 200E 200E 14" 177⁄8" 80,000 15

8NLE2-250E — 250E 14" 177⁄8" 80,000 15

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

15.5 Max. KV

10E-1C-15.5 LDN 10E 10E 15" 18.875" 80,000 14

15E-1C-15.5 LDN 15E 15E 15" 18.875" 80,000 14

20E-1C-15.5 LDN 20E 20E 15" 18.875" 80,000 14

25E-1C-15.5 LDN 25E 25E 15" 18.875" 80,000 14

30E-1C-15.5 LDN 30E 30E 15" 18.875" 80,000 14

40E-1C-15.5 LDN 40E 40E 15" 18.875" 80,000 14

50E-1C-15.5 LDN 50E 50E 15" 18.875" 80,000 14

65E-1C-15.5 LDN 65E 65E 15" 18.875" 80,000 14

80E-1C-15.5 LDN 80E 80E 15" 18.875" 80,000 14

100E-1C-15.5 LDN 100E 100E 15" 18.875" 80,000 14

65E-2C-15.5 — 65E 15" 18.875" 80,000 15

80E-2C-15.5 — 80E 15" 18.875" 80,000 15

100E-2C-15.5 — 100E 15" 18.875" 80,000 15

125E-2C-15.5 — 125E 15" 18.875" 80,000 15

150E-2C-15.5 LDN 150E 150E 15" 18.875" 80,000 15

175E-2C-15.5 LDN 175E 175E 15" 18.875" 80,000 15

200E-2C-15.5 — 200E 15" 18.875" 80,000 15

200E-3C-15.5 — 200E 15" 18.875" 80,000 16

250E-3C-15.5 — 250E 15" 18.875" 80,000 16

300E-3C-15.5 — 300E 15" 18.875" 80,000 16

E Rated Medium Voltage Fuses

Current-Limiting

Catalog 63-75.indd 71 5/30/07 6:35:06 PM

Medium Voltage Fuses

72 www.littelfuse.com

Medium Voltage Fuses

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

15.5

Max. KV

15GSE-65E — 65E 18" 217⁄8" 60,000 14

15GSE-80E — 80E 18" 217⁄8" 60,000 14

15GSE-100E — 100E 18" 21 7⁄8" 60,000 14

15GSE2-125E — 125E 18" 21 7⁄8" 60,000 15

15GSE2-150E — 150E 18" 21 7⁄8" 60,000 15

15GSE2-175E — 175E 18" 21 7⁄8" 60,000 15

15GSE2-200E — 200E 18" 21 7⁄8" 60,000 15

15.5 Max. KV

15NLE-10E — 10E 20" 23 7⁄8" 60,000 14

15NLE-15E — 15E 20" 23 7⁄8" 60,000 14

15NLE-20E — 20E 20" 237⁄8" 60,000 14

15NLE-25E — 25E 20" 237⁄8" 60,000 14

15NLE-30E LCN 30E 30E 20" 237⁄8" 60,000 14

15NLE-40E LCN 40E 40E 20" 237⁄8" 60,000 14

15NLE-50E LCN 50E 50E 20" 237⁄8" 60,000 14

15NLE-65E LCN 65E 65E 20" 237⁄8" 60,000 14

15NLE-80E LCN 80ES 80E 20" 237⁄8" 60,000 14

15NLE-100E LCN 100ES 100E 20" 23 7⁄8" 60,000 14

15NLE2-80E LCN 80E 80E 20" 237⁄8" 60,000 15

15NLE2-100E LCN 100E 100E 20" 237⁄8" 60,000 15

15NLE2-125E LCN 125X 125E 20" 23 7⁄8" 60,000 15

15NLE2-150E LCN 150E 150E 20" 23 7⁄8" 60,000 15

15NLE2-175E — 175E 20" 23 7⁄8" 60,000 15

15NLE2-200E LCN 200ED 200E 20" 237⁄8" 60,000 15

15NLE3-150E — 150E 20" 23 7⁄8" 60,000 16

15NLE3-175E — 175E 20" 23 7⁄8" 60,000 16

15NLE3-25 0E — 250E 20" 23 7⁄8" 60,000 16

15NLE3-300E — 300E 20" 23 7⁄8" 60,000 16

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

25.8 Max. KV

15E-1C-25.8 — 15E 21" 24 5⁄8" 40,000 14

20E-1C-25.8 — 20E 21" 245⁄8" 40,000 14

25E-1C-25.8 — 25E 21" 245⁄8" 40,000 14

30E-1C-25.8 — 30E 21" 245⁄8" 40,000 14

40E-1C-25.8 — 40E 21" 245⁄8" 40,000 14

50E-1C-25.8 — 50E 21" 245⁄8" 40,000 14

65E-2C-25.8 — 65E 21" 245⁄8" 40,000 14

80E-2C-25.8 — 80E 21" 245⁄8" 40,000 15

100E-2C-25.8 — 100E 21" 24 5⁄8" 40,000 15

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

38 Max. KV

3E-1C-38.0 — 3E 27" 305⁄8" 20,000 14

7E-1C-38.0 — 7E 27" 305⁄8" 20,000 14

10E-1C-38.0 — 10E 27" 305⁄8" 20,000 14

15E-1C-38.0 — 15E 27" 30 5⁄8" 20,000 14

20E-1C-38.0 — 20E 27" 305⁄8" 20,000 14

25E-1C-38.0 — 25E 27" 305⁄8" 20,000 14

30E-1C-38.0 — 30E 27" 305⁄8" 20,000 14

40E-1C-38.0 — 40E 27" 305⁄8" 20,000 14

50E-2C-38.0 — 50E 27" 305⁄8" 20,000 15

65E-2C-38.0 — 65E 27" 305⁄8" 20,000 15

80E-2C-38.0 — 80E 27" 305⁄8" 20,000 15

E Rated Medium Voltage Fuses

Current-Limiting

Catalog 63-75.indd 72 5/30/07 6:35:08 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

5.5 Max. KV

Clip Lock

10E-1CL-5.5 — 10E 16.38" 15.13" 80,000 17

15E-1CL-5.5 — 15E 16.38" 15.13" 80,000 17

20E-1C-5.5 — 20E 16.38" 15.13" 80,000 17

25E-1CL-5.5 — 25E 16.38" 15.13" 80,000 17

30E-1CL-5.5 — 30E 16.38" 15.13" 80,000 17

40E-1CL-5.5 — 40E 16.38" 15.13" 80,000 17

50E-1CL-5.5 — 50E 16.38" 15.13" 80,000 17

65E-1CL-5.5 — 65E 16.38" 15.13" 80,000 17

80E-1CL-5.5 — 80E 16.38" 15.13" 80,000 17

100E-1CL-5.5 — 100E 16.38" 15.13" 80,000 17

125E-1CL-5.5 — 125E 16.38" 15.13" 80,000 17

150E-1CL-5.5 — 150E 16.38" 15.13" 80,000 17

225E-2CL-5.5 — 225E 17.38" 16.13" 80,000 18

250E-2CL-5.5 — 250E 17.38" 16.13" 80,000 18

300E-2CL-5.5 — 300E 17.38" 16.13" 80,000 18

350E-2CL-5.5 — 350E 17.38" 16.13" 80,000 18

400E-2CL-5.5 — 400E 17.38" 16.13" 80,000 18

450E-2CL-5.5 — 450E 17.38" 16.13" 80,000 18

500E-3CL-5.5 — 500E 17.38" 16.13" 80,000 19

550E-3CL-5.5 — 550E 17.38" 16.13" 80,000 19

600E-3CL-5.5 — 600E 17.38" 16.13" 80,000 19

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

8.25 Max. KV

Clip Lock

10E-1CL-8.25 — 10E 17.38" 16.13" 80,000 17

15E-1CL-8.25 — 15E 17.38" 16.13" 80,000 17

20E-1C-8.25 — 20E 17.38" 16.13" 80,000 17

25E-1CL-8.25 — 25E 17.38" 16.13" 80,000 17

30E-1CL-8.25 — 30E 17.38" 16.13" 80,000 17

40E-1CL-8.25 — 40E 17.38" 16.13" 80,000 17

50E-1CL-8.25 — 50E 17.38" 16.13" 80,000 17

65E-1CL-8.25 — 65E 17.38" 16.13" 80,000 17

80E-1CL-8.25 — 80E 17.38" 16.13" 80,000 17

100E-1CL-8.25 — 100E 17.38" 16.13" 80,000 17

125E-2CL-8.25 — 125E 17.38" 16.13" 80,000 18

150E-2CL-8.25 — 150E 17.38" 16.13" 80,000 18

175E-2CL-8.25 — 175E 17.38" 16.13" 80,000 18

200E-2CL-8.25 — 200E 17.38" 16.13" 80,000 18

225E-2CL-8.25 — 225E 17.38" 16.13" 80,000 18

250E-2CL-8.25 — 250E 17.38" 16.13" 80,000 18

300E-2CL-8.25 — 300E 17.38" 16.13" 80,000 18

350E-3CL-8.25 — 350E 17.38" 16.13" 80,000 19

Rated Catalog Number Old Catalog Number Size Dim. A (inches) Dim. B (inches) Max Interrupting

Rating RMS (Asym)

Figure

Number

15.5 Max. KV

Clip Lock

10E-1CL-15.5 — 10E 19.8" 18.1" 60,000 17

15E-1CL-15.5 — 15E 19.8" 18.1" 60,000 17

20E-1CL-15.5 — 20E 19.8" 18.1" 60,000 17

25E-1CL-15.5 — 25E 19.8" 18.1" 60,000 17

30E-1CL-15.5 — 30E 19.8" 18.1" 60,000 17

40E-1CL-15.5 — 40E 19.8" 18.1" 60,000 17

50E-1CL-15.5 — 50E 19.8" 18.1" 60,000 17

65E-1CL-15.5 — 65E 22.81" 21.13" 60,000 17

80E-1CL-15.5 — 80E 22.81" 21.13" 60,000 17

100E-1CL-15.5 — 100E 22.81" 21.13" 60,000 17

125E-2CL-15.5 — 125 22.81" 19.1" 60,000 18

150E-3CL-15.5—150E22.81" 19.1" 60,000 19

175E-3CL-15.5—175E22.81" 19.1" 60,000 19

200E-3CL-15.5 — 200E 22.81" 19.1" 60,000 19

225E-3CL-15.5—225E22.81" 19.1" 60,000 19

250E-3CL-15.5—250E22.81" 19.1" 60,000 19

300E-3CL-15.5 — 300E 22.81" 19.1" 60,000 19

E Rated Medium Voltage Fuses

Current-Limiting

4.75 7.94 11.56

1.25

.25

3.0

Clip Lock Design

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. Figure 17 Figure 18 Figure 19

Catalog 63-75.indd 73 5/30/07 6:35:10 PM

Medium Voltage Fuses

74 www.littelfuse.com

Medium Voltage Fuses

E Rated Potential Transformer Fuses

Current-Limiting

Potential Transformer (PT) fuses are current-limiting fuses with high

interrupting ratings designed for the protection of potential transformers.

Application Note:

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.

Characteristics

Voltage Rating: 600VAC – 25,500 VAC

Current Range: 1/2E – 10E

Rated Catalog Number Old Catalog Number Size Length Dim. A (inches) Diameter Dim. B (inches) Max Interrupting

Rating RMS (Sym)

600

Volt

3E-4PT-6 — 3E 4.6” 0.8125” 37,500

5E-4PT-6 — 5E 4.6” 0.8125” 37,500

7E-4PT-6 — 7E 4.6” 0.8125” 37,500

10E-4PT-6 — 10E 4.6” 0.8125” 37,500

2.75

Max.

500E-4PT-2.4 — 1/2E 4.6” 0.8125” 37,000

1E-4PT-2.4 LCD 1E-4 1E 4.6” 0.8125” 37,000

2E-4PT-2.4 LCD 2E-4 2E 4.6” 0.8125” 37,000

2.75

Max.KV

1E-6PT-2.75 — 1E 7.4” 1.5625” 37,500

2E-6PT-2.75 — 2E 7.4” 1.5625” 37,500

3E-6PT-2.75 — 3E 7.4” 1.5625” 37,500

1E-8PT-2.75 — 1E 9.5” 1.5625” 37,000

2E-8PT-2.75 — 2E 9.5” 1.5625” 37,000

3E-8PT-2.75 — 3E 9.5” 1.5625” 37,000

4.8

Max.

1E-5PT-4.8 LCE 1E-4 1E 5.6” 0.8125” 50,000

2E-5PT-4.8 LCE 2E-4 2E 5.6” 0.8125” 50,000

5.5

Max. kV

1/2E-6PT-5.5 — 1/2E 7.4” 1.5625” 50,000

1E-6PT-5.5 — 1E 7.4” 1.5625” 50,000

2E-6PT-5.5 — 2E 7.4” 1.5625” 50,000

3E-6PT-5.5 — 3E 7.4” 1.5625” 50,000

5E-6PT-5.5 — 5E 7.4” 1.5625” 50,000

1/2E-8PT-5.5 LCQ .5E 1/2E 9.5” 1.5625” 50,000

1E-8PT-5.5 LCQ 1E 1E 9.5” 1.5625” 50,000

2E-8PT-5.5 LCQ 2E 2E 9.5” 1.5625” 50,000

3E-8PT-5.5 LCQ 3E 3E 9.5” 1.5625” 50,000

5E-8PT-5.5 LCQ 5E 5E 9.5” 1.5625” 50,000

10E-8PT-5.5 LCQ 10E 10E 9.5” 1.5625” 50,000

8.25

Max.

1/2E-8PT-8.25 — 1/2E 9.5” 1.5625” 50,000

1E-8PT-8.25 — 1E 9.5” 1.5625” 50,000

2E-8PT-8.25 — 2E 9.5” 1.5625” 50,000

3E-8PT-8.25 — 3 9.5” 1.5625” 50,000

15.5

Max. kV

1/2E-11PT-15.5 LCT .5E 1/2E 12.8” 1.5625” 35,000

1E-11PT-15.5 LCT 1E 1E 12.8” 1.5625” 35,000

2E-11PT-15.5 LCT 2E 2E 12.8” 1.5625” 35,000

3E-11PT-15.5 LCT 3E 3E 12.8” 1.5625” 35,000

3E-16PT-15.5 — 3E 17.5” 1.5625” 35,000

5E-16PT-15.5 — 5E 17.5” 1.5625” 35,000

25.8

Max.

1/2E-16PT-25.5 LCJ 1E-4 1/2E 17.5” 1.5625” 43,500

1E-16PT-25.5 LCJ 2E-4 1E 17.5” 1.5625” 43,500

Catalog 63-75.indd 74 5/30/07 6:35:13 PM

Medium Voltage Fuses

www.littelfuse.com

Medium Voltage Fuses

Live Parts

TRIPLE BARREL

Bottom Lever In

Closed Position

.56 Dia. (2) Holes

For Mounting

Cable/Bus

.44 DIA. (2) HOLES

DOUBLE BARREL

SINGLE BARREL

1.75

1.00

2.00

4.9

4.85

3.63

3.75

Top Lever in

Open Position

Blown Fuse

Indicator

TOP

VIEW

4.50

3.08

1.50

4.16

.038" HOLES

.78 .63

.08

.30

.31

.08

.71

1.15 .05

.78

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.

Contact factory for additional live parts.

Part Number: 700-520-CL*

System Number: 0700520.ZXCL

Clip Lock Design (For CL-14)

Part Number: 700-530*

System Number: 0700530.Z

For use with all 3" diameter fuses.

* One Pair. Dimensions for reference only.

Part Number: 700-500*

System Number: 0700500.Z

For use with all 13 /16" (.8125”)

diameter PT fuses.

Mounting Details for Clip Lock

Part Number: 700-156*

System Number: 0700156.Z

For use with 1-9/16" to 1-5/8” (1.625”) diameter PT fuses.

Part Number: 700-300*

System Number: 0700300.Z

For use with 3" diameter fuses.

2.85

2.00

3.74

Catalog 63-75.indd 75 5/30/07 6:35:14 PM

Telecom Products

L17T Series Telecommunications Power Fuse 77

TLN Series Telecommunications Power Fuse 78

TLS Series Telecommunications Power Fuse 79

Alarm Indicating Fuses 80

LTFD 101 Series Telecommunications Disconnect Switch 81

LTFD Series Telecommunications Disconnect Switch 82

Telecom Products

www.littelfuse.com

Telecom Products

Catalog Number Ampere Rating Competitor A

Part Number

Competitor B

Part Number

L17T 70 70 TPL-BA TGL-BA

L17T 90 90 TPL-BC TGL-BC

L17T 100 100 TPL-BD TGL-BD

L17T 125 125 TPL-BE TGL-BE

L17 T 15 0 15 0 TPL-BF TGL- BF

L17T 175 175 TPL-BG TGL-BG

L17T 200 200 TPL-BH TGL-BH

L17T 225 225 TPL-BK TGL-BK

L17T 250 250 TPL-BL TGL-BL

L17T 300 300 TPL-CN TGL-CN

L17T 350 350 TPL-CO TGL-CO

L17T 400 400 TPL-CR TGL-CR

L17T 450 450 TPL-CU TGL-CU

L17T 500 500 TPL-CV TGL-CV

L17T 600 600 TPL-CZ TGL-CZ

L17T 800 800 TPL-CZH TGL-CZH

L17T 900 900 – –

L17T 1000 1000 – –

L17T 1100 1100 – –

L17T 1200 1200 – –

L17T Series Telecommunications Power Fuse

170 VDC • Current-Limiting • 70 – 1200 Amperes

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.

Contact Littelfuse for characteristic curves.

Ordering Information & Cross Reference

Specifications

Voltage Rating: 170 VDC

Interrupting Rating: 100,000 amperes

Ampere Range: 70 – 1200 amperes

Approvals: UL Recognized under the Components Program

(File No: E71611)

CSA Recognized under the Component Acceptance

Program (File No: LR29862)

Recommended Fuse Blocks

LTFD 6001 and LTFD 1200 series

Refer to the LTFD series in this catalog section for additional information.

Ampere Ratings

70 100 175 250 400 600 1000

80 125 200 300 450 800 1100

90 150 225 350 500 900 1200

Example part number (series & amperage): L17T 200

Features

• Low I2t

• Extremely current-limiting

• Low operating temperature

• 170 VDC rating

Ampere

Rating

Dimensions in Inches (mm in parentheses)

ABCDEFGH

70 – 250 15⁄32

(29.4)

17⁄8

(47.6)

23⁄16

(55.6)

2 21⁄32

(67.5)

(25.4)

7⁄8

(22.2)

5⁄16

(7.9)

3⁄16

(4.8)

300 – 800 11⁄4

(31.8)

115 ⁄16

(49.2)

29⁄16

(65.1)

31⁄2

(88.9)

11⁄2

(38.1)

(25.4)

13 ⁄32

(10.3)

1⁄4

(6.35)

1000–1200 111 ⁄32

(34.0) — —

41⁄16

(103.1) —11⁄2

(38.1) —

1⁄4

(6.35)

Telecom Products

78 www.littelfuse.com

Telecom Products

TLN Series Telecommunications Power Fuse

170 VDC • Current-Limiting • 1 – 600 Amperes

The TLN Series fuses are specifically designed for the protection of

telecommunications DC power distribution circuits.

FIG. 1

FIG. 2

Ampere Rating Dimensions in Inches (mm in parentheses)

ABCDEFGHJK

Figure 1

1 – 30 2 (50.8) 1⁄2 (12.7) 1⁄2 (12.7) 9⁄16 (14.3) 5⁄64 (2.0) 5⁄32 (4.0) 3⁄8 (9.5) — — —

35 – 60 3 (76.2) 3⁄4 (19.1) 5⁄8 (15.9) 13 ⁄16 (20.6) 3⁄32 (2.4) 3⁄16 (4.8) 5⁄8 (15.9) — — —

Figure 2

70 – 100 57⁄8 (149.2) 1 (25.4) 11⁄16 (27.0) 11⁄16 (27.0) 1⁄8 (3.2) 3⁄4 (19.1) 11⁄4 (31.6) 1⁄4 (6.4) 9⁄32 (7.1) 1⁄2 (12.7)

110 – 200 71⁄8 (181.0) 11⁄2 (38.1) 115 ⁄32 (37.3) 119 ⁄32 (40.5) 3⁄16 (4.8) 11⁄8 (28.6) 127⁄32 (46.8) 7⁄16 (11.1) 9⁄32 (7.1) 11 ⁄16 (17.5)

225 – 400 8 5⁄8 (219.1) 2 (50.8) 115 ⁄16 (49.2) 23⁄32 (53.2) 1⁄4 (6.4) 15⁄8 (41.3) 211 ⁄32 (59.5) 5⁄8 (15.9) 13⁄32 (10.3) 15 ⁄16 (23.8)

450 – 600 10 3⁄8 (263.5) 21⁄2 (63.5) 23⁄8 (60.3) 219 ⁄32 (65.9) 1⁄4 (6.4) 2 (50.8) 227⁄32 (72.2) 3⁄4 (19.1) 17⁄32 (13.5) 11⁄8 (28.6)

Specifications

Voltage Rating: 170 VDC

Interrupting Rating: 100,000 amperes

Ampere Range: 1 – 600 amperes

Approvals: UL Recognized under the components program

(File No: E71611)

Ampere Ratings

1154080150300600

3204590175350

5 25 50 100 200 400

63060110225450

10 35 70 125 250 500

Example part number (series & amperage): TLN450

Recommended Fuse Blocks

LR250 Series

Refer to the Blocks & Holders section of this catalog for additional information.

Features

• 170 VDC

• Fast acting and current-limiting

• 1 to 600 amperes

• Dimensionally similar to 250V Class R fuses

Replaces competitors’ TPN and TGN Series.

Telecom Products

www.littelfuse.com

Telecom Products

TLS Series Telecommunications Power Fuse

170 VDC • Current-Limiting • 1 – 125 Amperes

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.

Features

• 170 VDC

• Current-limiting

• 1 to 125 amperes

• Multiple mounting configurations

• RoHS Compliant

TLS-V TLS-L TLS-LB

TLS

Specifications

Voltage Rating: 170 VDC

Interrupting Rating: 100,000 amperes

Ampere Range: 1 – 125 amperes

Approvals: UL Recognized under the components program

(File No: E71611)

Construction: Caps: Silver-plated brass

Body: Glass melamine

Ampere Ratings

16255090

2103060100

3153570110

5204080125

Example part number (series & amperage): TLS050

Note: To order leaded versions of TLS fuses, add suffix V, L, LB, or LS to part

number.

Recommended Fuse Blocks

LTFD series disconnect switches

LT30060 for TLS series cartridge style fuse

Contact factory for more information.

Contact Littelfuse for characteristic curves. Dimensions for refer-

ence only. Replaces competitors’ TPS and TGS Series.

TLS-LS

Vertical Mount Leaded Bolt-In SolderCartridge

Telecom Products

80 www.littelfuse.com

Telecom Products

Telecommunications Power Fuses

Alarm Indicating Fuses

Specifications

Voltage Rating: 125 VAC, 300 VDC

Interrupting Rating: 1,000 amperes @ 125 VAC

1,000 amperes @ 300 VDC

Ampere Ratings

100mA 200mA 500mA 2 5

150mA 250mA 750mA 3 8

180mA 350mA 1.33 3.5 10

Ordering Information

10 Minute Rating Catalog Number System Number Color Code

100mA 70P 70P00000Z Grey/White

150mA 70R 70R00000Z Red/White

180mA 70E 70E00000Z Yellow

200mA 70X 70X00000Z Black

250mA 70F 70F00000Z Violet

250mA 70K 70K00000Z Violet/White

350mA 70S 70S00000Z Gray

500mA 70G 70G00000Z Red

750mA 70H 70H00000Z Brown

1.33A 70A 70A00000Z White

2A 70B 70B00000Z Orange

3A 70C 70C00000Z Blue

3.5A 70J 70J00000Z Black/White

5A 70D 70D00000Z Green/Black

8A 70M 70M00000Z Tan/White

10A 70N 70N00000Z Yellow/Purple

70 Series Alarm Indicating Fuses

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

• Rated 125 VAC, 300 VDC

481 Series Alarm Indicating Fuses

For telecommunications equipment and similar applications. Color coded

indicator flags indicate ampere rating. Body is constructed of black

polyphenylene sulfide with UL 94V0 flammability rating, contacts are of

bright alloy-plated beryllium copper. Available with or without protective lens.

Specifications

Voltage Rating: 125V AC, DC

Approvals: UL Recognized under the Components Program and

CSA Recognized under the Component Acceptance

Program.

Ampere Ratings

18 ⁄100 3⁄83⁄411⁄23512

1⁄51⁄2123

1⁄271⁄215

1⁄465⁄100 11⁄321⁄241020

Example part number (series & amperage): 481005

Recommended Fuse Blocks

482 Series

Available 1-20 pole with PCB or panel mounting

To order with protective lens add suffix XL

NOTE: For 481 Dummy fuse order 481000.

Telecom Products

www.littelfuse.com

Telecom Products

LTFD 101 Series Telecommunications Disconnect Switch

80 VDC • 1 – 125 Amperes

Specifications

Voltage Rating: 80 VDC

Ampere Range: 1 – 125 A

Approvals: UL Recognized (File No. E122874)

Recommended Fuses

Littelfuse TLS Series fuses

Littelfuse 481 Series Alarm fuses

Ordering Information

Catalog Number System Number Terminal Type

LTFD101-1 LTFD0101ZX1 Bullet

LTFD101-2 LTFD0101ZX2 Screw

LTFD101-3 LTFD0101ZX3 Stud

LTFD101-4 LTFD0101ZX4 Clip

Littelfuse compact LTFD 101 fuseholders for TLS fuses are designed for

quick installation into telecom equipment panels. Their modular design

fits into spaces originally designed for circuit breakers and they 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.

Features

• Extremely compact

• Quick mounting

• Replaces circuit breakers

• Includes alarm signaling circuit

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

6-32 INSERT

0.75"

2.50"

2.062" 1.940"

2.00" 0.85"

LOAD

LINE

3.75" 0.305" Dia.

Bullet Terminal

Alarm pin

0.02" x 0.11"

position optional

C

Telecom Products

82 www.littelfuse.com

Telecom Products

LTFD Series Telecommunications Disconnect Switch

145 VDC, 60 VDC • 70 – 1200 Amperes

Features

• Innovative pullout design of the 1200A switch eliminates the need for

tools to replace the fuse

• Thermoplastic housing material

• Alarm signaling circuit

Specifications

Voltage Rating: 145 VDC for 70 – 600 amperes

60 VDC for 800 – 1200 amperes

Ampere Range: 70 – 1200 amperes

Approvals: UL Recognized (E122674)

Recommended fuses

L17T Series fuses

Ordering Information

LTFD 6001 Series

(70–800 Amperes)

Catalog Number Stud Size (A) Amperes Contact Nut Max.

Torque

LTFD6001-00 3⁄4 – 16 x 3.5 in. 70 – 600 100 feet-pound

LTFD6001-01 7⁄8 – 14 x 3.5 in. 70 – 800 120 feet-pound

LTFD1200-01 1.12 – 12 x 4 in 900 – 1200 120 feet-pound

LTFD1200-01A 1.12 – 12 x 4 in 900 – 1200 120 feet-pound

LTFD 1200A

(900–1200 Amperes)

Littelfuse compact LTFD Series holders are designed for use as a

combination fuseholder and disconnect switch for telecommunications

equipment. The rugged unit utilizes a pull-out fuse carrier to safely

disconnect power and provide easy fuse replacement.

www.littelfuse.com

Special Purpose Fuses

Semiconductor Fuses 84

Traditional Semiconductor Fuses 85-87

LA15QS Semiconductor Fuses 88-89

LA30QS Semiconductor Fuses 90-91

LA50QS Semiconductor Fuses 92-93

LA60Q Semiconductor Fuses 94

LA60X Semiconductor Fuses 95

LA70QS Semiconductor Fuses 96-97

LA70QS French Cylindrical Fuses 98

LA100P Semiconductor Fuses 99-100

LA120X Semiconductor Fuses 101

Square Body Semiconductor Fuses 102-106

Fork-Lift and Stud-Mounted Fuses 107

Cable Limiters 108

LGR/LMF In-Line Fuses 109

LHR Holder 109

Special Purpose Fuses

84 www.littelfuse.com

Special Purpose Fuses

Semiconductor Fuses

150 – 1300 VAC • Very Fast Acting • 1 – 6000 Amperes

Semiconductor Fuses

Littelfuse Semiconductor fuses are very fast acting fuses designed

specifically for the protection of diodes, thyristors, triacs, and other

solid-state power semiconductor devices. These fuses are used in

power electronic applications including variable speed drives, power

rectifiers, UPS systems, and DC power supplies. They can be used

wherever extremely fast acting, current-limiting fuses are needed to

provide superior protection against the potentially damaging effects of

short-circuit currents.

The extensive line of Littelfuse Semiconductor fuses includes the

traditional round body fuses, enhanced state-of-the-art round body

fuses, and North American style square body fuses. Available ratings

range from 150 to 1300 volts and up to 6000 amps.

Applications

Semiconductor fuses are designed specifically for supplementary

protection of semiconducting devices such as silicon controlled rectifiers

(SCR’s), diodes, thyristors, triacs, transistors, and similar solid-state

devices. These devices are used in power equipment including variable

speed drives, power rectifiers, UPS systems, DC power supplies, and in

a wide range of electronic equipment.

May be used wherever extremely fast acting, current-limiting fuses with

no time-delay are required.Features & Benefits

• Extremely current-limiting

• Low I2t and peak let-through currents

• Low watts loss

• High Interrupting ratings

• UL Recognized

• Wide range of ampere ratings

• Optional mounting types

• DC ratings

• Superior cycling abilities

• Compact sizes

• Optional blown fuse indicators

Ratings

150V: 1 – 6000A

250V: 1 – 4500A

300V: 35 – 4500A

500V: 10 – 1200A

600V: 1 – 2000A

700V: 6 – 2500A

1000V: 15 – 1000A

1200V: 1 – 30A

1300V: 50 – 1800A

Recommended Fuse Blocks:

LSCR and 1LS series: Refer to the Blocks & Holders section of this catalog

for additional information.

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

Traditional Semiconductor Fuses

150/250/500/600/700 VAC • Very Fast Acting • 1 – 1200 Amperes

Ampere

Ratings

Series & Voltage

L15S

150V AC

150V DC (1 – 60A)

100V DC (70 – 1000A)

L25S

250V AC

250V DC (1 – 200A)

200V DC (225 – 800A)

L50S

500V AC

450V DC

L60S

600V AC

KLC‡

600V AC

L70S

700V AC

650V DC

1 L15S 1 L25S 1 – L60S 1 KLC 1 –

2 L15S 2 L25S 2 – L60S 2 KLC 2 –

3 L15S 3 L25S 3 – L60S 3 KLC 3 –

4 L15S 4 L25S 4 – L60S 4 KLC 4 –

5 L15S 5 L25S 5 – L60S 5 KLC 5 –

6 L15S 6 L25S 6 – L60S 6 KLC 6 –

7L15S 7 – – – KLC 7 –

8 L15S 8 L25S 8 – L60S 8 KLC 8 –

9L15S 9 – – – – –

10 L15S 10 L25S 10 L50S 10 L60S 10 KLC 10 L70S 10

12 L15S 12 L25S 12 L50S 12 L60S 12 KLC 12 –

15 L15S 15 L25S 15 L50S 15 L60S 15 KLC 15 L70S 15

171⁄2–––L60S 17

1⁄2KLC 171⁄2–

20 L15S 20 L25S 20 L50S 20 L60S 20 KLC 20 L70S 20

25 L15S 25 L25S 25 L50S 25 L60S 25 KLC 25 L70S 25

30 L15S 30 L25S 30 L50S 30 L60S 30 KLC 30 L70S 30

35 L15S 35 L25S 35 L50S 35 L60S 35 KLC 35 L70S 35

40 L15S 40 L25S 40 L50S 40 L60S 40 KLC 40 L70S 40

45 L15S 45 L25S 45 – L60S 45 KLC 45 –

50 L15S 50 L25S 50 L50S 50 L60S 50 KLC 50 L70S 50

60 L15S 60 L25S 60 L50S 60 L60S 60 KLC 60 L70S 60

70 L15S 70 L25S 70 L50S 70 L60S 70 KLC 70 L70S 70

80 L15S 80 L25S 80 L50S 80 L60S 80 KLC 80 L70S 80

90 L15S 90 L25S 90 L50S 90 L60S 90 KLC 90 L70S 90

100 L15S 100 L25S 100 L50S 100 L60S 100 KLC 100 L70S 100

110 – – – – KLC 110 –

125 L15S 125 L25S 125 L50S 125 L60S 125 KLC 125 L70S 125

150 L15S 150 L25S 150 L50S 150 L60S 150 KLC 150 L70S 150

175 – L25S 175 L50S 175 L60S 175 KLC 175 L70S 175

200 L15S 200 L25S 200 L50S 200 L60S 200 KLC 200 L70S 200

225 – L25S 225 L50S 225 L60S 225 KLC 225 L70S 225

250 L15S 250 L25S 250 L50S 250 L60S 250 KLC 250 L70S 250

275 – L25S 275 L50S 275 – – –

300 L15S 300 L25S 300 L50S 300 L60S 300 KLC 300 L70S 300

350 L15S 350 L25S 350 L50S 350 L60S 350 KLC 350 L70S 350

400 L15S 400 L25S 400 L50S 400 L60S 400 KLC 400 L70S 400

450 L15S 450 L25S 450 L50S 450 L60S 450 KLC 450 L70S 450

500 L15S 500 L25S 500 L50S 500 L60S 500 KLC 500 L70S 500

550 – – L50S 550 – – –

600 L15S 600 L25S 600 L50S 600 L60S 600 KLC 600 L70S 600

700 – L25S 700 L50S 700 L60S 700 KLC 700 L70S 700

800 L15S 800 L25S 800 L50S 800 L60S 800 KLC 800 L70S 800

900 – – LA50P9004 – – LA70P9004

1000 L15S 1000 – LA50P10004 – – LA70P10004

1200 – – LA50P12004 – – LA70P12004

‡ KLC series fuses are recommended for replacement use only.

Specifications

Voltage Ratings:

L15S: 150 V AC/DC (1 – 60A)

150 VAC (70 – 1000A)

100 VDC (70 – 1000A)

L25S: 250 V AC/DC (1 – 200A)

250 VAC (225 – 800A)

200 VDC (225 – 800A)

L50S: 500 VAC/450 VDC

L60S: 600 VAC

KLC: 600 VAC

L70S: 700VAC/650VDC

Interrupting Rating:

AC: 200,000 rms amperes

(L15S series 100,000A)

DC: 20,000 amperes

Ampere Range:

1 – 1200 amperes

See Rating Table for ratings available in each

series.

Approvals:

UL Recognized under the Components

Program and CSA Recognized under the

Component Acceptance Program.

UL File No: E71611

CSA File No: LR29862

L25S series fuses are Littelfuse Certified for

DC ratings shown in Rating Table.

Special Purpose Fuses

86 www.littelfuse.com

Special Purpose Fuses

Traditional Semiconductor Fuses

150/250/500/600/700 VAC • Very Fast Acting • 1 – 1000 Amperes

L15S SERIES, 150 VOLTS AC

(Replaces KLA, KLW, L13S)

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDE FGH

1 – 30 1 11⁄2

(38.1) —

3⁄8

(9.5)

13 ⁄32

(10.3) ————

31 – 60 1 2

(50.8) —

5⁄8

(15.9)

13 ⁄16

(20.6) ————

61 – 450 3 15⁄32

(29.4)

17⁄8

(47.6)

23⁄16

(55.6)

221⁄32

(67.5)

(25.4)

43⁄64

(17.1)

5⁄16

(7.9)

3⁄16

(4.8)

451 – 1000 3 11⁄4

(31.8)

115 ⁄16

(49.2)

29⁄16

(65.1)

31⁄2

(88.9)

11⁄2

(38.1)

(25.4)

13 ⁄32

(10.3)

1⁄4

(6.4)

Fig, 2

Fig. 1

Contact Littelfuse for characteristic curves.

L25S SERIES, 250 VOLTS AC

(Replaces KLB)

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDE FGH

1 – 30 1 2

(50.8) —

1⁄2

(12.7)

9⁄16

(14.3) ————

31 – 60 2 15⁄8

(41.3)

21⁄4

(57.2)

21⁄2

(63.5)

33⁄16

(81.0)

13⁄16

(20.6)

23⁄32

(18.3)

11⁄32

(8.7)

1⁄8

(3.2)

61 – 200 3 15⁄8

(41.3)

25⁄16

(58.7)

27⁄16

(61.9)

31⁄8

(79.4)

17⁄32

(31.0)

(25.4)

5⁄16

(7.9)

3⁄16

(4.8)

201 – 700 3 119 ⁄32

(40.5)

29⁄32

(57.9)

229⁄32

(73.8)

327⁄32

(97.6)

11⁄2

(38.1)

(25.4)

13⁄32

(10.3)

1⁄4

(6.4)

701 – 800 3 119 ⁄32

(40.5)

29⁄32

(57.9)

229⁄32

(73.8)

327⁄32

(97.6)

(50.8)

11⁄2

(38.1)

13⁄32

(10.3)

1⁄4

(6.4)

L50S SERIES, 500 VOLTS AC / 450 VOLTS DC

(Replaces KLH)

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDE FGH

10 – 30 1 2

(50.8) —

1⁄2

(12.7)

9⁄16

(14.3) ————

31 – 60 2 15⁄8

(41.3)

21⁄4

(57.2)

21⁄2

(63.5)

33⁄16

(81.0)

13⁄16

(20.6)

23⁄32

(18.3)

11⁄32

(8.7)

1⁄8

(3.2)

61 – 100 3 21⁄8

(54.0)

211⁄16

(68.3)

(76.2)

35⁄8

(92.1)

(25.4)

3⁄4

(19.1)

11⁄32

(8.7)

1⁄8

(3.2)

101 – 200 3 21⁄8

(54.0)

213⁄16

(71.4)

215 ⁄16

(74.6)

35⁄8

(92.1)

17⁄32

(31.0)

(25.4)

5⁄16

(7.9)

3⁄16

(4.8)

201 – 400 3 23⁄32

(53.2)

225⁄32

(70.6)

313⁄32

(86.5)

411⁄32

(110.3)

11⁄2

(38.1)

(25.4)

13⁄32

(10.3)

1⁄4

(6.4)

401 – 600 3 27⁄32

(56.4)

229⁄32

(73.8)

317⁄32

(89.7)

415 ⁄32

(113.5)

(50.8)

11⁄2

(38.1)

13⁄32

(10.3)

1⁄4

(6.4)

601 – 800 3 27⁄32

(56.4)

49⁄32

(108.7)

45⁄8

(117.5)

615 ⁄32

(164.3)

21⁄2

(63.5)

(50.8)

17⁄32

(13.5)

3⁄8

(9.5)

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

Fig. 4

Traditional Semiconductor Fuses

150/250/500/600/700 VAC • Very Fast Acting • 1 – 1000 Amperes

L70S SERIES, 700 VOLTS AC / 650 VOLTS DC

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDEFGHJ

10 – 30 1 2

(50.8) —

1⁄2

(12.7)

9⁄16

(14.3) —————

31 – 60 3 27⁄8

(73.0)

37⁄16

(87.3)

325⁄32

(96.0)

43⁄8

(111.1)

(25.4)

43⁄64

(17.1)

11 ⁄32

(8.7)

1⁄8

(3.2) —

61 – 100 3 27⁄8

(73.0)

39⁄16

(90.5)

311⁄16

(93.7)

43⁄8

(111.1)

17⁄32

(31.0)

29⁄32

(22.9)

5⁄16

(7.9)

3⁄16

(4.8) —

101 – 200 3 227⁄32

(72.2)

317⁄32

(89.7)

45⁄32

(105.6)

53⁄32

(129.4)

11⁄2

(38.1)

(25.4)

13 ⁄32

(10.3)

1⁄4

(6.4) —

201 – 400 3 227⁄32

(72.2)

317⁄32

(89.7)

45⁄32

(105.6)

53⁄32

(129.4)

(50.8)

11⁄2

(38.1)

13 ⁄32

(10.3)

1⁄4

(6.4) —

401 – 600 3 227⁄32

(72.2)

429⁄32

(124.6)

51⁄4

(133.4)

73⁄32

(180.2)

21⁄2

(63.5)

(50.8)

17⁄32

(13.5)

3⁄8

(9.5) —

601 – 800 4 35⁄16

(84.1)

55⁄16

(134.9)

613⁄16

(173.0) —27⁄8

(73.0)

(50.8)

5⁄8

(15.9)

3⁄8

(9.5)

5⁄16

(7.9)

KLC SERIES, 600 VOLTS AC

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDE FGH

1 – 30 2 17⁄8

(47.6)

21⁄2

(63.5) —27⁄8

(73.0)

9⁄16

(14.3)

13 ⁄32

(10.3)

1⁄4

(6.4)

3⁄64

(1.2)

31 – 60 2 23⁄4

(69.9)

33⁄8

(85.7)

35⁄8

(92.1)

45⁄16

(109.5)

13⁄16

(20.6)

23⁄32

(18.3)

11 ⁄32

(8.7)

1⁄8

(3.2)

61 – 100 3 27⁄8

(73.0)

321⁄32

(92.9)

41⁄16

(103.2)

(127.0)

(25.4)

3⁄4

(19.1)

13 ⁄32

(10.3)

1⁄8

(3.2)

101 – 200 3 227⁄32

(72.2)

317⁄32

(89.7)

43⁄8

(111.1)

53⁄32

(129.4)

11⁄2

(38.1)

(25.4)

13 ⁄32

(10.3)

1⁄4

(6.4)

201 – 400 3 227⁄32

(72.2)

421⁄32

(118.3)

427⁄32

(123.0)

61⁄4

(158.8)

(50.8)

15⁄8

(41.3)

9⁄16

(14.3)

1⁄4

(6.4)

401 – 800 3 227⁄32

(72.2)

421⁄32

(118.3)

511 ⁄32

(135.7)

61⁄4

(158.8)

21⁄2

(63.5)

(50.8)

9⁄16

(14.3)

3⁄8

(9.5)

L60S SERIES, 600 VOLTS AC

Ampere

Rating

Fig.

No.

Dimensions in Inches (mm in parentheses)

ABCDE FGH

1 – 30 1 5

(127.0) —

5⁄8

(15.9)

13⁄16

(20.6) ————

31 – 60 2 225⁄32

(70.6)

37⁄16

(87.3)

311⁄16

(93.7)

43⁄8

(111.1)

13⁄16

(20.6)

23⁄32

(18.3)

11⁄32

(8.7)

1⁄8

(3.2)

61 – 100 2 229⁄32

(73.8)

317⁄32

(89.7)

325⁄32

(96.0)

415 ⁄32

(113.5)

11⁄16

(27.0)

23⁄32

(18.3)

11⁄32

(8.7)

1⁄8

(3.2)

101 – 200 2 229⁄32

(73.8)

39⁄16

(90.5)

33⁄4

(95.3)

413⁄32

(111.9)

15⁄16

(33.3)

(25.4)

5⁄16

(7.9)

3⁄16

(4.8)

201 – 400 2 229⁄32

(73.8)

331⁄32

(100.8)

45⁄32

(105.6)

51⁄8

(130.2)

137⁄64

(40.1)

(25.4)

13⁄32

(10.3)

1⁄4

(6.4)

401 – 600 2 27⁄8

(73.0)

331⁄32

(100.8)

49⁄64

(105.2)

51⁄8

(130.2)

21⁄16

(52.8)

11⁄2

(38.1)

13⁄32

(10.3)

1⁄4

(6.4)

601 – 800 2 31⁄32

(77.0)

55⁄32

(133.4)

511⁄32

(135.7)

71⁄4

(184.2)

21⁄2

(63.5)

(50.8)

17⁄32

(13.5)

3⁄8

(9.5

Fig. 3

Contact Littelfuse for characteristic curves.

Special Purpose Fuses

88 www.littelfuse.com

Special Purpose Fuses

LA15QS Semiconductor Fuses

150 VAC • Very Fast Acting • 1 – 6000 Amperes

Specifications

Voltage Rating: AC: 150 volts

DC: 150 volts

Interrupting Rating: 100,000 Amperes

Ampere Range: 1 – 6000 Amperes

Approvals: UL Recognized under the components program.

LA 15 QS 400 -4 TI

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(150)

Integral Blown-

Fuse Indicator

Ferrule 1

Ferrule, midget dim. 2

Blades/Bolt-in 4

Hockey Puck, bolt-in 128

Trigger Indicator TI

Trigger Actuator IL

Contact Littelfuse for characteristic curves.

Note: Mounting types and integral blown fuse indicators are optional for

specified ratings.

Littelfuse LA15QS series Semiconductor fuses were designed for the

specific protection of diodes and other semiconductor devices rated

150VAC/DC. The LA15QS product line compact design is perfect for

those applications that have limitations on available space.

Features

• Low I2t minimizes damage to protected components on short-circuit.

• Controlled arc voltage reduces stress to circuit components during

fuse clearing.

• Choice of mounting types provides options for unique termination

requirements.

• Indicator options allow identification of blown fuses.

Applications

Protection of heavy duty devices such as electromechanical rectifiers.

Ordering Information

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

Ampere

Rating

Littelfuse

Catalog Number

Mounting

Type

Maximum

Clearing I2t @150

VAC (A2S x 103)

Watts Loss @

Rated Current

(W)

1 LA15QS1-2 2 0.0002 0.68

2 LA15QS2-2 2 0.001 1.3

3 LA15QS3-2 2 0.003 1.7

4 LA15QS4-2 2 0.007 2.1

5 LA15QS5-2 2 0.012 2.8

6 LA15QS6-2 2 0.022 3.1

7 LA15QS7-2 2 0.011 2.2

8 LA15QS8-2 2 0.015 2.5

10 LA15QS10-2 2 0.019 2.6

12 LA15QS12-2 2 0.030 3

15 LA15QS15-2 2 0.042 3

20 LA15QS20-2 2 0.072 4

25 LA15QS25-2 2 0.14 5.2

30 LA15QS30-2 2 0.25 5.6

35 LA15QS35-1 1 0.21 9

40 LA15QS40-1 1 0.28 10

40 LA15QS40-4TI 4TI 0.39 3.1

45 LA15QS45-1 1 0.34 12

50 LA15QS50-1 1 0.47 13

50 LA15QS50-4 4 0.64 4

55 LA15QS55-1 1 Contact Factory Contact Factory

60 LA15QS60-1 1 0.94 14

70 LA15QS70-4 4 2 5.6

70 LA15QS70-4TI 4TI 2 5.6

80 LA15QS80-4 4 2.5 8

80 LA15QS80-4TI 4TI 2.5 8

90 LA15QS90-4 4 3.1 9

100 LA15QS100-4 4 3.6 10

100 LA15QS100-4TI 4TI 3.6 10

130 LA15QS130-4 4 5.3 14

130 LA15QS130-4TI 4TI 5.3 14

150 LA15QS150-4 4 6.8 16

150 LA15QS150-4IL 4IL 6.8 16

150 LA15QS150-4TI 4TI 6.8 16

200 LA15QS200-4 4 9 22

200 LA15QS200-4IL 4IL 9 22

250 LA15QS250-4 4 15 22

LA15QS Semiconductor Fuses

150 VAC • Very Fast Acting • 1 – 6000 Amperes

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse

Catalog Number

Mounting

Type

Maximum

Clearing I2t @150

VAC (A2S x 103)

Watts Loss @

Rated Current

(W)

250 LA15QS250-4TI 4TI 15 27

300 LA15QS300-4 4 22 33

300 LA15QS300-4IL 4IL 22 33

300 LA15QS300-4TL 4TI 22 33

350 LA15QS350-4 4 32 40

350 LA15QS350-4TI 4TI 32 40

400 LA15QS400-4 4 40 45

400 LA15QS400-4IL 4IL 40 45

400 LA15QS400-4TI 4TI 40 45

450 LA15QS450-4 4 50 50

450 LA15QS450-4IL 4IL 50 50

500 LA15QS500-4 4 90 30

500 LA15QS500-4IL 4IL 90 30

600 LA15QS600-4 4 130 35

600 LA15QS600-4IL 4IL 130 35

800 LA15QS800-4 4 290 57

1000 LA15QS1000-4 4 520 75

1000 LA15QS1000-4IL 4IL 520 75

1000 LA15QS1000-4TI 4TI 520 75

1000 LA15QS1000-128 128 540 88

1000 LA15QS1000-128IL 128IL 540 88

1200 LA15QS1200-128 128 680 100

1200 LA15QS1200-128IL 128IL 680 100

1500 LA15QS1500-128 128 1200 130

1500 LA15QS1500-128IL 128IL 1200 130

2000 LA15QS2000-128 128 1900 165

2000 LA15QS2000-128IL 128IL 1900 165

2500 LA15QS2500-128 128 3200 195

2500 LA15QS2500-128IL 128IL 3200 195

3000 LA15QS3000-128 128 4800 240

3000 LA15QS3000-128IL 128IL 4800 240

3500 LA15QS3500-128 128 6500 260

4000 LA15QS4000-128 128 8500 270

4000 LA15QS4000-128IL 128IL 8500 270

5000 LA15QS5000-128 128 Contact Factory Contact Factory

6000 LA15QS6000-128 128 Contact Factory Contact Factory

Dimensions Dimensions for reference only.

Amperes Mount.

Type

Fig.

No.

Dimensions in Inches (mm in parentheses) Tap

ABCDEFGH

1 – 30 2 11.50 (38.1)0.41 (10.4)–––––– –

35 – 60 1 12.00 (50.8)0.81 (20.6)–––––– –

70 – 450 4, 4TI*, 4IL* 2, 3* 2.66 (67.6) 1.13 (28.7) 1.16 (29.5) 2.19 (55.6) 1.91 (48.5) 0.31 (7.9) 0.88 (22.4) 0.19 (4.8) –

500 – 1000 4, 4TI*, 4IL* 2, 3* 3.50 (88.9) 1.50 (38.1) 1.25 (31.8) 2.56 (65.0) 1.94 (49.3) 0.41 (10.4) 1.00 (25.4) 0.25 (6.4) –

750 – 2000 128, 128IL* 4, 5* 1.88 (47.9) 2.00 (50.8) 1.63 (41.4) 1.75 (44.5) 1.00 (25.4) – – – 3⁄8-24-1⁄2 deep

2500 – 3000 128, 128IL* 4, 5* 1.88 (47.9) 3.00 (76.2) 1.63 (41.4) 2.50 (63.5) 1.50 (38.1) – – – 1⁄2-20-1⁄2 deep

3500 – 4000 128, 128IL* 6, 7* 1.88 (47.9) 3.50 (88.9) 1.63 (41.4) 3.00 (76.2) 1.06 (27.0) 1.06 (27.0) – – 1⁄2-20-1⁄2 deep

5000 – 6000 128 8 2.38 (60.5) 5.75 (146) 1.88 (47.7) 5.00 (127) 1.50 (38.1) 1.50 (38.1) – – 1⁄2-20-1⁄2 deep

* Optional Trigger Actuator (IL)

Figure 1 Figure 2 Figure 3

Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Special Purpose Fuses

90 www.littelfuse.com

Special Purpose Fuses

LA 30 QS 600 -4 TI

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(300)

Integral Blown-

Fuse Indicator

Ferrule 1

Blades/Bolt-in 4

Hockey Puck, bolt-in 128

Trigger Indicator TI

Trigger Actuator IL

LA30QS Semiconductor Fuses

300 VAC • Very Fast Acting • 35 – 4500 Amperes

Specifications

Voltage Rating: AC: 300 volts

DC: 300 volts

Interrupting Rating: 200,000 Amperes

Ampere Range: 35 – 4500 Amperes

Approvals: UL Recognized under the components program.

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.

Features

• Low I2t minimizes damage to protected components on short-circuit.

• Controlled arc voltage reduces stress to circuit components during

fuse clearing.

• Choice of mounting types provides options for unique termination

requirements.

• Indicator options allow identification of blown fuses.

• Superior DC capabilities.

Applications

Protection of 300 volt heavy duty rectifiers and similar heavy duty

power supplies.

Ordering Information

Note: Mounting types and integral blown fuse indicators are optional for

specified ratings.

Contact Littelfuse for characteristic curves.

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

LA30QS Semiconductor Fuses

300 VAC • Very Fast Acting • 35 – 4500 Amperes

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t

@300 VAC

(A2S x 103)

Watts Loss

@ Rated

Current (W)

35 LA30QS35-4 4 0.9 6.4

40 LA30QS40-4 4 1.2 7

50 LA30QS50-4 4 2 9.9

60 LA30QS60-4 4 2.7 11.6

70 LA30QS70-4 4 1.6 11

80 LA30QS80-4 4 2.6 11

90 LA30QS90-4 4 3.2 13

100 LA30QS100-4 4 4.1 13

100 LA30QS100-4TI 4TI 4.1 13

125 LA30QS125-4 4 6.3 16

130 LA30QS130-4 4 6.3 16

150 LA30QS150-4 4 9.3 19

150 LA30QS150-4TI 4TI 9.3 19

175 LA30QS175-4 4 10 27

200 LA30QS200-4 4 15 30

200 LA30QS200-4TI 4TI 15 30

225 LA30QS225-4 4 22 33

250 LA30QS250-4 4 25 41

250 LA30QS250-4TI 4TI 25 41

300 LA30QS300-4 4 37 47

300 LA30QS300-4TI 4TI 37 47

350 LA30QS350-4 4 62 49

400 LA30QS400-4 4 83 56

400 LA30QS400-4IL 4IL 83 56

400 LA30QS400-4TI 4TI 83 56

450 LA30QS450-4 4 130 53

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t

@300 VAC

(A2S x 103)

Watts Loss

@ Rated

Current (W)

500 LA30QS500-4 4 160 59

550 LA30QS550-4 4 190 65

600 LA30QS600-4 4 230 69

600 LA30QS600-4TI 4TI 230 69

600 LA30QS600-4IL 4IL 230 69

700 LA30QS700-4 4 260 90

700 LA30QS700-128 128 260 73

800 LA30QS800-4 4 330 108

800 LA30QS800-4IL 4IL 330 108

800 LA30QS800-128 128 330 84

1000 LA30QS1000-128 128 460 105

1000 LA30QS1000-128IL 128IL 460 105

1200 LA30QS1200-128 128 880 110

1500 LA30QS1500-128 128 1400 140

1500 LA30QS1500-128IL 128IL 1400 140

1600 LA30QS1600-128 128 1690 150

2000 LA30QS2000-128 128 2600 190

2000 LA30QS2000-128IL 128IL 2600 190

2500 LA30QS2500-128 128 4000 230

2500 LA30QS2500-128IL 128IL 4000 230

3000 LA30QS3000-128 128 4700 340

3500 LA30QS3500-128 128 6500 380

3500 LA30QS3500-128IL 128IL 6500 380

4000 LA30QS4000-128 128 8600 450

4500 LA30QS4500-128 128 11000 500

1.17

0.50

TAP

[ 29.8 mm ]

[ 12.8 mm ]

Figure 1 Figure 2 Figure 3

Figure 4 Figure 5 Figure 6

Dimensions Dimensions for reference only.

Amperes Mount. Type Fig. No. Dimensions in Inches (mm in parentheses) Tap

ABCDEFGH

35 – 60 4 1 3.19 (81.0) 0.81 (20.6) 1.63 (41.4) 2.50 (63.5) 2.25 (57.5) 0.34 (8.6) 0.72 (18.3) 0.13 (3.3) –

70 – 200 4 2 3.13 (79.5) 1.22 (31.0) 1.63 (41.4) 2.44 (62.0) 2.31 (58.7) 0.31 (7.9) 1.00 (25.4) 0.19 (4.8) –

225 – 700 4, 4IL* 2, 3* 3.84 (97.5) 1.50 (38.1) 1.59 (40.1) 2.91 (73.9) 2.28 (57.9) 0.41 (10.4) 1.00 (25.4) 0.25 (6.4) –

700 – 1200 128 4 2.59 (65.8) 3.00 (76.2) 2.34 (59.4) 2.50 (63.5) 1.50 (38.1) – – – 3⁄8-24-1⁄2 deep

1500 – 2500 128, 128IL* 5, 6* 2.59 (65.8) 3.50 (88.9) 2.34 (59.4) 3.00 (76.2) 1.50 (38.1) 1.50 (38.1) – – 3⁄8-24-1⁄2 deep

3000 – 4500 128, 128IL* 5, 6* 2.59 (65.8) 4.50 (114) 2.34 (59.4) 3.75 (95.3) 1.50 (38.1) 1.50 (38.1) – – 1⁄2-20-1⁄2 deep

* Optional Actuator (IL)

Special Purpose Fuses

92 www.littelfuse.com

Special Purpose Fuses

LA 50 QS 250 -4

Style

Littelfuse

Ampere Rating

Mounting Type

(Blades/Bolt-in)

Voltage

(500)

LA50QS Semiconductor Fuses

500 VAC • Very Fast Acting • 35 – 1200 Amperes

Specifications

Voltage Rating: AC: 500 volts

DC: 500 volts

Interrupting Rating: AC: 200,000 Amperes

DC: 100,000 Amperes

Ampere Range: 35 – 1200 Amperes

Approvals: UL Recognized under the components program

CSA Certified.

In response to new equipment requirements, Littelfuse LA50QS

series fuses were developed to improve the overall performance

of semiconductor fuses. The LA50QS provides the best protection

features including lower I2t, longer life when subjected to cyclic loading

and lower watts loss. LA50QS is today’s choice for the protection of

dynamic solid state equipment.

Features

• Lowest I2t for greatest protection of semiconductor circuits.

• Low watts loss for cooler operation.

• Superior cycling ability gives an equipment design advantage.

• State-of-the-art protection for 500 volt equipment.

• Ultra compact sizes allow down-sizing of existing equipment.

Applications

Protection of 500 volts or less solid state equipment such as motor

drives, UPS, inverters, etc.

Ordering Information

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

LA50QS Semiconductor Fuses

500 VAC • Very Fast Acting • 35 – 1200 Amperes

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @500

VAC (A2S x 103)

Watts Loss

@ Rated

Current (W)

35 LA50QS35-4 4 0.56 6

40 LA50QS40-4 4 0.69 7

50 LA50QS50-4 4 1.1 8

60 LA50QS60-4 4 1.8 10

70 LA50QS70-4 4 1.9 12

80 LA50QS80-4 4 2.6 14

90 LA50QS90-4 4 3.6 15

100 LA50QS100-4 4 4.4 17

125 LA50QS125-4 4 5.6 21

150 LA50QS150-4 4 9 25

175 LA50QS175-4 4 15 29

200 LA50QS200-4 4 20 33

225 LA50QS225-4 4 25 37

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @500

VAC (A2S x 103)

Watts Loss

@ Rated

Current (W)

250 LA50QS250-4 4 29 41

300 LA50QS300-4 4 55 49

350 LA50QS350-4 4 88 57

400 LA50QS400-4 4 98 65

450 LA50QS450-4 4 130 69

500 LA50QS500-4 4 160 77

600 LA50QS600-4 4 220 92

700 LA50QS700-4 4 270 110

800 LA50QS800-4 4 360 130

900 LA50QS900-4 4 500 140

1000 LA50QS1000-4 4 560 160

1200 LA50QS1200-4 4 930 175

Dimensions

Dimensions for reference only.

Amperes Mount.

Type

Dimensions in Inches (mm in parentheses)

ABCDEFGH

35 – 100 4 3.63

(92.2)

1.00

(25.4)

2.13

(54.1)

2.94

(74.7)

2.75

(69.9)

0.31

(7.9)

0.75

(19.1)

0.13

(3.3)

125 – 200 4 3.63

(92.2)

1.22

(31.0)

2.13

(54.1)

2.94

(74.7)

2.81

(71.4)

0.31

(7.9)

1.00

(25.4)

0.19

(4.8)

225 – 400 4 4.34

(110)

1.50

(38.1)

2.09

(53.1)

3.41

(86.6)

2.78

(70.6)

0.41

(10.4)

1.00

(25.4)

0.25

(6.4)

450 – 600 4 4.47

(114)

2.00

(50.8)

2.22

(56.4)

3.53

(89.7)

2.91

(73.9)

0.41

(10.4)

1.50

(38.1)

0.25

(6.4)

700 – 800 4 6.47

(164.3)

2.50

(63.5)

2.22

(56.4)

5.00

(127.0)

3.44

(87.3)

0.53

(13.5)

1.50

(38.1)

0.25

(6.4)

900 – 1200 4 6.97

(177.0)

3.00

(76.2)

3.22

(81.8)

5.47

(138.9)

4.47

(113.5)

0.63

(15.9)

2.38

(60.3)

0.44

(11.1)

Contact Littelfuse for characteristic curves.

Special Purpose Fuses

94 www.littelfuse.com

Special Purpose Fuses

LA 60 Q 30 -2

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(300)

Ferrule, midget dim. 1-½” x 13 /32”

LA60Q Semiconductor Fuses

600 VAC • Very Fast Acting • 5 – 40 Amperes

Specifications

Voltage Rating: AC: 600 volts

DC: 600 volts

Interrupting Rating: AC: 200,000 Amperes

DC: 100,000 Amperes

Ampere Range: 5 – 40 Amperes

Approvals: UL Recognized under the components program.

Recommended Fuse Blocks

LPSM or L60030M

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @600

VAC (A2S)

Watts Loss @

Rated Current (W)

5LA60Q5-22 60 0.7

8LA60Q8-22 70 1.1

10 LA60Q10-2 2 110 1.6

12 LA60Q12-2 2 150 2

15 LA60Q15-2 2 180 3

20 LA60Q20-2 2 330 4.4

25 LA60Q25-2 2 440 5.5

30 LA60Q30-2 2 860 5.6

35 LA60Q35-2 2 1300 6.4

40 LA60Q40-2 2 1800 7

Contact Littelfuse for characteristic curves.

Littelfuse LA60Q semiconductor protection fuses feature a 600 volt

AC/DC rating in a compact size (11⁄2” 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.

Features

• Lowest I2t of any fuse this size for greater protection.

• Excellent cycling ability gives advantage in equipment design.

Dimensions (in inches)

Ordering Information

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

LA 60 X 700 -128

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(300)

Hockey Puck, bolt-in

LA60X Semiconductor Fuses

600 VAC • Very Fast Acting • 700 – 2000 Amperes

Littelfuse LA60X semiconductor protection fuses are popular for the

protection of higher voltage heavy rectifiers such as traction rectifiers.

They can carry long sustained overloads common with heavy-duty

apparatus. The compact “hockey puck” design provides high power

protection in a small space.

Features

• Lowest I2t minimizes damage to protected components on

short- circuit.

• Controlled arc voltage reduces stress to circuit components during

fuse clearing.

Applications

Protection of heavy traction and electrochemical as well as rectifiers and

other heavy-duty equipment.

Ordering Information

Dimensions Dimensions for reference only.

Amperes Mount.

Type

Fig.

No.

Dimensions in Inches (mm in parentheses) Tap

ABCDEF

700 – 800 128 1 4.00

(102)

3.00

(76.2)

3.75

(95.3)

2.50

(63.5)

1.50

(38.1) -3⁄8-24-1⁄2 deep

1000 – 1200 128 2 4.00

(102)

3.50

(88.9)

3.75

(95.3)

3.00

(76.2)

1.50

(38.1)

1.50

(38.1)

3⁄8-24-1⁄2 deep

1500 – 2000 128 2 4.00

(102)

4.50

(114)

3.75

(95.3)

3.75

(95.3)

1.50

(38.1)

1.50

(38.1)

1⁄2-20-1⁄2 deep

Contact Littelfuse for technical information.

Figure 1 Figure 2

Specifications

Voltage Rating: AC: 600 volts

Interrupting Rating: AC: 100,000 Amperes

Ampere Range: 700 – 2000 Amperes

Approvals: UL Recognized under the components program.

Ampere Ratings

700 1200 1800

800 1500 2000

1000 1600

Special Purpose Fuses

96 www.littelfuse.com

Special Purpose Fuses

LA 70 QS 150 -4

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(300)

Blades/Bolt-in

LA70QS Semiconductor Fuses

700 VAC • Very Fast Acting • 35 – 800 Amperes

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.

Features

• Very low 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.

Applications

Protection of 700 volt or less solid state equipment such as motor

drives, UPS, inverters, etc.

Ordering Information

Specifications

Voltage Rating: AC: 700 Volts

DC: 700 Volts

Interrupting Rating: AC: 200,000 Amperes

DC: 100,000 Amperes

Ampere Range: 35 – 800 Amperes

Approvals: UL Recognized under the components program.

CSA Certified.

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

Ampere

Rating

Littelfuse

Catalog Number

Mounting

Type

Maximum

Clearing I2t @700

VAC (A2S x 103)

Watts Loss @

Rated Current (W)

200 LA70QS200-4 4 19 41

200 LA70QS200-4K 4 19 41

250 LA70QS250-4 4 42 42

300 LA70QS300-4 4 55 53

350 LA70QS350-4 4 72 64

400 LA70QS400-4 4 99 75

450 LA70QS450-4 4 125 75

450 LA70QS450-4K 4K 125 75

500 LA70QS500-4 4 150 92

500 LA70QS500-4K 4K 160 92

600 LA70QS600-4 4 222 116

600 LA70QS600-4K 4K 222 116

700 LA70QS700-4 4 332 125

800 LA70QS800-4 4 433 143

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @700

VAC (A2S x 103)

Watts Loss @

Rated Current (W)

35 LA70QS35-4 4 0.47 6.2

40 LA70QS40-4 4 0.58 7.5

50 LA70QS50-4 4 0.88 9.8

60 LA70QS60-4 4 1.2 12

70 LA70QS70-4 4 1.8 15

80 LA70QS80-4 4 2.3 16

90 LA70QS90-4 4 3 20

100 LA70QS100-4 4 3.6 24

125 LA70QS125-4 4 6.9 22

125 LA70QS125-4K 4K 6.9 22

150 LA70QS150-4 4 11 28

150 LA70QS150-4K 4K 11 29

175 LA70QS175-4 4 14 35

175 LA70QS175-4K 4K 14 35

LA70QS Semiconductor Fuses

700 VAC • Very Fast Acting • 35 – 800 Amperes

Catalog Numbers & Technical Data

Dimensions Dimensions for reference only.

Amperes Mount. Type Dimensions in Inches (mm in parentheses)

ABCDEFGH

35 – 100 4 4.38

(111)

1.00

(25.4)

2.88

(73)

3.69

(93.6)

3.50

(88.9)

0.31

(7.9)

0.75

(19.0)

0.13

(3.2)

125 – 200 4 4.38

(111)

1.22

(31.0)

2.88

(73)

3.69

(93.6)

3.56

(90.5)

0.31

(7.9)

1.00

(25.4)

0.19

(4.8)

125 – 200 4K 5.09

(129)

1.22

(31.0)

2.88

(73)

4.19

(106)

3.50

(88)

0.41

(10.3)

1.00

(25.4)

0.19

(4.8)

225 – 400 4 5.09

(129)

1.50

(38.1)

2.84

(72.2)

4.16

(106)

3.53

(89.7)

0.40

(10.3)

1.50

(38.1)

0.25

(6.4)

450 – 600 4 5.09

(129)

2.00

(50.8)

2.84

(72.2)

4.16

(106)

3.53

(89.7)

0.41

(10.3)

1.50

(38.1)

0.25

(6.4)

450 – 600 4K 7.09

(180)

2.00

(50.8)

2.84

(72.2)

6.16

(156)

3.53

(89.7)

0.53

(13.5)

1.50

(38.1)

0.25

(6.4)

700 – 800 4 7.09

(180)

2.50

(63.5)

2.84

(72.2)

5.28

(134)

4.91

(125)

0.53

(13.5)

2.00

(50.8)

0.38

(9.5)

Contact Littelfuse for characteristic curves.

Special Purpose Fuses

98 www.littelfuse.com

Special Purpose Fuses

LA 70 QS 20 -14F I

Style

Littelfuse

Ampere Rating

Size

Voltage

(700)

Optional Striker

14 x 51mm 14F

22 x 58mm 22F

(I)

LA70QS French Cylindrical Fuses

690 Volts • Very Fast Acting • 10 – 100 Amperes

Specifications

Voltage Rating: AC: 690 Volts

DC: 700 Volts

Interrupting Rating: AC: 200,000 Amperes

DC: 100,000 Amperes

Ampere Range: 10 – 100 Amperes

Approvals: UL Recognized under the components program.

CSA Certified.

Recommended Fuse Blocks

CYH series for non-striker fuses LA70QS(amp)22F

LPSG series for the striker style LA70QS(amp)22FI

Ordering Information

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse

Catalog

Number

(No Striker)

Littelfuse

Catalog

Number

(With Striker)

Body

Size

Maximum

Clearing I2t

@700 VAC

(A2S x 103)

Watts Loss

@ Rated

Current (W)

10 LA70QS10-14F LA70QS10-14FI 14x51 0.04 3.5

12 LA70QS12-14F LA70QS12-14FI 14x51 0.06 4.4

16 LA70QS16-14F LA70QS16-14FI 14x51 0.10 4.8

20 LA70QS20-14F LA70QS20-14FI 14x51 0.16 5.2

25 LA70QS25-14F LA70QS25-14FI 14x51 0.27 5.8

32 LA70QS32-14F LA70QS32-14FI 14x51 1.50 7.0

40 LA70QS40-14F LA70QS40-14FI 14x51 0.70 10.7

50 LA70QS50-14F LA70QS50-14FI 14x51 1.50 11.6

20 LA70QS20-22F LA70QS20-22FI 22x58 0.076 8.0

25 LA70QS25-22F LA70QS25-22FI 22x58 0.125 10.0

32 LA70QS32-22F LA70QS32-22FI 22x58 0.27 11.0

40 LA70QS40-22F LA70QS40-22FI 22x58 0.48 13.0

50 LA70QS50-22F LA70QS50-22FI 22x58 0.80 14.9

63 LA70QS63-22F LA70QS63-22FI 22x58 1.85 16.0

80 LA70QS80-22F LA70QS80-22FI 22x58 3.80 17.8

100 LA70QS100-22F LA70QS100-22FI 22x58 8.00 19.0

Fuse Size Dimensions in mm

ABCDE

14x51 (no striker) 14 51 14 – –

22x58 (no striker) 22 58 16 – –

14x51 (with striker) 14 51 14 7.5 3.8

22x58 (with striker) 22 58 16 7.5 3.8

Dimensions for reference only.

Littelfuse French Cylindrical style semiconductor fuses are an extension

to the LA70QS series. They offer a solid-fill design with high interrupting

ratings and an optional striker for visual or remote blown fuse indication.

The international 14x51mm and 22x58mm sizes are accepted

worldwide.

Special Purpose Fuses

www.littelfuse.com

Special Purpose Fuses

LA 100 P 80 -4 TI

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(1000)

Integral Blown-

Fuse Indicator

Ferrule 1

Blades/Bolt-in 4

Trigger Indicator TI

LA100P Semiconductor Fuses

1000 VAC • Very Fast Acting • 15 – 1000 Amperes

Specifications

Voltage Rating: AC: 1000 Volts

DC: 750 Volts

Interrupting Rating: 100,000 Amperes

Ampere Range: 15 – 1000 Amperes

Approvals: UL Recognized under the components program.

Littelfuse LA100P semiconductor protection fuses are rated 1000V,

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.

Features

• Low I2t minimizes damage to protected components on short-circuit.

• Controlled arc voltage reduces stress to circuit components during

fuse clearing.

Applications

Protection of UPS systems, AC/DC drives, reduced voltage motor

starters and other 1000V or less semiconductor devices.

Ordering Information

Note: Mounting types and integral blown fuse indicators are optional for

specified ratings.

Special Purpose Fuses

100 www.littelfuse.com

Special Purpose Fuses

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @1000

VAC (A2S x 103)

Watts Loss @

Rated Current (W)

200 LA100P200-4 4 72 36

200 LA100P200-4TI 4TI 72 36

225 LA100P225-4 4 91 40

250 LA100P250-4 4 110 46

300 LA100P300-4 4 160 55

300 LA100P300-4TI 4TI 160 55

350 LA100P350-4 4 220 65

350 LA100P350-4TI 4TI 220 65

400 LA100P400-4 4 290 70

400 LA100P400-4TI 4TI 290 70

500 LA100P500-4 4 450 90

500 LA100P500-4TI 4TI 450 90

600 LA100P600-4 4 650 110

600 LA100P600-4TI 4TI 650 110

650 LA100P650-4 4 780 120

700 LA100P700-4 4 880 125

800 LA100P800-4 4 1200 140

800 LA100P800-4TI 4TI 1200 140

1000 LA100P1000-4 4 1900 190

Ampere

Rating

Littelfuse

Catalog

Number

Mounting

Type

Maximum

Clearing I2t @1000

VAC (A2S x 103)

Watts Loss @

Rated Current (W)

15 LA100P15-1 1 0.6 3.4

20 LA100P20-1 1 0.8 5.9

25 LA100P25-1 1 1,3 9

30 LA100P30-1 1 1.5 12.8

35 LA100P35-4 4 2.2 7.3

40 LA100P40-4 4 2.9 8.3

50 LA100P50-4 4 4.5 11

50 LA100P50-4TI 4TI 4.5 11

60 LA100P60-4 4 6.5 13

60 LA100P60-4TI 4TI 6.5 13

70 LA100P70-4TI 4TI 8.8 13

80 LA100P80-4 4 12 14

80 LA100P80-4TI 4TI 12 14

100 LA100P100-4 4 18 18

100 LA100P100-4TI 4TI 18 18

125 LA100P125-4 4 28 23

125 LA100P125-4TI 4TI 28 23

150 LA100P150-4 4 41 28

150 LA100P150-4TI 4TI 41 28

LA100P Semiconductor Fuses

1000 VAC • Very Fast Acting • 15 – 1000 Amperes

Catalog Numbers & Technical Data

Dimensions Dimensions for reference only.

Amperes Mount. Type Fig. No. Dimensions in Inches (mm in parentheses)

ABCDEFGHJ

15 – 30 1 1 2.53

(66.8)

0.56

(14.2) –––––––

35 – 60 4, 4TI 2 5.00

(127)

1.00

(25.4)

3.50

(173)

4.31

(109)

4.19

(106)

0.31

(7.9)

0.75

(19.1)

0.13

(3.3) –

65 – 100 4, 4TI 2 5.00

(127)

1.22

(31)

3.50

(173)

4.31

(109)

4.19

(106)

0.31

(7.9)

1.00

(25.4)

0.19

(4.8) –

125 – 200 4, 4TI 2 5.72

(145)

2.00

(38.1)

3.47

(88.1)

4.78

(121)

4.16

(106)

0.41

(10.4)

1.00

(25.4)

0.25

(6.4) –

225 – 400 4, 4TI 2 5.72

(145)

2.00

(50.8)

3.47

(88.1)

4.78

(121)

4.16

(106)

0.41

(10.4)

1.50

(25.4)

0.25

(6.4) –

500 – 600 4, 4TI 2 7.72

(196)

2.50

(63.5)

3.47

(88.1)

5.88

(149)

5.56

(147)

0.53

(13.5)

2.00

(50.8)

0.38

(9.7) –

650 – 800 4, 4TI 3 7.4 4

(189)

2.88

(73.2)

3.94

(100)

5.94

(151) –0.63

(16)

2.00

(50.8)

0.38

(9.7)

0.31

(7.9)

1000 4 4 8.22

(209)

3.50

(88.9)

4.47

(114)

6.59

(167)

5.84

(148)

0.63

(16)

2.75

(69.9)

0.50

(12.7)

1.38

(35.1)

Contact Littelfuse for characteristic curves.

Figure 1

Figure 3

Figure 2

Figure 4

Special Purpose Fuses

101

www.littelfuse.com

Special Purpose Fuses

LA 120 X 25 -1

Style

Littelfuse

Ampere Rating

Mounting Type

Voltage

(1200)

Ferrule

Catalog Numbers & Technical Data

Ampere

Rating

Littelfuse Catalog

Number Mounting Type Maximum Clearing I2t

@1200 VAC (A2S)

1⁄2LA120A1/2-1 1 1.9

1LA120X1-1 1 7.5

2LA120X2-1 1 30

3LA120X3-1 1 69

4 LA120X4-1 1 120

5LA120X5-1 1 190

6LA120X6-1 1 280

10 LA120X10-1 1 970

15 LA120X15-1 1 2100

20 LA120X20-1 1 3700

25 LA120X25-1 1 5700

30 LA120X30-1 1 8300

LA120X Semiconductor Fuses

1200 VAC • Very Fast Acting • 1/2 – 30 Amperes

Littelfuse LA120X semiconductor protection fuses, rated 1/2 through

30A, 1200 VAC are popular for use in traction drive auxiliary circuits and

similar applications. LA120X fuses are also suitable for use on 1000VDC

auxiliary circuits with low time constants.

Features

• 1000 Volt DC rating for a wide range of circuits.

• Compact size fits in where competitive sizes will not fit.

Applications

Protection of traction drive auxiliary circuits, etc.

Dimensions

In Inches (mm in parentheses)

Ordering Information

Specifications

Voltage Rating: AC: 1200 Volts

DC: 1000 Volts

Interrupting Rating: 100,000 Amperes

Ampere Range: 1⁄2 – 30 Amperes

Note: Mounting type 1 can use 109002 and 129002 clips.

4 5/8

(117)

.812

(20.6)

Special Purpose Fuses

102 www.littelfuse.com

Special Purpose Fuses

LA 070 URD 31 LI 350

Class

Littelfuse

Size

Mounting Type

Voltage

(070=700V

130 =1300V)

Amp Rating

Straight-blade KI LI

Straight-blade LI LLI

Flat-type, one hole TTI TTI

700V 1300V

Square Body Semiconductor Fuses

700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes

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 SCR’s, diodes,

thyristors, GTO’s, 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.

• Superior cycling ability for long, reliable life on high cyclic loading.

• Extremely fast acting and current-limiting for improved protection to

equipment.

Applications

Protection of rectifiers, inverters, DC drives, UPS systems, reduced

voltage motor starters, and other equipment in globally accepted

applications.

Specifications

Voltage Rating: AC: 700 Volts (LA070)

1300 Volts (LA130)

DC: Contact factory

Interrupting Rating: AC: 200,000 Amperes (LA070)

100,000 Amperes (LA130)

DC: Contact factory

Ampere Range: 40 – 2500 Amperes

Approvals: UL Recognized Component

Ordering Information

Special Purpose Fuses

103

www.littelfuse.com

Special Purpose Fuses

700 Volt North American Style Ratings and Application Data

Body Size Amp

Rating

Rated

Voltage

Melting I2t

(A2S x 103)

Total I2t

@ Rated

Voltage

(A2S x 103)

**Watts

Loss @ Rated

Current

(W)

Long Blade

Catalog No.

Type LI

Short Blade

Catalog No.

Type KI

Tapped Terminal

Catalog No.

Type TTI

63 700 0.2 1.2 14 LA070URD30LI0063 LA070URD30KI0063 LA070URD30TTI0063

80 700 0.33 1.9 19 LA070URD30LI0080 LA070URD30KI0080 LA070URD30TTI0080

100 700 0.47 2.7 26 LA070URD30LI0100 LA070URD30KI0100 LA070URD30TTI0100

125 700 0.85 4.9 30 LA070URD30LI0125 LA070URD30KI0125 LA070URD30TTI0125

160 700 1.6 9.2 37 LA070URD30LI0160 LA070URD30KI0160 LA070URD30TTI0160

200 700 3 16.7 42 ⁄ 43 LA070URD30LI0200 LA070URD30KI0200 LA070URD30TTI0200

30 250 700 5.8 32.4 48 ⁄ 50 LA070URD30LI0250 LA070URD30KI0250 LA070URD30TTI0250

315 700 12 67 53 ⁄ 55 LA070URD30LI0315 LA070URD30KI0315 LA070URD30TTI0315

350 700 15.5 86 57 ⁄ 60 LA070URD30LI0350 LA070URD30KI0350 LA070URD30TTI0350

400 700 23 130 60 ⁄ 65 LA070URD30LI0400 LA070URD30KI0400 LA070URD30TTI0400

450 700 26 165 80 ⁄ 88 LA070URD30LI0450 LA070URD30KI0450 LA070URD30TTI0450

500 700 41 264 80 ⁄ 88 LA070URD30LI0500 LA070URD30KI0500 LA070URD30TTI0500

550 700 52 330 80 ⁄ 90 LA070URD30LI0550 LA070URD30KI0550 LA070URD30TTI0550

200 700 2.5 14.6 45 LA070URD31LI0200 LA070URD31KI0200 LA070URD31TTI0200

250 700 4.7 27 52 LA070URD31LI0250 LA070URD31KI0250 LA070URD31TTI0250

315 700 7.5 43 65 LA070URD31LI0315 LA070URD31KI0315 LA070URD31TTI0315

350 700 10.5 59 67 LA070URD31LI0350 LA070URD31KI0350 LA070URD31TTI0350

400 700 19 110 68 LA070URD31LI0400 LA070URD31KI0400 LA070URD31TTI0400

31 450 700 26.5 150 70 LA070URD31LI0450 LA070URD31KI0450 LA070URD31TTI0450

500 700 37 210 70 ⁄ 72 LA070URD31LI0500 LA070URD31KI0500 LA070URD31TTI0500

550 700 52 300 70 ⁄ 75 LA070URD31LI0550 LA070URD31KI0550 LA070URD31TTI0550

630 700 75 421 75 ⁄ 85 LA070URD31LI0630 LA070URD31KI0630 LA070URD31TTI0630

700 700 95 530 85 ⁄ 95 LA070URD31LI0700 LA070URD31KI0700 LA070URD31TTI0700

800 700 140 880 105 ⁄ 120 LA070URD31LI0800 LA070URD31KI0800 LA070URD31TTI0800

400 700 15 86 72 ⁄ 75 LA070URD32LI0400 LA070URD32KI0400 LA070URD32TTI0400

450 700 22 124 77 ⁄ 80 LA070URD32LI0450 LA070URD32KI0450 LA070URD32TTI0450

500 700 28 157 85 ⁄ 90 LA070URD32LI0500 LA070URD32KI0500 LA070URD32TTI0500

550 700 37 211 90 ⁄ 95 LA070URD32LI0550 LA070URD32KI0550 LA070URD32TTI0550

630 700 54 302 95 ⁄ 105 LA070URD32LI0630 LA070URD32KI0630 LA070URD32TTI0630

700 700 76 432 100 ⁄ 110 LA070URD32LI0700 LA070URD32KI0700 LA070URD32TTI0700

32 800 700 115 648 110 ⁄ 120 LA070URD32LI0800 LA070URD32KI0800 LA070URD32TTI0800

900 700 170 972 110 ⁄ 125 LA070URD32LI0900 LA070URD32KI0900 LA070URD32TTI0900

1000 700 240 1350 115 ⁄ 135 LA070URD32LI1000 LA070URD32KI1000 LA070URD32TTI1000

1100 650 270 1620 140 ⁄ 165 LA065URD32LI1100 – LA065URD32TTI1100

1250 600 410 2100 150 ⁄ 180 LA060URD32LI1250 – LA060URD32TTI1250

1400 550 555 2600 160 ⁄ 190 LA055URD32LI1400 – LA055URD32TTI1400

1600 550 870 4000 165 ⁄ 195 LA055URD32LI1600 – LA055URD32TTI1600

1800 500 1050 4400 195 ⁄ 330 LA050URD32LI1800 – LA050URD32TTI1800

500 700 19 108 105 LA070URD33LI0500 LA070URD33KI0500 LA070URD33TTI0500

550 700 27 151 105 ⁄ 110 LA070URD33LI0550 LA070URD33KI0550 LA070URD33TTI0550

630 700 40 227 110 ⁄ 120 LA070URD33LI0630 LA070URD33KI0630 LA070URD33TTI0630

700 700 55 324 115 ⁄ 125 LA070URD33LI0700 LA070URD33KI0700 LA070URD33TTI0700

800 700 95 529 120 ⁄ 130 LA070URD33LI0800 LA070URD33KI0800 LA070URD33TTI0800

900 700 135 760 120 ⁄ 135 LA070URD33LI0900 LA070URD33KI0900 LA070URD33TTI0900

1000 700 170 970 135 ⁄ 155 LA070URD33LI1000 LA070URD33KI1000 LA070URD33TTI1000

33 1100 700 240 1360 135 ⁄ 160 LA070URD33LI1100 LA070URD33KI1100 LA070URD33TTI1100

1250 700 350 2000 150 ⁄ 180 LA070URD33LI1250 LA070URD33KI1250 LA070URD33TTI1250

1400 700 480 2700 160 ⁄ 200 LA070URD33LI1400 LA070URD33KI1400 LA070URD33TTI1400

1600 650 555 3250 210 ⁄ 240 LA065URD33LI1600 – LA065URD33TTI1600

1800 650 720 4330 225 ⁄ 260 LA065URD33LI1800 – LA065URD33TTI1800

2000 600 950 5000 250 ⁄ 290 LA060URD33LI2000 – LA060URD33TTI2000

2250 550 1250 5900 280 ⁄ 330 LA050URD33LI2250 – LA055URD33TTI2250

2500 500 1870 7600 280 ⁄ 330 LA050URD33LI2500 – 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.

Square Body Semiconductor Fuses

700/1300 VAC • Very Fast-Acting • 40 – 2500 Amperes

Special Purpose Fuses

104 www.littelfuse.com

Special Purpose Fuses

Square Body Semiconductor Fuses

700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes

1.93 MAX

[49]

[50.6]

.26

[6.7]

North American Straight Blade, Type KI

Dimensions - 700V Fuses Dimensions for reference only.

Catalog Number Dimensions in Inches (mm in parentheses)

ABCDEFGHJ

LA070URD30KI (63-550) 1.57

(40)

0.98

(25)

0.49

(12.5)

0.83

(21)

0.71

(18)

2.68

(68)

4.21

(107)

5.08

(129)

0.41

(10.5)

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)

4.22

(107.1)

5.07

(128.8)

0.56

(14.3)

LA070URD32KI (400-1000) 2.36

(60)

1.26

(32)

0.63

(16)

1.18

(30)

1.06

(27)

2.92

(74.2)

4.29

(109)

5.28

(134)

0.57

(14.6)

LA070URD33KI (500-1400) 2.93

(74.5)

1.57

(40)

0.79

(20)

1.46

(37.2)

1.35

(34.2)

2.97

(75.4)

4.24

(107.6)

5.28

(134)

0.63

(15.9)

North American Straight Blade Types LI

Dimensions - 700V Fuses Dimensions for reference only.

Catalog Number Dimensions in Inches (mm in parentheses)

ABCDEFGHJ

LA070URD30LI (63-550) 1.57

(40)

0.98

(25)

0.49

(12.5)

0.83

(21)

0.71

(18)

3.45

(87.6)

4.98

(126.6)

5.85

(148.6)

0.41

(10.5)

LA070URD31LI (200-800) 2.01

(51)

0.98

(25)

0.49

(12.5)

1.0

(25.5)

0.89

(22.5)

3.61

(91.6)

4.82

(122.4)

5.85

(148.6)

0.57

(14.6)

LA070URD32LI (400-1000)

LA065URD32LI (1250)

LA055URD32LI (1400-1600)

LA050URD32LI (1800)

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)

LA070URD33LI (500-1400)

LA065URD33LI (1600-1800)

LA060URD33LI (2000)

LA055URD33LI (2250)

LA050URD33LI (2500)

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)

North American Flat Single Hole, Type TTI

Dimensions - 700V Fuses Dimensions for reference only.)

Catalog Number Dimensions in Inches (mm in parentheses)

AB C

LA070URD30TTI (100-550) 1.57

(40)

1.00

(25)

5⁄16-18 x 0.35

LA070URD31TTI (200-800) 2.00

(50.8)

1.19

(30.2)

5⁄16-18 x 0.35

LA070URD32TTI (400-1000)

LA065URD32TTI (1100)

LA060URD32TTI (1250)

LA055URD32TTI (1400-1600)

2.37

(60.3)

1.50

(38.1)

3⁄8-16 x 0.35

LA060URD33TTI (1800)

LA070URD33TTI (500-1400)

LA065URD33TTI (1600)

LA060URD33TTI (2000)

LA055URD33TTI (2250)

LA050URD33TTI (2500)

2.94

(74.5)

1.81

(46)

1⁄2-18 x 0.35

TYPE TTI

TYPES KI AND LI

1.925 MAX

[47.6]

.24

[6]

Special Purpose Fuses

105

www.littelfuse.com

Special Purpose Fuses

Square Body Semiconductor Fuses

700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes

1300 Volt North American Style Ratings and Application Data

Body

Size Amp Rating Rated Voltage Melting I2t

(A2S x 103)

Total I2t @

Rated Voltage

(A2S x 103)

**Watts Loss @

Rated Current (W)

Long Blade

Catalog No. Type LI/LLI

Tapped Terminal

Catalog No. Type TTI

63 1300 0.21 1.8 26 LA130URD70LI0063 LA130URD70TTI0063

80 1300 0.47 4 27 LA130URD70LI0080 LA130URD70TTI0080

100 1300 0.83 7.2 30 LA130URD70LI0100 LA130URD70TTI0100

125 1300 1.3 11 38 LA130URD70LI0125 LA130URD70TTI0125

160 1300 2.5 22 45 LA130URD70LI0160 LA130URD70TTI0160

200 1300 4.7 40 54 ⁄ 56 LA130URD70LI0200 LA130URD70TTI0200

250 1300 9.6 82 58 ⁄ 61 LA130URD70LI0250 LA130URD70TTI0250

315 1300 20 172 66 ⁄ 72 LA130URD70LI0315 LA130URD70TTI0315

350 1200 28 205 68 ⁄ 75 LA120URD70LI0350 LA120URD70TTI0350

160 1300 2.6 22 46 LA130URD71IL0160 LA130URDT1TTI0160

200 1300 4.7 40 54 LA130URD71LLI0200 LA130URD71TTI0200

250 1300 8.9 76 61 LA130URD71LLI0250 LA130URD71TTI0250

280 1300 12 102 68 ⁄ 70 LA130URD71IL0280 LA130URD71TTI0280

315 1300 16 138 73 ⁄ 76 LA130URD71LLI0315 LA130URD71TTI0315

350 1300 22 190 76 ⁄ 80 LA130URD71LLI0350 LA130URD71TTI0350

400 1300 38 330 76 ⁄ 80 LA130URD71LLI0400 LA130URD71TTI0400

450 1300 47 405 87 ⁄ 95 LA130URD71LLI0450 LA130URD71TTI0450

500 1200 68 500 90 ⁄ 100 LA120URD71LLI0500 LA120URD71TTI0500

550 1200 84 620 98 ⁄ 112 LA120URD71LLI0550 LA120URD71TTI0550

630 1100 125 930 105 LA110URD71LLI0630 –

630 1200 125 930 120 – LA120URD71TTI0630

280 1300 10 90 72 LA130URD72LI0280 LA130URD72TTI0280

315 1300 15 130 76 LA130URD72LI0315 LA130URD72TTI0315

350 1300 21 180 77 LA130URD72LI0350 LA130URD72TTI0350

400 1300 32 285 80 LA130URD72LI0400 LA130URD72TTI0400

450 1300 44 380 87 ⁄ 89 LA130URD72LI0450 LA130URD72TTI0450

500 1300 57 500 94 ⁄ 98 LA130URD72LI0500 LA130URD72TTI0500

550 1300 68 590 110 ⁄ 120 LA130URD72LI0550 LA130URD72TTI0550

630 1200 105 920 113 LA120URD72LI0630 –

630 1300 105 920 125 – LA130URD72TTI0630

700 1100 145 1040 122 LA110URD72LI0700 -

700 1200 145 1040 140 – LA120URD72TTI0700

800 1100 215 1590 125 LA110URD72LI0800 –

800 1200 215 1590 146 – LA120URD72TTI0800

315 1300 12 102 84 LA130URD73LI0315 LA130URD73TTI0315

350 1300 17 150 86 LA130URD73LI0350 LA130URD73TTI0350

400 1300 25 220 93 LA130URD73LI0400 LA130URD73TTI0400

450 1300 35 310 99 ⁄ 100 LA130URD73LI0450 LA130URD73TTI0450

500 1300 44 390 110 ⁄ 112 LA130URD73LI0500 LA130URD73TTI0500

550 1300 57 500 116 ⁄ 120 LA130URD73LI0550 LA130URD73TTI0550

630 1300 84 730 125 ⁄ 132 LA130URD73LI0630 LA130URD73TTI0630

700 1300 110 960 135 ⁄ 146 LA130URD73LI0700 LA130URD73TTI0700

800 1200 190 1630 136 LA120URD73LI0800 –

800 1300 190 1630 148 – LA130URD73TTI0800

900 1100 250 2160 150 LA110URD73LI0900 –

900 1300 250 2160 170 – LA130URD73TTI0900

1000 1100 370 2430 152 ⁄ 174 LA100URD73LI1000 LA100URD73TTI1000

1100 1000 445 2580 168 ⁄ 208 LA100URD73LI1100 LA100URD73TTI1100

1250 1000 585 3480 186 ⁄ 200 LA100URD73LI1250 LA100URD73TTI1250

1400 900 755 3880 210 ⁄ 228 LA090URD73LI1400 LA090URD73TTI1400

1600 700 1430 5630 203 LA070URD73LI1600 LA070URD73TTI1600

1800 660 2040 7600 206 LA065URD73LI1800 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.

Special Purpose Fuses

106 www.littelfuse.com

Special Purpose Fuses

Square Body Semiconductor Fuses

700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes

2.85 MAX

[72.5]

2.91

[74]

0.2

[5.03]

North American Straight Blade, Types LI and LLI

Dimensions - 1300V Fuses Dimensions for reference only.

Catalog Number Dimensions In Inches (mm in parentheses)

ABCDEFGHJ

LA130URD70LI (63-315)

LA120URD70LI (350)

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)

LA130URD71LLI (160-450)

LA120URD71LLI (500-550)

LA110URD71LLI (630)

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)

LA130URD72LI (280-550)

LA120URD72LI (800)

LA110URD72LI (700-800)

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)

LA130URD73LI (315-700)

LA120URD73LI (800)

LA110URD73LI (900-1000)

LA090URD73LI (1400)

LA070URD73LI (1600)

LA065URD73LI (1800)

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 - 1300V Fuses Dimensions for reference only.

Catalog Number Dimensions in Inches (mm)

ABC

LA130URD70TTI (63-315)

LA120URD70TTI (350)

1.57

(40)

1.00

(26.4)

5⁄16-18 x 0.23 DP

LA130URD71TTI (160-450)

LA120URD71TTI (550-630)

2.01

(51)

1.19

(30.2)

5⁄16-18 x 0.36 DP

LA130URD72TTI (280-630)

LA120URD72TTI (700-800)

2.36

(60)

1.50

(38.1)

3⁄8-18 x 0.36 DP

LA130URD73TTI (315-900)

LA120URD73TTI (1000)

LA110URD73TTI (1250)

LA090URD73TTI (1400)

LA070URD73TTI (1600)

LA065URD73TTI (1800)

2.93

(74.5)

1.81

(46)

1⁄2-18 x 0.36 DP

TYPES LI AND LLI

TYPE TTI

2.85

[72.5]

0.2

[5.03]

Special Purpose Fuses

107

www.littelfuse.com

Special Purpose Fuses

Fork-Lift and Stud-Mounted Fuses

32 – 130 Volts DC • Fast Acting and Time-Delay

Part No. A B C

CCK 1-15A 2.810 2.204 0.510

CCK 20-30A 3.060 2.454 0.510

CCK 35-60A 3.629 0.750

CCK 70-120A 4.129 3.454 1.00

CCK 140-200A 4.362 3.579 1.00

CCK 225-300A 4.612 3.829 1.00

CCL 30-60A 3.060 2.454 0.51

CCL 80-120A 3.38 2.70 0.75

0.812"

1.00"

1.625"

3.18"

0.343

2.43"

CCK/CCL CBO

CNL/ CNN Limiter Fuses

Specifications

Voltage Ratings: CNL: 32 Volts DC

CNN: 48 Volts DC, 75 Volts AC

Interrupting Rating: 2,500 amperes

Ampere Range: 10 – 800 amperes

Maximum Torque: 90 Inch lbs.

Recommended Fuse Block

LFFB001

Ampere ratings

CNL 35 80 150 250 350

40 100 175 275 400

50 125 200 300 500

60 130 225 325

CNN 10 80 175 300 500

35 90 200 325 600

40 100 225 350 700

50 125 250 400 800

60 150 275

Example part number (series & amperage): CNN 700

CBO/ CCK/ CCL Lift-Truck Fuses

CBO fast acting, and CCK and CCL dual-element time-delay fuses are rec-

ommended for fork lift trucks and other similar battery operated equipment.

Specifications

Voltage Ratings: CBO: 32 Volts DC

CCK: 130 Volts DC (1-100A)

72 Volts DC (120-200A)

48 Volts DC (225-300A)

CCL: 125 Volts DC

Interrupting Rating: CBO, CCK & CCL: 10,000A

Ampere Range: 1 – 300 amperes

For operating characteristics contact factory

Ampere ratings

CBO 10 25 50 80

Fast Acting 12 30 60 100

15 35 70 125

20 40 75 150

CCK 1 25 60 120 200

Time-Delay 23070140225

10 35 75 150 250

15 40 80 160 300

20 50 100 175

CCL 30 40 60 100

Time-Delay 35 50 80 120

Example part number (series & amperage): CCK 150

CNL fast-acting and CNN very fast acting fuses are rec om mend ed for

use on battery operated lift trucks and other low voltage battery operated

equipment.

Special Purpose Fuses

108 www.littelfuse.com

Special Purpose Fuses

LFCL - 500 - C - 1

Terminal Material

Littelfuse

Cable Limiter

Type of

Termination

Conductor Size

(Aluminum or Copper)

Cable Limiters

600 Volts AC

Description Catalog Number

Type Termination Cable Size Cable Type

Cop per Aluminum

Cable to Cable

4/0 LFCL4/0C1 LFCL4/0A1

250MCM LFCL250C1 LFCL250A1

350MCM LFCL350C1 LFCL350A1

500MCM LFCL500C1 LFCL500A1

750MCM LFCL750C1 LFCL750A1

Cable to Offset

Bus

4/0 LFCL4/0C3 LFCL4/0A3

250MCM LFCL250C3 LFCL250A3

350MCM LFCL350C3 LFCL350A3

500MCM LFCL500C3 LFCL500A3

750MCM LFCL750C3 LFCL750A3

Straight Bus to

Offset Bus

4/0 LFCL4/0C5 –

250MCM LFCL250C5 –

350MCM LFCL350C5 –

500MCM LFCL500C5 –

750MCM LFCL750C5 –

Mole to Cable

4/0 LFCL4/0C6 LFCL4/0A6

250MCM LFCL250C6 LFCL250A6

350MCM LFCL350C6 LFCL350A6

500MCM LFCL500C6 LFCL500A6

750MCM LFCL750C6 LFCL750A6

Mole to Offset

Bus

4/0 LFCL4/0C8 –

250MCM LFCL250C8 –

350MCM LFCL350C8 –

500MCM LFCL500C8 –

750MCM LFCL750C8 –

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 con tain ing three or

more parallel conductors per phase. They may be installed on the line

side of the main service to provide short-circuit 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

Service entrance conductors

Between transformer or network bus and busway terminal boxes

Large feeders with three or more conductors per phase

Features

• Current-limiting characteristics provide pro tec tion to conductor

insulation and reduce damage when faults occur.

• Properly applied cable limiters may permit the use of equip ment with

reduced withstand ratings

• Wide variety of terminations and cable ratings permit use in almost

every situation.

Specifications

Voltage Rating: 600 volts AC

Interrupting Rating: 200,000 Amperes

Cable Size Range: 4⁄0 – 750MCM Copper or Aluminum

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

and C8.

Ordering Information

Special Purpose Fuses

109

www.littelfuse.com

Special Purpose Fuses

LGR/ LMF In-Line Fuses and LHR Holder

LGR Fuses

Fast Acting • 300 VAC

Used as in-line protection for

fluorescent fixtures, this fast

acting fuse is ideal for increasing

the safety and reliability of lighting

fixtures.

LMF Fuses

Time-Delay • 300 VAC

Perfect for use in lighting systems,

this 300 VAC time-delay fuse

is designed to handle ballast

transformer in-rush currents.

7/8"

3/4"

0.263"

0.423"

0.630"

LHR Fuse Holder

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. On a

277 volt system, a fault occurring

in an unfused fixture could take out

the entire branch circuit affecting

as many as 100 fixtures. This could

cause safety problems as well as

shut down operations.

By individually fusing fixtures, these

problems will be avoided. The

added benefits of this is the ability to quickly identify the problem fixture

and reduce the repair time.

Fuse holders are rated up to 10 amperes at 300 volts and are equipped

with 7" 18 AWG leads. Order part number LHR 000 for two leads, and

part number LHR 001 for one lead with the other terminal used for

insertion of 18 AWG ballast lead.

Keyhole Punch

Knock-out Hole

1.82"

0.610"

1.82"

0.610"

Specifications

Voltage Rating: 300 volts AC

Ampere Rating: LHR 000: 10A

LHR 001: 10A

Approvals: UL Recognized

Flammability Rating: 94VO

Example part number: LHR 000

Mounting Information

LHR 001/LHR 000 will fit keyhole punch or

0.875" knock-out hole. Anti-ro ta tion fea ture is

pro vid ed when used with key hole punch.

A “U-shaped” clip is avail able for panel mount-

ing (pack aged 10 clips per bag): Order part

number LHR OCA.

Specifications

Voltage Rating: 300 volts AC

Maximum In ter rupt ing Rating: 10,000A

Approvals: Standard 248-14,

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

Ampere Ratings

3⁄10 8⁄10 16⁄10 28⁄10 47

1⁄212358

6⁄10 11⁄421⁄232⁄10 61⁄410

Example part number (series & amperage): LMF 21⁄2

Specifications

Voltage Rating: 300 volts AC

Maximum Interrupting Rating: 10,000A

Approvals: Standard 248-14,

UL Listed (File No: E10480)

CSA Certified (File No: LR29862)

Ampere Ratings

1⁄216⁄10 36915

124710

11⁄221⁄25812

Example part number (series & amperage): LGR 11⁄2

2.25"

0.50"

Blocks and Holders

Fuse Blocks 111

Class H/K5 and R Fuse Blocks 112-116

Class J Fuse Blocks 117-119

Class T Fuse Blocks 120-123

Class G Fuse Blocks 124

Class CC/CD and Midget Fuse Blocks 125-126

Class CC and Midget Fuse Block Accessories 127

Fuse Block, Holders and Accessories 128-133

Semiconductor Fuse Blocks 134-136

POWR-BLOKS

™ Distribution/Splicer Blocks 137-144

In-Line Watertight Fuseholders 145-150

Blocks and Holders

111

www.littelfuse.com

Blocks and Holders

Fuse Blocks

General Information

Fuse Block Selection

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 sys tem voltage, fuse blocks are

selected to match the voltage rating of the fuse.

2. Determine the design short-circuit current

Available and/or design short-circuit current is an important

consideration when de ter min ing the class of fuse and fuse blocks to

use. If available short-circuit current cannot be determined, or if it will

vary with equip ment 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.

Class H fuse blocks will accept Class H or K5 fuses (which have an

interrupting rating of up to 50,000 amperes) and Class R fuses (which

have a 200,000 A.I.R.). To prevent the possibility of inserting a fuse

with the incorrect in ter rupt ing rating, the use of Class R fuse blocks is

recommended for use with Class R fuses. Use Class H fuse blocks with

Class H or K5 fuses. These fuse blocks are dimensionally the same, but

the Class R fuse blocks incorporate a rejection feature which allows only

Class R fuses to be inserted.

3. Determine the type and ampere rating of the fuse to be used

In addition to voltage and interrupting rating as discussed above, the

fuse ampere rating, opening characteristics (fast acting or time-delay)

and size are other important con sid er ations in fuse selection. Once the

fuse type is selected, the mating fuse block can be chosen. Fuse blocks

are available in 30, 60, 100, 200, 400 and 600 amp ratings, and may be

used with a fuse rated at the cor re spond ing 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.

4. Determine if NEC, CSA, UL, or other requirements

are applicable

If fuse blocks will be installed in equipment to be submitted for agency

approval, the requirements should be obtained from the approving

agency in advance of fuse and fuse block selection.

5. Select the type of wire termination

A choice of three types of wire termination is available:

a) Screw* — for use with spade lugs or ring terminals.

b) Screw with Pressure Plate* — for use with solid or stranded wire

without terminal. Recommended where vibration will be a factor.

c) Box Lug — the most durable. For use with all types of solid wire and

Class B and Class C stranded wire. Not for use with welding cable or

other rope-stranded conductors.

* 1/4” Quick Connect terminals rated for up to 20A are

available on the Midget and Class CC fuse blocks.

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. The option to gang individual fuse blocks

into long strips will be determined by the avail able space and by the

type of wire being used.

7. Determine if fuse clips need to be re in forced

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. Reinforced clips are standard on certain fuse blocks (see individual

product pages).

Ordering Information

The Littelfuse fuse block part number con sists of 6 or 7 components, as

shown below and in the individual fuse block data tables.

For all Class R, H, J, T and 15, 20

& 60A Class G Fuse Blocks

For all Class CC, Midget and 30A

Class G Fuse Blocks

Screw

with

Pressure

Plate

(P)

Screw

(S) Box

Lug

(C)

Blocks and Holders

112 www.littelfuse.com

Blocks and Holders

Class H/K5 and R Fuse Blocks

250 and 600 Volt

Class H 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum Wire

Size

Screw

Pres sure

Plate

Box

Lug

1 LH60030-1 S (R) P (R) C (R) S & P = #10 CU

30 2 LH60030-2 S (R) P (R) C (R) C = #6 CU-AL

3 LH60030-3 S (R) P (R) C (R)

1 LH60060-1 C (R) S = #10 CU

60 2 LH60060-2 C (R) C = #2 CU-AL

3LH60060-3 C (R)

1LH60100-1 C

100 2 LH60100-2 C #2/0 CU-AL

3LH60100-3 C

1LH60200-1 C

200 3 LH60200-3 C 250 MCM CU-AL

1LH60400-1 CR

400 3 LH60400-3 CR (2) 350 MCM CU-AL

1LH60600-1 C

600 3 LH60600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class H fuse blocks 100 amperes and above.

Class H 250V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum Wire

Size

Screw

Pres sure

Plate

Box

Lug

1 LH25030-1 S (R) P (R) C (R) S & P = #10 CU

30 2 LH25030-2 S (R) P (R) C (R) C = #6 CU-AL

3 LH25030-3 S (R) P (R) C (R)

1 LH25060-1 S (R) C (R) S = #10 CU

60 2 LH25060-2 S (R) C (R) C = #2 CU-AL

3 LH25060-3 S (R) C (R)

1LH25100-1 C

100 2 LH25100-2 C #2/0 CU-AL

3 LH25100-3 C

1 LH25200-1 C

200 3 LH25200-3 C 250 MCM CU-AL

1LH25400-1 CR

400 3 LH25400-3 CR (2) 350 MCM CU-AL

1 LH25600-1 C

600 3 LH25600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class H fuseblocks 100 amperes and above.

Class R 250V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum Wire

Size

Screw

Pres sure

Plate

Box

Lug

1 LR25030-1 SR PR CR S & P = #10 CU

30 2 LR25030-2 SR PR CR C = #6 CU-AL

3 LR25030-3 SR PR CR

1 LR25060-1 CR S = #10 CU

60 2 LR25060-2 CR C = #2 CU-AL

3LR25060-3 CR

1LR25100-1 C

100 2 LR25100-2 C #2/0 CU-AL

3LR25100-3 C

1 LR25200-1 C

200 3 LR25200-3 C 250 MCM CU-AL

1LR25400-1 CR

400 3 LR25400-3 CR (2) 350 MCM CU-AL

1 LR25600-1 C

600 3 LR25600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class R fuse blocks.

Class R 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum Wire

Size

Screw

Pres sure

Plate

Box

Lug

1 LR60030-1 SR PR CR S & P = #10 CU

30 2 LR60030-2 SR PR CR C = #6 CU-AL

3LR60030-3SR PR CR

1 LR60060-1 CR S = #10 CU

60 2 LR60060-2 CR C = #2 CU-AL

3LR60060-3 CR

1LR60100-1 C

100 2 LR60100-2 C #2/0 CU-AL

3LR60100-3 C

1LR60200-1 C

200 3 LR60200-3 C 250 MCM CU-AL

1LR60400-1 CR

400 3 LR60400-3 CR (2) 350 MCM CU-AL

1LR60600-1 C

600 3 LR60600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class R fuse blocks.

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.

Features/Benefits

• Class H and Class R fuse blocks feature clip designs to maximize

electrical contact and minimize heat rise.

• Reinforcing clips are standard on all Class H fuse blocks rated 100

amp and higher. Note: For reinforcing clips on Class H blocks rated 30-60

amp, add “R” suffix to connector type.

• Reinforcing clips are standard on all Class R fuse blocks

Specifications

Voltage Rating: 250 Volts; 600 Volts

Ampere Ratings: 0 – 600 amperes

Approvals: UL Listed (File No. E14721)

CSA Certified (File No. LR73091)

Recommended Fuses

Note: For optional fuse block covers, refer to POWR-Covers section of this catalog.

Class H Blocks Class R Blocks

250V 600V 250V 600V

NLN NLS FLNR/FLNR_ID FLSR/FLSR_ID

RLN RLS KLNR KLSR

LLNRK LLSRK/LLSRK_ID

TLN IDSR

Blocks and Holders

113

www.littelfuse.com

Blocks and Holders

.28 (7.1) THRU

.53 (13.5) C'BORE x .60 (15.2) DP

6.13

.61

.63

1.56

TYP. 1.56

TYP. FUSE q

2.37

1.88

.187 HEX

SOCKET

3 POLE 2 POLE 1 POLE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

3.49

[88.6] 1.93

[49.0]

5.05

[128.3]

2.44

[62.0]

Class H/K5 and R Fuse Blocks

250 Volt

3.00"

[76.2]

.50"

[13]

1.25"

[31.8]

.22/5.6 DIA. HOLE THRU

4 PLACES

.75"

[19]

1.25"

[31.7]

1.12"

[28.4]

1.91"

[48.5]

2.95"

[74.9]

2.50"

[63.5]

.22"

[5.7]

.33"

[8.4]

.19"

[4.8]

1.38"

[35.1]

.53"

[13]

1.50"

[38.1] 1.50"

[38.1]

1 POLE 2 POLE 3 POLE

2.01"

[51.1]

.74"

[19]

4.23"

[108]

.50"

[12.7]

.49

[12] 1.33"

[33.7]

4.83"

[122.7]

1.33"

[33.7]

1.24"

[31.5]

1.79"

[45.6]

2.86"

[72.7]

.50"

[12.7]

.49"

[12]

4.83"

[122.7]

1.33"

[33.7]

1.24"

[31.5]

1.79"

[45.6]

1.48"

[37.6]

.50"

[12.7]

4.83"

[122.7]

.49"

[12]

1.24"

[31.5]

1.79"

[45.6]

.218/[5.54] DIA.

C'BORE .400/[10.16] DIA. X .63[16] DP

1 POLE 2 POLE 3 POLE

250V 30A

250V 60A

250V 100A

Blocks and Holders

114 www.littelfuse.com

Blocks and Holders

[355.6]

[279.4]

[19]

[111]

4.37"

4.50"

[317.5]

[114.3]

14.00"

.75"

5.00"

12.50"

[127]

11.00"

[355.6]

4.50"

[114.3]

14.00"

4.50"

[114.3]

5.00"

[127]

1 POLE 3 POLE

10.50"

3.31"

9.25"

[235] [84]

[266.7]

3.75"

[292.1]

11.50"

[95.3]

3.75

[292.1]

11.50"

4.00"

[101.6] 4.00"

[101.6]

[95.2]

3.50"

[88.9]

1 POLE 3 POLE

Class H/K5 and R Fuse Blocks

250 Volt

.66"

2.00"

9.00"

.50"

[229]

[52.3]

2.06"

3.01"

1.06"

[76.5]

[102]

4.00"

[16.8]

[26.9]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

3.00"

[76.2]

3.00"

[76.2]

[52.3]

2.06"

.312" HEX.

7.13"

[181.1]

7.13"

[181.1]

[50.8]

[13]

1 POLE 3 POLE

250V 400A

250V 200A

250V 600A

Blocks and Holders

115

www.littelfuse.com

Blocks and Holders

8.13 .87

.61 1.81

TYP.

4.26

1.93

3 POLE

.187 HEX

SOCKET

.28 (7.1) DIA. THRU

.59 (14.9) C'BORE x .64 (16.2) DP.

TYP.

2 POLE 1 POLE

2.10

[53.3]

3.91

[99.3]

5.73

[145.5]

2.60

[66.0]

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

Class H/K5 and R Fuse Blocks

600 Volt

6.25"

[159]

6.25"

[159]

6.25"

[159]

1.69"

[42.9]

1.63"

[41.4]

2.94"

[74.7]

4.25"

[108]

3.13"

[79.2]

.62"

[16]

1.56"

[39.6]

3.13"

[79.4]

3.13"

[79.4]

3.13"

[79.4]

.34"

[8.7]

.31"

[7.9]

.38"

[97]

.25"

[6.5]

.69"

[18]

.265" [6.7] DIA. THRU

.05" [12.7] C'BORE

x .44 [11.2] DP.

1 POLE 2 POLE 3 POLE

3.51"

[89.2]

.77"

[19.6]

.27"

[6.8]

.66"

[19.6]

.62"

[15.7]

3.12"

[79.2]

6.75"

[171.4]

1.95"

[49.5]

.281" D.

[7.1]

.50" D.

[12.7]

1.81"

[46]

1.29"

[32.8]

1.56"

[39.6]

1.56"

[39.6]

5.08"

[1.29]

3.12"

[79.2]

3.12"

[79.2]

2.12"

[53.8]

1 POLE 2 POLE 3 POLE

600V 30A

600V 60A

600V 100A

Blocks and Holders

116 www.littelfuse.com

Blocks and Holders

10.50"

3.31"

9.25"

[235] [84.1]

[266.7][57.2]

3.75"

7.00"

[177.8]

[95.3]

2.25"

3.75

[368.3]

14.50"

[368.3]

14.50"

7.00"

[177.8]

[95.3]

3.50 "

[88.9]

1 POLE 3 POLE

[431.8]

[279.4]

[19] [109.5]

4.31"

4.50"

[317.5]

[114]

17.00"

.75"

8.00"

12.50"

[203]

11.00"

[431.8]

4.50"

[114]

17.00"

4.50"

[114.3]

8.00"

[203]

[76.2 ]

3.00"

1 POLE 3 POLE

.66"

2.00"

9.00"

.50"

[229]

[84.1]

3.31"

3.00"

[76.2]

3.01"

1.06"

[76.5]

[102]

4.00"

[244]

[16.8]

[26.0]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

[84.1]

3.31"

3.00"

[76.2]

.312" HEX.

9.62" 9.62"

[244]

[50.8]

[13]

1 POLE 3 POLE

Class H/K5 and R Fuse Blocks

600 Volt

600V 200A

600V 400A

600V 600A

Blocks and Holders

117

www.littelfuse.com

Blocks and Holders

Class J Fuse Blocks

600 Volt

1.16"

[29.4]

.30"

TYP.

[7.6]



1.69"

[42.8]

3.38"

[85.7]

.57"

[14.5]

.71"

[17.9]

1.95"

[49.5]

.216[5.5] x .79[20.0] SLOT

MOUNTING HOLE

1.69"

[42.8]

3.38"

[85.7]

.57

[14.5]

" TYP.

2.20"

[56.0]

1.04"

[26.4]

1.69"

[42.8]

3.38"

[85.7]

3.25"

[82.5]

1.04"

[26.4]

1 POLE 2 POLE 3 POLE



Class J 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum

Wire Size

Screw

Pres sure

Plate

Box

Lug

1 LJ60030-1 S (R) P (R) C (R)

S & P = #10 CU

C = #6 CU

2 LJ60030-2 S (R) P (R) C (R)

3 LJ60030-3 S (R) P (R) C (R)

Adder LJ60030-A S (R) P (R) C (R)

1LJ60060-1 C (R)

C = #2 CU-AL2LJ60060-2 C (R)

3LJ60060-3 C (R)

100 1LJ60100-1 CR #2/0 CU-AL

3LJ60100-3 CR

200 1LJ60200-1 C 250 MCM CU-AL

3LJ60200-3 C

400 1LJ60400-1 CR

(2) 350 MCM CU-AL

3LJ60400-3 CR

600 1LJ60600-1 CR

(2) 500 MCM CU-AL

3LJ60600-3 CR

Note: Reinforcing springs standard on all Class J fuse blocks rated 100A and above.

*For optional fuse block covers, refer to POWR-Covers section of this catalog. For

reinforcing clips on blocks rated 30-60 amp, add “R” suffix to connector type.

Features/Benefits

• Phenolic blocks have side barriers for isolation.

• Spring reinforced fuse clips are standard on 100A and larger blocks.

Reinforcing springs are optional on 30 and 60 amp blocks.

• Space saving 30A design — Up to 45% smaller than existing

30A fuse blocks. 30A interlocking adder block available to create

any number of poles (consult factory for availability). Integral DIN rail

mount allows this block to be securely fastened to 35 mm “hat” type

DIN rails without the use of tools.

Specifications

Voltage Ratings: 600 Volts

Ampere Ratings: 0 – 600 amperes

Approvals: UL Listed: File No. E14721

CSA Certified: File No. LR73091

Recommended Fuses

JTD_ID/JTD (time-delay) and JLS (fast acting) series fuses

LJ60030

Blocks and Holders

118 www.littelfuse.com

Blocks and Holders

Class J Fuse Blocks

600 Volt

1.53"

[38.8]

1.53"

[38.8]

1.53"

[38.8]

.76"

[19]

.76"

[19]

.76"

[19]

.45"

[12]

.45"

[12] .45"

[12]

.57"

[14 ]

2.03"

[51.7]

.265" x .325" SLOT

[6.7 x 8.3] TYP.

1 POLE 2 POLE 3 POLE

4.07"

[103]

2.03"

[51.7]

4.07"

[103]

4.07"

[103]

2.03"

[51.7]

2.09"

[53.0]

4.72"

[120]

3.20"

[81.2]

1.67"

[42.4]

LJ60060

.50"

2.00"

3.00"

1.31"

.62"

2.67"

6.13"

.34" THRU

.75" C'BORE

x .400" DP.

[33.39]

[76.2]

[8.6]

[19.1]

[10.2]

[156]

[13]

[50.8] [67.9]

[16]

1 POLE 3 POLE

LJ60100

LJ60200

1 POLE 3 POLE

Blocks and Holders

119

www.littelfuse.com

Blocks and Holders

Class J Fuse Blocks

600 Volt

1 POLE

1 POLE 3 POLE

LJ60400

3 POLE

LJ60600

Blocks and Holders

120 www.littelfuse.com

Blocks and Holders

Class T Fuse Blocks

300 and 600 Volt

.31"

[7.9]

2.88"

[73.0]

2.25"

[57.2]

1.19"

[30.2]

1.13"

[28.6]

0.62"

[15.9]

3.50"

[88.9]

1.12"

[28.5]

1.13"

[28.6]

0.218" [5.54] THRU

0.39" [9.91] C'BORE

x 0.44" [9.91] DP.

2.88

[73.0]

2.25

[57.2]

1.19

[30.2]

1.13

[28.6]

2.38

[60.3]

.31

[7.9]

2 POLE 3 POLE

LT30030

Class T 300V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum

Wire Size

Screw Box Lug

30 2 LT30030-2 CR S = #10 CU

3 LT30030-3 CR C = #2 CU

2LT30060-2 CR

C = #2 CU-AL3LT30060-3 CR

4LT30060-4 CR

100

1LT30100-1 C

#2⁄0 CU-AL2LT30100-2 C

3LT30100-3 C

200 1 LT30200-1 C 250 MCM CU-AL

400 1 LT30400-1 C (2) 250 MCM CU-AL

600 1 LT30600-1 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all 300 volt Class T fuse blocks up to 100

amperes. 300 volt Class T blocks 200 amperes and larger have stud mountings.

Class T 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Max i mum

Wire Size

Screw Box Lug

1 LT60030-1 SR CR S = #10 CU

2 LT60030-2 SR CR C = #2 CU-AL

3LT60030-3SRCR

1LT60060-1 CR

C = #2 CU-AL2LT60060-2 CR

3LT60060-3 CR

100

1LT60100-1 C

#2⁄0 CU-AL2LT60100-2 C

3LT60100-3 C

200 1 LT60200-1 C 250 MCM CU-AL

400 1 LT60400-1 C (2) 250 MCM CU-AL

600 1 LT60600-1 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all 600 volt Class T fuse blocks up to 60

amperes. 600 volt Class T blocks 100 amperes and larger have stud mountings.

Features/Benefits

Bases are molded phenolic. To provide a low resistance connection and

long-range re li abil i ty, steel re in forc ing springs are supplied as standard.

Larger blocks employ an in te gral heat sink for maximum heat dissipation.

Specifications

Voltage Ratings: 300 Volts AC

600 Volts AC

Ampere Ratings: 0 – 600 amperes

Approvals: UL Listed (File No. E14721)

CSA Certified (File No. LR73091)

Recommended Fuses

JLLN (300V) and JLLS (600V) series fuses

300 and 600 volt fuse blocks are designed for use with miniaturized Class T

fuses. Class T fuses are very fast acting, current-limiting, and approximately

one-third the size of electrically comparable Class RK1 fuses.

Blocks and Holders

121

www.littelfuse.com

Blocks and Holders

.31"

[7.9]

2.88"

[73.0]

2.25"

[57.2]

1.19"

[30.2]

1.13"

[28.6]

0.62"

[15.9]

3.50"

[88.9]

1.28"

[32.5]

1.13"

[28.6]

0.20"

[5.2]

1.20"

[30.6]

2.06"

52.4]

0.44"

[11.1]

3.09"

[78.6]

4.47"

[113.5]

0.218" [5.54] THRU

0.39" [9.91] C'BORE

x 0.44" [9.91] DP.

2.88

[73.0]

2.25

[57.2]

1.19

[30.2]

1.13

[28.6]

2.38

[60.3]

0.31

[7.9]

2 POLE 3 POLE 4 POLE

4.50"

[114.3]

5.25"

[133.3]

3.09"

[78.6]

1.56"

[39.6]

1.37

[34.8]

.203" [5.1]

DIA.HOLE

0.69"

[17.5]

.37" [9.5]

C'BORE

4.78"

[121.4]

2.39"

[60.7]

0.18"

[4.6]

1.87"

[47.5]

1 POLE 2 POLE

1.41"

[35.7]

4.50"

[114.3]

5.25"

[133.3]

4.12"

[104.6]

2.75"

[69.8]

0.69"

[17.5]

3 POLE

6.25"

[158.7]

7.00"

[177.8]

1.69"

[42.9]

1.50"

[38.1]

.281" [7.1]

DIA.HOLE

.69"

[17.5]

.50" [12.7]

C'BORE

1 POLE

.18"

[4.6]

2.25"

[57.1]

1 POLE

8.12"

[206.2]

7.37"

[187.3]

1.12"

[28.6]

1.84"

[46.7]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.25"

[57.1]

0.19"

[48]

2.37"

[60.2]

0.62"

[15.7]

1 POLE

8.75"

[222.2]

8.06"

[203.2]

2.03"

[51.6]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.75"

[69.8]

0.37"

[9.5]

0.19"

[4.8]

2.62"

[66.5]

0.62"

[15.7]

Class T Fuse Blocks

300 Volt

LT30060

LT30100

LT30200 LT30400 LT30600

Blocks and Holders

122 www.littelfuse.com

Blocks and Holders

5.31"

[134.9]

[153.9]

2.36"

[6.0]

1.37

[34.8]

0.203" [5.1]

DIA.HOLE

0.69"

[17.5]

0.37" [9.5]

C'BORE

5.31"

[134.9]

2.39"

[60.7]

4.78"

[121.4]

6.06"

[153.9]

3.09'"

[78.6]

1.41"

[35.7]

4.12"

[104.6]

2.75"

[69.8]

0.69"

[17.5]

0.18"

[4.6]

1.87"

[47.5]

1 POLE 3 POLE

2 POLE

6.06'

3.13"

[79.4]

1.56"

[39.7]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

2 POLE1 POLE

1.81"

[46.0]

2.31"

[58.7]

0.91"

[23.0]

0.63"

[16]

1.74"

[44.2]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

4.69"

[119]

1.56"

[39.7]

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

3 POLE

3.13"

[79.4]

0.91"

[23.0]

0.33"

[8.3]

1.44"

[36.5]

0.33"

[8.3]

0.55"

[13.9]

1.56"

[39.7]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

4.69"

[119]

1.56"

[39.7]

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

2 POLE1 POLE 3 POLE

0.62"

[15.9]

1.28"

[32.5]

3.19"

[81.0]

Class T Fuse Blocks

600 Volt

LT60030

LT60060

LT60100

Blocks and Holders

123

www.littelfuse.com

Blocks and Holders

7.0"

[177.8]

7.75"

[196.8]

2.50"

[63.5]

1.50"

[38.1]

0.281" [7.1]

DIA.HOLE

0.75"

[19.0]

0.50" [12.7]

C'BORE

1 POLE

.18"

[4.6]

2.25"

[57.1]

9.00"

[228.6]

8.25"

[209.5]

1.12"

[28.6]

2.72"

[69.1]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.25"

[57.1]

0.19"

[4.8]

2.37"

[60.2]0.62"

[15.7]

1 POLE

9.75"

[247.6]

9.0"

[228.6]

2.95"

[75.0]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.75"

[69.8]

0.37"

[9.5]

0.19"

[4.8]

2.62"

[66.5] 0.62"

[15.7]

1 POLE

Class T Fuse Blocks

600 Volt

LT60200 LT60400

LT60600

Blocks and Holders

124 www.littelfuse.com

Blocks and Holders

Class G Fuse Blocks

Specifications

Voltage Ratings: 600 Volts AC (0 – 20A)

480 Volts AC (25 – 60A)

Ampere Ratings: 0 – 60 amperes

Approvals: UL Listed: 15, 20 & 30A (File No. E14721)

60A (File No. E14853)

CSA Certified: 15, 20 & 30A (File No. LR7316)

60A (File No. LR47235)

Recommended Fuses

SLC series fuses

0.36"

[9.13]

0.86"

[21.83] 1.675"

[42.55]

2.375"

[60.33]

0.22"

[5.56]

3.0"

[76.2]

1.53"

[38.89]

0.42"

[10.72]

0.77"

[19.45]

0.42"

[10.72]

MOUNTING

SLOTS

0.17" X 0.22"

[4.37 x 5.56]

1 POLE 2 POLE

3 POLE

Note: Refer to the Midget/Class CC Fuse Blocks for L30030G 30A Class G Block dimensions.

Class G fuse blocks are designed for use with 480 volt time-delay,

current-limiting Class G fuses. They meet requirements for branch

circuit protection.

Amp

Rating

No. of

Poles

Cat a log

Number

Connector Type

(Add Suffix Shown) Max i mum

Wire Size

Screw Pres sure

Plate

Box

Lug

15*

1LG30015-1SQ

#10 CU2LG30015-2SQ

3LG30015-3SQ

20*

1LG30020-1SQ

#10 CU2LG30020-2SQ

3LG30020-3SQ

30*

1L30030G-1SQ PQ

#10 CU2L30030G-2SQ PQ

3L30030G-3SQ PQ

1LG30060-1 CR

#2 CU-AL2LG30060-2 CR

3LG30060-3 CR

* Note: 15, 20 & 30A Class G fuse blocks are equipped with 20A Quick Connect

Terminals. 60A fuse block equipped with reinforcing spring as standard.

LG30015 &

LG30020

LG30060

Blocks and Holders

125

www.littelfuse.com

Blocks and Holders

Class CC/CD and Midget Fuse Blocks

600 Volt

Space saving 600 volt, 30 amp molded case fuse blocks with side

barriers for isolation. Class CC blocks and Midget blocks are identical

except Class CC blocks incorporate a rejection feature to assure proper

fusing.

Safety

• Rejection feature — Class CC fuse blocks have a rejection feature

which prevents the insertion of fuses with lower interrupting rating

or voltage ratings. Class CC fuses are rated 600 volts and have an

interrupting rating of 200,000 amperes. Midget fuse voltage ratings

vary and their interrupting rating may be as low as 10,000 amperes.

Note that Class CC fuses may be used in Midget fuse blocks, but Midget

fuses cannot be used in Class CC blocks.

Long life

• High-strength materials — Class CC and Midget fuse blocks are

molded of high-strength, high-temperature material to min i mize

block breakage during handling and installation, as well as damage

caused by overheating.

• Reduced resistance, less heat — High con duc tiv i ty, one-piece copper

alloy fuse clips have lower resistance than traditional two-piece brass

or phosphor bronze fuse clips, which minimizes heat rise and watts

loss within the fuse block.

Reduced inventory

• Gangable — Interlocking fuse blocks allow ganging to produce a fuse

block with any number of poles.

• Flexible terminal arrangements — 30A Class CC and Midget fuse

blocks are available with type C box lug, type SQ screw, or type

PQ pressure plate terminals. Type SQ ter mi nals have binding-head

screws, while type PQ terminals have captive pressure plates. Both

terminal types can ac com mo date side or top mounted quick-connect

ter mi nals. This flexibility allows the ac com mo da tion of most needs

and reduces part inventory requirements.

• 60A CD fuse blocks are available with type C box lug terminals.

• DIN rail mountable — FBDIN1 adapters permit snap-mounting

Littelfuse Class CC and Midget 30 amp fuse blocks directly to

standard or low profile 35mm sym met ri cal “hat” and 32mm

asymmetrical DIN rails. Patented DIN rail adapters snap securely to

Littelfuse fuse blocks and to DIN rails without tools. They can be

readily removed from rails by lifting the disconnect tab.

• L60060C 60A fuse blocks have patented integral DIN rail adapters

which allow direct mounting to 35mm “hat” type DIN rails.

Specifications

Voltage Rating: 600 Volts AC/600 Volts DC

Ampere ratings: L60030C: 30 amps

L60030M: 30 amps

L60060C: 60 amps

Dielectric strength: 1200 volts minimum

Clip/terminals: Tin-plated copper alloy

Box lug: Copper

Screw and captive pressure plate: Zinc-plated steel

Base: Thermoplastic. UL 94VO flammability rating.

Approvals: Class CC: UL Listed (File No. E14721)

Midget: UL Recognized (File No. E14721)

Class CC/Midget: CSA Certified (File No. LR7316)

Recommended Fuses

Class CC Blocks:

CCMR KLDR KLKR

Midget Blocks:

BLF BLS FLM FLU KLKD LA60Q-2

BLN FLA FLQ KLK KLQ

Class CD Blocks:

CCMR

Note: L60030M can be used up to 40A.

Blocks and Holders

126 www.littelfuse.com

Blocks and Holders

1.89"

[48.0]

3.35"

[85.09]

3.35"

[85.09]

3.35"

[85.09]

1.01"

[25.65]

1 POLE 2 POLE 3 POLE ADDER

0.783"

[19.89]

3.0"

[76.2]

1.533"

[38.15]

2.283"

[57.15]

1.25"

[31.75]

1 POLE 2 POLE 3 POLE

3.12"

[79.25]

1.01"

[25.65]

1.01"

[25.65]

2.12"

[53.85]

3.0"

[76.2]

3.0"

[76.2]

3.35"

[85.09]

Class CC/CD and Midget Fuse Blocks

600 Volt

Class CC 30A Fuse Blocks

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown)

Maximum

Wire Size

1 L60030C-1C

30 2 L60030C-2C Box Lug #6 CU

3 L60030C-3C

1 L60030C-1PQ

30 2 L60030C-2PQ Pres sure Plate/ #10 CU

3 L60030C-3PQ Q. C. Terminal

1 L60030C-1SQ

30 2 L60030C-2SQ Screw/ Q. C. Terminal #10 CU

3L60030C-3SQ

Note: Quick Connect Terminals are rated at 20 amperes.

Class CD 60A Fuse Blocks

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown)

Maximum

Wire Size

1L60060C-1C

60 2 L60060C-2C Box Lug #6 CU

3L60060C-3C

60 Adder

Block L60060C-AC Box Lug #6 CU

Midget Fuse Blocks

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown)

Maximum

Wire Size

1L60030M-1C

30 2 L60030M-2C Box Lug #6 CU

3L60030M-3C

1L60030M-1PQ

30 2 L60030M-2PQ Pres sure Plate/ #10 CU

3L60030M-3PQ Q. C. Terminal

1L60030M-1SQ

30 2 L60030M-2SQ Screw/ Q. C. Terminal #10 CU

3 L60030M-3SQ

Note: Quick Con nect Terminals are rated at 20 amperes.

L60030

L60060

Blocks and Holders

127

www.littelfuse.com

Blocks and Holders

DIN Rail Adapter — FBDIN1

FBDIN1 is for use with 30A Midget, Class CC and Class G fuse blocks.

The patented design permits snap-mounting of Littelfuse Class CC and

Midget 30A fuse blocks directly to standard and low profile 35mm sym-

met ri cal “hat” and 32mm asymmetrical DIN rails. Adapt ers snap securely

to Littelfuse fuse blocks and to DIN rails with out tools. They may be

readily re moved from rails by lifting the disconnect tab.

Class CC and Midget Fuse Block Accessories

DIN Rail Adapters and Cover Pullers

Cover Puller — SPL001

Littelfuse Class CC and Midget fuse cover puller is designed to provide

protection to personnel, as well as make removal of fuses from fuse

blocks easy and safe. Once in stalled on the fuse, the cover puller allows

removal of the fuse without the use of a separate puller.

• Meets “Dead Front” requirements for use in control panels.

• Permits safe, easy removal.

• Works with existing fuse block. No special hinged fuse blocks are required.

• Easily gangable with 1/8" diameter wire.

• For use with all 600 volt Class CC and Midg et 1/10 — 30A fuses.

• Use with Class CC L60030C series and L60030M series fuse blocks.

• Label provided for easy fuse identification.

• For 2-pole cover puller, order DSPL001.

0.484"

0.670"

1.360"

0.750" 1.490"

0.576" 0.770"

DIN 35

Standard Rail DIN 35

Low Profile DIN 32

Standard Rail

1.22"

0.665"

3.0"

Blocks and Holders

128 www.littelfuse.com

Blocks and Holders

Fuse Blocks, Holders and Accessories

POWR-SAFE “Dead Front” Holders

Specifications

Voltage Rating: 600 Volts AC/DC

Ampere Rating: 30 amperes

Interrupting Rating: 200 kA (Class CC)

100 kA (Midget)

Terminal type: Pressure plate

Suggested Torque: 15 lb.

Wire Range: #6—#14CU

Material: Thermo-Plastic

Flammability Rating: 94VO

Approvals: UL Listed (LPSC File No: E14721)

UL Recognized (LPSM File No: E14721)

CSA Certified (LPSC/LPSM File No: LR7316)

IEC Type IP20 Protection

CE Certified

Indicating

Part Num ber

Non-Indicating

Part Num ber Fuse Type Number of Poles

LPSC001ID LPSC001 Class CC 1

LPSC002ID LPSC002 Class CC 2

LPSC003ID LPSC003 Class CC 3

LPSC004ID LPSC004 Class CC 4

LPSM001ID LPSM001 Midget 1

LPSM002ID LPSM002 Midget 2

LPSM003ID LPSM003 Midget 3

LPSM004ID LPSM004 Midget 4

Multi-pole Assembly Kit: Order No: CYHP001

(Kit contains 20 connector pincers and 10 handle pins.)

NOTE: Contact factory for DC rated versions.

3.032

(77.01)

.689

(17.50) 1.38

(35.05)

2.07

(52.58)

2.76

(70.10)

Features/benefits

• Meets “Dead Front” requirements and IEC Type IP20 Protection

• Mountable on 35mm Din Rail

• Blown fuse identification (Indicating versions only)

• Easy installation and removal of fuses. No special fuse pullers or tools

required.

• UL Listed for branch circuit protection (Class CC versions only)

• Compact design

• Ventilated design for cooler operation

• Indicates above 80 volts (ID versions only)

Ordering information

Littelfuse POWR-SAFE “Dead Front” holders provide optimum

protection to personnel. Indicating and non-indicating versions are

available in 1, 2, 3, or 4 poles for Class CC and Midget fuses.

Dimensions in inches (mm in parentheses)

• LPSM/LPSC POWR-SAFE Holders

Blocks and Holders

129

www.littelfuse.com

Blocks and Holders

Littelfuse

Catalog No.

Littelfuse

System No.

No. of

Poles

Pack

Qty.

Voltage

Rating

Ampere

Rating

Options

LPSJ30-1 LPSJ301.Z 1 6 600V 30A –

LPSJ30-2 LPSJ302.Z 2 3 600V 30A –

LPSJ30-3 LPSJ303.Z 3 2 600V 30A –

LPSJ30-1ID LPSJ301.ZXID 1 6 600V 30A Indicating

LPSJ30-2ID LPSJ302.ZXID 2 3 600V 30A Indicating

LPSJ30-3ID LPSJ303.ZXID 3 2 600V 30A Indicating

LPSJ60-1 LPSJ601.Z 1 6 600V 60A –

LPSJ60-2 LPSJ602.Z 2 3 600V 60A –

LPSJ60-3 LPSJ603.Z 3 2 600V 60A –

LPSJ60-1ID LPSJ601.ZXID 1 6 600V 60A Indicating

LPSJ60-2ID LPSJ602.ZXID 2 3 600V 60A Indicating

LPSJ60-3ID LPSJ603.ZXID 3 2 600V 60A Indicating

Fuse Blocks, Holders and Accessories

Class J POWR-SAFE Holders

Specifications

Voltage Rating: 600 VAC

Interrupting Rating: 200 kA

Ampere Rating: 30 and 60 amperes

Terminal Type: Pressure plate

Suggested Torque: 30A – 35 inch-pounds

60A – 45 inch-pounds

Wire Range: #2 – #14CU

Material: Thermo-plastic

Flammability Rating: 94V0

Approvals: UL Listed

CSA Certified

IEC Type IP20 Protection

Littelfuse POWR-SAFE “Dead Front” fuseholders provide optimum

protection to personnel. An integral DIN-Rail adapter system allows fuse

holders to be mounted on 35mm DIN-Rail without the use of tools or

special parts. Indicating and non-indicating versions are available in 1, 2,

or 3 poles for Class J fuses.

Dimensions in inches (mm in parentheses)

30 Amp

Features/benefits

• Meets “Dead Front” requirements and IEC Type IP20 protection.

• Mountable on 35mm DIN-Rail.

• Blown fuse identification (Indicating versions only).

• Easy installation and removal of fuses. No special fuse pullers or tools

required.

• UL listed for branch circuit protection.

• Ventilated design for cooler operation.

Ordering Information

60 Amp

Multi-Pole Assembly Kit: Order No: US3J2PAK to assemble two LPSJ30-1

US3J3PAK to assemble three LPSJ30-1

US6J2PAK to assemble two LPSJ60-1

US6J3PAK to assemble three LPSJ60-1

Blocks and Holders

130 www.littelfuse.com

Blocks and Holders

Fuse Blocks, Holders and Accessories

POWR-Covers - Fuse Block Covers

Littelfuse fuse block covers protect personnel from ac ci den tal ly

contacting energized contacts. Covers are available for Class H, R, J,

and CD type fuses up to 100 amps.

Features/benefits

• Meets “Dead Front” requirements and IEC Type IP20 Protection for

most applications (see note)

• Easily gangable with optional “gang-slide” adapters

• Added safety to personnel

• Unique design allows Littelfuse Indicator® fuses to be seen through

covers

• Ventilated to avoid fuse derating

• Covers are reusable

• Covers fit most competitor blocks

• LJ60100-3PC is a three pole clear plastic cover

For “Gang Slide” Adapters order:

PCGS-2 for 2 poles

PCGS-3 for 3 poles

NOTE: Contact Factory for specific applications.

Ordering information

Littelfuse Part

Number

For Use With Fuse

Block Number Voltage Amp Fuse

Class

LH25030-PC LH25030/LR25030 series 250 30 H/R

LH25060-PC LH25060/LR25060 series 250 60 H/R

LH25100-PC LH25100/LR25100 series 250 100 H/R

LH60030-PC LH60030/LR60030 series 600 30 H/R

LH60060-PC LH60060/LR60060 series 600 60 H/R

LH60100-PC LH60100/LR60100 series 600 100 H/R

LJ60030-PC LJ60030 series only 600 30 J

LJ60060-PC LJ60060 series only 600 60 J

LJ60100-PC* LJ60100-1CR only 600 100 J

LJ60100-3PC LJ60100-3CR only 600 100 J

L60060C-PC L60060C series only 600 60 CD

*Note: For use with Class J fuses with 1” diameter, Littelfuse series JLS.

Specifications

Voltage Rating: 600 Volts

Ampere Rating: Class H: 0-100 amps

Class R: 0-100 amps

Class J: 0-100 amps

Class CD: 0-60 amps

Material: Thermoplastic

Approvals: UL Listed (File No: E184929)

CSA Certified (File No: LR7316)

Blocks and Holders

131

www.littelfuse.com

Blocks and Holders

Fuse Pullers

Littelfuse ergonomically designed fuse pullers are the safe way of

handling power fuses. They offer greater ease in removing fuses. This

new molded design is superior to standard pullers because it offers

a more comfortable and natural grip when pulling fuses, improving

performance. Part No. LPFP

Part Number & Application

Midget Fuse Puller MFP: For

3/16" to 1/2" dia. fuses.

Pocket Fuse Puller LPFP: For 0 – 200A 250V,

0 – 100A 600V

(

9/16" – 119/32" dia. fuses)

Giant Fuse Puller GFP: 61 – 600A 250V,

61 – 400A 600V

1/16" – 219/32" dia. fuses)

Tri-Puller 097023: For ATO® and glass fuses.

Fuse Blocks, Holders and Accessories

Part Number Volts Amperes

LCC 1 250 0-30

LCC 2 250 35-60

LCC 2 600 0-30

LCC 4 600 35-60

LCC 5 250/600 70-100

LCC 6 250/600 110-200

LCC 7 250/600 225-400

LCC 8 250/600 450-600

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.

POWR-JAW Clip Clamps

POWR-JAW clamps improve the contact be tween fuse and clip. The

unnecessary heat from poor contact due to the loss of spring force in

the clips can cause nuisance fuse opening and premature aging of sur-

round ing components.

• High temperature phenolic resin knob de signed for the most severe

en vi ron ments.

• 7 sizes to provide effective coverage.

• Simple design makes installation easy.

Blocks and Holders

132 www.littelfuse.com

Blocks and Holders

Fuse Blocks, Holders and Accessories

571 Series Panel Mounted Fuseholders

Panel mount fuseholders are available for sup ple men ta ry or Class CC

branch circuit protection. Class CC fuses have a rejection feature on

one end cap which mates with the rejection feature of Littelfuse Class

CC fuse blocks and fuseholders to prevent the installation of fuses with

lower voltage ratings or interrupting ratings. Watertight version must be

front panel mounted.

0.86"

[21.84]

0.92"

[23.37] 0.890"

[22.6]

1.12"

[28.45]

1.310"

[33.3]

1.34"

[34.04]

2.10"

[53.34]

1.74"

[44.20]

1.312"

[33.33]

.172 DIA.

[4.37]

Mounting Hole

Part Number Bottom

Terminal

Fuse Length

Range*

For Use

With

Standard Watertight

571 027 571 027P Straight 15⁄16” – 13⁄8”Midget Fuses

571 028 571 028P Rt. Angle

571 007 571 007P Straight 113 ⁄32” – 11⁄2”Midget Fuses

571 008 571 008P Rt. Angle

571 OCC 571 OCCP Straight 11⁄2”Class CC Fuses

571 RCC 571 RCCP Rt. Angle

*Fuse diameter is 13/32”.

Note: Contact the factory for versions with pre-assembled wire leads.

O-Rings: 901-184 (body)

901-260 (knob)

Specifications

Voltage Rating: 600 Volts

Ampere Rating: 30 amperes for Class CC and

Midget fuses

Dielectric strength: 4000 Volts

Terminals : Tin-plated brass combination solder

and quick-connect

Molded parts: Black thermoplastic

Approvals: UL Recognized (File No. E14721) — 571 series

UL Recognized for branch circuit protection

— 571 OCC/RCC

CSA Certified (File No. LR7316)

Ordering Information

0.69”

2.10”

2.40”

1.20”

DIA

572 Series Panel Mounted Fuseholders

The 572 series panel mount fuse holders are designed to minimize

installation time. The unique design incorporates a snap-mount feature

that allows the holder to be installed without any tools or mounting

hardware.

NEW

Ordering Information

Part Number Bottom

Terminal

Fuse Length

Range* For Use With

Standard Watertight

572 027 572 027P Straight 15⁄16” – 13⁄8”Midget Fuses

572 028 572 028P Rt. Angle

572 007 572 007P Straight 113 ⁄32” – 11⁄2”Midget Fuses

572 008 572 008P Rt. Angle

572 OCC 572 OCCP Straight 11⁄2”Class CC Fuses

572 RCC 572 RCCP Rt. Angle

*Fuse diameter is 13/32”

Note: Contact the factory for versions with preassembled wire leads.

Specifications

Voltage Rating: 600 Volts

Ampere Rating: 30 Amperes for Class CC and Midget fuses

Dielectric Strength: 4000 Volts

Terminals : Tin-plated brass combination solder and quick-connect

Molder Parts: Black thermoplastic

Approvals: UL Recognized (File No. E14721) – 572 Series

UL Recognized for branch circuit

protection – 571 OCC/RCC

CSA Certified (File No. LR7316)

Mounting: Designed to fit 14-18 gauge panels with Double

”D” punch or 0.875” knock-out hole.

Blocks and Holders

133

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Blocks and Holders

LFFB Series Limiter Fuse Block

The Littelfuse LFFB fuse block is designed to accept CNL and CNN

style limiter fuses. Typical applications include: forklifts, golf carts, and

other low voltage battery-operated equipment.

Fuse Blocks, Holders and Accessories

LHFB Inline Fuse Holder

Specifications

Voltage Rating: 150 VAC/VDC

Ampere Range: 1 – 400 amperes

Approvals: Pending

Construction: Base — thermoplastic

Studs — steel zinc plated

Ordering Information

Example catalog number: LFFB001

Example system number: LFFB0001Z

Dimensions

The Littelfuse LHFB waterproof inline fuse holder is ideal for harsh

environments. The easy to assemble one-piece molded thermoplastic

body is a bright green color for high visibility. The LHFB holder accepts

#12 to #18 gauge wire and features the voltage and ampere rating

molded into the body, along with a wire strip gauge. Withstands

solvents and vibration, for use with 1/4” x 11/4” fuses.

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.

*Recommended crimping tools: Thomas & Betts No. WT-111M

NOTE: Wire is not supplied with the holder.

Specifications

Voltage Rating: 32 Volts

Ampere Rating: 30 amperes

Recommended fuses

Littelfuse CNL/CNN limiter fuses and competitors’ equivalents.

Blocks and Holders

134 www.littelfuse.com

Blocks and Holders

Semiconductor Fuse Blocks

LSCR001

LSCR002

1.88"

1.30"

0.70"

0.203" × 0.30" SL

0.50" 1/4-20" × 1.00"

USABLE LENGTH

2.38"

1.34"

0.25"

2.13"

1.60"

1.00"

0.75"

0.50"

0.203" × 0.30" SLO

3/8-16"x1.00"

USABLE LENGTH

0.25"

0.50"

3.44"

2.44"

Modular-designed Semiconductor fuse blocks are designed to

accommodate a wide range of Semiconductor fuses, with a max i-

mum diameter of 3". This modular design greatly reduces inventory

requirements. They are sold in pairs and are constructed of molded

phenolic, with plated steel studs.

Recommended Fuses

Semiconductor fuses. See tables below.

Specifications

Voltage rating: LSCR001: Accepts fuses 1” diameter or less at 600V.

Also accepts

13 ⁄16" diameter fuses at 700 — 1000V.

LSCR002: Accepts fuses up to 3" diameter at 1000V.

Ampere ratings: LSCR001: 1 – 400 ampere capacity.

LSCR002: 70 – 800 ampere capacity.

Approvals: UL Recognized (File No. E14721)

Stud Size: LSCR001:

1⁄4 - 20 thread (Torque: 65 In. LBS.)

LSCR002:

3⁄8 - 16 thread (Torque: 192 In. LBS.)

Base: Molded phenolic. 150° C temperature rating.

Terminal construction: Plated steel. Supplied with nut and belleville washer.

LSCR001

Semiconductor fuse block selection guide

Fuse Series Ampere Rating

L15S 70 – 400

L25S, LA30QS 35 – 60

L25S 70 – 200

L50S, LA50QS 35 – 60

L50S, LA50QS 70 – 100

L50S 125 – 200

L60S 35 – 60

L60S 70 – 100

L60S 125 – 200

L70S, LA70QS 35 – 60

L70S, LA70QS 70 – 100

KLC 1 – 30

KLC 35 – 60

LA100P 35 – 60

LSCR002

Semiconductor fuse block se lec tion guide

Fuse Series Ampere Rating

L15S, LA15QS 500 – 800

L25S, LA30QS 225 – 700

L25S, LA30QS 800

L50S, LA50QS 225 – 400

L50S, LA50QS 450 – 600

L50S, LA50QS 700 – 800

L60S 225 – 400

L60S 450 – 600

L60S 700 – 800

L70S, LA70QS 125 – 200

L70S, LA70QS 225 – 400

L70S, LA70QS 450 – 800

KLC 70 – 100

KLC 125 – 200

KLC 225 – 400

KLC 450 – 800

LA100P 70 – 800

JLLN 700 – 1200

Blocks and Holders

135

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Blocks and Holders

Semiconductor Fuse Blocks

Littelfuse 1LS series modular style semiconductor fuse blocks

accommodate a wide range of semiconductor fuses. Blocks are

provided in pairs with fuse mounting hardware.

• 2-piece modular design

• General purpose phenolic base

• Tin plated aluminum box lugs

• Dove-tailed interlocking feature (1LS101 only)

• Hex-head bolts and belleville washers provided

Littelfuse

Catalog No.

Ampere

Rating Wire Range Torque Rating Approvals

1LS101 100A #2/0 - 14 CU/AL 120 IN. LBS. UL Recognized

1LS102 400A 250MCM - #6 CU/AL 275 IN. LBS. UL Recognized

1LS103 400A 250MCM - #6 CU/AL 275 IN. LBS. UL Recognized

1LS104 600A 500MCM - #6 CU/AL 375 IN. LBS. UL Recognized

1LS108 400A 250MCM - #6 CU/AL 275 IN. LBS. Self-Certified

1LS109 400A 250MCM - #6 CU/AL 275 IN. LBS. Self-Certified

1LS110 400A 250MCM - #6 CU/AL 275 IN. LBS. Self-Certified

1LS101 1LS102

Dimensions for reference only.

Ordering Information

Dimensions

Specifications

Voltage Rating: 600 Volts

Ampere Range: 1 – 600 amperes

Approvals: UL Recognized under the components program

Insulator Base: 150° C general purpose phenolic

Box Lug Terminal: Tin plated aluminum

Blocks and Holders

136 www.littelfuse.com

Blocks and Holders

Semiconductor Fuse Blocks

Dimensions

1LS103 1LS104

1LS108

1LS109

1LS110

Blocks and Holders

137

www.littelfuse.com

Blocks and Holders

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

POWR-BLOKS 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.

Applications

Typical applications include heating, air conditioning and refrigeration

systems, el e va tor systems, material handling equipment, control

panels, motor controls, switchgear, and anywhere power needs to be

distributed to more than one load.

Connectors

Box lug connectors are designed for use with a single, solid or class

B or C stranded conductor. Use of more than one con ductor 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 ter minations 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 310.16. 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.

Ordering Information

Note: Aluminum blocks can use copper or aluminum wire; copper blocks can

only use copper wire.

Specifications

Voltage Rating: 600V

Amperage: Based on NEC Table 310.16,

using 75°C copper wire

Material: Phenolic rated at 150°C and Thermoplastic rated at

125°C (LD1400 and LS1300 series only)

Connector: Standard: Highly con duc tive aluminum, tin plated

Copper: Highly conductive copper, tin plated

Flammability Rating: 94V-0

Approvals: UL Recognized (File No. E171395)

CSA Certified (File No. LR700111)

Distribution Block

Example Part No.

Splicer Block

Example Part No.

Blocks and Holders

138 www.littelfuse.com

Blocks and Holders

Littelfuse 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. Clear plastic covers are

available for most blocks. New Lx2xxx-xDIN series blocks offer a hinged

cover. To order protective covers, match the number of poles for the

block to the cover.

Distribution Block Covers

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Clear Plastic Covers

Littelfuse

Part Number

For use with

Distribution/Splicer Block No.

Number

of Poles

LPBC0-2 LD0xxx-2 / LS0xxx-2 2

LPBC0-3 LD0xxx-3 / LS0xxx-3 3

LPBC2-1 LD2xxx-1 / LS2xxx-1 1

LPBC2-2 LD2xxx-2 / LS2xxx-2 2

LPBC2-3 LD2xxx-3 / LS2xxx-3 3

LPBC3-1 LD3xxx-1 / LS3xxx-1 1

LPBC3-2 LD3xxx-2 / LS3xxx-2 2

LPBC3-3 LD3xxx-3 / LS3xxx-3 3

LPBC4-1 LD4xxx-1 / LS4xxx-1 1

LPBC4-2 LD4xxx-2 / LS4xxx-2 2

LPBC4-3 LD4xxx-3 / LS4xxx-3 3

LPBC5-1 LD5xxx-1 / LS5xxx-1 1

LPBC5-2 LD5xxx-2 / LS5xxx-2 2

LPBC5-3 LD5xxx-3 / LS5xxx-3 3

Note: For installation of optional clear plastic covers, use the screws provided with

each cover.

Hinged Plastic Covers

Littelfuse

Part Number

For use with

Distribution/Splicer Block No.

Number

of Poles

LCH132-1 LD2xxx-1DIN / LS2xxx-1DIN 1

LCH132-2 LD2xxx-2DIN / LS2xxx-2DIN 2

LCH132-3 LD2xxx-3DIN / LS2xxx-3DIN 3

Note: Optional hinged covers snap on to blocks.

Blocks and Holders

139

www.littelfuse.com

Blocks and Holders

Distribution Block Selection Guide

Connector

Configuration Amp

Rating

per Pole

Number

of Poles

Line Load

Figure

Littelfuse

Catalog

Number

Mat’l Line Load Wire Range Openings

per Pole Wire Range Openings

per Pole

115 1 #2 - #14 1 #10 - #18 4 2 LD1400-1

115 2 #2 - #14 1 #10 - #18 4 2 LD1400-2

115 3 #2 - #14 1 #10 - #18 4 2 LD1400-3

115 4 #2 - #14 1 #10 - #18 4 2 LD1400-4

175 2 2⁄ 0 - #14 1 #4 - #14 6 1 LD0401-2

175 3 2⁄ 0 - #14 1 #4 - #14 6 1 LD0401-3

175 2 2⁄ 0 - #14 1 #4 - #14 4 1 LD0402-2

175 3 2⁄ 0 - #14 1 #4 - #14 4 1 LD0402-3

310 2 350mcm - #6 1 #4 - #14 6 1 LD0404-2

310 3 350mcm - #6 1 #4 - #14 6 1 LD0404-3

175 1 2⁄ 0 - #14 1 #4 - #14 4 3 LD2570-1

175 2 2⁄ 0 - #14 1 #4 - #14 4 3 LD2570-2

175 3 2⁄ 0 - #14 1 #4 - #14 4 3 LD2570-3

175 1 2⁄ 0 - #14 1 #4 - #14 4 3 LD2970-1

175 2 2⁄ 0 - #14 1 #4 - #14 4 3 LD2970-2

175 3 2⁄ 0 - #14 1 #4 - #14 4 3 LD2970-3

335 1 400mcm - #6 1 #2 - #14 4 5 LD3552-1

335 2 400mcm - #6 1 #2 - #14 4 5 LD3552-2

335 3 400mcm - #6 1 #2 - #14 4 5 LD3552-3

335 1 400mcm - #6 1 #2 - #14 6 5 LD3553-1

335 2 400mcm - #6 1 #2 - #14 6 5 LD3553-2

335 3 400mcm - #6 1 #2 - #14 6 5 LD3553-3

350 1 2⁄ 0 - #14 2 #4 - #14 6 5 LD3555-1

350 2 2⁄0 - #14 2 #4 - #14 6 5 LD3555-2

350 3 2⁄ 0 - #14 2 #4 - #14 6 5 LD3555-3

380 1 500mcm - #4 1 #2 - #14 6 5 LD3953-1

380 2 500mcm - #4 1 #2 - #14 6 5 LD3953-2

380 3 500mcm - #4 1 #2 - #14 6 5 LD3953-3

350 1 2⁄ 0 - #14 2 #4 - #14 6 5 LD3955-1

350 2 2⁄ 0 - #14 2 #4 - #14 6 5 LD3955-2

350 3 2⁄ 0 - #14 2 #4 - #14 6 5 LD3955-3

380 1 500mcm - #4 1 #2 - #14 6 6 LD4551-1

380 2 500mcm - #4 1 #2 - #14 6 6 LD4551-2

380 3 500mcm - #4 1 #2 - #14 6 6 LD4551-3

335 1 400mcm - #6 1 #2 - #14 8 6 LD4560-1

335 2 400mcm - #6 1 #2 - #14 8 6 LD4560-2

335 3 400mcm - #6 1 #2 - #14 8 6 LD4560-3

380 1 500mcm - #4 1 #2 - #14 12 7 LD5552-1

380 2 500mcm - #4 1 #2 - #14 12 7 LD5552-2

380 3 500mcm - #4 1 #2 - #14 12 7 LD5552-3

380 1 500mcm - #4 1 2⁄0 - #14 6 7 LD5579-1

380 2 500mcm - #4 1 2⁄0 - #14 6 7 LD5579-2

380 3 500mcm - #4 1 2⁄0 - #14 6 7 LD5579-3

760 1 500mcm - #4 2 2⁄0 - #14 8 7 LD5586-1

760 2 500mcm - #4 2 2⁄0 - #14 8 7 LD5586-2

760 3 500mcm - #4 2 2⁄0 - #14 8 7 LD5586-3

665 1 500mcm - #4 1 2⁄0 - #14 4 7 LD5587-1

350mcm - #6 1

665 2 500mcm - #4 1 2⁄0 - #14 4 7 LD5587-2

350mcm - #6 1

665 3 500mcm - #4 1 2⁄0 - #14 4 7 LD5587-3

350mcm - #6 1

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Blocks and Holders

140 www.littelfuse.com

Blocks and Holders

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Distribution Block Selection Guide

Connector Configuration Amp

Rating

per Pole

Number

of Poles

Line Load

Figure

Littelfuse

Catalog

Number

Mat’l Line Load Wire Range Openings

per Pole Wire Range Openings

per Pole

760 1 500mcm-#4 2 #4 - #14 12 7 LD5592-1

760 2 500mcm-#4 2 #4 - #14 12 7 LD5592-2

760 3 500mcm-#4 2 #4 - #14 12 7 LD5592-3

380 1 500mcm-#4 1 #2 - #14 8 7 LD5594-1

380 2 500mcm-#4 1 #2 - #14 8 7 LD5594-2

380 3 500mcm-#4 1 #2 - #14 8 7 LD5594-3

760 1 500mcm-#4 2 2⁄0 - #14 8 7 LD5986-1

760 2 500mcm-#4 2 2⁄0 - #14 8 7 LD5986-2

760 3 500mcm-#4 2 2⁄0 - #14 8 7 LD5986-3

760 1 500mcm-#4 2 #2 - #14 12 7 LD5992-1

760 2 500mcm-#4 2 #2 - #14 12 7 LD5992-2

760 3 500mcm-#4 2 #2 - #14 12 7 LD5992-3

175 1 2⁄0 - #14 1 #4 - #14 4 4 LD2570-1DIN

175 2 2⁄0 - #14 1 #4 - #14 4 4 LD2570-2DIN

175 3 2⁄0 - #14 1 #4 - #14 4 4 LD2570-3DIN

175 Adder 2⁄ 0 - #14 1 #4 - #14 4 4 LD2570-ADIN

175 1 2⁄0 - #14 1 #4 - #14 6 4 LD2580-1DIN

175 2 2⁄0 - #14 1 #4 - #14 6 4 LD2580-2DIN

175 3 2⁄0 - #14 1 #4 - #14 6 4 LD2580-3DIN

175 Adder 2⁄ 0 - #14 1 #4 - #14 6 4 LD2580-ADIN

175 1 2⁄0 - #14 1 #4 - #14 4 4 LD2970-1DIN

175 2 2⁄0 - #14 1 #4 - #14 4 4 LD2970-2DIN

175 3 2⁄0 - #14 1 #4 - #14 4 4 LD2970-3DIN

175 Adder 2⁄ 0 - #14 1 #4 - #14 4 4 LD2970-ADIN

Blocks and Holders

141

www.littelfuse.com

Blocks and Holders

Splicer Block Selection Guide

Connector

Configuration Amp

Rating

per Pole

Number

of Poles

Line Load

Figure

Littelfuse

Catalog

Number

Mat’l Line Load Wire Range Openings

per Pole Wire Range Openings

per Pole

310 2 350mcm-#6 1 350mcm-#6 1 1 LS0303-2

310 3 350mcm-#6 1 350mcm-#6 1 1 LS0303-3

115 1 #2 - #14 1 #2 - #14 1 2 LS1300-1

115 2 #2 - #14 1 #2 - #14 1 2 LS1300-2

115 3 #2 - #14 1 #2 - #14 1 2 LS1300-3

115 4 #2 - #14 1 #2 - #14 1 2 LS1300-4

150 1 1⁄0 - #18 1 1⁄0 - #18 1 3 LS2121-1

150 2 1⁄0 - #18 1 1⁄0 - #18 1 3 LS2121-2

150 3 1⁄0 - #18 1 1⁄0 - #18 1 3 LS2121-3

115 1 #2 - #14 1 #2 - #14 1 3 LS2552-1

115 2 #2 - #14 1 #2 - #14 1 3 LS2552-2

115 3 #2 - #14 1 #2 - #14 1 3 LS2552-3

175 1 2⁄0 - #14 1 2⁄0 - #14 1 3 LS2572-1

175 2 2⁄0 - #14 1 2⁄0 - #14 1 3 LS2572-2

175 3 2⁄0 - #14 1 2⁄0 - #14 1 3 LS2572-3

255 1 250mcm-#6 1 250mcm-#6 1 5 LS3123-1

255 2 250mcm-#6 1 250mcm-#6 1 5 LS3123-2

255 3 250mcm-#6 1 250mcm-#6 1 5 LS3123-3

255 1 250mcm-#6 1 250mcm-#6 1 5 LS3124-1

255 2 250mcm-#6 1 250mcm-#6 1 5 LS3124-2

255 3 250mcm-#6 1 250mcm-#6 1 5 LS3124-3

310 1 350mcm-#6 1 350mcm-#6 1 5 LS3126-1

310 2 350mcm-#6 1 350mcm-#6 1 5 LS3126-2

310 3 350mcm-#6 1 350mcm-#6 1 5 LS3126-3

420 1 600mcm-#4 1 600mcm-#4 1 6 LS4557-1

420 2 600mcm-#4 1 600mcm-#4 1 6 LS4557-2

420 3 600mcm-#4 1 600mcm-#4 1 6 LS4557-3

620 1 350mcm-#4 2 350mcm-#4 2 7 LS5129-1

620 2 350mcm-#4 2 350mcm-#4 2 7 LS5129-2

620 3 350mcm-#4 2 350mcm-#4 2 7 LS5129-3

760 1 500mcm-#4 2 500mcm-#4 2 7 LS5301-1

760 2 500mcm-#4 2 500mcm-#4 2 7 LS5301-2

760 3 500mcm-#4 2 500mcm-#4 2 7 LS5301-3

175 1 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2572-1DIN

175 2 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2572-2DIN

175 3 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2572-3DIN

175 A 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2572-ADIN

175 1 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2972-1DIN

175 2 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2972-2DIN

175 3 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2972-3DIN

175 A 2⁄0 - #14 1 2⁄0 - #14 1 4 LS2972-ADIN

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Blocks and Holders

142 www.littelfuse.com

Blocks and Holders

1.00"

[25.4]

2.90"

[73.7]

.07"

[1.8] .07"

[1.8]

.218 x .375"

[5.5 x 9.5]SLOT

3.52"

[89.3]

4.13"

[104.8]

.65 x .375"

[6.7 x 9.5] SLOT

1.00"

[25.4]

2.90"

[73.7]

.218 x .375"

[5.5 x 9.5]SLOT

.265 x .375"

[6.7 x 9.5] SLOT

3.38"

[85.8] 4.73"

[121]

5.38"

[137]

4.63"

[118] 3.38"

[85.8]

2 POLE 3 POLE

2.88"

[73.0]

2.25"

[57.2]

.56"

[14]

1.94"

[49.2]

2.75"

[69.9]

1.62"

[42]

2.25"

[57.2]

2.88"

[73.0]

.63"

[16.1]

.56"

[14]

.205 [5.2]

DIA. HOLE

1.13"

[28.6]

.56"

[14]

.62"

[16] .62"

[16]

2.25"

[57.2]

2.88"

[73.0]

1.78"

[45.2]

1 POLE 2 POLE 3 POLE

.31"

[7.9]

LX0XXX

LX2XXX

Figure 1

Figure 3

1.52

[38.7]

1 POLE 2 POLE 4 POLE3 POLE

LX1XXX

Figure 2

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Blocks and Holders

143

www.littelfuse.com

Blocks and Holders

2.61"

[66.2]

1.94"

[49.3]

.97"

[25]

1.17"

[29.7]

.31"

[7.9] .31"

[7.9]

4.00"

[102]

3.38"

(85.7)

1.17"

[29.7]

.97"

(25)

3.47"

[88.1]

1.53"

[38.9]

4.00"

[102]

3.38"

(85.7)

4.00"

[101.6]

3.38"

[85.7]

.97"

[25]

5.00"

[127.0]

.31"

[7.9]

1.17"

[29.7]

1 POLE 2 POLE 3 POLE

1.53"

[38.9]

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

Figure 5

Figure 4

2.42

[61.5]

1 POLE 2 POLE

3 POLE ADDER

LX3XXX

LX2XXX-XDIN

Blocks and Holders

144 www.littelfuse.com

Blocks and Holders

POWR-BLOKS™

Distribution/Splicer Blocks and Covers

.31"

[7.9] .31"

[7.9]

.31"

[7.9]

2.28"

[57.9]

1.14"

[29.0]

4.75"

[121]

4.13"

[105]

1.14"

[29.0]

1.88"

[47.8]

4.16"

[106]

4.13"

[105]

4.75"

[121]

2.92

(74.0)

1.88"

[47.8]

6.04"

[153]

1.88"

[47.8]

1.14"

[29.0]

4.13"

[105]

4.75"

[121]

1 POLE 2 POLE 3 POLE

3.12"

[79.2]

.37"

(9.5)

.37"

[9.5]

.37"

[9.5]

5.50"

[140]

4.75"

[121]

1.58"

[40.2]

3.17"

[80.4]

4.75"

[121]

5.50"

[140]

1.58"

[40.2]

2.69"

[68.2]

5.88"

[149]

4.75"

[121]

5.50"

[140]

2.30"

[58.5]

8.54"

[217]

2.69"

[68.2]

1.58"

[40.2]

1 POLE 2 POLE 3 POLE

Figure 7

Figure 6

LX4XXX

LX5XXX

Blocks and Holders

145

www.littelfuse.com

Blocks and Holders

In-Line Watertight Fuseholders

LOAD

SOURCE

ELECTRICAL TAPE

Littelfuse 600 volt in-line watertight fuse holders are the ideal answer

for all high humidity and corrosive environments where fuses are

required. Available in both break away and non-break away, single and

double pole versions, these fuse hold ers allow maximum flexibility for

any ap pli ca tion.

Applications

Street, alley, and parking lot lighting

Security and perimeter lighting

Traffic signals

Outdoor illuminated signs

Sports lighting

Boat electrical circuits

Tractors and yard equipment

General outdoor circuit protection

Benefits

• Safety — Permits individual fixture or device to be dis con nect ed from

circuit for servicing. Eliminates possibility of shock.

• Individual fixture fusing — Prevents loss of one fixture through

accident, vandalism, or end of life from darkening the entire circuit.

• Simplifies maintenance — Being able to immediately identify the one

faulted fixture eliminates testing the entire circuit, speeds repair, and

allows the individual unit to be serviced while the rest of the circuit is

functioning.

• Reduces damage from fault — Can prevent faulted ballast or other

failure from severely damaging fixture or device, reducing necessary

repair or need of replacement.

Features

• Watertight — Internal O-ring provides watertight seal.

• Superior terminal seals — Ultrasonically-welded terminals provide

maximum strength and eliminate leaking at terminals.

• Break resistant — Fiberglass reinforced polymer body resists damage

from dropping or impact much better than phenolic look-alikes.

• Flexible terminations — Accommodates a wide range of stranded or

solid copper or aluminum conductors. Ter mi na tions are available for

one or two conductors, with either crimp or screw terminals.

• One-pole and two-pole models available to ac com mo date all system

voltages up to 600V.

Specifications

Voltage rating: 600 Volts

Ampere rating: 30 amperes

200,000 amperes rms symmetrical (with Class CC fuses)

Approvals:

LEB/ LEX series: UL Recognized Miscellaneous

Fuseholder per UL 512 (File No. E14721)

CSA Certified per C22.2, No. 39 (File No. LR7316)

LEC/ LEY series: UL Listed Class CC Branch Circuit

Fuseholder per UL 512 (File No. E14721)

CSA Certified per C22.2, No. 39 (File No. LR7316)

Mating fuses

LEB/LEX series: Accepts all 1 1⁄2” x 13 ⁄32” Midget and Class CC fuses

Littelfuse types BLF, BLN, FLM, FLQ, KLK, KLKD, KLKR,

KLDR and CCMR.

LEC/LEY series: Accepts only Class CC fuses.

Littelfuse types KLKR, KLDR and CCMR.

Blocks and Holders

146 www.littelfuse.com

Blocks and Holders

One-pole LEB and LEC Fuseholders

Basic single-pole LEB and LEC watertight fuseholders provide

protection for a variety of circuits. LEB fuseholders ac cept all

13/32” x 11/2” midget fuses providing sup ple men tal overcurrent

protection. LEC fuseholders are UL Listed Class CC fuseholders

which accept only Class CC fuses and meet National Electrical Code

requirements for branch circuit protection. The most common use for

either fuseholder is for protection of lighting circuits. However, consider

them wherever there is a need for secure in-line protection, from boat

circuits to electric wheelchairs. Great flexibility is achieved when the

basic holders are combined with breakaway receptacles, Y-terminals

and insulating boots.

Two-pole LEX and LEY Fuseholders

LEX and LEY fuseholders are intended for use on line-to-line circuits up

to 600 volts and are ideal for line-to-line loads such as 240 or 480 volt

ballasts. When the line and load sections of LEX and LEY fuseholders

are separated, or when the fuseholder is removed from a two-pole

breakaway receptacle, both lines are disconnected simultaneously. This

prevents the possibility of shock from backfeeding through an exposed

fuse, which could happen with single-pole fuseholders. The LEX holder

is a two-pole version of the LEB and accepts midget fuses, providing

supplementary overcurrent protection. The LEY holder is a two-pole

version of the LEC, which accepts only Class CC fuses, and may be

used to provide branch circuit protection. Both fuseholders may be

equipped with Y-terminals, breakaway receptacles and insulating boots.

One-pole LET Solid Neutral Disconnects

The LET solid neutral disconnect is designed for use as a no-load

non-fused disconnect. Similar in design to the LEB series fuseholders,

the LET is easily identified by its all white body. Internally, it has

a permanently installed solid tin-plated copper neutral slug which

eliminates the possibility of placing a fuse in the neutral side of the

circuit. Fusing the neutral side causes a safety hazard and also violates

the National Electrical Code. The LET is available in both breakaway and

non-breakaway configurations with a wide variety of ter mi na tions.

Breakaway Feature

Littelfuse LEB, LEC, and LET single-pole fuseholders and LEX and LEY

two-pole fuseholders are available with an optional breakaway feature

required to meet state and federal highway commission standards

requiring fuseholders to readily disconnect from the line in case of

a pole knockdown. The breakaway feature consists of a receptacle

permanently attached to the power line and a fuseholder with matching

terminals. When knockdown occurs, the parts separate readily. The

breakaway receptacle terminal is deeply recessed so that energized

parts are not exposed. The fuse remains safely enclosed inside the now

de-energized water tight fuseholder. After the pole has been reinstalled,

the fuseholder is easily plugged into the receptacle, im me di ate ly

restoring service. The breakaway feature may also be used in marinas,

travel trailer parks and other locations

where circuits subjected to strain

must be safely dis con nect ed.

In-Line Watertight Fuseholders

LEB/LEC

LEX/LEY

LET

Breakaway

Blocks and Holders

147

www.littelfuse.com

Blocks and Holders

In-Line Watertight Fuseholders

Insulating Boots

Molded from engineering grade ther mo plas tics, the

WPB1 and WPB2 provide a high resistance to cor-

ro sive en vi ron ments and deliver a watertight seal.

Boots are supplied as standard with all breakaway

versions. Weath er proof boots WPB1 and WPB2

can be pur chased separately for all non-breakaway

holders. Part number WPB1 contains one standard

boot for use with A, B, C, D, or J ter mi na tion. Part

number WPB2 contains one Y-pole boot for use with

the Y-pole termination. For watertight protection

of non-breakaway Y-pole fuseholders, order one

WPB1 and one WPB2 boot. For non-breakaway

double-pole LEX and LEY holders with A, B, C, D,

or J terminations, order four WPB1 boots. These

insulating boots are designed to fit snugly onto wire

insulation, but for best results with varying wire

insulation sizes, a tape wrap should be completed.

A & B Crimp

Terminal

C & D Crimp

Terminal

J Terminal

Y Terminal

4.5"

10.3"

( ASSEMBLED LENGTH )

5.4"

( ASSEMBLED LENGTH )

4.5"

9.3"

( ASSEMBLED LENGTH )

WPB1 BOOT

(OPTIONAL) WPB1 BOOT

(OPTIONAL)

INSULATING BOOT

(STANDARD) INSULATING BOOT

(STANDARD)

4.2"

4.5"

9.3"

( ASSEMBLED LENGTH )

10.3"

( ASSEMBLED LENGTH )

5.3"

( ASSEMBLED LENGTH )

Terminal Size T&B Part No. Burndy Part No.

AWT161M –

BWT161MMR4C

CWT115AHypress Y34A

DWT115AHypress Y34A

Recommended Crimping Tools

The following crimping tools or equivalents may be used on either the

non-breakaway or breakaway watertight in-line fuseholders.

Ordering Information

To order Littelfuse in-line fuseholders and disconnects by part number,

refer to the charts on the next page.

LEB - AA - S

Type

Load Side/Term Size

Breakaway Feature

Line Side/Term Size

Fuseholder Type Description

LEB One-pole in-line fuseholder for Midget and Class CC fuses

LEC One-pole in-line fuseholder for Class CC fuses

LET One-pole in-line solid neutral disconnect

LEX Two-pole in-line fuseholder for Midget and Class CC fuses

LEY Two-pole in-line fuseholder for Class CC fuses

Blocks and Holders

148 www.littelfuse.com

Blocks and Holders

In-Line Watertight Fuseholders

Selection Guide For Single Pole LEB/ LEC Fuse hold ers

Standard

Part No.

Breakaway

Part No. Fuse Type

Load Terminal Selection Line Terminal Selection

Terminal

Type

Load

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

Terminal

Type

Line

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

LEB-AA

LEC-AA

LEB-AA-S

LEC-AA-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#12 to #8 1 X X

#12 2 X X #12 2 X X

LEB-AB

LEC-AB

LEB-AB-S

LEC-AB-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#10 2 X X

#12 2 X X #6 1 X X

#4 1 — X

LEB-AC

LEC-AC

—

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#8 2 X X

#12 2 X X #4 1 — X

LEB-AD

LEC-AD

—

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#6 2 X X

#12 2 X X #2 1 — X

LEB-AJ

LEC-AJ

LEB-AJ-S

LEC-AJ-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Set-Screw

#12 to #8 1 X —

#12 2 X X #10 to #2 1 — X

LEB-AYC

LEC-AYC

LEB-AYC-S

LEC-AYC-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#12 2 X X #10 to #2 1 — X

LEB-BA

LEC-BA

LEB-BA-S

LEC-BA -S

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#12 to #8 1 X X

#6 1 X X #12 2 X X

#4 1 — X

LEB-BB

LEC-BB

LEB-BB-S

LEC-BB-S

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#10 2 X X

#6 1 X X #6 1 X X

#4 1 — X #4 1 — X

LEB-BC

LEC-BC

—

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#8 2 X X

#6 1 X X #4 1 — X

#4 1 — X

LEB-BD

LEC-BD

—

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#6 2 X X

#6 1 X X #2 1 — X

#4 1 — X

LEB-BJ

LEC-BJ

LEB-BJ-S

LEC-BJ-S

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Set-Screw

#12 to #8 1 X —

#6 1 X X #10 to #2 1 — X

#4 1 — X

LEB-BYC

LEC-BYC

LEB-BYC-S

LEC-BYC-S

Midget

Class CC

Copper

Crimp

#10 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#6 1 X X #10 to #2 1 — X

#4 1 — X

LEB-CA

LEC-CA

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#12 to #8 1 X X

#4 1 — X #12 2 X X

LEB-CB

LEC-CB

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#10 2 X X

#4 1 — X #6 1 X X

#4 1 — X

LEB-CC

LEC-CC

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#8 2 X X

#4 1 — X #4 1 — X

LEB-CD

LEC-CD

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#6 2 X X

#4 1 — X #2 1 — X

LEB-CJ

LEC-CJ

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Set-Screw

#12 to #8 1 X X

#4 1 — X #10 to #2 1 — X

LEB-CYC

LEC-CYC

—

Midget

Class CC

Copper

Crimp

#8 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#4 1 — X #10 to #2 1 — X

LEB-DA

LEC-DA

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#12 to #8 1 X —

#2 1 — X #12 2 X X

LEB-DB

LEC-DB

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#10 2 X X

#2 1 — X #6 1 X X

#4 1 — X

LEB-DC

LEC-DC

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#8 2 X X

#2 1 — X #4 1 — X

LEB-DD

LEC-DD

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#6 2 X X

#2 1 — X #2 1 — X

LEB-DJ

LEC-DJ

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Set-Screw

#12 to #8 2 X X

#2 1 — X #10 to #2 1 — X

LEB-DYC

LEC-DYC

—

Midget

Class CC

Copper

Crimp

#6 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#2 1 — X #10 to #2 1 — X

LEB-JJ

LEC-JJ

LEB-JJ-S

LEC-JJ-S

Midget

Class CC

Copper

Set Screw

#12 to #8 1X

—Copper

Set-Screw

#12 to #8 1X—

#10 to #2 1—X#10 to #2 1—X

LEB-JYC

LEC-JYC

LEB-JYC-S

LEC-JYC-S

Midget

Class CC

Copper

Set Screw

#12 to #8 1X

—“Y” Type

Copper

Set-Screw

#12 to #8 1X—

#10 to #2 1—X#10 to #2 1—X

Blocks and Holders

149

www.littelfuse.com

Blocks and Holders

Standard

Part No.

Breakaway

Part No. Fuse Type

Load Terminal Selection Line Terminal Selection

Terminal

Type

Load

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

Terminal

Type

Line

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

LEX-AA

LEY-AA

LEX-AA-S

LEY-AA-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#12 to #8 1 X X

#12 2 X X #12 2 X X

LEX-AB

LEY-AB

LEX-AB-S

LEY-AB-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#10 2 X X

#12 2 X X #6 1 X X

#4 1 — X

LEX-AC

LEY-AC

—

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#8 2 X X

#12 2 X X #4 1 — X

LEX-AD

LEY-AD

—

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#6 2 X X

#12 2 X X #2 1 — X

LEX-AYC

LEY-AYC

LEX-AYC-S

LEY-AYC-S

Midget

Class CC

Copper

Crimp

#12 to #8 1 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#12 2 X X #10 to #2 1 — X

LEX-BA

LEY-BA

LEX-BA-S

LEY-BA -S

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#12 to #8 1 X X

#6 1 X X #12 2 X X

#4 1 — X

LEX-BB

LEY-BB

LEX-BB-S

LEY-BB-S

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#10 2 X X

#6 1 X X #6 1 X X

#4 1 — X #4 1 — X

LEX-BC

LEY-BC

—

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#8 2 X X

#6 1 X X #4 1 — X

#4 1 — X

LEX-BD

LEY-BD

—

Midget

Class CC

Copper

Crimp

#10 2 X X Copper

Crimp

#6 2 X X

#6 1 X X #2 1 — X

#4 1 — X

LEX-BYC

LEY-BYC

LEX-BYC-S

LEY-BYC-S

Midget

Class CC

Copper

Crimp

#10 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#6 1 X X #10 to #2 1 — X

#4 1 — X

LEX-CA

LEY-CA

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#12 to #8 1 X X

#4 1 — X #12 2 X X

LEX-CB

LEY-CB

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#10 2 X X

#4 1 — X #6 1 X X

#4 1 — X

LEX-CC

LEY-CC

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#8 2 X X

#4 1 — X #4 1 — X

LEX-CD

LEY-CD

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Crimp

#6 2 X X

#4 1 — X #2 1 — X

LEX-CJ

LEY-CJ

—

Midget

Class CC

Copper

Crimp

#8 2 X X Copper

Set-Screw

#12 to #8 1 X —

#4 1 — X #10 to #2 1 — X

LEX-CYC

LEY-CYC

—

Midget

Class CC

Copper

Crimp

#8 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#4 1 — X #10 to #2 1 — X

LEX-DA

LEY-DA

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#12 to #8 1 X X

#2 1 — X 12 2 X X

LEX-DB

LEY-DB

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#10 2 X X

#2 1 — X #6 1 X X

#4 1 — X

LEX-DC

LEY-DC

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#8 2 X X

#2 1 — X #4 1 — X

LEX-DD

LEY-DD

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Crimp

#6 2 X X

#2 1 — X #2 1 — X

LEX-DJ

LEY-DJ

—

Midget

Class CC

Copper

Crimp

#6 2 X X Copper

Set-Screw

#12 to #8 1 X —

#2 1 — X #10 to #2 1 — X

LEX-DYC

LEYDYC

—

Midget

Class CC

Copper

Crimp

#6 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#2 1 — X #10 to #2 1 — X

LEX-JJ

LEY-JJ

LEX-JJ-S

LEY-JJ-S

Midget

Class CC

Copper

Set-Screw

#12 to #8 1 X — Copper

Set-Screw #12 to #8 1X—

#10 to #2 1 — X 1 — X

In-Line Watertight Fuseholders

Selection Guide For Double Pole LEX/ LEY Fuse hold ers

Blocks and Holders

150 www.littelfuse.com

Blocks and Holders

In-Line Watertight Fuseholders

Selection Guide For Solid Neutral LET Fuse hold ers

Standard

Part No.

Breakaway

Part No. Fuse Type

Load Terminal Selection Line Terminal Selection

Terminal

Type

Load

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

Terminal

Type

Line

Terminal

Wire Size

Range

No. of

Wires per

Terminal

Solid

Wire

Stranded

Wire

LET-AA LET-AA-S Solid

Neutral

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#12 to #8 1 X X

#12 2 X X #12 2 X X

LET-AB LET-AB-S Solid

Neutral

Copper

Crimp

#12 to #8 1 X X Copper

Crimp

#10 2 X X

#12 2 X X #6 1 X X

#4 1 — X

LET-AYC LET-AYC-S Solid

Neutral

Copper

Crimp

#12 to #8 1 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#12 2 X X #10 to #2 1 — X

LET-BA LET-BA-S Solid

Neutral

Copper

Crimp

#10 2 X X Copper

Crimp

#12 to #8 1 X X

#6 1 X X #12 2 X X

#4 1 — X

LET-BB LET-BB-S Solid

Neutral

Copper

Crimp

#10 2 X X Copper

Crimp

#10 2 X X

#6 1 X X #6 1 X X

#4 1 — X #4 1 — X

LET-BYC LET-BYC-S Solid

Neutral

Copper

Crimp

#10 2 X X “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#6 1 X X #10 to #2 1 — X

#4 1 — X

LET-JJ LET-JJ-S Solid

Neutral

Copper

Set-Screw

#12 to #8 1 X — Copper

Set-Screw

#12 to #8 1 X —

#10 to #2 1 — X #10 to #2 1 — X

LET-JYC LET-JYC-S Solid

Neutral

Copper

Set-Screw

#12 to #8 1 X — “Y” Type

Copper

Set-Screw

#12 to #8 1 X —

#10 to #2 1 — X #10 to #2 1 — X

Terminal Selec tion Guide

Terminal Designation Terminal Description Number of Wires per Terminal Wire Range Wire Type

A Copper Crimp 1

#12-#8

#12

Solid/Stranded

B Copper Crimp

#10

Solid/Stranded

Stranded

C Copper Crimp 2

Solid/Stranded

Stranded

D Copper Crimp 2

Solid/Stranded

Stranded

J Copper Set Screw 1

#12-#8

#10-#2

Solid

Stranded

Y (2 terminals) “Y” Style Copper Set Screw 1

#12-#8

#10-#2

Solid

Stranded

www.littelfuse.com

Miscellaneous Products

LPS Series POWR-Switch 152-153

LPMP Series POWR-Switch Panel 154-155

Disconnect Switches 156

Misc. Products - Fuse Reducers 157

Box Cover Units 158-159

Misc. Products - Electronic Fuse Display; Spare Fuse Cabinet 160

Miscellaneous Products

152 www.littelfuse.com

Misc. Products

LPS Series POWR-Switch

The Littelfuse POWR-Switch provides a simple and economical

solution for applications that require selective coordination and shunt

trip capabilities. Common applications include elevator circuits, data

processing rooms, and building emergency systems.

By utilizing Class J time-delay fuses, the POWR-Switch is 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. The POWR-Switch also features

pre-wired control circuits that can help reduce installation costs.

Standard Features

• 600V 3-pole fuse power switch

• 200,000 RMS interrupting rating

• Shunt trip 120V

• Control power terminal block

• Ground lug per NEC

• Class J fuse block

• NEMA 1 enclosures

Optional Features

• Control power transformer with fuses and blocks

• Fire safety interface relay

• Key to test switch

• Pilot light ”On”

• Isolated neutral lug

• Mechanical interlock auxilliary contact for hydraulic elevators with

automatic recall (5 amp 120 VAC rated)

• Fire alarm voltage monitoring relay

• NEMA 3R, 4, and 12 enclosures

Benefits

• Optional features offer flexibility for a variety of applications

• UL Listed package

• Lower installation costs than systems with many separate components

• Pre-wired control circuits lower installation time

• Lockable Operating handle meets all code and safety requirements

• No confusion over which building trade is supplying the components

• POWR-Switch is a single unit, which makes procurement easier than

systems with multiple components

Miscellaneous Products

153

www.littelfuse.com

Misc. Products

Littelfuse

Switch Catalog

Number

Control Power

Transformer

Std. 100VA with

PRI & SEC Fuse

(120V Sec.)

Fire Safety

Interface Relay

(3PDT, 10amp, 120V)

Key to

Test Switch

Pilot Light

“ON”

Isolated

Neutral Lug

Mechanical

Interlock Auxilliary

Contact for Hydraulic

Elevators w/

Automatic Recall

(5 amp 120 VAC rated)

Fire Alarm Voltage

Monitoring Relay

(To Monitor Shunt

Trip Voltage)

Optional

Enclosures

Catalog

No. Rating Rating Option

Code Rating Option

Code

LPS3 30A 208V T20 24 VDC Coil R2 120V K Red R 30–60A N6 1 NO & 1 NC A Single Pole F1 NEMA 3R U

LPS6 60A 240V T24 120 VAC Coil R1 Green G 100A N1 2 NO & 2 NC B Three Pole F3 NEMA 4 Y

LPS1 100A 480V T48 White W 200A N2 NEMA 12 Z

LPS2 200A 600V T60 400A N4

LPS4 400A

Note: Desired options must appear 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.

Catalog Series Amp Rating NEMA 1 Dimensions NEMA 3R Dimensions NEMA 4, 12 Dimensions Lug Size

LPS3 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 20”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 12”D Contact Factory Contact Factory 3/0 AL or CU

Note: Over-size enclosures used to accomodate control power transformer, interface relay and terminal blocks.

*For NEMA 3R enclosures add 2 inches to height for mounting tabs.

Amp Rating Voltage Rating Max Inrush Max Ontime Momentary Inrush

30–400A 120V, 60Hz 4A 1.5 cycles 140VA

LPS Series POWR-Switch

Specifications

Approvals: UL Listed and CSA Certified

Rating: 30A, 60A, 100A, 200A, 400A

Shunt Trip Ratings:

Enclosure Dimensions

Example Catalog Number:

LPS1 T48 R1 K N1 U = Littelfuse Catalog Number LPS1T48R1KN1U

Ordering Information

Complete catalog numbers consist of switch catalog numbers and the desired options. See example below.

Miscellaneous Products

154 www.littelfuse.com

Misc. Products

Littelfuse LPMP series POWR-Switch Panel is designed specifically

for applications that require shunt-trip capabilities and the need to

individually control power for a bank of equipment. The POWR-Switch

Panel offers the flexibility to incorporate multiple switches into a panel

enclosure and meet all applicable code requirements.

Standard Features

• UL Listed Package

• NEMA 1 Enclosure

• Fusible Class J Switches (rated 30-400 amps)

• 200,000 amp RMS Short-Circuit Rating

Optional Features

• Control Power Transformers

• Fire Safety Interface Relay

• Key to Test Switch

• Pilot Light “On”

• Mechanical Interlock Auxiliary Contact (for hydraulic elevators

with recall)

• Fire Alarm Voltage Monitor Relay

• NEMA 3R Enclosures

Ordering Information

Catalog Numbers

LPMP 400

LPMP 600

LPMP 800

Specifications

Voltage Rating: 600V

Short-Circuit Rating: 200,000 amps RMS

Ampere Ratings: 400, 600, 800A

Approvals: UL Listed to UL 67 Panelboards and

UL 891 Dead Front Switches

LPMP Series POWR-Switch Panel

600 Volts • Shunt-Trip Disconnect Switch

NEW

Miscellaneous Products

155

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Misc. Products

LPMP Series POWR-Switch Panel

600 Volts • Shunt-Trip Disconnect Switch

Standard Panel Dimensions

Panel

Rating

Dimensions (in.)

H x W x D

Available Space (X units)

3W 4W

400 A 57 x 40 x 12 18X 16X

600 A 73.5 x 40 x 12 26X 24X

800 A 90 x 40 x 12 38X 35X

Note: “X” Space = 13⁄8 inches (refers to height only)

Main Lug Terminal Information

Panel

Rating

Cond.

/Phase Wire Range Bending Space

Top /Bot. Side

400 A (2) # 6 - 300 kcmil Al or Cu 11.31" 10.00"

(1) 3 ⁄ 0 - 750 kcmil Al or Cu

600 A (2) 3 ⁄ 0 - 500 kcmil Al or Cu 11.31" 10.00"

800 A (3) 3 ⁄ 0 - 500 kcmil Al or Cu 11.31" 10.00"

(2) 3 ⁄ 0 - 750 kcmil Al or Cu

Note: Local codes may change minimum wire bends.

POWR-Switch Panel “Bucket” Options

Bucket/Switch Rating Description Space Conductors

Per Phase Wire Range

30 ⁄ 30 Twin 30 amp switches 4X (1) # 14 – # 8 Al or Cu

30 / Blank Single 30 amp switch 4X (1) # 14 – # 8 Al or Cu

60 ⁄ 60 Twin 60 amp switches 4X (1) # 14 – # 2 Al or Cu

60 / Blank Single 60 amp switch 4X (1) # 14 – # 2 Al or Cu

100 ⁄ 100 Twin 100 amp switches 4X (1) # 8 – 1/0 Al or Cu

100 / Blank Single 100 amp switch 4X (1) # 8 – 1/0 Al or Cu

200 ⁄ 200 Twin 200 amp switches 6X (1) # 6 – 250 kcmil Al or Cu

200 / Blank Single 200 amp switch 6X (1) # 6 – 250 kcmil Al or Cu

400 Single 400 amp switch 12X (2) 3 ⁄ 0 – 750 kcmil Al or Cu

Accessory Contains CPT, Pilot Lights, etc. 6X N/A N/A

Panel Spacing

Main Lugs Only

6X Accessory Bucket

4X 30A Switch 30A Switch

4X 60A Switch 60A Switch

4X 100A Switch 100A Switch

6X 200A Switch 200A Switch

6X Accessory Bucket

12X 400A Switch

Thru-Feed Lugs

Note: Main Lug Only is standard.

One Accessory bucket is required for every four switch units.

Miscellaneous Products

156 www.littelfuse.com

Misc. Products

Disconnect Switches

Fusible/Non-fusible

Accessories

The LFFS series fusible switches eliminate the need for a separate

fuse block by integrating a three pole fuse holder into the switch body.

This saves precious panel space and reduces wiring time. These rod-

operated devices are UL Listed and CSA Certified.

Applications

Littelfuse disconnect switches are perfect for use where the National

Electrical Code requires that a separate disconnect means be located

within sight of all motor loads. Commonly used as a main switch

or distribution switches, these units are also ideal for use as safety

switches for air conditioners, pumps and compressors. The LFDS series

disconnect switches can be used with external fuse blocks, permitting

the use of Class RK1, RK5, J and CC fuses.

Features/Benefits

• Reduce panel costs – Compact size minimizes panel space and

reduces enclosure costs. The fusible 30 amp Class CC switch is the

smallest available in the market.

• Reduce installation time – Panel-mount or integral DIN rail-mount

allows quick and easy mounting.

• Flexible design – Optional accessories offer flexibility for various

applications.

• Protect personnel – Dead-front design and optional terminal covers

minimizes exposure to live parts.

• Lockable operator knob/handle – LFRK001 style knob meets

OSHA standard for control of hazardous energy sources. Other knobs

and handles meet IP65.

Specifications

Voltage: 600VAC

Interrupting Rating: 10,000 amperes

Required Screw Torque: 16 inch pounds

Ampere Ratings: 30–100 Amperes

Approvals: UL Listed (File No. E166081)

CSA Certified

Ordering Information

Part Number Description

LFFS030CC 30A Fusible Class CC Switch

LFDS030 30A Non-Fusible Switch

LFDS040 40A Non-Fusible Switch

LFDS060 60A Non-Fusible Switch

LFDS100 100A Non-Fusible Switch

Note: Handles and accessories sold separately.

LFRH001*Red Handle LFCB001 Add-on Con tact Block (N. O.) LFTC001 Terminal Cover (1 Pair)

LFRK001*Red Knob LFCB002 Add-on Contact Block (N. C.) LFTC002 LFDS030 Terminal Cover (1 Pair)

LFBH001*Black Handle LFCB003 100A Add-on Contact Block (N. C.) LFTC003 LFDS100 Terminal Cover (1 Pair)

LFBK001*Black Knob LFCB004 100A Add-on Contact Block (N. C.)

LFBK002** Black Knob LFPP001 30A Add-on Power Pole (N. O.)

SHFT002 Shaft (19.68") LFPP002 30A Add-on Power Pole (N. C.)

SHFT003 Shaft (11.81")

SHFT005 Shaft (7.78")

* Includes mounting hardware and standard length shaft for enclosures 3.5" through 8" deep.

** Supplied with 2" shaft Note: LFRH001, LFBH001, LFBK001 and LFBK002 are not lockable.

Miscellaneous Products

157

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Misc. Products

Miscellaneous Products

Fuse Reducers

600 Volt

Part No. (pair) Fuse Clip Fuse Case Size

LRUJ63 60A 30A

LRUJ13 100A 30A

LRUJ16* 100A 60A

LRUJ26 200A 60A

LRUJ21 200A 100A

LRUJ41 400A 100A

LRUJ42 400A 200A

LRUJ64 600A 400A

* Fuse and reducer com bi na tion is slightly larger in diameter than

100A Class J fuses. For specific ap pli ca tions, contact factory.

Class J reducers can not be used in bolt-on applications.

Littelfuse fuse reducers allow smaller size fuses to be installed into

existing fuse clips to prevent overfusing.

• Allows lower ampere-rated fuses to be used in existing fuse clips.

• Simple installation.

• Reduces inventory requirements.

• Silver brazed joints for maximum strength.

• UL Listed (File No. E136855) CSA Certified (File No. LR92899)

Refer to fuse section of this catalog for fuse di men sions.

600 Volt

Part No. (pair) Fuse Clip Fuse Case Size

LRU 663 M 60A 30A

LRU 216 100A 30A

LRU 616 100A 60A

LRU 626 200A 60A

LRU 2621 200A 100A

LRU 2641 400A 100A

LRU 2642 400A 200A

LRU 2661 600A 100A

LRU 2662 600A 200A

LRU 2664 600A 400A

600 Volt

Part No. (pair) Fuse Clip Fuse Case Size

LRU 663 R 60A 30A

LRU 216 R 100A 30A

LRU 616 R 100A 60A

LRU 626 R 200A 60A

LRU 2621 R 200A 100A

LRU 2641 R 400A 100A

LRU 2642 R 400A 200A

LRU 2661 R 600A 100A

LRU 2662 R 600A 200A

*LRU 2664 R 600A 400A

* Only one reducer required.

250 Volt

Part No. (pair) Fuse Clip Fuse Case Size

LRU 263 M 60A 30A

LRU 213 M 100A 30A

LRU 216 100A 60A

LRU 226 200A 60A

LRU 2621 200A 100A

LRU 2641 400A 100A

LRU 2642 400A 200A

LRU 2661 600A 100A

LRU 2662 600A 200A

LRU 2664 600A 400A

250 Volt

Part No. (pair) Fuse Clip Fuse Case Size

LRU 263 R 60A 30A

LRU 213 R 100A 30A

LRU 216 R 100A 60A

LRU 226 R 200A 60A

LRU 2621 R 200A 100A

LRU 2641 R 400A 100A

LRU 2642 R 400A 200A

LRU 2661 R 600A 100A

LRU 2662 R 600A 200A

*LRU 2664 R 600A 400A

* Only one reducer required.

Class H/K5

Fuse Reducers

For use with Littelfuse NLN/NLS

and RLN/RLS series fuses.

Class R

Fuse Reducers

For use with Littelfuse FLNR_ID/

FLSR_ID, IDSR, LLNRK/LLSRK,

LLSRK_ID, and KLNR/KLSR

series fuses.

Class J

Fuse Reducers

For use with Littelfuse JTD_ID/

JTD and JLS series fuses.

Miscellaneous Products

158 www.littelfuse.com

Misc. Products

Fig. No. Littelfuse Part No. Box Cover Features To Be Mounted On:

LSOU One Edison-Base Fuse Holder 21⁄4" Handy Box

LSOW One Edison-Base Fuse Holder 23⁄4" Switch Box

LSOX One Edison-Base Fuse Holder 4" Octagon Box

LSOY One Edison-Base Fuse Holder 4" Square Box

LSRU One Edison-Base Fuse Holder and Grounding Receptacle 21⁄4" Handy Box

LSRW One Edison-Base Fuse Holder and Grounding Receptacle 23⁄4" Switch Box

LSRX One Edison-Base Fuse Holder and Grounding Receptacle 4" Octagon Box

LSRY One Edison-Base Fuse Holder and Grounding Receptacle 4" Square Box

LSSU One Edison-Base Fuse Holder and Single Pole Switch 21⁄4" Handy Box

LSSW One Edison-Base Fuse Holder and Single Pole Switch 23⁄4" Switch Box

LSSX One Edison-Base Fuse Holder and Single Pole Switch 4" Octagon Box

LSSY One Edison-Base Fuse Holder and Single Pole Switch 4" Square Box

4 LSOY-B Two Edison-Base Fuse Holders 4" Square Box

5LSSY-L One Edison-Base Fuse Holder

One Single Pole Switch and Pilot Light 4" Square Box

6LSSY-RL

One Edison-Base Fuse Holder

One Grounding Receptacle

One Single Pole Switch and Pilot Light

4" Square Box

7 LSCY Two Edison-Base Fuse Holders and Two Single Pole Switches 4" Square Box

8 LSKA Two Edison-Base Fuse Holders

One 250V Grounding Receptacle 411 ⁄16" Square Box

9 LSTY Two Edison-Base Fuse Holders and One 2-Pole Switch 4" Square Box

Box Cover Units

Box cover units provide an eco nom i cal method of protecting small

motors against overcurrent damage. For use with Edison-Base plug

fuses (TOO, TLO) or Type S plug fuses (SOO, SLO) with adapters (SAO).

Specifications

Voltage: 125V

Ampere Rating: 15 Amperes

Approvals: UL Listed

Miscellaneous Products

159

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Misc. Products

Box Cover Units

LSSU LSSW LSSY LSTY

LSRU LSRW LSRY LSCY

LSOU LSOW LSOY LSOY-B

LSSY-L LSSY-RL

LSOX LSRX LSSX

41⁄2” Box

LSKA

31⁄2” Octagonal Box

2-1/4” Handy Box 4” Handy Box

Miscellaneous Products

160 www.littelfuse.com

Misc. Products

Electronic Fuse Display • Spare Fuse Cabinet

Electronic Fuse Display

Fully stocked rack includes the following parts:

3AG (Glass)

Fast Acting Fuses

3AG (Glass)

Slo-Blo® Fuses

3AB (Ceramic)

Normal-Blo Fuses

3AB (Ceramic)

Slo-Blo® Fuses

Quantity Part No. Quan ti ty Part No. Quan ti ty Part No. Quan ti ty Part No.

25 312 1⁄2A25313 1⁄2A25314 15A25 326 8A

50 312 1A 25 313 3⁄4A 25 314 20A 20 326 10A

25 312 11⁄2A 25 313 1A 25 314 30A

75 312 2A 25 313 11⁄2A

25 312 21⁄2A50 313 2A

75 312 3A 25 313 21⁄2A

25 312 4A 25 313 3A

25 312 5A 25 313 4A

25 312 10A 25 313 5A

Sturdy steel cabinet holds spare fuses. Cabinet can be locked to prevent

un au tho rized access and is weather stripped to reduce the ac cu mu la-

tion of dust, dirt and moisture. Con ve nient inventory card located inside

door. Measures 30" H × 24" W × 12" D. Keyhole mounting holes 16" on

center for easy installation.

Ordering Information

Spare Fuse Cabinet: Part No. LSFC

Spare Keys: Part No. LKEY001

The sturdy wall-mountable or free-standing modular rack system

prominently displays the most popular Littelfuse glass and automotive

fuses. Additional sections can be quickly snapped on to provide a larger

product selection. Each rack features a cross reference and full color

identification guide to help customers locate the proper replacement fuse.

• 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.

• 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.

Ordering Information

Fully stocked display: Littelfuse part number: 094324PG

Littelfuse system number: 00940324ZXPG

Empty display rack: Littelfuse part number: FDR001PG

Littelfuse system number: 0FDR0001ZXPG

Additional sections: Littelfuse part number: MRS001PG

Littelfuse system number: 0MRS0001ZXPG

Spare Fuse Cabinet

www.littelfuse.com

International Products

LgD Series Global Pro™ Fuses 162

LPSG Series Global Pro™ Fuseholders 163

NH Fuse Links 164-165

Diazed/Neozed Fuses 166-167

Cylindical Fuses 168

British Dimension HRCII-C Fuses 169

International Products

162 www.littelfuse.com

International Products

LgD Series Global Pro™ Fuses

600 Volts AC • Time-Delay • 1 – 100 Amperes

Littelfuse Global Pro is the world’s only fuse system designed for use

anywhere, in any equipment, in virtually any country. Global Pro simplifies

circuit protection by incorporating North American electrical requirements

into fuse styles found in the rest of the world. Reduced size, touch-safe

design, and international acceptance make the Global Pro system the easy

circuit protection choice for engineers and equipment designers everywhere.

Global Pro fuses provide quick and positive visual identification of blown

fuses by using a pop-up indicator design that protrudes from the top of

the fuse, immediately alerting maintenance personnel that it needs to

be replaced. The pop-up indicator is designed to activate a microswitch

built into every Global Pro fuseholders that can activate stack-lights or

to integrate into PLC networks and provide equipment operators with a

remote method of determining when the fuse needs to be replaced.

The Global Pro system is designed to save valuable space in a crowded

panel while providing designers with the flexibility of a universally

accepted design for easy replacement. These fuses are far more

compact and have greater power handling capability than conventional

products. Global Pro fuses are up to 75% smaller than Class RK5 fuses

and up to 50% smaller than Class J fuses while providing the time-delay

characteristics that are necessary for motor circuit protection.

Applications

• Motor control centers

• Motor branch circuits

• Primary and secondary protection for transformers

• Equipment designed for export

Features And Benefits

The Global Pro fuse is physically compatible with IEC style fuseholders

allowing it to be used in virtually any market. The IEC dimensions of the

Global Pro fuseholder allow easy adaptation of exported equipment by

simply replacing the fuse with one that meets local standards.

• Extremely compact size

• Pop-up pin indication

• Meets performance requirements of UL Class J fuses

• Global acceptance

• UL approval

• Universal voltages

• Touch -safe components

• Integrated lockout/tagout device for compliance

• Design versatility for OEMs

• Designed to IEC standards

Size Chart

Part Number Amperage English Metric

LgD 0–30A 0–30A 9⁄16” x 2” 14mm x 51mm

LgD 35–60A 35–60A 13 ⁄16” x 21⁄4”22mm x 58mm

LgD 70–100A 70–100A 11⁄16” x 23⁄8” 27mm x 60mm

Specifications

Voltage Ratings: AC: 600 Volts (UL)

690 Volts (IEC)

DC: 300 Volts

Interrupting Rating: AC: 200,000 amperes rms symmetrical

DC: 20,000 amperes rms symmetrical

Ampere Range: 1 – 100* amperes

Approvals: UL Listed Special Purpose 1–30 amps

(File No. E71611)

UL Recognized 35–60 amps (File No. E71611)

CSA Certified 1–60 amps (File No. LR29862)

Ampere ratings

151225406090*

2715304570*100*

31020355080*

*Contact factory for ratings above 60A

Example part number (series & amperage): LgD 60

International Products

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International Products

LPSG Series Global Pro™ Fuseholders

Contact factory for dimensions.

Specifications

Voltage Ratings: 600 Volts (UL)

690 Volts (IEC)

Interrupting Rating: AC: 200kA rms symmetrical

DC: 20kA

Ampere Range: 30, 60, and 100* amperes

Terminal Type: Pressure Plate

Wire Range: #2 – #14 CU

Material: Thermo-plastic

Approvals: UL Recognized

CSA Certified

*Contact factory for ratings above 60A

Littelfuse Global Pro is the world’s only fuse system designed for

use anywhere, in any equipment, in virtually any country. Global Pro

simplifies circuit protection by incorporating North American electrical

requirements into fuse styles found in the rest of the world. Reduced

size, touch-safe design, and international acceptance make the Global

Pro system the easy circuit protection choice for engineers and

equipment designers everywhere.

Every Global Pro fuseholder includes a microswitch that is activated by

a blown fuse. This allows the Global Pro system to be integrated into

PLC networks and provide equipment operators with a remote method

of determining when the fuse needs to be replaced. Global Pro holders

also feature a blown fuse indicator light to help maintenance personnel

quickly locate the proper circuit.

The Global Pro system is designed to save valuable space in a crowded

panel, while providing designers with the flexibility of a universally

accepted design for easy replacement. These fuses are far more

compact and have greater power handling capability than conventional

products. Global Pro fuses are up to 75% smaller than Class RK5 fuses

and up to 50% smaller than Class J fuses while providing the time-delay

characteristics that are necessary for motor circuit protection.

Applications

• Motor control centers

• Motor branch circuits

• Primary and secondary protection for transformers

• Equipment designed for export

Features And Benefits

The Global Pro Fuseholder also accepts IEC dimension cartridge style

fuses, allowing equipment to be easily adapted for export markets by

simply replacing the fuse with one that meets local standards.

• Extremely compact size

• Blown fuse indicator

• Integrated lockout/tagout tab

• Din-Rail mountable (35mm DIN-Rail)

• Integrated microswitch with N.O. and N.C. contacts

• Global compatibility – Accepts Global Pro fuses and European IEC

dimension cartridge style fuses

• UL and IEC approval

• Touch-safe design with integrated lockout/tagout device for

compliance

• Design versatility for OEMs

Ordering Information

Catalog No. Amp Rating Poles

LPSG30-1MI 30A 1

LPSG30-2MI 30A 2

LPSG30-3MI 30A 3

LPSG60-1MI 60A 1

LPSG60-2MI 60A 2

LPSG60-3MI 60A 3

LPSG100-1MI 100A 1

LPSG100-2MI 100A 2

LPSG100-3MI 100A 3

International Products

164 www.littelfuse.com

International Products

All NH fuse links incorporate a blown fuse indicator.

NH Fuse Links

500 Volts • 2 – 630 Amperes

Littelfuse European style NH fuse links are designed for the protection of conductors and

motors. The gL-gG characteristic fuse links are generally used to protect cables and installation

lines from overloads and short-circuits. The aM characteristic fuse links are used for the short-

circuit protection of motors and switchgear. They are available in NH00C to NH3 sizes up to 630

amperes.

Specifications

Standards: DIN 43.620, IEC 269-2-1

Approvals: VDE

Example part number: NH1CG25 (size, characteristic and amperage)

Size Current Range Voltage

(AC/DC)

Interrupting

Rating

Nominal

Frequency Selectivity

00C 2A up to 100A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

00 2A up to 160A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

0 6A up to 160A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

1C 25A up to 160A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

1 63A up to 250A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

2C 40A up to 250A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

2 125A up to 400A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

3C 315A up to 400A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

3 315A up to 630A 500V/440V 120kA/25kA 45 - 62 Hz 1:1 25

Amperage gL-gG 500V aM 500V

NH00C/NH00 NH0 NH1C/NH1 NH2C/NH2 NH3C/NH3 NH00M NH1 NH2 NH3

2NH00CG2————NH00M2———

4NH00CG4————NH00M4———

6NH00CG6NH0G6———NH00M6———

10 NH00CG10 NH0G10 — — — NH00M10 — — —

16 NH00CG16 NH0G16 — — — NH00M16 — — —

20 NH00CG20 NH0G20 — — — NH00M20 — — —

25 NH00CG25 NH0G25 NH1CG25 — — NH00M25 — — —

32 NH00CG32 NH0G32 NH1CG32 — — NH00M32 — — —

35 NH00CG35 NH0G35 NH1CG35 — — NH00M35 — — —

40 NH00CG40 NH0G40 NH1CG40 NH2CG40 — NH00M40 — — —

50 NH00CG50 NH0G50 NH1CG50 NH2CG50 — NH00M50 — — —

63 NH00CG63 NH0G63 NH1CG63 NH2CG63 — NH00M63 NH1M63 — —

80 NH00CG80 NH0G80 NH1CG80 NH2CG80 — NH00M80 NH1M80 — —

100 NH00CG100 NH0G100 NH1CG100 NH2CG100 — NH00M100 NH1M100 — —

125 NH00G125 NH0G125 NH1CG125 NH2CG125 — NH00M125 NH1M125 NH2M125 —

160 NH00G160 NH0G160 NH1CG160 NH2CG160 — NH00M160 NH1M160 NH2M160 —

200 — — NH1G200 NH2CG200 — — NH1M200 NH2M200 —

224 — — NH1G224 NH2CG224 — — NH1M224 NH2M224 —

250 — — NH1G250 NH2CG250 — — NH1M250 NH2M250 —

300———NH2G300———NH2M300—

315 — — — NH2G315 NH3CG315 — — NH2M315 NH3M315

355 — — — NH2G355 NH3CG355 — — NH2M355 NH3M355

400 — — — NH2G400 NH3CG400 — — NH2M400 NH3M400

425————NH3G425————

500————NH3G500———NH3M500

630————NH3G630———NH3M630

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NH Fuse Links

NH Fuse Link Dimensions

NH Bases / Disconnects

Fuse Bases

Part No. Size Rating Connection

NHB00B 00 690V/160A Bolt

NHB00C 00 690V/160A V-Clamp

NHB1B 1 690V/250A Bolt

NHB2B 2 690V/400A Bolt

NHB3B 3 690V/630A Bolt

All fuse bases are single pole and gangable.

Fuse Disconnects

Part No. Size Rating Connection

NHFSC00B C00 690V/100A Bolt

NHFS0B 0 690V/160A Bolt

NHFS1B 1 690V/250A Bolt

NHFS2B 2 690V/400A Bolt

NHFS3B 3 690V/630A Bolt

All disconnects are 3 pole.

Contact factory for dimensional information.

Size Current Range Dimensions (mm)

ABCD

00C 2-100A 78.00 54.00 51.30 20.00

00 2-160A 78.00 54.00 56.40 30.00

0 6-160A 123.95 70.11 53.34 30.00

1C 25-160A 135.00 75.00 56.40 30.00

1 63-250A 135.00 75.00 64.30 40.00

2C 40-250A 150.00 75.00 64.26 40.00

2 125-400A 150.00 75.00 74.20 50.00

3C 315-400A 150.00 75.00 74.20 50.00

3315-630A150.0075.0087.3771.88

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International Products

Base Size Type Current Range Voltage AC/DC Interrupting

Rating

14 D01 2-16A 380V/250V 50kA

18 D02 20-63A 380V/250V 50kA

16 DI 2-25A 500V 80kA

27 DII 2-25A 500V 80kA

33 DIII 35-63A 500V 80kA

All Diazed and Neozed fuses incorporate a blown fuse indicator.

Diazed/ Neozed Fuses

380-500 Volts AC • 2 – 63 Amperes

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. Ratings are available in standard Diazed and compact Neozed

styles.

Specifications

Standards: DIN 49.522-DIN 49.525, IEC 269-3

Approvals: VDE

Example part number: DZ27F4

Diazed Fuses Neozed Fuses

gL-gG aM DIM.gL-gG DIM.

Amperage Color DI DII DIII DI DII DIII A (mm) D01 D02 A (mm)

2 Pink DZ16F2 DZ27F2 — DZ16T2 DZ27T2 — 6 D0Z14G2 — 7.3

4 Brown DZ16F4 DZ27F4 — DZ16T4 DZ27T4 — 6 D0Z14G4 — 7.3

6 Green DZ16F6 DZ27F6 — DZ16T6 DZ27T6 — 6 D0Z14G6 — 7.3

10 Red DZ16F10 DZ27F10 — DZ16T10 DZ27T10 — 8 D0Z14G10 — 8.5

16 Grey DZ16F16 DZ27F16 — DZ16T16 DZ27T16 — 10 D0Z14G16 — 9.7

20 Blue DZ16F20 DZ27F20 — DZ16T20 DZ27T20 — 12 — D0Z18G20 10.9

25 Yellow DZ16F25 DZ27F25 — DZ16T25 DZ27T25 — 14 — D0Z18G25 12.1

35 Black — — DZ33F35 — — DZ33T35 16 — D0Z18G35 13.3

50 White — — DZ33F50 — — DZ33T50 18 — D0Z18G50 14.5

63 Copper — — DZ33F63 — — DZ33T63 20 — D0Z18G63 15.9

Base Size (mm) 16 27 33 16 27 33 — 14 18 —

36 36

21.5

D01 D02 DI DII DIII

13.2

Neozed Fuses Diazed Fuses

All dimensions are in “mm”

International Products

167

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International Products

Diazed/ Neozed Fuses

Fuse bases, carriers, and gauge rings are available for Diazed (DZ) and

Neozed (D0Z) type fuses. Fuse holders are comprised of a fuse base

and carrier. Optional gauge rings act as a rejection feature and are used

to prevent over-sizing of fuses. All bases and carriers are single pole

units. Contact factory for additional information.

Fuse Bases

Part No. Fuse Type Base Size (mm) Mounting Type

DZB27S DZ 27 Screw

DZB27DR DZ 27 Din Rail

DZB33S DZ 33 Screw

DZB33DR DZ 33 Din Rail

D0ZB14S D0Z 14 Screw

D0ZB14DR D0Z 14 Din Rail

D0ZB18S D0Z 18 Screw

D0ZB18DR D0Z 18 Din Rail

Fuse Carriers

Part No. Fuse Type Base Size (mm)

DZC27 DZ 27

DZC33 DZ 33

D0ZC14 D0Z 14

D0ZC18 D0Z 18

Gauge Rings

Amp

Rating Color DZ DZ D0Z D0Z

2PinkDZ27PK—D0Z14PKD0Z18PK

4BrownDZ27BR—D0Z14BRD0Z18BR

6 Green DZ27GN — D0Z14GN D0Z18GN

10 Red DZ27RD — D0Z14RD D0Z18RD

16 Grey DZ27GY — — D0Z18GY

20 Blue DZ27BE — — D0Z18BE

25 Yellow DZ27YW — — D0Z18YW

35 Black — DZ33BK — D0Z18BK

50 White — DZ33WE — D0Z18WE

63 Copper — DZ33CR — —

Contact factory for dimensional information.

International Products

168 www.littelfuse.com

International Products

Assembly kit is designed for use with

CYH1038 and LPSC/LPSM fuse holders.

Kit contains 20 connector pincers and 10

handle pins.

Part No: CYHP001

Cylindrical Fuses

500 Volts • 0.5 – 100 Amperes

Size Current Range Voltage AC Interrupting Rating

10 x 38 mm 0.5-32A 500V 120kA

14 x 51 mm 2-50A 500V 80kA

22 x 58 mm 16-100A 500V 80kA

gL-gG aM

Amperage 10X38 14X51 22X58 10X38 14X51 22X58

0.5 CY10X38G.5 — — CY10X38M.5 — —

1 CY10X38G1 — — CY10X38M1 — —

2 CY10X38G2 CY14X51G2 — CY10X38M2 CY14X51M2 —

4 CY10X38G4 CY14X51G4 — CY10X38M4 CY14X51M4 —

6 CY10X38G6 CY14X51G6 — CY10X38M6 CY14X51M6 —

8 CY10X38G8 CY14X51G8 — CY10X38M8 CY14X51M8 —

10 CY10X38G10 CY14X51G10 — CY10X38M10 CY14X51M10 —

12 CY10X38G12 CY14X51G12 — CY10X38M12 CY14X51M12 —

16 CY10X38G16 CY14X51G16 CY22X58G16 CY10X38M16 CY14X51M16 CY22X58M16

20 CY10X38G20 CY14X51G20 CY22X58G20 CY10X38M20 CY14X51M20 CY22X58M20

25 CY10X38G25 CY14X51G25 CY22X58G25 CY10X38M25 CY14X51M25 CY22X58M25

32 CY10X38G32 CY14X51G32 CY22X58G32 CY10X38M32 CY14X51M32 CY22X58M32

40 — CY14X51G40 CY22X58G40 — CY14X51M40 CY22X58M40

50 — CY14X51G50 CY22X58G50 — CY14X51M50 CY22X58M50

63——CY22X58G63——CY22X58M63

80 — — CY22X58G80 — — CY22X58M80

100 — — CY22X58G100 — — CY22X58M100

Dimensions

(mm)

A10 142210 14 22

B3851583851 58

Fuseholders Multi-pole Assembly Kit

Part No. Size # of Poles Amp Rating Voltage Terminal Type

CYH10381 10X38 1 32A 690V Pressure Plate

CYH10382 10X38 2 32A 690V Pressure Plate

CYH10383 10X38 3 32A 690V Pressure Plate

CYH10381ID* 10X38 1 32A 690V Pressure Plate

CYH14511 14X51 1 50A 690V Pressure Plate

CYH14512 14X51 2 50A 690V Pressure Plate

CYH14513 14X51 3 50A 690V Pressure Plate

CYH22581 22X58 1 125A 690V Pressure Plate

CYH22582 22X58 2 125A 690V Pressure Plate

CYH22583 22X58 3125A 690V Pressure Plate

* Indicating

NOTE: All fuseholders are DIN-Rail mountable.

Contact factory for dimensional information.

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: IEC 269-2-1

Example part number: CY22X58G50

International Products

169

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International Products

FIG. 1 FIG. 2

FIG. 3

British Dimension HRCII-C Fuses

600 Volts AC • 2 – 600 Amperes

Specifications

Voltage Rating: 600 Volts AC, 250 Volts DC

Interrupting Rating: 200,000 amperes rms symmetrical AC

80,000 amperes rms symmetrical DC

Ampere Range: 2 – 600 amperes

Approvals: CSA Certified to Standard C22.2 No. 106-M90

(File No. LR90341)

Ampere ratings

2CO 210255080

4153060100

62040

2CC 125 200 300 400 500

150 250 350 450 600

2CM 80 125 200 300 400

100 150 250 350

Example part number (series & amperage): 2CM 150

Recommended Fuse Blocks

DF30 (F, B, FB) — Fits 2 – 30 amps

DF60 (F, B, FB) — Fits 40 – 60 amps

DF100 (F, B, FB) — Fits 80 – 100 amps

For additional information on HRCII-C fuse holders, contact factory.

Cat. No. Old LF

Part No.

Refer To

Fig. No.

Dimensions in mm (inches in parentheses)

A BCD E F G H J K

2CO 2-30 FII 1 56 (2.2) 21 (0.83) — 85 (3.3) 9 (0.35) 1 (0.04) 73 (2.87) 5.5 (0.21) 7.5 (0.29) —

2CO 40-60 FII 1 57 (2.24) 26 (1.02) — 88 (3.45) 13 (0.51) 1.6 (0.06) 73 (2.87) 5.5 (0.21) 7.5 (0.29) —

2CO 80-100 FII 1 68 (2.88) 36 (1.42) — 110 (4.33) 19 (0.75) 2.4 (0.09) 94 (3.7) 8.7 (0.34) — —

2CC 125-200 FIIC 2 76 (3) 41 (1.61) — 137 (5.39) 19 (0.75) 3.6 (0.14) 111 (4.37) 8.7 (0.34) 16 (0.63) —

2CC 250-400 FIIC 3 81 (3.19) 58 (2.28) — 210 (8.27) 26 (1.02) 6.5 (0.26) 133 (5.24) 10.3 (0.4) 16 (0.63) 25.4 (1)

2CC 450-600 FIIC 3 83 (3.27) 74 (2.91) — 210 (8.27) 26 (1.02) 6.5 (0.25) 133 (5.24) 10.3 (0.4) 16 (0.63) 25.4 (1)

2CM 80-100 FIIM 2 66 (2.6) 31 (1.22) — 135 (5.31) 19 (0.75) 3.6 (0.14) 111 (4.37) 8.7 (0.34) 16 (0.63) —

2CM 125-200 FIIM 1 77 (3.03) 41 (1.81) — 110 (4.33) 19 (0.75) 2.4 (0.09) 94 (3.7) 8.7 (0.34) 10.3 (0.4) —

2CM 250-400 FIIM 2 81 (3.19) 58 (2.25) — 136 (5.35) 26 (1.02) 5.2 (0.2) 111 (4.37) 8.7 (0.34) 16 (0.63) —

*Hole diameter to accept insulated stud (types C and D) mm min

HRCII-C fuses are stud-mounted fuses designed to British standard

dimensions. They are generally used for motor short-circuit protection in

dead-front holders, and are normally required to be used in conjunction

with a motor running overload device.

Suppression Products

Overvoltage Suppression Products: Introduction 171-172

Industrial Varistor Products 173

Surge Suppression Fuses 174

Suppression Products

171

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Suppression

Overvoltage Suppression Products

Introduction

Voltage Current Rise-Time Duration

Lighting 25kV 20kA 10µs 1ms

Switching 600V 500A 50µs 500ms

EMP 1kV 10A 20ns 1ms

SSD 15kV 30A 1-5ns 100ns

Overvoltage conditions are rapidly becoming an increasing concern

in the electrical industry. Component miniaturization has resulted in

increased sensitivity to many devices as the trend towards downsizing

equipment and components continues. The majority of these devices

are unable to handle high currents that result from Electrostatic

Discharge (ESD) and other voltage transients.

Did you know?

• 75% of field equipment failure is caused by

Electrical Over-Stress (EOS)

• Semiconductor devices are becoming increasingly

intolerant to voltage transients

• A lightning strike several miles away can induce

transients in your equipment

• Power distribution transformers susceptibility

impacts clean power condition

What Are Transients?

Voltage Transients are defined as short duration surges of electrical

energy. Transients 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.

Transients occur in either repeatable fashion or as random impulses.

Repeatable transients are frequently caused by the operation of motors,

generators, or the switching of reactive circuit components. Random

transients, on the other hand, are often caused by lightning and ESD.

Lightning and ESD generally occur unpredictably, and may require

elaborate monitoring to be accurately measured.

Transient Sources and Magnitude

Typical Overvoltage Applications

Industrial, High Energy AC Products

(Solenoids, Motor Drives, Robotics, etc.)

Telecommunications Products

TVSS Products (UPS, AC Panels, Power Supplies,

Circuit Breakers, etc.)

Portable Electronic Equipment

Automotive Electronics

Suppression Products

172 www.littelfuse.com

Suppression

Overvoltage Suppression Products

Introduction

Transient Voltage Scenarios

The switching of inductive loads generates high energy transients

which 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.

Typical sources of inductive transients are:

• Generator

• Motor

• Relay

• Transformer

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.

ESD (Electrostatic Discharge)

Electrostatic discharge is characterized by very fast rise times and

very high peak voltages and currents. This energy is the result of an

imbalance of positive and negative charges between objects.

Lightning Induced Transients

Even though a direct strike is clearly destructive, 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.

Technological Solutions for Transient Threats

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. Our overvoltage protection portfolio includes:

MOVs

Metal Oxide Varistors (MOV)

Ceramic Technology

Available in screw terminal, radial, square and axial leaded connections.

Offers medium to very high energy ratings for a wide range of

applications.

Surface Mount MOV

Metal Oxide Varistor (MOV)

Ceramic Technology

Available in a wide range of voltage ratings. Offers low to medium

energy ratings for a variety of applications and is available with screw

terminal, radial, square and axial leaded connections.

MLV

Multilayer Metal Oxide Varistor

Ceramic Technology

Available in a wide range of surface mount packages. Offers a lower voltage

range and enhanced performance and filtering characteristics for applications

requiring protection from low to medium energy transients.

PulseGuard® Suppressor

Voltage Variable Polymer Technology

Available in surface mount and ‘D-Sub connector’ format packages.

Specifically designed for high data-rate applications requiring ESD

protection and the lowest possible capacitance.

TVS Diode Arrays

Silicon Avalanche Diode Technology

Available in surface mount multi-pin packages or CSP (chip scale

package) arrays. Designed for applications requiring multiline ESD

protection and the lowest possible clamp voltage.

Discrete TVS Diode

Silicon Avalanche Diode Technology

Available in surface mount and axial leaded packages. Offers protection

from medium to very high energy transients and can be used in wide

range of applications.

SIDACTOR® Thyristor

Thyristor Breakover Technology

Available in surface mount, axial leaded and TO-220 through hole

package options. Offers protection from medium to high energy

transients, SIDACTOR thyristors are specifically designed for transient

suppression in telecom and data transmission systems.

Gas Plasma Protector/Gas Discharge Tube

Gas Plasma Technology

Available in surface mount, axial leaded, radial leaded and special

packages. The Littelfuse Gas Plasma technology offers high surge

ratings and very low capacitance for use in telecommunication and

broadband systems.

Suppression Products

173

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Suppression

CH Series

14-275 VAC

18-369 VDC

250-500A

1-23J

Surface Mount

N/A

Overvoltage Suppression Products

Industrial Varistor Products

Operating Voltage:

Peak Current:

Peak Energy:

Mount/Form Factor:

Disc Size:

Indicating:

TMOV™/iTMOV™

Varistor Series

115-420 VAC

170-420 VDC

6,000-10,000A

50-320

Radial Leaded

14, 20mm

iTMOV Varistor Only

UltraMov™

Varistor Series

130-625 VAC

170-825 VDC

1,750-10,000A

50-273J

Radial Leaded

7, 10, 14, 20mm

N/A

C-III Series

130-320 VAC

6,000-9,000A

45-220J

Radial Leaded

14, 20mm

N/A

LA Series

130-1000 VAC

175-1200 VDC

1,200-6,500A

11-360J

Radial Leaded

7, 10, 14, 20mm

N/A

®

MA Series

9-264 VAC

13-365 VDC

40-100A

0.06-1.7J

Axial Leaded

3mm

RA Series

4-275 VAC

5.5-369 VDC

150-6,500A

0.4-140J

Packaged

8, 6, 22mm

CA Series

250-2800 VAC

330-3500 VDC

20,000-70,000A

200-10,000J

Bare Disc

32, 40, 60mm

NA Series

250-750 VAC

330-970 VDC

40,000A

370-1,050J

Bare Disc

34mm

®

PA Series

130-660 VAC

175-850 VDC

6,500A

70-250J

Packaged

20mm

HB34 Series

130-750 VAC

175-970 VDC

40,000A

270-1,050J

Industrial Packaged

34mm

HA Series

130-750 VAC

175-970 VDC

25,000-40,000A

200-1,050J

Packaged

32, 40mm

DA/DB Series

130-970 VAC

175-970 VDC

40,000A

270-1,050J

Industrial Packaged

40mm

BB/BA Series

130-2800 VAC

175-3500 VDC

50,000-70,000A

450-10,000J

Packaged

60mm

®

ZA Series

4-460 VAC

5.5-615 VDC

50-6,500A

0.1-52J

Radial Leaded

5, 7, 10, 14, 20mm

N/A

®

D E

®

D E

®

D E

®

D E

®

D E

®

Operating Voltage:

Peak Current:

Peak Energy:

Mount/Form Factor:

Disc Size:

Operating Voltage:

Peak Current:

Peak Energy:

Mount/Form Factor:

Disc Size:

Contact factory for additional information.

Suppression Products

174 www.littelfuse.com

Suppression

Features

• 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, TMOVTM and

iTMOVTM varistors as well as the AK-10 series TVS diodes).

Applications

• TVSS products

• Surge arrestors

Overvoltage Suppression Products

Surge Suppression Fuses

SYMMETRICAL R.M.S. AMPERES

AVAILABLE FAULT CURRENT

PEAK LET-THRU IN AMPERES

LVSP

The Littelfuse Varistor Protection ( LVSP) Fuses are intended for the

protection of TVSS products. The LVSP series has been designed to

survive the 8x20µs lightning surges described in various standards

(UL1449, IEC61000-4-5 & 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 8x20µs 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 No. 8x20µs

Surge Rating

Nominal

Melting I2t

(A2s)

Nominal

Clearing I2t

(A2s)

Ipeak@100kA

60Hz (A)

LVSP 5 5,000 359 981 3,700

LVSP 10 10,000 1,300 3,210 5,823

LVSP 15 15,000 3,267 6,235 7,765

LVSP 20 20,000 4,940 11,710 8,135

LVSP 30 30,000 11,950 35,325 12,478

LVSP 40 40,000 20,550 61,700 15,250

LVSP 60 60,000 39,240 145,555 19,604

LVSP 80 80,000 75,000 254,000 24,600

LVSP 100 100,000 Contact Factory

Note: Contact factory for dimensions and availability of specific mounting

configurations.

Specifications

Voltage Rating: 600 VAC

Interrupting Rating: 200,000 amps

Ratings: 5 – 100kA 8x20µs surge withstand

Approvals: UL Recognized under the components program.

(File No. E71611)

Recommended Fuse Blocks

L60030M and LPSM series – LVSP (5-20)-2

LJ60030 and LPSJ30 series – LVSP (30-80)-2

Mounting Options

Surge Rating Catalog Number

Cartridge Leaded Bolt-In

5 LVSP 5-2 LVSP 5-R –

10 LVSP 10-2 LVSP 10-R –

15 LVSP 15-2 LVSP 15-R –

20 LVSP 20-2 LVSP 20-R –

30 LVSP 30-2 – LVSP 30

40 LVSP 40-2 – LVSP 40

60 LVSP 60-2 – LVSP 60

80 LVSP 80-2 – LVSP 80

100 – – LVSP 100-L

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Fuseology

Terms and Definitions 177-181

Electrical Safety Guide 182-183

Fuse Application Guide 184-203

Motor Protection Tables 204-206

Condensed Cross Reference 207

Alphanumeric Index 208

Fuseology

176 www.littelfuse.com

Fuseology

Introduction

Fuseology provides the information needed to choose the correct

types of Littelfuse POWR-GARD™ fuses for most applications.

Definition of Terms is followed by Overcurrent Protection

Fundamentals. 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)

or visit us online at www.littelfuse.com/technicalcenter.

Call 1-800-TEC-FUSE for

Technical Support and

Engineering Services or visit

www.littelfuse.com/technicalcenter

Definitions 177–181

Electrical Safety 182-183

Overcurrent Protection Fundamentals

(Fuses and How They Work) Index 184

Why Overcurrent Protection 184

What is Quality Overcurrent Protection 184

Overcurrent Types and Effects 184

Fuse Characteristics (600 volts and below) 185

Time-Current Characteristics 186-187

Peak Let-through Charts 187-189

Fuse Ampere Ratings 189

Fuse Dimensions 189

Fuse Coordination (Developing a Selective System) 190-191

Component Short-circuit Protecting Ability 190

UL/CSA Fuse Classes and Their Applications 192-193

Fuses for Specific Applications

(600 Volts and Below) Index 194

Protecting Service Entrance and Feeder Conductors 194

Main Services and Feeders 194

Motor Protection 194-198

Motor Overload Protection (running overcurrent) 195-197

Motor Feeder (100% Motor Load) Protection over 600A 197

Motor Branch Circuit Protection over 600A 197

Motor Controller (Starter) Protection over 600A 197

Control Transformer Protection 197-198

Primary Fusing With Secondary Fusing 198

Secondary Fusing of Transformers 198

Lighting Fixture Protection 198

Street Lighting & Other Weatherproof Overcurrent Protection 198

Cable Short-circuit Protection (Cable Limiter Application) 199

Semiconductor and Solid-state Device Protection 199

Effect of Ambient Temperature on Fuses 199

Medium Voltage Protection (2400 volts to 38.0 kV) 200-203

Motor Protection Tables 204-206

Fuseology

177

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Fuseology

Fuse Application Guide

Definitions

AIC or A.I.C.

See Interrupting Capacity.

AIR or A.I.R.

See Interrupting Rating.

Ambient Temperature

The air temperature surrounding a device. For fuses or circuit breakers in

an enclosure, the air temperature within the enclosure.

Ampacity

The current in amperes that a conductor can carry con tin u ous ly under

the conditions of use without exceeding its tem per a ture rating. It is

sometimes informally applied to switches or other devices. These are

more properly referred to by their ampere rating.

Ampere Rating

The current rating, in amperes, that is marked on fuses, circuit breakers,

or other equipment.

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.

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 melting time in seconds. For times less than 0.004

seconds, melting I2t approaches a constant value for a given fuse.

Arcing I2t is the heat energy passed by a fuse during its arcing time.

It is equal to the rms arcing current squared (see below), multiplied by

arcing time.

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 com plete ly interrupted. Clearing I2t is the sum of the

Melting I2t and the Arcing I2t.

Arc-Flash

The suddent 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.

Arcing Current (See Figure 1)

The current that flows through the fuse after the fuse link has melted

and until the circuit is interrupted.

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.

Arcing Time (See Figure 1)

The time between the melting of a fuse link, or parting of circuit breaker

contacts, until the overcurrent is interrupted.

Arc Voltage (See Figure 2)

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), rarely as rms voltage.

Asymmetrical Current

See Symmetrical Current.

Available Short-Circuit Current

(also Available or Pro spec tive 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.

Blade Fuse

See Knife Blade Fuse.

Body

The part of a fuse enclosing the fuse elements and supporting the

contacts. Body is also referred to as cartridge, tube, or case.

INSTANTANEOUS ARC VOLTAGE

183% OF CYCLEPEAK

RESTORED VOLTAGE

PEAK

Figure 2

Figure 1

Showing arcing and melting currents and arcing, melting and clearing times.

Peak Let-through Current

Peak Current which would occur

without current limitation

Current

Time

Melting

Time

Arcing

Current

Arcing

Time

Melting

Current

Arcing Energy (l2t)

Melting Energy (l2t)

Definition of Terms Frequently Used

When Selecting Overcurrent Pro tec tion

Fuseology

178 www.littelfuse.com

Fuseology

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. Ex am ples of bolted faults are a heavy wrench lying across two

bare bus bars, or a crossed-phase condition due to incorrect wiring.

Cartridge Fuse

A fuse that contains a current-re spon sive element inside a tubular fuse

body with cylindrical ferrules (endcaps).

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 di men sions 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-GARDTM fuses.

Clearing I2t

See Ampere-Square-Seconds (I2t).

Clearing Time (see Figure 1)

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.

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.

Coordination or Coordinated System

See Selective Coordination.

Continuous Load

An electrical load where the maximum current is expected to continue

for 3 hours or more.

Current-limiting Fuse (See Figure 3)

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 fuseblock or fuseholder that has either a

rejection feature or dimensions that will reject non-current-limiting fuses.

Current-limiting Range

For an individual overcurrent protective device, the current-limiting range

begins at the lowest value of rms sym met ri cal current at which the

device becomes current-limiting (the threshold current) and extends

to the max i mum interrupting capacity of the device. See definitions of

Threshold Current and Interrupting Capacity.

Current Rating

See Ampere Rating.

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.

Element

A fuse’s internal current-carrying parts that melt and interrupt the

current when subjected to an overcurrent of sufficient duration or value.

Also called fuse link.

Fast-Acting Fuse

May also be termed Normal-opening fuse.

A fuse that has no intentional, built-in, time delay. Actual opening time

is determined by the fuse class, the over cur rent, and other conditions.

Fast-acting is indicated on the fuse label by “Fast-Acting”, “F-A”, “F”, or

other suitable marking.

Fault

Same as Short-Circuit and used interchangeably.

Fault Current

Same as Short-Circuit current.

Filler

A material, such as granular quartz, used to fill a section or sections of a

fuse and aid in arc quench ing.

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 in ter-

rupt ing current flow by melting during specified overcurrent conditions.

Ground Fault

A short-circuit caused by insulation breakdown between a phase

conductor and a grounded object or conductor.

I2t

See Ampere-Squared-Seconds (I2t).

IEC Type 2 Protection

Fused protection for control components that prevents damage to these

Current

Time

Fault occurs

Arc is extinguished

Current which

would flow if

not interrupted

Current before fault

Fuse opens and

clears short circuit

in less than ½cycle

Fuse Application Guide

Definitions

Figure 3

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Fuse Application Guide

Definitions

components under short-circuit con di tions. A more complete discussion

of this subject is included in the Motor and Motor Circuit Protection

Section. See definition of No Damage.

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.

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.

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.

Inverse-time Characteristics

A term describing protective devices whose opening time decreases

with increasing current.

IR or I.R. (also AIR or A.I.R.)

See Interrupting Rating above.

Kiloamperes (kA)

1,000 amperes.

Knife Blade Fuse

Cylindrical or square body fuses with flat blade terminals ex tend ing 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.

Melting Current (see Figure 1)

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).

Melting Time (see Figure 1)

The time span from the initiation of an overcurrent con di tion to the

instant arcing begins inside the fuse.

NEC

In general, the National Electrical Code® (NEC®). Spe cif i cal ly, as

referenced herein, NEC refers to NFPA Standard 70, National Electrical

Code®, National Fire Protection Association, Quincy, MA 02269.

Sections of the NEC reprinted herein, and/or quo ta tions therefrom, are

done so with permission. The quoted and reprinted sections are not

the official position of the National Fire Protection Association, which is

rep re sent ed 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.

No Damage

A term describing the requirement that a system com po nent be in

essentially the same condition after the oc cur rence of a short-circuit as

prior to the short-circuit.

Non-renewable Fuse

A fuse that must be replaced after it has opened due to an overcurrent.

It cannot be restored to service.

Normal-opening Fuse

See Fast-Acting Fuse.

One-time Fuse

Technically, any non-renewable fuse. However, the term usually refers

to UL Class H fuses and to fast acting 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.

Overcurrent

Any current larger than the equipment, conductor, or devices are rated

to carry under specified conditions.

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 later in this Fuseology section.

Peak Let-through Current (See Figure 4)

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.

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

Peak Let-through Current

Peak Current which would occur

without current limitation

Current

Time

Figure 4

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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 asym met ri cal 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.

Prospective Current

See Available Short-Circuit Current.

Rating

A designated limit of operating characteristics based on definite

conditions such as current rating, voltage rating and interrupting rating.

Rectifier Fuse

See Semi con duc tor Fuse.

Rejection Feature

The physical characteristics of a fuse block or fuseholder that prevents

the insertion of a fuse unless it has mating characteristics. This may

be done 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.

Renewable Element (also Renewable Link)

A renewable fuse current-carrying part 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.

Selective Coordination (See Figure 5)

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

equipment or short-circuits. For additional information, refer to the Fuse

Coordination pages of this Fuseology section.

Semiconductor Fuse

A fuse specifically designed to protect semiconductors such as silicon

rectifiers, silicon-controlled rectifiers, thyristers, transistors, and similar

components. For additional information, refer to the Semiconductor

Section of this catalog.

Short-Circuit (See Figure 6)

A current flowing outside its normal path. It is caused by a breakdown of

insulation or by faulty equipment con nec tions. 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.

Short-Circuit Rating

The maximum RMS symmetrical short-circuit 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.

Most short-circuit ratings are based on tests which last three 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.

When so protected during testing, the equipment in struc tions 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.

Figure 5

URRENT FL

GEN.

LOAD

Accidental

connection

creates fault

GEN.

LOAD

In a "normal" circuit,

current is determined by

load IMPEDANCE

(Heavy lines indicate

increased current)

In a short-circuit, current is limited

only by impedance of fault path.

Current may increase to many times

load current.

In a selective system:

For a fault at "X" only fuse "C" will open.

For a fault at "Y" only fuse "F" will open.

BCDE

FGHJ

Figure 6

Fuse Application Guide

Definitions

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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.

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 7. If the peak currents are not equal, as

shown in Figure 8, the current is 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.

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 thresh old

current can be determined from the fuse’s peak let-through charts.

See Figure 9.

Threshold Ratio

The threshold current divided by the ampere rating of a specific type or

class overcurrent device. A fuse with a threshold ratio of 15 becomes

current-limiting at 15 times its current rating.

Time-Delay Fuse

Fuses that have an intentional, built-in delay in opening. When compared

to fast-opening fuses, time-delay 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 over cur rents.

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.

Time-delay Class CC, CD, G, Plug, and Miscellaneous fuses have

different requirements. See the corresponding descriptions given in the

Product Information Section.

For the UL Standard, Class L fuses have no standard time-delay. The

time-delay varies from type to type for a given manufacturer, as well

as from manufacturer to manufacturer. For reference, Littelfuse KLPC

series POWR-PRO® fuses do hold 500% of rated current for a minimum

of ten seconds.

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.

Withstand Rating

See Short-Circuit.

1000

4000

Fuse approximate

threshold current = 4000A

Peak let-through current

Available Fault Current Symmetrical RMS Amperes

Peak Let-Through in Amperes

Equal

Peaks

Zero Axis

Fuse Application Guide

Definitions

Figure 7

Symmetrical Current

Figure 8

Asymmetrical Current

Figure 9

Unequal

Peaks

Zero Axis

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Electrical Safety Guide

Electrical safety is an important issue for employers and employees

alike. Unfortunately there are still about 30,000 electrical accidents

occurring each year, each of them potentially costing up to $15 million,

and the number is increasing.

OSHA requires all employers to perform a hazard assessment of their

facilities and train their employees to become qualified to perform a

specific task. Being aware, following safety regulations, codes and

standards, and using protective devices will minimize hazards and help

establish safer work practices.

OSHA Standard 29 CFR Part 1910 Subpart S (electrical)

generally addresses safety standards, work practices, and maintenance

requirements.

NFPA 70E Standard for Electrical Safety in the Workplace

concentrates on safety requirements to protect employees. OSHA

commonly is referred to as the “Shall” and NFPA 70E as the “How”

with regards to electrical safety.

Both OSHA and NFPA 70E reinforce the need for Electrical

Hazard Analysis.

The analysis should address all potential electrical hazards including

shock, Arc-Flash, Arc-Blast, and burns. NFPA 70E Article 110.8(B)(1)

specifically requires Electrical Hazard Analysis within all areas of the

electrical system that operate at 50 volts or greater. The results of the

Electrical Hazard Analysis will determine the work practices, protection

boundaries, personal protective equipment to be used, and other

procedures to protect employees from an Arc-Flash or contact with live

conductors.

Implementing and following a well designed Electrical Safety

Program will protect employees and employers against:

• Injury to personnel

• Increased insurance and workman compensation

• Lost or unusable materials

• Unplanned equipment repair or replacement

• OSHA citations and fines

• Multi-million dollar lawsuits

• Possible bankruptcy

Electrical Safety is not an option; it is absolutely necessary for

both workers and employers.

FACTS

• There are approximately 30,000 electrical shock accidents every year.

• Over 3600 disabling electrical contact injuries occur annually.

• Over 2000 workers are sent to burn centers each year with severe Arc-Flash burns.

• Over 1000 electrical workers die each year from workplace accidents.

• 60% of workplace accident deaths are caused by burn injuries.

• Electrocutions are the 4th leading cause of traumatic occupational fatalities.

• Estimates show that 10 Arc-Flash incidents occur every day in the U.S.

• 97% of all electricians have been shocked or injured on the job.

• Medical costs per person can exceed $4 million for severe electrical burns.

• Total costs per electrical incident can exceed $15 million.

• In the year 2002, work injuries cost Americans $146.6 billion.

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The following is a brief overview of requirements for working on electrical equipment.

NOTE: Only the complete standards constitute the law or regulation and all parts must be followed where applicable.

Understand and follow NFPA and OSHA

guidelines

Allow only “Qualified” individuals to perform work. Qualified

workers must be knowledgeable on the equipment and the

hazards that exist and receive documented training. For more

information refer to OSHA 1910.332 and NFPA 70E Article

110 .6 ( D ) (1) .

Establish a “Safe Work Condition” and work on system

components de-energized whenever possible. Consult NFPA

70E Article 120.1 for establishing an Electrically Safe Work

Condition.

Develop an Electrical Safety Program

Determine available fault currents and hazard risks at points

where there is the potential for contact with an energized

part. In many cases, this requires a complete Hazard Risk

Assessment. As a result, the entire electrical system is

analyzed and the one-line diagram for the facility is reviewed

and updated. The outcome is used to determine the Hazard

Risk Category (0 to 4), required level of PPE, Protection

Boundaries and equipment that requires warning labels. Refer

to OSHA 1910.132(d) and NFPA 70E Article 110.8(B)(1) for

more information on Electrical Hazard Analysis.

Establish an Electrical Safety Program.

It should control and re-engineer the processes in the

workplace to insure Electrical Safety including: hazard

assessments, labeling of equipment, training programs,

energized work permits and using current-limiting devices to

minimize hazards. Refer to NFPA 70E Article 110.7 for more

information on establishing an Electrical Safety Program.

Develop formal training for equipment operators, service

technicians and any other employees that might come in

contact with the identified hazard. “Qualify” them for hazard

preparations and contingencies (preparations prior to servicing

electrical systems or coming within boundaries of electrical

hazards). For more information refer to OSHA 1910.332 and

NFPA 70E Article 110.6.

Communicate the hazards to employees

Train your employees.

Label equipment and service entrances of the “Hazards

Assessed.” Refer to NEC Article 110.16 for Warning Label

Requirements.

Create a safety culture and support safety processes and

awareness such as: Deenergize and Verify, “Test Before

Touch”, Lockout / Tagout, the proper use of PPE and insulated

tools, providing barriers to warn and restrict access to

unqualified personnel, etc.

Select the safest circuit protection

devices to minimize electrical hazards

Electrical Safety Guide

Bus: SERVICE4 05/12/05

42 inches 12 inches 1 inch

1 480 VAC

35 kA

32 inches

2.77 cal/cm2

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Fuse Application Guide

Overcurrent Protection Fundamentals

Introduction

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 and Engineering Services Group at 1-800-TEC-FUSE

(1-800-832-3873). Definitions of terms used in this section are located

in the preceding section.

INDEX Page

Why Overcurrent Protection? ..................................................184

What is Quality Overcurrent Protection? .............................184

Overcurrents, Types and Effects .............................................184

Overloads ..............................................................................184

Short-Circuits ......................................................................185

Fuse Characteristics (600 volts and below) .............................185

Voltage Rating ..................................................................... 18 5

Interrupting Rating ............................................................185-186

300,000 AIC Fuses ........................................................186

Time Current Characteristics ...................................................186

Overloads ..............................................................................186

Fast-Acting Fuses ..........................................................186

Time-Delay (Dual-Element) Fuses ...............................186

Very Fast-Acting Fuses .................................................187

Short Circuits .......................................................................187

Current-Limiting Fuses ..................................................187

Fast-Acting Fuses ..........................................................187

Dual-Element (Time-Delay) Fuses ...............................187

Very Fast-Acting Fuses .................................................187

Time-current Curves .........................................................187

Peak Let-through Charts............................................................187

Using the Peak Let-through Charts

(“up-over-and-down”) ............................................................188-189

Fuse Ampere (current) Ratings ...............................................189

Fuse Dimensions .........................................................................189

Fuse Coordination, Selective Systems .................................190-191

Component Short-circuit Protecting Ability .......................190

UL/CSA Fuse Classes and Their Applications ....................192-193

Why Overcurrent Protection?

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. They

can pull cables from their terminals and crack insulators and spacers.

Too frequently, fires, explosions, poisonous fumes and panic accompany

uncontrolled overcurrents. They not only damage electrical systems and

equipment, but may cause injury or death to personnel.

To reduce these hazards, the National Electrical Code® (NEC®), OSHA

regulations, and other applicable design and in stal la tion standards require

overcurrent protection that will disconnect overloaded or faulted equipment.

Industry and governmental organizations have developed performance

standards for overcurrent devices and testing pro ce dures that show

compliance with the standards and with the NEC. These organizations

include: the American National Stan dards Institute (ANSI), National

Electrical Man u fac tur ers Association (NEMA), and the National Fire

Protec tion Association (NFPA) working with Nationally Recognized

Testing Laboratories (NRTL) such as Un der writ ers Lab o ra to ries (UL).

Electrical systems must meet applicable code re quire ments including

those for overcurrent protection before electric util i ties can 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, ex ceed ing minimum code

requirements as necessary.

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.

5. Is cost effective. Provides reserve interrupting capacity for

future growth. Not subject to obsolescence. Re quires minimum

maintenance that can be done by regular maintenance personnel

using readily available tools and equipment.

Overcurrent Types and Effects

An overcurrent is any current that exceeds the ampere rat ing of

conductors, equipment, or devices under con di tions of use. The term

“overcurrent” includes both over loads and short-circuits.

Overloads

An overload is an overcurrent that is confined to normal current paths.

There is no insulation breakdown.

Sustained overloads are commonly caused by installing excessive

equipment such as additional lighting fixtures. They are also caused by

overloading mechanical equipment and by equipment breakdown such

as failed bear ings. If not disconnected within established time limits,

sustained overloads eventually overheat circuit com po nents causing

thermal damage to insulation and other system components.

Overcurrent protective devices must disconnect circuits and equipment

experiencing continuous or sustained overloads before overheating

occurs. Even moderate insulation overheating seriously reduces its life.

For example, motors overloaded by only 15% may have less than 50%

insulation life.

Temporar y overloads occur frequently. They may be caused by

temporary equipment overloads such as a machine tool taking too deep

of a cut, or may result from starting inductive loads, such as motors.

Since temporary overloads are, by definition, harmless, over cur rent

protective devices should not open the circuit.

Fuses selected must have sufficient time-delay to allow motors to start

Overcurrent Protection Fun da men tals (Fuses and How They Work)

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and temporary overloads to subside. However, should the overcurrent

continue, fuses must open before system components are damaged.

Littelfuse POWR-PRO® and POWR-GARDTM time-delay fuses are

designed to meet these needs. They hold 500% current for a minimum

of ten seconds, yet open quickly on higher values of current. 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.

Short-Circuits

Types of Short- Circuits

Short-circuits are divided into bolted faults, arcing faults

and ground faults. Each are defined in the Definition section.

Causes of Short-Circuits

A short-circuit is current flowing outside of its normal path. It is caused

by an insulation breakdown or faulty connection. During a circuit’s

normal operation, the connected load determines current. During a

short-circuit, the current bypasses load and the current takes a “shorter

path,” hence: short-circuit. Since there is no load impedance, only the

total distribution system’s impedance from the utility’s generators to

the fault will limit current flow. See Figure 6.

Many elec tri cal sys tems have single-phase impedance of 0.005 ohms

or less. Ap ply ing Ohm’s Law (I = E/Z for AC systems), a 480 volt single-

phase circuit with a ten ohm load impedance would draw 48 amperes

(480/10 = 48). If, when the load is shorted, the same circuit has a 0.005

ohm system impedance, the available fault current would be 96,000

amperes (480/0.005 = 96,000). Short-circuits are currents out of their

normal path and regardless of their value, they must be removed

quickly.

Effects of Short-Circuit Currents

If not removed quickly, the large currents associated with short-circuits

may have three profound effects on an electrical system: heating,

magnetic stress, and arcing.

Heating. Current passing through an electrical system heats every

part of it. 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. If the current could be reduced

to 1,000 amperes for the same period of time, I2t would be reduced

to 10,000 — only one percent of the original value. 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 tem per a ture of 150°C.

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.

Magnetic stress. 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. These stresses may injure

insulation, pull con duc tors from terminals, and stress equipment

terminals sufficiently to cause damage.

Arcing. Arcing at the point of fault melts and vaporizes the conductors

and com po nents involved in the fault. The arcs often burn through

raceways and equipment enclosures show er ing the area with molten

metal that quickly starts fires and/or injures 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. These vapors may explode or burn.

Fuse characteristics (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

need to be evaluated:

Voltage Rating

Fuse voltage ratings must equal or exceed the circuit voltage where the

fuses will be installed, and fuses used in DC circuits must be rated for DC.

Exceeding the voltage ratings or using an AC only fuse in a DC circuit could

result in violent destruction of the fuse. Standard 600 volt and below fuses

may be applied at any voltage less than their rating. For example, a 600

volt fuse may be used in a 277 volt or even a 32 volt system.

NOTE: This does not apply to semiconductor fuses and medium

voltage fuses. See the semiconductor and medium voltage fuse

application data later in this section for voltage limitations of these fuses.

UL Listed low-voltage power fuses are available with AC voltage ratings

of 125, 250, 300, 480, and 600 volts, and DC voltage ratings of 60, 125,

160, 250, 300, 400, 500, and 600 volts. Fuses may be rated for AC

only or DC only, or they may have both an AC and a DC voltage rating.

Supplementary fuses have voltage ratings from 32 to 1,000 volts AC

and/or DC.

300 volt Class T fuses (Littelfuse JLLN series) may only be used for

single-phase to neutral loads where the voltage does not exceed 300

volts to ground. They may not be used in three-phase, four wire, 480/277

volt, wye systems or in 480 volt corner-grounded delta systems.

Interrupting Rating

A fuse’s interrupting rating is the highest available sym met ri cal rms

alternating current that the fuse is required to safely interrupt at rated

voltage under standardized test conditions without being damaged. A

fuse must interrupt all overcurrents up to its interrupting rating. Fuses

are available with interrupting ratings of 10,000A, 50,000A, 100,000A,

200,000A, and 300,000A.

NEC Article 110.9 requires all equipment intended to break current at

fault levels to have an interrupting rating sufficient for system voltage

and current available at the equipment’s line terminals. Refer to Figure

10. Select fuses with interrupting ratings which equal or exceed the avail-

able fault current.

Standardizing on fuses with at least a 200,000 ampere interrupting

capacity (AIR) ensures that all fuses have an adequate interrupting

Fuse Application Guide

Overcurrent Protection Fundamentals

Fuseology

186 www.littelfuse.com

Fuseology

rating, and provides reserve in ter rupt ing capacity for future increases in

available fault current.

300,000 AIC Fuses

Littelfuse POWR-PRO® fuse series have a Littelfuse Self-Certified

interrupting rating of 300,000 amperes rms symmetrical. The 300,000

ampere testing was performed in a Nationally Recognized Testing Lab-

o ra to ry, 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.

Littelfuse feels that the “Special Purpose Fuse” clas si fi ca tion adds

confusion to specification writing for both fuses and switches and

com pli cates fuse pro cure ment. Since only a very small number of

installations have a real need for fuses with interrupting ratings in excess

of 200,000 amperes, Littelfuse will continue to UL List their fuses by

UL standard fuse classes that have in ter rupt ing ratings up to 200,000

amperes. Littelfuse fuses which have passed the 300,000 ampere tests

are marked on the label: “300kA (Self certified by Littelfuse)”. UL listing

cards showing 300,000 AIC and the special purpose classification are

available on request. Refer to the product section of this catalog for

information on specific fuse classes.

Time Current Characteristics

Time current characteristics determine how fast a fuse responds to

overcurrents. All fuses have inverse time characteristics; that is, the fuse

opening time de creas es as the value of overcurrent increases. When

properly rated in ac cor dance with NEC re quire ments, fuses provide

both overload and short-circuit protection to system con duc tors 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 pro tec tion, fuses provide only short-circuit protection.

A fuse’s response to over cur rents is divided into overloads and short-

circuits.

Overloads

While fuses must disconnect overloaded conductors and equipment

before the conductors and components are se ri ous ly overheated,

they should not disconnect harmless temporary over loads. To provide

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® (NEC®) must meet these limits whether they are fast-

acting or time-delay fuses.

Fast-Acting (Normal-Opening) Fuses

Fastoacting fuses (sometimes called “Normal-opening fuses”) have no

in ten tion al time-delay. Typical opening times at 500% of the fuse ampere

rating range from 0.05 to approximately 2 seconds. Fast-Acting fuses

are suitable for non-inductive loads, such as in can des cent 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. They provide only short-circuit pro-

tec tion. Over load relays or other overload protection must be provided to

protect con duc tors and equipment from overload conditions.

Time-Delay (Dual El e ment) Fuses

UL Classes CC, CD, G, H, L, RK5 and RK1 fuses, plus some of the

UL Listed Miscellaneous fuses, may have time-delay. If so, they are

identified on the fuse label with “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-GARDTM Fuses Products series IDSR, FLNR_ID, and FLSR_ID

(UL Class RK5), LLNRK, LLSRK, LLSRK_ID (UL Class RK1), and JTD,

JTD_ID (UL Class J) fuses require them 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) require them to carry 200% rated

current for a minimum of 12 seconds.

Although there is no UL Classification for time-delay Class L fuses, they

may be marked “Time-Delay.” The amount of time-delay is determined

by the man u fac tur er. POWR-PRO® KLPC series and POWR-GARD

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 (0.008 seconds). Time-delay fuses provide the best overall

protection for both motor and general purpose circuits, and eliminate

nuisance fuse opening and most downtime.

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, RK5 and RK1 fuses can be rated at 125-150% of

a motor’s full load current (FLA). This provides superior overload and

short-circuit protection, and often permits using smaller, less expensive

switches. Time-delay fuses have gradually replaced most one-time and

re new able fuses. Today, more than 50% of all fuses sold by electrical

distributors are time-delay fuses such as Littelfuse POWR-PRO LLSRK_ID

series fuses.

Fuse Application Guide

Overcurrent Protection Fundamentals

Main Switchboard

Available fault

Current = 125,000A

Available fault

Current = 85,000A

All fuses in main switchboard

must have an A.I.R. of at least

125,000A. Next higher standard

rating is 200,000A.

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 10

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Fuseology

Very Fast-Acting Fuses

The principle use of very fast acting fuses is to protect solid-state

electronic components, such as semi con ductors. Their special

characteristics, including quick overload response, very low I2t, Ipeak

and peak transient voltages provide protection for components that

cannot withstand line surges, low value overloads, or short-circuit

currents.

Short-Circuits

A fuse’s short-circuit response is its opening time on higher-value

currents. For power fuses, that is generally over 500 – 600% of

the fuse’s rating. As stated earlier, all fuses have inverse time

characteristics: the higher the current, the faster the opening time. Since

short-circuits should be removed quickly, inverse time is especially

important for short-circuit protection.

Current-limiting Fuses

Current-limiting fuses must have the following character istics:

1. Limit peak currents to values less than those which would occur

if the fuses were replaced with solid conductors of the same

impedance. This reduced peak current is referred to as a fuse’s “Peak

Let-through Current.”

2. When the fault current exceeds the fuse threshold current, the fuse

must open the circuit in less than 180 electrical degrees (1/2 cycle)

after the start of the fault.

3. Matching fuse holders and/or fuse blocks must reject non-current-

limiting fuses and accept only current-limiting fuses of the stated

UL Class.

Fast-Acting (Normal Opening) Fuses

All fast-acting fuses provide fast short-circuit response within their

interrupting rating. Some are current-limiting, such as Class T and J.

Others are non-current-limiting, such as Class H.

Dual Element (Time-delay) Fuses

Littelfuse time-delay IDSR, FLNR_ID/FLSR_ID Class RK5, and LLNRK/

LLSRK_ID Class RK1 series fuses have true dual-element construction.

Time-delay elements are used for overload protection, and separate fast

acting fuse links are used to provide current-limiting short-circuit protection.

Very Fast-Acting Fuses

Very fast-acting fuses are designed for very fast response to overloads

and short-circuits. They are very current-limiting.

Understanding Time-current Curves

Time-current curves for Littelfuse POWR-GARD™ fuses are shown in

each product section. They show the average melting times for that

fuse series at any current. In order to make the curves more readable,

they are presented on log-log paper. The overcurrent values appear

at the bottom, and increase from left to right. Average melting times

appear on the left-hand side of the curve and increase from bottom to

top. The amperage ratings of the individual fuses for a given series are

listed at the top and increase from left to right. Figure 11 shows the

average melting time curves for a typical time-delay fuse series.

Figure 12 compares the average melting times for 100 and 600 amp

ratings of three fuse types: Littelfuse POWR-GARD dual-element, time-

delay LLSRK series RK1 fuses; Littelfuse normal opening NLS series

fuses and Littelfuse very fast acting L60S series semiconductor fuses.

Table 1 com pares the opening times for these fuses.

Peak Let-through Charts

Fuses that are current-limiting open severe short-circuits within the

first half-cycle (180 electrical degrees) after the fault occurs. They also

reduce the peak current of the available fault current to a value less than

would occur without the fuse. This is shown in Figure 13.

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

15A

30A

60A

100A

200A

400A

600A

TIME IN SECONDS

CURRENT IN AMPERES

1000

800

600

400

300

200

100

.08

.06

.04

.03

.02

.01

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

100

100 AMP

600 AMP

GREEN = TIME-DELAY FUSE

RED = NORMAL OPENING FUSE

BLUE = VERY-FAST ACTING FUSE

TIME IN SECONDS

CURRENT IN AMPERES

Figure 11

Figure 12

Fuse Application Guide

Overcurrent Protection Fundamentals

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188 www.littelfuse.com

Fuseology

A fuse current-limiting effects are shown graphically on Peak Let-

through charts such as the one in Figure 14. The values across the

chart’s bottom represent the available (also referred to as potential or

prospective) rms sym met ri cal fault current. The values on the chart’s

left side represent the instantaneous available peak current

and the peak let-through current for various fuse ratings.

As an example, enter the chart on the bottom at 100,000 rms sym met-

ri cal amperes and read upwards to line A-B. From this point, read hor i-

zon tal ly to the left and read an instantaneous peak current of 230,000

amperes. In a circuit with a 15% short-circuit power factor, the in stan-

ta neous peak of the available current approximates 2.3 times the rms

symmetrical value. Line A-B on the chart has a 2.3:1 slope.

The curves that branch off line A-B show the current-limiting effects

of different fuse ampere ratings. Enter the chart in Figure 14 on the

bottom at 100,000 rms sym met ri cal amperes and read upwards to

the in ter sec tion of the 200 ampere fuse curve. Read horizontally to the

left from this point and read approximately 20,000 amperes. The 200

ampere fuse has reduced the peak current during the fault from 230,000

amperes to 20,000 amperes. 20,000 am peres is less than one-tenth of

the available current. 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.

Using the Peak Let-through Charts (“Up-Over-and-Down”)

Peak Let-through Charts for Littelfuse POWR-GARD™ fuses are shown in

each product section of this catalog. These charts are useful in determining

whether a given fuse can protect a specific piece of equipment.

For example, with an available fault-current of 100,000 rms symmetrical

amperes, determine whether 600 amp 250 volt time-delay Class RK1

fuses can protect equip ment with a 22,000 amp short-circuit rating.

Refer to Figure 15.

Locate 100,000A available fault-current on the bottom of the chart

(Point A) and follow this value upwards to the in ter sec tion with the

600A fuse curve (Point B). Follow this point horizontally to the left to

intersect with Line A-B (Point C). Read down to the bottom of the chart

(Point D) and read approximately 18,000 amps.

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,

equip ment with short-circuit ratings of 22,000 amps may be safely con-

nect ed to a system having 100,000 available rms sym met ri cal am peres.

This method, sometimes referred to as the “Up-Over- and-Down”

method, may be used to:

1. Provide back-up short-circuit protection to large air power circuit

breakers.

2. Enable non-interrupting equipment such as bus duct to be installed in

systems with available short-circuit currents greater than their short-

circuit (withstand) ratings.

Table 1

Comparative Opening Times for Time-Delay,

Fast-Acting, and Very Fast-Acting Fuses

Ampere Rating Fuse Type Opening Time in Seconds

500% Rating 800% Rating 1200% Rating

100

Time-Delay 12 secs. 0.9 secs. 0.14 secs.

Normal Opening 2 secs. 0.7 secs. 0.3 secs.

Very Fast-Acting 1.3 secs. 0.02 secs. >0.01 secs.

600

Time-Delay 14 secs. 0.7 secs. 0.045 secs.

Normal Opening 10 secs. 3 secs. 1.1 secs.

Very Fast-Acting 2 secs. 0.05 secs. >0.01 secs.

100

1000000

200000

300000

400000

600000

800000

100000

20000

30000

40000

60000

80000

10000

2000

3000

4000

6000

8000

1000

200

300

400

600

800

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

FUSE

AMPERE

RATING

600

400

200

100

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

PEAK LET-THRU IN AMPERES

Peak Let-through Current

Peak Current which would occur

without current limitation

Current

Time

Figure 13

Current limiting effect of fuses

Figure 14

Peak Let-through Charts

Fuse Application Guide

Overcurrent Protection Fundamentals

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189

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Fuseology

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 states:

“Where a circuit breaker is used on a circuit having an available fault

current higher than its marked interrupting rating by being connected on

the load side of an acceptable overcurrent protective device having the

higher rating, 240.86(A) and (B) shall apply.

(A) Marking. The additional series combination interrupting rating shall be

marked on the end use equipment, such as switchboards and panelboards.”

NEC Article 110.22 states:

“Where circuit breakers or fuses are applied in compliance with the series

combination ratings marked on the equip ment by the manufacturer, the

equipment enclosure(s) shall be legibly marked in the field to indicate

the equip ment has been applied with a series combination rating. The

marking shall be readily visible and state the following:

CAUTION - SERIES COMBINATION SYSTEM RATED ________

____ AMPERES. IDENTIFIED REPLACEMENT COMPONENTS

REQUIRED.

UL Listed fuse-to-circuit breaker series ratings are now available from

most national loadcenter and panelboard manufacturers. The Listings

are shown in their product digests and catalogs. Many local builders

have also obtained fuse-to-circuit breaker series ratings. For ad di tion al

information on this subject contact the Littelfuse Technical Support and

Engineering Services Group at 1-800-TEC-FUSE (1-800-832-3873).

Ampere (Current) Rating

A fuse ampere rating is the AC or DC current that the fuse can

continuously carry under specified conditions. Fuses selected for a

circuit must have ampere ratings that meet NEC requirements. These

NEC requirements establish maximum ratings and, in some cases,

minimum ratings. NEC Articles 240 and 430 contain specific re quire-

ments.

Fuse Dimensions

There is a trend toward miniaturization in almost ev ery thing, and

electrical equipment is no exception. While saving space may be an

important factor when selecting the proper fuses, other considerations

should not be overlooked. Some of these are:

a) Does the smallest fuse have the most desirable characteristics for

the application?

b) Does the equipment in which the fuse will be installed provide

adequate space for maintenance?

c) Do smaller fuses coordinate well with the sys tem’s other overcurrent

protection?

General Fusing Recommendations

Fuse 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

RK1 fuses, POWR-PRO FLSR_ID series Indicating Class RK5 current-

limiting fuses provide superior time-delay and cycling characteristics

along with all the benefits of an indicating fuse at lower cost than

RK1 fuses. FLSR_ID series fuses tell you when they have protected

your circuit and need to be replaced. If available fault currents exceed

100,000 amperes, equipment may need the additional current-limitation

capabilities of the POWR-PRO LLNRK/LLSRK/LLSRK_ID series Class

RK1 fuses.

Fast-acting JLLN/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 ap pli ca-

tions.

Time-delay JTD_ID/JTD series Class J fuses are used in OEM motor

control center applications as well as other MRO motor and transformer

applications requiring space-saving IEC Type 2 protection.

Class CC and Class CD series fuses are used in control circuits and

control panels where space is at a premium. Choose Littelfuse POWR-

PRO CCMR series fuses for protection of small motors. They are now

available with ampere ratings up to 60 amperes. Choose Littelfuse

KLDR series fuses for the protection of control power transformers and

similar devices.

Should you have any questions concerning product applications, call our

Technical Support Group at 800 TEC FUSE.

Fuses with ampere ratings from 601 through 6,000 amperes

For superior protection of most general-purpose and motor circuits, we

recommend POWR-PRO KLPC series Class L fuses.

Fuse Application Guide

Overcurrent Protection Fundamentals

100

1000000

200000

300000

400000

600000

800000

100000

20000

30000

40000

60000

80000

10000

2000

3000

4000

6000

8000

1000

200

300

400

600

800

100

200

300

400

600

800

1000

2000

3000

4000

6000

8000

10000

20000

30000

40000

60000

80000

100000

200000

FUSE

AMPERE

RATING

600

400

200

100

D A

AVAILABLE FAULT CURRENT

SYMMETRICAL R.M.S. AMPERES

PEAK LET-THRU IN AMPERES

Figure 15

Peak Let-through Chart for POWR-PRO®

LLNRK Class RK1 Dual-Element Fuses.

Using the Up-Over-and-Down Method.

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190 www.littelfuse.com

Fuseology

Coordinated (Selective) Systems

A “coordinated” or “selective” system is a system whose overcurrent

protective devices have been carefully chosen and their time-current

characteristics coordinated. Only the overcurrent device immediately on

the line side of an overcurrent will open for any overload or short-circuit

condition.

See definition of Selective Coordination in Definitions, and refer to

Figure 5 for a graphical example.

When a system is not coordinated, a fault at X might cause Fuse

B to open. This increases the amount of equipment out of service,

and makes it more difficult to locate the problem, thereby increasing

downtime.

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. Customer service is

interrupted; order pro cess ing ceases; yet expenses continue.

Even many UPS systems become unintentionally non-se lec tive, causing

power loss to computers and other critical equipment. Non-selectivity

may defeat otherwise well-en gi neered UPS systems.

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. Minimum equip ment is removed from service,

the faulted or overloaded cir cuit is easy to locate, and minimum time is

required to re store full service.

For these and many other reasons, selectivity is the stan dard by which

many systems are judged.

Fuse Selectivity

Refer to Figure 11 which shows typical average melting time curves

for one class of fuses. Note that the curves are roughly parallel, 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 divided into

melting I2t and arcing I2t (see definition of Ampere-Squared-Seconds).

The sum of these is the total clearing I2t.

For a system to be coordinated, the smaller fuse total clear ing I2t

must be less than the larger fuse melting I2t. Put another way, if the

downstream (branch) fuse opens the cir cuit before the overcurrent

affects the upstream (feeder) fuse element, the system will be

selective. This can be determined from curves showing melting and

total clearing I2t, or from minimum melting and maximum clearing time-

current curves.

The simplest method of coordinating low voltage power fus es is by use

of a Coordination Table such as the one shown in Table 2. This table is

only applicable for the Littelfuse POWR-PRO® and POWR-GARD™ fuse

series listed. Tables such as this one great ly reduce design time. For

example, the coordination table shows that POWR-PRO KLPC Class L

fuses co or di nate at a two-to-one ratio with other Class L fuses, and

with POWR-PRO LLNRK/LLSRK/LLSRK_ID series Class RK1 and

POWR-PRO JTD/JTD_ID series Class J fuses.

In the system shown in Figure 16, the 3000 amp Class L main fuses

are at least twice the ratings of the 1500, 1200, and 1000 amp Class L

feeder fuses, therefore they will co or di nate. The Coordination Table also

shows that the LLSRK series time-delay RK1 feeder and branch circuit

fus es coordinate at a two-to-one ratio with the Class L feeder fuses, so

the entire system in Figure 16 would be 100% coordinated.

Circuit Breaker Coordination

Because of the many types of circuit breakers and circuit breaker trip

units, developing a coordinated circuit breaker system or coordinating

circuit breakers with fuses is beyond the scope of this Guide. If you have

questions concerning these subjects contact the Littelfuse Technical

Support Group. For more information on fuses and circuit breakers

request Littelfuse Tech Topics Volume 2 – Fuses Vs. Breakers (PF327).

Component Short-Circuit Protecting Ability

NEC requires equipment protection to be coordinated with overcurrent

protective devices and available fault current to prevent extensive

damage to equipment. See Figure 17. Essentially, this means

that electrical equipment must be capable of withstanding heavy

overcurrents without damage or that they are protected by overcurrent

pro tec tive devices that will limit damage.

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;

before the current reaches its first peak. See Figure 13. Such fuses are

termed “current-limiting fuses.” Current-limiting fuses stop damaging

current faster than any other protective device. Current-limiting fuses

greatly reduce or totally prevent component damage from high fault

currents. This helps meet the NEC® Article 110.10 requirements shown

in Figure 17.

Fuse Application Guide

Overcurrent Protection Fundamentals

Figure 16

A Co or di nat ed (selective) Fused System

KLPC

3000

KLPC

1500

KLPC

1200

KLPC

1000

LLSRK

200

LLSRK

200

LLSRK

400

LLSRK

400

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Fuseology

Fuse Application Guide

Overcurrent Protection Fundamentals

Table 2

Fuse Coordination Table

Selecting the Correct Fuse Ampere Ratio to Maintain Selectively Coordinated Sys tems

Ratios are expressed as Line-Side Fuse to Load-Side Fuse

Line-Side Fuses Load-Side Fuses

Ampere

Range UL Class Littelfuse

Catalog No.

Time-Delay Fuses

Ampere Range, UL Class and Catalog No.

Fast-Acting Fuses

Ampere Range, UL Class and Catalog No.

601-6000 601-4000 30-600 30-600 30-600 30-600 30-1200 30-600 1-60

L L RK1 J RK5 RK1 T J G

KLPC

LDC KLLU LLNRK

LLSRK_ID

JTD_ID

JTD

FLNR_ID

FLSR_ID

IDSR

KLNR

KLSR

JLLN

JLLS JLS SLC

601-6000 L KLPC 2:1 2:1 2:1 2:1 4:1 2:1 2:1 2:1 N/A

601-4000 L KLLU 2:1 2:1 2:1 2:1 4:1 2:1 2:1 2:1 N/A

601-2000 L LDC 2:1 2:1 2:1 2:1 4:1 2:1 2:1 2:1 N/A

30-600 RK1 LLNRK N/A N/A 2:1 2:1 8:1 3:1 3:1 3:1 4:1

30-600 RK1 LLSRK_ID N/A N/A 2:1 2:1 8:1 3:1 3:1 3:1 4:1

30-600 J JTD_ID N/A N/A 2:1 2:1 8:1 3:1 3:1 3:1 4:1

30-600 RK5 IDSR N/A N/A 1.5:1 1.5:1 2:1 1.5:1 1.5:1 1.5:1 1.5:1

30-600 RK5 FLNR_ID N/A N/A 1.5:1 1.5:1 2:1 1.5:1 1.5:1 1.5:1 1.5:1

30-600 RK5 FLSR_ID N/A N/A 1.5:1 1.5:1 2:1 1.5:1 1.5:1 1.5:1 1.5:1

30-600 RK1 KLNR N/A N/A 3:1 3:1 8:1 3:1 3:1 3:1 4:1

30-600 RK1 KLSR N/A N/A 3:1 3:1 8:1 3:1 3:1 3:1 4:1

30-1200 T JLLN N/A N/A 3:1 3:1 8:1 3:1 3:1 3:1 4:1

30-1200 T JLLS N/A N/A 3:1 3:1 8:1 3:1 3:1 3:1 4:1

30-600 J JLS N/A N/A 3:1 3:1 8:1 3:1 3:1 3:1 4:1

1-60 G SLC N/A N/A 3:1 3:1 4:1 2:1 2:1 2:1 2:1

Figure 17

National Electrical Code Requires Effective Overcurrent Protection

NATIONAL ELECTRICAL CODE®

ARTICLE 110 – REQUIREMENTS FOR ELECTRICAL IN STAL LA TIONS

A. 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 sufficient for the nominal

circuit voltage and 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 and Other Characteristics. The overcurrent protective devices, the total impedance, the component 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 components 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 grounding conductor or enclosing metal

raceway. Listed products 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 600 volts, nominal. Part VIII covers overcurrent protection for those portions of supervised industrial installations operating at

voltages of not more than 600 volts, nominal. Part IX covers overcurrent protection over 600 volts, nominal.

(FPN): 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 con ductor insulation. See also Sections 110.9 for requirements for interrupting ratings and

110.10 for require ments for protection against fault currents.

(Reproduced by permission of NFPA)

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Fuseology

Fuse Application Guide

UL/CSA Fuse Charts

Non-Current Lim it ing

Fuses for overcurrent and short-circuit protection of

power and lighting feeders and/or branch circuits Current Lim it ing

Fuses for Supplementary Overcurrent Protection

Standards: UL Standard 248-14 (formerly 198F); 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 Sup ple men tal Fuses)

Voltage ratings: UL, 125 to 600 volts; CSA, 0-600 volts

Current ratings: UL, 0-30 amps; CSA 0-60 amps

Interrupting ratings: 10,000, 50,0000, or 100,000 amps rms sym met ri cal

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

LF Series: BLF, BLN, BLS, FLA, FLM, FLQ, KLK, KLKD (600 Volts DC)

NOTE: Littelfuse electronic fuses are also covered by these stan dards; see electronic

section of this catalog, or request Electronic Designer's Guide

(Publication No. EC101) for complete listing.

Special Purpose Fuses

There are no UL Standards covering this category of fuses. These fuses have special

char ac ter is tics designed to protect special types of electrical or electronic equipment

such as diodes, SCR, tran sis tors, thyristers, capacitors, integrally fused circuit break-

ers, parallel cable runs, etc. Fuses may be UL Recognized for use as a component in UL

Listed equipment. UL Recognized fuses are tested for char ac ter is tics such as published

interrupting capacity. They are also covered by UL re-ex am i na tion service.

Non-renewable

Voltage ratings: to 1000 volts AC and/or DC

Ampere ratings: to 6000 amperes

Interrupting ratings: to 200,000 amperes

Dimensions vary widely depending on ap pli ca tion, voltage and current ratings.

Many of these fuses are extremely current limiting. When considering application of

these fuses, or if you have special re quire ments, 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

Plug Fuses

Standards: UL Standard 248-11 (formerly 198F),

CSA Standard C22.2, No. 59.1

Voltage ratings: 125 volts AC only

Current ratings: 0-30 amps

Interrupting ratings: 10,000 amps rms symmetrical. In ter rupt ing 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 interchangeable.

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.

Time delay plug fuses are marked T, TD, o r Time Delay

NOTE: Plug fuses may be used where there is not more than 125 volts between conduc-

tors or more than 150 volts from any conductor to ground. This permits their use in

120/240 volts grounded, single-phase circuits.

LF Series: Edison-base: TOO, TLO

Type S: SOO, SLO

Type S Adapters: SAO

CLASS H

Standards: UL Standard 248-6 (formerly 198B),

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

Current 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 fuseholders which will also accept K1, K5, RK5, and RK1 fuses.

Manufacturers are upgrading Class H One-time fuses to Class K5 per UL Standard 198D,

See Class K fuses.

ONE-TIME FUSES

(NON-RE NEW ABLE)

Time delay: Optional

Time-delay fuses must hold 500%

current rating for a minimum of ten

seconds

LF Series: NLKP

RENEWABLE FUSES

Only Class H fuses may be renewable.

While time delay is optional, no

renewable fuses meet re quire -ments

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: RLN, RLS

Replaceable links Series: LKN, LKS

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Fuseology

Fuse Application Guide

UL/CSA Fuse Charts

CLASS T

Standards: UL Standard 248-15 (formerly 198H),

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 Rec og nized for 600V version

Interrupting rating: 200,000 amps rms symmetrical

Non-renewable

Fast-Acting fuses. High degree of current limitation

Very small fuses; space-saving and non-interchangeable with any other fuse class.

LF Series: JLLN/JLLS

CLASS CC/CD

Standards: UL Standard 248-4 (formerly 198C),

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

Non-renewable

Fuseholders: Fit UL Class CC and CD fuseholders which reject non Class CC fuses.

Time delay optional: Minimum of 12 seconds at 200% current rating.

LF Series: KLKR (Fast-Acting)

KLDR (Time-Delay for Transformers)

CCMR (Time-Delay for Motors)

CLASS K

Standards: UL Standard 248-9 (formerly

198D), No CSA Standard

Voltage ratings: 250 and 600 volts, AC

Current ratings: 0-600 amps

Interrupting ratings: Three permitted:

50,000, 100,000, and 200,000 amps rms sym

Non-renewable

Time delay is optional for Class K fuses.

Fuses marked “Time Delay”, “D” or “TD” are

required to hold 500% current rating for a

minimum of ten seconds.

Same Dimensions and Physically

Interchangeable with UL Class H fuses

Fits UL Class H fuseholders

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 K1

Same prescribed degree of

current limitation as RK1 fuses

when tested at 50,000 or

100,000 amps rms symmetrical.

LF Series:

Time Delay – Use LLNRK/LLSRK

Fast-Acting – Use KLNR/KLSR

CLASS K5

Same prescribed degree of

current limitation as RK5 fuses

when tested at 50,000 or

100,000 amps rms sym met ri cal.

LF Series: NLN/NLS

CLASS RK5

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: FLNR_ID, FLSR_ID and IDSR

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

LF Series: Time Delay: LLNRK, LLSRK, LLSRK_ID

Fast-Acting: KLNR, KLSR

CURRENT LIMITING FUSE LABELING

Fuses which meet the requirements for current limiting fuses are required to be labeled

“Cur rent 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. The words “Time Delay” or equivalent may also be included on the label when

the fuse complies with time delay requirements of its class.

CLASS G

Standards: UL Standard 248-5 (formerly 198C),

CSA Standard C22.2, No. 106, classified as HRC1 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.

LF Series: SLC

CLASS J

Standards: UL Standard 248-8 (formerly 198C),

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.

LF Series: Time-Delay: JTD_ID, JTD

Fast-Acting: JLS

CLASS L

Standards: UL Standard 248-10 (formerly 198C),

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

LF Series: KLPC, KLLU, LDC

CLASS R

Standards: UL Standard 248-12 (formerly 198E),

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 & RK5

Non-renewable

Time delay is optional for Class R fuses.

Fuses marked “Time Delay”, “D”, “TD”, or similar indications of time delay 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 fuseholders 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 fuseholders.

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Fuseology

Fuse Application Guide

Applying Fuses for Specific Applications

Fuses for Specific Applications (600 volts and Below)

IN DEX Page

Protecting Service Entrance and Feeder Conductors ..... 194

Motor Protection ........................................................................ 194-198

Motor Overload Protection (running overcurrent) ............... 195-196

Motor Feeder (100% motor Load) over 600A. ................... 197

Motor Branch Circuit Protection over 600A. ....................... 197

Motor Controller (Starter) Protection over 600A. ............... 197

Control Circuit Protection ...................................................... 197

Control Transformer Protection ............................................ 197-198

Protecting Branch Circuits ....................................................... 198

Transformer Protection ............................................................. 198

Primary Fusing only ............................................................... 198

Primary Fusing With Secondary Fusing .............................. 198

Secondary Fusing of Transformers ...................................... 198

Fusing Capacitors ....................................................................... 198

Lighting Fixture Protection ...................................................... 198

Street Lighting and Other Weatherproof

........ Overcurrent Protection ................................................. 198

Cable Short-Circuit Protection (Cable Limiter Application) .199

Semiconductor and Solid-state Device Protection .......... 199

Medium Voltage Protection ..................................................200-203

Protecting Service Entrance and Feeder Conductors

601 through 6000 amperes

Select POWR-PRO® KLPC series Class L fuses for AC circuits from 601

through 6000 amperes. The construction and operating characteristics

of KLPC series fuses meet the toughest project specifications for Class

L fuses:

• They provide maximum time-delay and current-limitation.

• They have a 300,000 amp interrupting rating.

• They have an “O-ring” seal to improve short-circuit performance.

• The fuse links are 99% pure silver.

If the system has DC circuits, another choice is the POWR-PRO LDC

series Class L fuses for AC and DC circuits available from 601 through

2000 amperes. LDC series fuses are the only Class L fuses which are

UL Listed at both 600 Volts AC and DC. When facilities have a mix of

large AC and DC circuits, standardizing on LDC series for all Class L

fuses should be considered. This reduces inventory and elim i nates the

possibility that an AC-only fuse will be used in a DC circuit.

When conductors are selected in accordance with the NEC®,

recommended fuse ratings for mains and feeders with combined motor

and non-motor loads are:

• 150% of the largest motor full load current plus,

• 100% of all other motors full load currents plus,

• 125% of the continuous1 non-motor load plus,

• 100% of non-continuous, non-motor load.

If the largest motor has a long acceleration time requiring branch circuit

protection to be increased to 175-225% of FLA, it may be necessary

to increase main and feeder fuse ratings to 175-225% of the largest

motor FLA plus the other current values as indicated above. However,

if conductor ampacity has been increased to provide spare capacity

for future loads, fuse ratings may be increased to the ampacity of the

conductors.

When standard fuse ratings do not match conductor ampacities, the

next larger standard fuse ratings may be used only if they are rated

less than 800 amperes. If fuse ratings are over 800 amperes, the next

smaller ratings must be used. In addition to all standard ampere ratings,

KLPC and LDC series fuses have many additional ampere ratings. The

additional ratings permit minimum downsizing of fuses, saving valuable

conductor ampacity.

Main Services and Feeders 600 amps and less

Several fuse series may be used for main services and feeders under

600 amperes. Choices should be made on the needs of the particular

facility. Some of the needs to be considered are discussed below, with

recommendations for fuses that meet those needs.

The vast majority of electrical systems, especially those 600 amps and

smaller, have available short-circuit currents less than 100,000 amperes.

Class RK5 fuses have provided excellent protection for such circuits

for many years. When fault currents exceed 100,000 amperes at the

service entrance, a study should be made to determine if the additional

current limitation provided by Class RK1 or Class J fuses is required.

POWR-PRO Class RK5, 600 Volt FLSR_ID series Indicator® fuses

provide superior time-delay plus substantially better current limitation

than required by UL Class RK5 standards. In addition, the patented

indicating window on the fuse immediately shows which fuses are

blown. This can significantly reduce downtime.

POWR-PRO Class RK1, 250/600 Volt LLNRK/LLSRK/LLSRK_ID series

time-delay fuses are the fuse of choice for circuits where fault currents

exceed 100,000 amperes. The LLSRK advanced design reduces short-

circuit damage to full-size NEMA and sensitive IEC motor controllers, and

is capable of providing Type 2 “No Damage” protection to NEMA size

motor starters. Together with the KLPC series fuses, the LLNRK/ LLSRK

series form the foundation of the POWR-PRO Fuse system of overcurrent

protection. And, the patented indicating window on the LLSRK_ID series

provides the same benefits of blown fuse indication for the user.

POWR-PRO Class J 600 Volt JTD_ID series time-delay fuses provide

the amount of time-delay necessary for most applications and are

substantially smaller than RK5 or RK1 fuses with current-limitation equal

to the RK1 fuse. JTD_ID series fuses provide IEC Type 2 “No Damage”

protection to both NEMA and IEC control components and motor

controllers. When time-delay is required and space is the determining

factor, JTD_ID time-delay Class J fuses provide the answer.

1 See Definitions for “Continuous Load.”

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Fuseology

Fuse Application Guide

Applying Fuses for Specific Applications

When conductors are selected in accordance with the NEC®,

recommended fuse ratings for mains and feeders rated 1 to 600A with

combined motor and non-motor loads are:

• 150% of the largest motor full load current plus,

• 100% of all other motors full load currents plus,

• 125% of the continuous1 non-motor load plus,

• 100% of non-continuous, non-motor load.

Motor Protection

The importance of effective motor and motor circuit protection cannot

be over emphasized. Motors are consistently the largest single cause of

in dus tri al and commercial fires.

In today’s highly automated commercial and industrial facilities, the

failure of even one relatively minor motor may shut down an entire

installation.

Motor Characteristics

Motors discussed herein are standard characteristic AC induction

motors, which cover about 80-85% of all motors. Special purpose

motors are beyond the scope of this publication. Specific application

information and protection requirements for these special purpose

motors should be obtained from the motor manufacturers.

Horsepower Ratings

A motor’s assigned horsepower rating indicates the work that it can

do under standard test conditions. It is the maximum horsepower load

the motor can drive over a long period without exceeding its rated

temperature rise. However, a motor can develop far more horsepower

than its rating, and if the overload does not last long enough to overheat

the motor, no damage occurs.

A motor tries to rotate any load attached to it. If the load is too large,

the motor will not be able to rotate and will overheat and fail within a

very short period. However, if the motor is able to start and run with

an overload, excess heat will be generated. If the motor is not stopped

or the overload removed, the excess heat will gradually de te ri o rate the

insulation, and the motor will prematurely fail.

Motor RPM

The motor nameplate shows the rated speed of the motor in revolutions

per minute (RPM) with rated full load attached. The no-load speed of

the motor is somewhat higher. The no-load (synchronous) speed of a

motor is a function of its design and the number of poles (windings).

Table 3 shows the relationship between the number of poles, no-load

speed, and full load speed shown on the motor nameplate.

All non-synchronous induction motors begin to slow down as the load

increases. This is commonly referred to as “slip.” As load increases, the

motor current and slip increase.

Motor Running Current

Full Load Amperes (FLA or F.L.A.): A motor’s rated full load amps

(full load current) is the motor’s running current when connected to a

load equal to its horsepower rating. If load exceeds the horsepower

rating, current will exceed the FLA and the motor may overheat. The

vast majority of motors are only partially loaded. As load decreases,

motor current decreases.

Partially Loaded Motors: If a motor is not connected to any external

load, it still requires a certain amount of current to turn the rotor. This

is defined as the “no-load amps” or “no-load current.” No-load current

is a constant for any given motor and does not change with load.

However, no-load current varies widely for different motor designs and

horsepower ratings.

A motor’s actual running current is the sum of no-load current and load

current. For all practical purposes, load current increases directly as the

load increases. If a motor is loaded to only 50% of rated horsepower,

then the actual load current will be approximately 50% of the full

potential load current.

If a given motor’s no-load current is 30% of FLA, load current is 70%

FLA (100% - 30% = 70%). At 50% rated load, the load current would

be about 35% FLA (one-half of 70%). Added to no-load current of 30%,

motor running current at 50% load will be about 65% FLA (30 + 35 =

65%). If the same motor were 75% loaded, the motor running current

would be about 83% FLA (0.70 X 0.75 + 0.30 = 0.83).

Motor starting currents: When a motor is first energized, a great

deal of energy (torque) is required to overcome the inertia of the motor

and the load. Once the load is moving, it requires much less energy to

keep it moving.

At the instant a motor is energized, motor current peaks at about 12-

15 times the nameplate FLA. This is the current required to magnetize

the motor windings. Within 1/2 to 3/4 cycles (0.008-0.0125 seconds)

the full magnetic field is developed, and current decreases from 12 to

15 times FLA to roughly 4.5 to 8 times FLA. This is called the motor

starting current, and is also the current the motor will draw if it stops

while energized. This is why it is also referred to as the locked-rotor

amps (LRA).

The exact value of LRA is determined by motor design, and is shown

on the motor nameplate by the NEMA design letter. Motors designed

to start only low inertia loads have the lowest starting current. Motors

with the same horse pow er ratings but designed to start very high

inertia loads such as large flywheels, hammer mills, etc., will have much

higher starting currents. Table 4 shows the starting current for various

designs.

As the motor speed increases from zero, current remains high until

the motor reaches about 85-90% full speed. Current then begins to

decrease, and when the motor reaches full speed for the attached load,

current decreases to normal running current.

Table 3

Synchronous (No Load) Speed of Induction Motors vs Full Load Speed

Number of Poles Synchronous (No Load)

Speed (RPM)

Typical Full Load

Speed Range (RPM)

2 3600 3450 – 3500

4 1800 1710 – 1760

8900855 – 880

12 600 520 – 610

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Fuseology

Single-phasing of three-phase motors

Three phase motors are designed to operate with three balanced

phases. When one phase is missing, severe damage may occur if

the motor is not rapidly de-energized. This may be due to an open

wire in a motor junction box, an open motor winding, a blown fuse, a

burned contact in a motor controller, a defective circuit breaker, or other

conditions. What happens when single-phasing occurs depends on

the nature of the circuit. There are several possibilities which must be

examined to fully understand the problem:

When there is only one motor on a circuit which is single-

phased

If the motor is not running at the time, and then tries to start while

single-phased, it will not have sufficient avail able energy to overcome

starting inertia, and will stay in a locked rotor condition. The motor will

draw full locked rotor current, and most overcurrent protection devices

will open the circuit quick enough to prevent serious motor damage.

If the motor is running at the time it is single-phased, current in the

remaining legs theoretically increases to 1.73 times the current being

drawn when the single-phasing occurs. Single-phased motors, however,

do not have the capability of developing full horsepower and torque, so

the motors may begin to slow down (increased slip) depending on the

amount of load. The motor is designed to operate at full speed, so the

current increases as the slip increases.

A motor that is more than 80% fully loaded at the time of single-phasing

will slow down quite rapidly and stop. Current increases to locked rotor

values, and the running overcurrent protection will de-energize the

circuit in sufficient time to protect the motor from significant damage.

A motor that is loaded to less than 50-60% load will not slow down

significantly while the current increases to 173% of the current being

drawn just prior to single-phasing. Since this is less than FLA, ordinary

running overcurrent protection will not sense this as an abnormal

condition and the motor will continue to run. When it stops, it will

obviously not restart again until the source of the single-phasing is

eliminated. Fortunately, the extra heat gen er at ed under these single-

phase conditions can usually be dissipated by the motor. Little damage

is done, unless the single-phasing continues for an extended period of

time. For added protection to large, expensive motors, (es pe cial ly those

over 600 volts), consideration should be given to installation of single-

phase detection or voltage im bal ance relays.

It is the group of motors loaded from 55-60% through 80% that

present the greatest challenge. When these motors are single-phased,

they slow down but continue to rotate. Current in the energized legs

increases to approximately 200-220% of current being drawn at the

time the motor was single-phased. This is a combination of the increase

due to single-phasing (173%) plus that due to slow down (slip increase).

Since this may vary from slightly less than FLA, up to as much as 200%

FLA, standard overcurrent protection may not provide adequate protection

when sized in accordance with rated full load amps of the motor.

The voltage imbalance in the circuit may also result in extra heat. This

additional heat produces damage in excess of that produced by current

alone.

The best way of reducing this type of damage is to measure the actual

current drawn by the motor under normal conditions, determine if

there may be temporary overloads that need to be considered, and

size overcurrent protection just large enough to permit the motor to run

under normal conditions.

Fuse Application Guide

Applying Fuses for Specific Applications

Table 4

Starting Current (Amperes) for Various Types of Motor Designs

NEMA

Code

Letter

Locked

Rotor

KVA Per

Hrspwr.

Maximum Locked Rotor Amps

for NEMA Code Letter Motors

Single Phase Three Phase

115V 230V 200V 230V 460V 575V

A 3.14 27.3 13.7 9.1 7.9 4.0 3.1

B 3.54 30.8 15.4 10.2 8.9 4.5 3.5

C 3.99 34.7 17.4 11.5 10.0 5.0 4.0

D 4.49 39.1 19.5 13.0 11.3 5.7 4.5

E4.9943.421.714.412.56.35.0

F 5.59 48.6 24.3 16.2 14.0 7.0 5.6

G6.2954.727.418.215.87.96.3

H 7.09 61.7 30.8 20.5 17.8 8.9 7.1

J 7.99 69.5 34.8 23.1 20.1 10.1 8.0

K 8.99 78.2 39.1 26.0 22.6 11.3 9.0

L 9.99 86.9 43.5 28.9 25.1 12.6 10.0

M 11.19 97.4 48.7 32.3 28.1 14.1 11.2

N 12.49 108.7 54.3 36.1 31.3 15.7 12.5

P 13.99 121.7 60.9 40.4 35.1 17.6 14.0

R 15.99 139.1 69.6 46.2 40.1 20.1 16.0

S 17.99 156.5 78.3 52.0 45.2 22.7 18.0

T 19.99 173.9 87.0 57.8 50.2 25.2 20.0

U 22.39 194.8 97.4 64.7 56.2 28.2 22.4

V 24.00 208.8 104.4 69.4 60.2 30.2 24.0

Figure 18

3 motor 1 motor

3 motor 3 motor

Open circuit

10 HP 1 HP

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Fuse Application Guide

Applying Fuses for Specific Applications

Several motors single-phased on one circuit

When there is more than one motor on a circuit that is single-phased,

the effects on motor current depend on the relative size of the motors,

and whether they are all three-phase, or whether there is a mix of three-

phase and single-phase motors.

Figure 18 presents two such cases. In the circuit with a three-phase

and a single-phase motor, the three-phase motor was loaded to 70% of

full load. The feeder was then single-phased as shown. The currents in

the three-phase motor increased to 52%, 120%, and 36% of full load

current in the three phases. At 120% current, it is ques tion able whether

standard running overcurrent protection sized at 115% of rated FLA could

provide protection from damage due to overload and voltage imbalance.

When the circuit with the ten horsepower and one horse pow er three-

phase motors was single-phased, the smaller motor did little to affect

the currents in the larger motor, but the one horsepower motor was

in serious trouble. One of the currents was 140% of normal, while

the other two currents were only slightly above the standard rating of

running overcurrent protection.

When the ampere rating of a motor’s running overcurrent protection

is based on the motor’s actual running current, adequate protection

may be provided for such conditions. However, as is usually the case,

if the ampere rating of a motor’s running overcurrent protection is

based on nameplate FLA and the motor is only partially loaded, the

protective devices (overload relays and fuses) may not open in time

to protect the motor because the current will not increase enough to

operate the relays.

For these reasons, and many others, it is strongly rec om mend ed that

Littelfuse POWR-GARD™ dual-element fuses be properly sized per the

recommended guidelines.

Protection required by motors

Since mains and feeders usually serve a mix of inductive and resistive

loads, time-delay fuses provide significant advantages. Even when there

is no motor load, time-delay fuses reduce other nuisance outages caused

by temporary overloads or switching surges. Available short-circuit current

is generally highest at the main service disconnect so that adequate

interrupting capacity and maximum current limitation are also desirable.

Motor Branch Circuits

Most motor circuits contain motor controllers (starters) which start and

stop the motor, overload relays to provide motor running protection, and

in some cases other relays to provide other types of protection.

Time-delay fuses should be considered a must for motor branch circuits.

Motor starting currents and the possibility of temporary overloads

and/or voltage surges would require oversizing of non-time delay fuses

— often as much as 300%. In such cases, only short-circuit protection

is provided, and because of the oversizing necessary, larger switches

and enclosures are required. This is true of MCCs as well. Properly

selected, time-delay fuses also provide back-up protection to the motor

controllers for such conditions as single-phasing and contact welding.

Recommended ratings of RK1 and RK5 time-delay fuses for motor branch

circuits containing motor controllers with overload relays are as follows:

For general purpose motors with 1.15 service factor or 40° C rise, the

fuses may generally be rated at 125% of motor’s FLA. When fuse

ratings do not match the motor’s FLA, use the next larger standard

fuse rating, but do not exceed the NEC® limitation of 175% of motor’s

FLA as given in NEC Tables 430.248 through 430.250. Following these

guidelines will provide optimum pro tec tion to the circuit.

High efficiency motors and NEMA Design E motors have much higher

efficiencies, and also require higher locked rotor currents in relation

to FLA. They will require careful selection of both fuses and overload

relays. In these circuits, we recommend sizing fuses at 150% of FLA, or

the next smaller rating.

These recommendations will cover about 90% of all motor applications.

For those motors with especially severe starting duty and long

acceleration times, Table 430.52 of the NEC permits time-delay fuses to

be sized up to 175% of motor FLA.

If 175% of FLA will not permit the motor to start, fuse rating may be

increased to a maximum of 225% of motor FLA.

Pages 204 – 206 contain Motor Protection Tables that simplify the

selection of Littelfuse RK5, RK1, J and CC fuses for motor running

protection and motor branch short-circuit and ground fault protection.

Motor Feeders Over 600A With 100% Motor Load

Recommended fuses are POWR-PRO® KLPC series.

Recommended fuse ratings when conductors are selected in

accordance with the NEC are 150% of largest motor’s full load current

plus the full load current of the other motors. If required rating does not

correspond with a KLPC ampere rating, use the next larger rating.

Fuses for Mains and Feeders With No Motor Loads

Minimum fuse rating is 125% of the continuous load plus 100% of the

non-continuous load.

Fusing Motor Control Centers (MCCs)

The same general considerations apply to protecting MCCs as they do

to mains and feeders. Use time-delay current-limiting fuses as described

above to provide protection to the entire MCC including buses and

internal construction.

Feeders serving MCC are sized the same as general-purpose mains

and feeders since many MCC have both motor and non-motor loads.

Non-motor loads may include fused switches that serve dry-type

power transformers used for lighting panels or feeders to distribution

panels. MCC ampere ratings based on the MCC main buses usually

exceed the load connected to the MCC. Therefore, fuses feeding

the MCC or located in a main switch in the MCC may be rated to

protect the MCC buses, as long as they meet the minimum size as

determined above.

Fusing Control Transformers

With one exception, control transformers are protected the same as

regular transformers as discussed below. Control transformers with

primary current less than 2 amperes and which are part of a Listed

motor controller may have primary fusing not greater than 500% of

rated primary current.

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Protecting Branch Circuits

Multi-outlet branch circuits must be protected in accordance with the

ampere rating of the overcurrent protective device. Ratings shall be 15,

20, 30, 40, and 50 amperes, although non-lighting loads in industrial

facilities with adequate main te nance may have branch circuits larger than

50 amperes.

Special purpose branch circuits must have adequate capacity for the

load to be served. Refer to NEC® Article 210.2 for a listing of Articles and

Sections covering requirements for specific equipment not covered in this

section.

Transformer Protection

Transformers over 600 volts

The basic rule for trans form ers rated over 600 volts requires them to

have primary and secondary pro tec tion in accordance with Table 5.

Transformers rated 600 volts and less

UL Industrial Control Standards (No. 508) and Motor Control Center

Standards (No. 845) specify control power transformer protection

corresponding to NEC 430.72(C). In addition, UL requires the primary

of control power trans form ers used in controllers having short-circuit

ratings in excess of 10,000 amperes to be protected by UL Class CC,

J, R, or T fuses. For maximum fuse ratings permitted by the NEC,

refer to Table 6 for sizing of primary fusing and Table 7 for sizing of

secondary fusing.

Fusing Capacitors

Capacitors installed on the load side of motor running overcurrent

protection are required to have individual protection. All other capacitors

are required to have an individual fuse in each ungrounded conductor.

NEC Article 460.8(B) requires that the fuse rating be as small as

possible. Use POWR-PRO® dual-element time-delay fuses rated at

150% to 175% of capacitor rated current.

Lighting Fixture Ballasts

Ballasts for all types of discharge lighting should be protected with

individual fuses. Even the newer electronic ballasts with internal fusing

benefit from fusing of the fixture. Individual fusing helps prevent loss of

an entire lighting circuit when one ballast or fixture fails. This prevents

loss of production. When only one fixture is removed from service, the

user can now identify the fixture in trouble and eliminate the need to

test all the fixtures to locate the problem. UL Listed Class P ballasts

are only tested at 200 amps fault current, and the test circuit has a fuse

ahead of the ballast. With available currents continuing to increase,

individual fixture fusing reduces the possibility of the ballast failing

in such a way that the fixture is damaged. Since ballast designs and

characteristics vary so much, recommendations for ballast fusing should

be obtained directly from the ballast manufacturer.

Fusing of Outdoor Lighting Standards

Whether the lighting fixtures are being used for highway lighting,

street lighting, or for parking lots, each fixture should be fused using a

Littelfuse Class CC or midget fuse installed in a LEB or LEC weather

proof fuseholder. These fuseholders were designed to fit in the base

of lighting standards. They withstand wet and corrosive con di tions,

including those caused by snow-melting chemicals. Fusing each fixture

eliminates having to test the entire circuit for the faulted fixture when

only one fails. In industrial plants where outdoor lighting provides safety

and security, this is particularly important.

Fuse Application Guide

Applying Fuses for Specific Applications

Table 5

Fuses for Transformers over 600 volts

Transformer

Rated

Impedance

Maximum Fuse Rating in Percent

of Transformer Rated Current

Primary

Fuse Rating

Over 600

Volts

Secondary Fuse Rating

Over

600 volts in

all locations

600 volts

or less in

unsupervised

locations

600 volts

or less in

supervised

locations

Not more than

6% 300% 250% 125% 250%

More than 6%

and not more

than 10%

300% 225% 125% 250%

Notes to Table 5

1. Littelfuse IDSR, LLNRK/LLSRK/LLSRK_ID, FLNR_ID/FLSR_ID, and JTD_ID series

time-delay fuses may be rated at 125% of transformer secondary current.

2. Where the required fuse rating does not cor re spond to a standard fuse rating, the

next higher standard rating is permitted.

3. An individual primary fuse is not required if the primary circuit fuse is not greater

than 300% of transformer primary current.

Table 6

Maximum Acceptable Rating of Primary Overcurrent Device

Rated Primary

Current Amperes

Maximum Rating of Overcurrent Protective Device

% of Transformer Primary Current Rating

No secondary

fusing provided

Secondary fusing provided in

accordance with Table 7

Less than 2 30012501

2 to less than 9 167 250

9 or more 1252250

Table 7

Maximum Acceptable Rating of Secondary Overcurrent Device

Rated Secondary

Current Amperes

Maximum Rating of Overcurrent Protective Device

% of Transformer Secondary Current Rating

less than 9 167

9 or more 1252

Notes to Tables 6 & 7

1. 500% for Motor Circuit Control Power Transformers.

2. If 125% does not correspond to a standard fuse rating, the next higher standard

rating may be used.

Reference NEC 430.72 (c) Exception No. 2: 450.3 (b) 1 and 2 UL 508 32.7: 845 11.16

and 11.17.

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Fuse Application Guide

Applying Fuses for Specific Applications

Cable Short-Circuit Protection

(application of cable limiters)

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. Cable limiters are 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

con duc tors per phase and may be installed on the line side of the main

service to provide short-circuit 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.

The principle involved is illustrated in Figures 19 and 20. The first

example has two cables per phase, as shown in Figure 19. When a

fault occurs in either cable as illustrated by the “X”, most of the fault

current will flow directly to the fault through limiter L-1. L-1 will open, and

all the fault current will back feed the fault via limiters L-3, L-4, and L-2.

Since all of the limiters have the same rating, they will all open resulting

in the entire circuit being shut down.

However, when a fault occurs and there are three or more cables per

phase, this problem can be avoided. This scenario is illustrated in Figure

20. When a fault occurs at point “X”, current will flow directly to the

fault opening limiter L-1. The fault current will back feed the fault, but

when there are three or more conductors in parallel, it divides between

the re main ing cables. When there are three conductors in parallel as

shown in Figure 20, one half of the fault current will flow through

limiters L-3 and L-4, and one-half will flow through limiters L-5 and L-6.

All of the fault current will flow through limiter L-2 causing it to open

before the other limiters. As a result, only the one cable is removed

from service.

By isolating faulted cables quickly, cable limiters prevent damage

to conductor insulation caused by the heating effects of large fault

currents. For example, if the cable run shown in Figure 20 passed

through pull boxes or manholes, and one section of the cable faulted,

only the faulted section would require replacement instead of one or

more entire lengths.

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

Service entrance conductors.

Between transformer or network bus and busway terminal boxes.

Large feeders with three or more conductors per phase.

Features/Benefits

• Fast-acting current-limiting characteristics provide pro tec tion 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.

Semiconductors and Solid-State Device Protection

Semiconductors generally are very sensitive to low value overloads and

to short-circuit currents. As a result, they require fuses referred to as

“very fast-acting” fuses. Littelfuse Semiconductor fuses are designed

specifically to protect power electronics equipment. For application

information refer to Littelfuse Semiconductor Application Guide PF336

or the Semiconductor fuse section of this catalog.

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. At higher ambient temperatures, the continuous current

carrying capacity will be decreased as shown in the chart below. This

closely follows the derating tables for all electrical equipment, and

can help reduce equipment burnout due to high ambient conditions.

Littelfuse SLO-BLO® or Time-Delay fuses derate quicker in higher

ambient conditions, so they in effect, act as “self-protecting” devices

and maintain their integrity until opening.

L-1

L-3

L-2

L-4

L-3

L-5

L-4

L-6

L-1 L-2

Figure 19

One Line Diagram of Circuit with Two Conductors Per Phase

Figure 20

One Line Diagram of Circuit with Three or More Conductors Per Phase

0 0

AMBIENT TEMPERATURE

PERCENT OF UPRATING

PERCENT OF DOWNRATING

KEY TO CHART:

Curve A - Slo-Blo® Fuse

Curve B - Medium and Fast-Acting Fuses

-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

140°C

264°F

Fuse Rerating Curve

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Fuse Application Guide

Applying Fuses for Specific Applications/Applying Medium Voltage Fuses

Medium voltage fuses are applied quite differently than fuses rated 600

volts and less. The biggest difference is: medium voltage fuses are not

intended to provide overload protection. They should only be applied

where they will not be required to open small overcurrents. Another

major difference is the wide range of system voltages which results in a

correspondingly large number of fuse voltage ratings.

Descriptions and ratings of Littelfuse medium voltage fuses are located

in the medium voltage fuse section of this catalog, which also contains

some application data. The following is a more detailed discussion of

factors which must be considered.

Littelfuse medium voltage fuses are silver-sand, non-expulsion, current-

limiting type. When properly applied, they are designed to carry their

nominal current rating continuously without “fatigue failure.” This means

that the fuse will not age, become brittle, or deteriorate under the most

severe duty cycling.

There are two basic types of current-limiting, medium voltage fuses:

general purpose and back-up. General purpose fuses have the ability

to interrupt both large and small short-circuits down to currents which

would cause the fuse to open within one hour. General purpose fuses

are used to provide short-circuit protection for trans form ers, switchgear,

and similar equipment.

Back-up fuses are designed to only protect against high fault currents

and must be used in series with equipment which provides the circuit’s

required overload and low value short-circuit protection.

Medium Voltage “E” rated fuses are general purpose fuses. Their

mounting dimensions permit them to be installed in a wide variety of

medium voltage switches, in pad-mounted transformers, and other

similar locations. “R” rated MV fuses are specifically designed to

provide short-circuit protection for medium voltage motor con trol lers

and associated equip ment.

Selecting Medium Voltage Fuses

Four factors must be considered when applying MV fuses: voltage

rating, interrupting rating, current rating, and coordination with other

overcurrent protective devices.

Voltage Rating

In common with fuses rated 600 volts and less, MV fuses minimum

voltage ratings must be equal to or greater than the maximum recovery

voltage which the fuse will ex pe ri ence under the worst possible conditions.

Normally, this requires the fuse voltage rating to be greater than the

system’s maximum line-to-line voltage. However, when fusing single-phase

loads which are connected from line-to-neutral on an effectively grounded

four wire wye system, a fuse maximum design voltage only needs to be

greater than the system’s maximum line-to-neutral voltage. When fuses

are selected on this basis, it must be impossible for the fuse to experience

line-to-line voltage. Therefore, if more than one phase is extended beyond

the fuse location, it is best to use fuses with a voltage rating greater than the

maximum line-to-line voltage.

While not required for low voltage fuses, MV fuses maximum voltage

rating must also be considered. For a fuse to be current-limiting, it must

interrupt the circuit withing 180 electrical degrees (one-half cycle) after

the fault occurs. It does this by producing an arc voltage across the fuse

which is greater than the system voltage. This forces current to zero

before the available short-circuit current reaches its first peak.

Arc voltages are created in the fuse by the melting of the fuse links. This

produces a number of high resistance arcs (gaps) in series, and there is

a voltage drop across each gap. When the total voltage drop exceeds

system voltage, current flow stops. As this occurs, a transient voltage

spike is gen er at ed in the system, (see Figure 21). Care must be taken

to see that this voltage is not greater than the system’s basic insulation

level (BIL). If the fuse maximum design voltage rating does not exceed

140% of the electrical system’s voltage, arc (transient) voltage will not

usually be a problem.

However, higher voltage fuses may be used if certain conditions are

met. When tested at nominal voltage rating and rated interrupting

current, Littelfuse MV fuses are designed so that the peak arc voltage

does not exceed three times the fuse nominal voltage. If the electrical

system being protected has a basic insulation level (BIL) greater than

three times the fuse maximum design voltage, the higher voltage fuses

may be used. See the following example:

Given: System nominal voltage = 4,800 volts

System BIL = 50 kV

Can a POWR-GARD™ 15NLE-80E fuse, rated 14,400 volts

nominal and 15,500 volts max. be used in this system?

Maximum peak voltage produced by this fuse =

3 X 14,400 = 43,200 volts.

43,200 volts is less than the BIL of 50 kV, so the 15NLE-80E fuse

may be used.

Medium Voltage Fuses Used With Lightning Arresters

When MV fuses are in the same circuit with lightning arresters, some

precautions must be taken to insure that the transient voltage spike,

which occurs when the fuse is interrupting a fault, does not cause

lightning arresters to spark over. When checking the BIL of the system,

INSTANTANEOUS ARC VOLTAGE

183% OF CYCLEPEAK

RESTORED VOLTAGE

PEAK

Figure 21

Medium Voltage (MV) Fuse Ap pli ca tion

(2,400 - 38,000 Volts AC)

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Medium Voltage Fuses Used With Lightning Arresters

(continued from previous page)

lightning arresters are the first things that should be investigated. The

lightning arrester spark-over voltage must be higher than the transient

voltages which can be produced by the MV fuses. If arc voltages

produced by the fuses cause light ning arresters to spark over, a

relatively high current will be shunted into the arresters. However, they

are not designed to interrupt such currents.

If the fuses have a voltage rating higher than the arrester and are installed

on the arrester’s load side, the arrester may spark over when the fuse

is interrupting a large fault. If the system has only distribution class

arresters, there will seldom be a problem because distribution class

arresters have sufficient impedance to prevent large amounts of current

from passing through them. However, intermediate, line, and station type

arresters have low impedance, and if they spark over, sufficient current

may flow in an arrester to damage it severely. Intermediate, line, and

station type arresters should not be applied on the line side or in parallel

with current-limiting MV fuses unless the arresters’ spark over voltages

are greater than the arc voltages the fuses can produce. If the lightning

arresters and the fuses have the same voltage rating, arc voltages will be

within desired limits, and the problem is eliminated.

Another approach is to locate the fuses on the line side of the arresters.

However, in many cases this impossible. Utilities prefer to locate fuses

on the load side of lightning arresters to prevent lightning from damaging

the fuses. In still other cases, fuses may be mounted on the primary

transformer bushings or within pad-mounted transformer enclosures so

that lightning arresters will be on the line side of the fuses.

Machine protection lightning arresters, such as those used to protect

large motors and motor control, have very low spark over values and

may be easily damaged if they are located on the fuses line side.

However, arresters should always be mounted directly on the machine

terminals placing them on the load side of the fuses.

Interrupting Ratings

Maximum rms symmetrical AC component and maximum asymmetrical

current interrupting ratings for Littelfuse MV power fuses are shown in

the medium voltage fuse section of this catalog. MV fuses are tested

with a short-circuit X/R ratio of 25:1 which produces an rms asymmetrical

mul ti pli er of 1.6 times the symmetrical component 1/2 cycle after the fault

occurs. It also produces an instantaneous asymmetrical peak current 2.66

times the rms symmetrical component. The interrupting ratings indicate

the maximum symmetrical and asymmetrical fault current permitted at the

point where the fuse is installed.

Short-circuit kVA Ratings

It is common to state the short-circuit ratings of MV breakers and other

equipment such as switchgear in terms of short-circuit kVA. It must be

remembered that MV power fuses are not constant kVA devices. For

example, if the voltage is half of the fuse rating, the interrupting capacity

does not double. MV fuse interrupting ratings are given in symmetrical

and asymmetrical amperes. These values must not be exceeded at any

voltage.

When the short-circuit kVA is known, the rms symmetrical AC

component may be de ter mined from the formula:

SC = RMS sym met ri cal short-cir cuit current

kVA = Three phase short-circuit kVA

E = System line-to-line voltage

Effect of Frequency and Altitude

Interrupting ratings of MV fuses shown in the Product section are

valid for 50 and 60 Hertz systems. For 25 Hertz systems, multiply the

interrupting ratings shown by a factor of 0.74.

The continuous current ratings and interrupting ratings of MV fuses shown

in the Product section are valid up to 3,000 feet. Since the density of air

and its dielectric strength decreases as altitude increases, continuous

current ratings and interrupting ratings are affected at altitudes exceeding

3,000 feet. Table 8 provides altitude correction factors.

Continuous Current Ratings

Available current ratings of “E-rated” and “R-rated” MV fuses are

shown in the MV fuse section of this catalog. The current ratings

for MV fuses carry a different meaning than ratings for 600 volt and

below fuses. MV fuses are not intended to provide protection against

overloads or other overcurrents less than two times their continuous

current rating. If MV fuses are exposed to currents only slightly over

their continuous current rating, a large amount of heat is generated

within the fuse. The heat may cause the fuse tube to char and weaken,

and the time-current char ac ter is tics may be changed. If circuits can

produce sustained currents that are 100% to 200% of MV fuses current

ratings, other overcurrent devices must be in series with the fuses to

provide overload protection.,

MV fuses are designed to carry their rated current without exceeding

the temperature rise permitted by NEMA and ANSI standards. The “E”

and “R” ratings help define the operating characteristics of the fuses:

NEMA Standards for “E-rated” MV power fuses require that fuses rated

100E or less open within 300 seconds (5 minutes) when subjected to

an rms current of 200-240% of the fuse’s continuous current rating.

Fuses with an “E” rating larger than 100E must open within 600

seconds (10 minutes) when subjected to an RMS current of 220-264%

of the fuse continuous current rating.

Fuse Application Guide

Applying Medium Voltage Fuses

Table 8

Altitude Correction Factors per ANSI C37.40-2.3

Altitude Above Sea Level Continuous

Current Multiplier

Interrupting Rating

Multiplier

Feet Meters

4000 1200 .99 .98

6000 1800 .98 .92

8000 2400 .97 .86

10000 3000 .96 .80

12000 3600 .95 .75

14000 4300 .93 .70

16000 4900 .92 .65

18000 5500 .91 .61

20000 6100 .90 .56

ISC = kVA x 1000

1.732 x E

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NEMA Standards for “R-rated” MV power fuses require that they open

within 15-35 seconds when subjected to an rms current 100 times the

“R” rating.

These values establish one point on the fuses time-current curves

and help define the characteristics of E-and R-rated fuses. Since all E

and R-rated fuses must meet these re quire ments, the time-current

characteristics of E-rated and R-rated fuses of different manufactures

will have a certain similarity, although they are not necessarily identical.

A long-standing rule of thumb for applying MV fuses states that the

minimum fuse rating should be at least 1.4 times the circuit’s full load

current. This generally insures that MV fuses will not be required to

open overloads. If the nature of the load is such that load currents will

never exceed the rating of the fuse, MV fuses may be rated as close as

1.1 times full load current.

Motor Protection

To properly select MV fuses for motor protection, several factors

should be considered. R Rated fuses are only intended for short-circuit

protection and should be applied in conjunction with motor overload

relays. An R Rated fuse does not have an ampere rating and the “R”

rating refers to the opening time of the fuse. R Rated fuses are designed

to safely interrupt any current between their minimum and maximum

interrupting rating. When applying R Rated fuses, it is recommended

to follow the fuse sizing guidelines established by the motor starter

manufacturer.

When engineering a system, time-current characteristic curves of the

fuse and overload relay should be compared to insure the overload relay

opens before the fuse during overload conditions. The following table is

provided as a guideline for sizing R Rated fuses.

Transformer Protection

A principle use of MV fuses is to provide primary short-circuit protection

for transformers. When selecting MV fuses to protect transformers,

the following factors must be considered in descending order of

importance:

1. As explained above, the fuses voltage and in ter rupt ing ratings must

equal or exceed system requirements at the point where fuses will

be applied.

2. The fuse continuous current rating must be large enough to

withstand transformer magnetizing (in-rush) current. (Minimum Fuse

Rating).

3. The fuse continuous current rating must be able to withstand

transformer overloading and emergency operation, and meet NEC

requirements. (Maximum Fuse Rating).

4. Fuses must protect the system on the line side of the fuse from the

effects of short circuits on the load side of the fuses. (Utility System

Coordination).

5. Fuses must coordinate with the transformer secondary protection

where and whenever possible. (Facility System Co or di na tion).

6. Fuses must protect transformer against sec ond ary bolted faults.

7. Where and whenever possible, fuses should protect the transformer

against higher impedance secondary faults.

Transformer magnetizing or inrush current depends on several factors

such as transformer design, residual flux in the core at the instant

the transformer is energized, the point on the voltage wave at which

the switch is closed, and the characteristics of the electrical system

powering the transformer. Power transformers in-rush current

approximates 12 times the transformer full load current, and distribution

transformers 25 to 40 times full load current. The current generally lasts

less than 1/10 second.

Fuse Application Guide

Applying Medium Voltage Fuses

1000

200

300

400

600

100

200

300

400

1000

TIME IN SECONDS

Fuse Maximum

Clearing Curve

Fuse Minimum

Melting Curve

Typical transformer

damage curve for

3- phase faults on

3- phase transformers

and single-phase faults

on 1-phase transformers

CURRENT IN AMPERES

Maximum

Transformer

Overload

Current

Figure 22

R-Rated Fuse Sizing Table

For Motors with an

Acceleration of 10 Seconds

For Motors with an

Acceleration of 3 Seconds

Max.Motor FLA R Rated Fuse Max.Motor FLA R Rated Fuse

28A 2R 32A 2R

40A 3R 45A 3R

55A 4R 65A 4R

80A 6R 95A 6R

125A 9R 140A 9R

165A 12R 190A 12R

250A 18R 280A 18R

330A 24R 360A 24R

500A 36R 550A 36R

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To determine the minimum size fuse which will hold the in-rush current,

obtain the in-rush current from the trans form er manufacturer and mark

the current on the fuses minimum melting time-current curves at

0.10 second as shown in Figure 22. The minimum fuse rating is the

fuse whose minimum melting curve is just to the right and above the

transformer inrush point.

When the in-rush current is not greater than 12 times transformer

full load current, MV fuses with current ratings that equal or exceed

a transformer’s self-cooled, full load current will usually meet this

requirement. However, transformers are generally operated at

close to full load current on a continuous basis, and are overloaded

under emergency conditions. A typical example is a double-ended

loadcenter operated with a normally open bus tie. See Figure 23.

Each transformer is rated to carry 150% of the load on its half of the

loadcenter. With loss of service to one transformer, the main switch

for that line is opened, and the bus tie switch is closed shifting all load

to the remaining transformer. The system is operated overloaded until

the other line is back in service. If the outage will continue for a long

period of time, manual load shedding can be used to control transformer

overloading.

Other similar operating schemes also result in transformer overloading.

As a result, MV fuses usually have continuous current ratings larger than

required to withstand transformer in-rush current.

NEC® Article 450 covers transformer installations and establishes

the maximum ratings of transformer overcurrent protective devices.

Regarding medium voltage fuses, Article 450.3 states in part:

Overcurrent Protection of transformers shall comply with NEC Article

450.3(A) – Transformers Over 600 Volts, Nominal, and shall be provided

in accordance with Table 9.

NOTE: In this section, the word transformer shall mean a transformer or polyphase bank of

two or more single-phase transformers operating as a single unit.

Table 9

(Based on NEC Table 450.3(A) – Maximum Rating or Setting of Overcurrent Protection

for Transformers Over 600 Volts (as a Percentage of Transformer-Rated Current))

Primary Protection Over

600 Volts

Secondary Protection (See Note 2)

Over 600 Volts 600 Volts or Less

Location Limitations Transformer Rated

Impedance

Circuit Breaker

(see Note 4) Fuse Rating Circuit Breaker

(see Note 4) Fuse Rating Circuit Breaker or

Fuse Rating

Any Location

Not more than 6% (see Note 1) 600% 300% 300% 250% 125%

More than 6% but not more than

10% (see Note 1) 400% 300% 250% 225% 125%

Supervised

Locations Only (see

Note 3)

Any (see Note 1) 300% 250% Not Required Not Required Not Required

Not more than 6% (see Note 5 for

Secondary Protection) 600% 300% 300% 250% 250%

More than 6% but not more than

10% (see Note 5 for Secondary

Protection)

400% 300% 250% 225% 250%

Note 1 – If the required fuse rating or breaker setting does not correspond to standard ratings/settings, the next higher rating/setting may be used.

Note 2 – If secondary overcurrent protection is required, no more than six breakers or sets of fuses may be grouped in any one location. When multiple overcurrent devices

are used, the sum of all device ratings shall not exceed the allowed value of any single device. If both breakers and fuses are used, the total of device ratings shall

not exceed that if using only fuses.

Note 3 – A “supervised location” is one where maintenance and supervision conditions ensure that only qualified persons are allowed to monitor and perform installation

service on the transformer.

Note 4 – Electronically actuated fuses set to open at a specific current shall be set and calibrated in accordance with the corresponding settings of the circuit breakers

involved.

Note 5 – Separate secondary protection is not necessary if the transformer is equipped with a coordinated thermal overload protection provided by the manufacturer.

Transformers

look like this

Figure 23

Fuse Application Guide

Applying Medium Voltage Fuses

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Using AC Motor Protection Tables to Select Fuse Ratings

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.

Selecting Fuses for Motor Running Protection

Based on Motor Horsepower

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 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.”

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 from the first column of that line.

Time Delay UL

Class RK1 or

RK5 Fuse

Ampere Rating

Motor Running Protection

(Used Without Properly Sized Overload

Relays) Motor Full-Load Amps

Back-up Motor Running Protection

(Used With Properly Sized Overload

Relays) Motor Full-Load Amps

Motor Service

Factor of 1.15 or

Greater or With

Temp. Rise Not

over 40°C.

Motor Service

Factor Less Than

1.15 or with Temp.

Rise Greater

Than 40°C.

Motor Service

Factor of 1.15 or

Greater or With

Temp. Rise Not

Over 40°C.

Motor Service

Factor Less Than

1.15 or with Temp.

Rise Greater

Than 40°C

1⁄10 0.08-0.09 0.09-0.10 0-0.08 0-0.09

1⁄80.10-0.11 0.11- 0.125 0.09 -0.10 0.10-0.11

15 ⁄100 0.12-0.15 0.14-0.15 0.11-0.12 0.12-0.13

2⁄10 0.16-0.19 0.18 -0.20 0.13-0.16 0.14-0.17

1⁄40.20-0.23 0.22-0.25 0.17-0.20 0.18-0.22

3⁄10 0.24-0.30 0.27-0.30 0.21-0.24 0.23-0.26

4⁄10 0.32-0.39 0.35-0.40 0.25-0.32 0.27-0.35

1⁄20.40-0.47 0.44-0.50 0.33-0.40 0.36-0.43

6⁄10 0.48-0.60 0.53-0.60 0.41-0.48 0.44-0.52

8⁄10 0.64-0.79 0.70-0.80 0.49-0.64 0.53-0.70

1 0.80-0.89 0.87-0.97 0.65-0.80 0.71-0.87

11⁄80.90-0.99 0.98-1.08 0.81-0.90 0.88-0.98

11⁄41.00-1.11 1.09-1.21 0.91-1.00 0.99-1.09

14⁄10 1.12-1.19 1.22-1.30 1.01-1.12 1.10-1.22

11⁄21.20-1.27 1.31-1.39 1.13-1.20 1.23-1.30

16⁄10 1.28-1.43 1.40-1.56 1.21-1.28 1.31-1.39

18⁄10 1.44-1.59 1.57-1.73 1.29-1.44 1.40-1.57

2 1.60-1.79 1.74-1.95 1.45-1.60 1.58-1.74

21⁄41.80-1.99 1.96-2.17 1.61-1.80 1.75-1.96

21⁄22.00-2.23 2.18-2.43 1.81-2.00 1.97-2.17

28⁄10 2.24-2.39 2.44-2.60 2.01-2.24 2.18-2.43

3 2.40-2.55 2.61-2.78 2.25-2.40 2.44-2.60

32⁄10 2.56-2.79 2.79-3.04 2.41-2.56 2.61-2.78

31⁄22.80-3.19 3.05-3.47 2.57-2.80 2.79-3.04

4 3.20-3.59 3.48-3.91 2.81-3.20 3.05-3.48

41⁄23.60-3.99 3.92-4.34 3.21-3.60 3.49-3.91

5 4.00-4.47 4.35-4.86 3.61-4.00 3.92-4.35

56⁄10 4.48-4.79 4.87-5.21 4.01-4.48 4.36-4.87

6 4.80-4.99 5.22-5.43 4.49-4.80 4.88-5.22

61⁄45.00-5.59 5.44-6.08 4.81-5.00 5.23-5.43

7 5.60-5.99 6.09-6.52 5.01-5.60 5.44-6.09

71⁄26.00-6.39 6.53-6.95 5.61-6.00 6.10-6.52

8 6.40-7.19 6.96-7.82 6.01-6.40 6.53-6.96

9 7.20 -7.99 7.83- 8.69 6.41-7. 20 6.9 7-7.8 3

10 8.00-9.59 8.70-10.00 7.21-8.00 7.84-8.70

12 9.60-11.99 10.44-12.00 8.01-9.60 8.71-10.43

15 12.00-13.99 13.05-15.00 9.61-12.00 10.44-13.04

171⁄214.00-15.99 15.22-17.39 12.01-14.00 13.05- 15.21

20 16.00-19.99 17.40-20.00 14.01-16.00 15.22-17.39

25 20.00-23.99 21.74-25.00 16.01-20.00 17.40-21.74

30 24.00-27.99 26.09-30.00 20.01-24.00 21.75-26.09

35 28.00-31.99 30.44-34.78 24.01-28.00 26.10-30.43

40 32.00-35.99 34.79-39.12 28.01-32.00 30.44-37.78

45 36.00-39.99 39.13-43.47 32.01-36.00 37.79-39.13

50 40.00-47.99 43.48-50.00 36.01-40.00 39.14-43.48

60 48.00-55.99 52.17-60.00 40.01-48.00 43.49-52.17

70 56.00-59.99 60.87-65.21 48.01-56.00 52.18-60.87

75 60.00-63.99 65.22-69.56 56.01-60.00 60.88-65.22

80 64.00-71.99 69.57-78.25 60.01-64.00 65.23-69.57

90 72.00-79.99 78.26-86.95 64.01-72.00 69.58-78.26

100 80.00-87.99 86.96-95.64 72.01-80.00 78.27-86.96

110 88.00-99.99 95.65-108.69 80.01-88.00 86.97-95.65

125 100.00-119.99 108.70-125.00 88.01-100.00 95.66-108.70

150 120.00-139.99 131.30-150.00 100.01-120.00 108.71-130.43

175 140.00-159.99 152.17-173.90 120.01-140.00 130.44-152.17

200 160.00-179.99 173.91-195.64 140.01-160.00 152.18-173.91

225 180.00-199.99 195.65-217.38 160.01-180.00 173.92-195.62

250 200.00-239.99 217.39-250.00 180.01-200.00 195.63-217.39

300 240.00-279.99 260.87-300.00 200.01-240.00 217.40-260.87

350 280.00-319.99 304.35-347.82 240.01-280.00 260.88-304.35

400 320.00-359.99 347.83-391.29 280.01-320.00 304.36-347.83

450 360.00-399.99 391.30-434.77 320.01-360.00 347.84-391.30

500 400.00-479.99 434.78-500.00 360.01-400.00 391.31-434.78

600 480.00-600.00 521.74-600.00 400.01-480.00 434.79-521.74

Motor Protection Tables

Selection of Class RK5 (FLNR_ID/FLSR_ID & IDSR Series) or POWR-PRO® Class RK1 (LLNRK/LLSRK/LLSRK_ID Series) Fuses Based

on Motor Full Load Amps

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Motor Protection Tables

Motor HP Full Load

Amps

Without Overload Relays With Overload Relays

Switch or

Fuse Clip

Rating

S.F. = 1.15 Or

More, Temp

Rise Not Over

S.F. = Less

Than 1.15 Or

Temp Rise

More Than

S.F. = 1.15 Or

More, Temp

Rise Not Over

S.F. = Less

Than 1.15 Or

Temp Rise

More Than

460 VOLT 3-PHASE MOTORS (480V CIRCUIT)

1⁄21.1 14⁄10 11⁄414⁄10 14⁄10 30

3⁄41.6 2 18⁄10 2230

12.12

1⁄221⁄428⁄10 21⁄230

11⁄23.0 31⁄232⁄10 43

1⁄230

23.4 4 3

1⁄241⁄2430

34.85

6⁄10 565

6⁄10 30

57.6 9 8 10 9 30

71⁄211 12 12 15 15 30

10 14 171⁄215 171⁄2171⁄230

15 21 25 20 30 25 30

20 27 30* 30* 35 35 60

25 34 40 35 45 40 60

30 40 50 45 50 50 60

40 54 60* 60* 70 60* 100

50 65 80 70 90 75 100

60 77 90 80 100 90 100

75 96 110 110 125 125 200

100 124 150 125 175 150 200

125 156 175 175 200 200 200

150180 225200*225 225 400

200 240 300 250 300 300 400

575 VOLT 3-PHASE MOTORS (600V CIRCUIT)

1⁄20.9 11⁄811

1⁄811⁄830

3⁄41.3 16⁄10 14⁄10 16⁄10 16⁄10 30

11.7 2 1

8⁄10 21⁄4230

11⁄22.4 3 21⁄23330

22.73

2⁄10 28⁄10 31⁄232⁄10 30

33.94

1⁄2454

1⁄230

56.17

1⁄2787

1⁄230

71⁄291010121230

10 11 12 12 15 15 30

15 17 20 171⁄225 20 30

20 22 25 25 30 30 30

25 27 30* 30* 35 35 60

30 32 40 35 40 40 60

40 41 50 45 60 50 60

50 52 60 60 70† 60 60

60 62 75 70 80 75 100

75 77 90 80 100 90 100

100 99 110 110 125 125 200

125 125 150 125 175 150 200

150 144 175 150 200 175 200

200 192 225 200* 250 225 400

NOTES

S.F. = Motor Service Factor

* Fuse Reducers Required

† 100 Amp Switch Required

Selection of Class RK5 (FLNR_ID/FLSR_ID & IDSR Series) or POWR-PRO® Class RK1 (LLNRK/LLSRK/LLSRK_ID Series) Fuses

Based on Motor Horsepower

Motor HP Full Load

Amps

Without Overload Relays With Overload Relays

Switch or

Fuse Clip

Rating

S.F. = 1.15 Or

More, Temp

Rise Not Over

S.F. = Less

Than 1.15 Or

Temp Rise

More Than

S.F. = 1.15 Or

More, Temp

Rise Not Over

S.F. = Less

Than 1.15 Or

Temp Rise

More Than

120 VOLT 1-PHASE MOTORS (120V CIRCUIT)

1⁄64.4 5 5 56⁄10 56⁄10 30

1⁄45.8 7 61⁄471⁄2730

1⁄37.2989930

1⁄29.8 12 10 15 12 30

3⁄413.8 15 15 171⁄2171⁄230

116 2017

1⁄220 20 30

11⁄220 25 20 25 25 30

224 30 25 30 30 30

230 VOLT 1-PHASE MOTORS (240V CIRCUIT)

1⁄62.2 21⁄221⁄228⁄10 28⁄10 30

1⁄42.9 31⁄232⁄10 43

1⁄230

1⁄33.6 41⁄244

1⁄241⁄230

1⁄24.9 56⁄10 56⁄10 61⁄4630

3⁄46.9 8 71⁄29830

18 10 9 101030

11⁄210 12 10 15 12 30

2121512151530

317 2017

1⁄225 20 30

5 28 35 30* 35 35 60

71⁄240 50 45 50 50 60

10 50 60 50 70 60 60

200 VOLT 3-PHASE MOTORS (208V CIRCUIT)

1⁄22.5 3 28⁄10 32⁄10 330

3⁄43.7 41⁄2454

1⁄230

14.8 6 5

6⁄10 61⁄4630

11⁄26.9 8 71⁄271⁄2830

27.8 9 8 10 9 30

311 12 12 15 15 30

517.5 20 20 25 25 30

71⁄225.3 30* 25* 35 30* 60

10 32.2 40 35 45 40 60

15 48.3 60 50 70† 60 60

20 62.1 75 70 80 75 100

25 78.2 90 80 100 90 100

30 92 110 100* 125 110 200

40 120 150 125 150 150 200

50 150 175 150 200 175 200

60 177 200* 200* 225 225 400

75 221 250 250 300 300 400

100 285 350 300 400 350 400

125 359 400* 400* 450 450 600

150 414 500 450 600 500 600

230 VOLT 3-PHASE MOTORS (240V CIRCUIT)

1⁄22.2 28⁄10 21⁄228⁄10 28⁄10 30

3⁄43.2 4 31⁄24430

14.2 5 4

1⁄256⁄10 530

11⁄26.0 71⁄261⁄471⁄271⁄230

26.8 8 7

1⁄29830

3 9.6 12 10 12 12 30

515.217

1⁄2171⁄220 171⁄230

71⁄222 25 25 30 30 30

10 28 35 30* 35 35 60

15 42 50 45 60 50 60

20 54 60* 60* 70 70 100

25 68 80 75 90 80 100

30 80 100 90 100 100 100

40 104 125 110 150 125 200

50 130 150 150 175 150 200

60 154 175 175 200 200 200

75 192 225 200* 250 225 400

100 248 300 250 350 300 400

125 312 350 350 400 400 400

150 360 450 400* 450 450 600

200 480 600 500 600 600 600

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Motor F.L.A. JTD_ID/JTD

Ampere Rating Motor F.L.A. JTD_ID/JTD

Ampere Rating

0.00 – 0.60 8⁄10 12.1 – 14.5 17 1/276.1 – 84.0 110

0.61 – 0.80 1 14.6 – 17.0 20 84.1 – 90.0 125

0.81 – 1.00 11⁄417.1 – 21.0 25 90.1 – 102 150

1.01 – 1.20 11⁄221.1 – 25.0 30 103 – 125 175

1.21 – 1.65 2 25.1 – 28.5 35 126 – 144 200

1.66 – 2.00 21⁄228.6 – 34.0 40 145 – 162 225

2.01 – 2.40 3 34.1 – 37.0 45 163 – 180 250

2.41 – 3.30 4 37.1 – 41.0 50 181 – 204 300

3.31 – 4.10 5 41.1 – 48.0 60 205 – 240 350

4.11 – 4.90 6 48.1 – 52.0 70 241 – 288 400

4.91 – 6.40 8 52.1 – 59.0 80 289 – 312 450

6.41 – 8.00 10 59.1 – 66.0 90 313 – 360 500

8.01 – 9.80 12 66.1 – 76.0 100 361 – 432 600

9.81 – 12.0 15

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 POWR-PRO® Class J (JTD_ID/JTD Series) Fuses

Based on Motor Full Load Amps

Motor Full Load Current (F.L.A.)

CCMR

Ampere Rating

For Motors With An Acceleration

Time Of 2 Seconds Or Less

For Motors With An Acceleration

Time Of 5 Seconds Or Less

For Motors With An Acceleration

Time Of 8 Seconds Or Less

Min. F.L.A. (1) Max F.L.A. (3) Min. F.L.A. (1) Max F.L.A. (3) Min F.L.A. (2) Max F.L.A. (3)

0.2 0.2 0.2 0.2 0.2 0.2 3⁄10

0.3 0.4 0.3 0.4 0.3 0.3 1⁄2

0.4 0.6 0.4 0.5 0.4 0.5 8⁄10

0.5 0.7 0.5 0.6 0.5 0.6 1

0.6 1.0 0.6 0.9 0.6 0.8 11⁄4

0.8 1.1 0.8 1.0 0.7 0.9 11⁄2

0.9 1.3 0.9 1.1 0.8 1.0 18⁄10

1.1 1.4 1.1 1.2 0.9 1.1 2

1.2 2.1 1.2 2.1 1.2 1.8 21⁄2

1.5 2.6 1.5 2.6 1.4 2.3 3

1.8 3.0 1.8 3.0 1.6 2.6 3 1⁄2

2.1 3.4 2.1 3.2 1.8 2.8 4

2.3 3.9 2.3 3.3 2.0 2.8 41⁄2

2.6 4.3 2.6 3.4 2.3 2.8 5

2.9 4.8 2.9 3.7 2.5 3.1 56⁄10

3.3 5.2 3.3 4.0 2.7 3.4 6

3.5 5.4 3.5 4.1 2.8 3.5 61⁄4

3.6 5.7 3.6 4.2 3.2 3.7 7

4.1 5.8 4.1 4.3 3.4 3.8 71⁄2

4.3 6.2 4.3 4.6 3.6 4.2 8

4.6 6.9 4.6 5.2 4.0 4.5 9

5.2 7.7 5.2 5.8 4.5 4.9 10

5.8 8.9 5.8 6.6 5.4 5.5 12

6.9 10.0 6.9 7.7 6.7 6.7 15

8.9 13.5 8.9 10.0 6.8 9.0 20

11.5 15.8 11.2 (2) 11.8 9.0 11.0 25

14.3 17.8 13.4 (2) 13.4 10.0 15.0 30

20.7 23.3 16.1 17.9 15.6 15.9 35

23.7 26.7 18.4 20.5 17.8 18.2 40

26.6 30.0 20.7 23.1 20.0 20.4 45

30.0 33.3 23.0 25.6 22.3 22.7 50

35.5 40.0 27.6 30.1 26.7 27.3 60

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 300% of

motor F.L.A.

3 Based on Littelfuse CCMR time-delay characteristics.

Selection of CCMR Time-Delay Fuses Based on Motor Full Load Amps

NOTE: These values were calculated for motors with Locked Rotor

Current (LRA), not exceeding the following values:

Motor F.L.A. *LRA

0.00 – 1.00 850%

1.01 – 2.00 750%

2.01 – 10.0 650%

10.1 – 17.8 600%

*If motor LRA varies from these values, contact Littelfuse.

Motor Protection Tables

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Condensed Cross Reference

Power/Electronic Fuses

This cross reference covers most popular fuses for which there is a similar Littelfuse standard item. Furnished for your con ve nience, 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,

consult the factory.

For more complete information, and for fuse block and medium voltage fuse cross referencing, send for Cross Reference Booklet EC501

or call 1-800-TEC-FUSE (1-800-832-3873).

Competition Littelfuse Competition Littelfuse Competition Littelfuse Competition Littelfuse

10KOTN NLN CLL KLLU or KLPC JHC JTD_ID NCLR KLNR

10KOTS NLS CLU KLLU or KLPC JJN JLLN NON NLN

50KOTN NLN CM BLF JJS JLLS NOS NLS

50KOTS NLS CMF BLN JKS JLS NRN NLN

A251 CNM FLM KAA L15S NRN (15-60A) NLKP

A013F L15S CNQ FLQ KAB L25S NRS NLS

A015F L15S CRN-R FLNR_ID (note 3) KAC KLC OT NLN

A015R L15S CRS-R FLSR_ID KBH L50S OTM BLF or BLN

A025F L25S CSF13X L15S KLM KLKD OTN NLN

A050F L50S CSF25X L25S (AC only) KLMR CCMR OTS NLS

A060F L60S CSF50P L50S KLU KLLU or KLPC REN RLN

A060URL KLK CSF60C KLC (AC only) KN KLNR RES RLS

A070F L70S CSF60X L60S (AC only) KON NLN RF RLN

A13X L15S CSF70P L70S KOS NLS RFA L15S

A25X L25S (AC only) CTN-R KLNR KRPC (SP) KLPC RFC KLC

A2D-R LLNRK CTS-R KLSR KRPC-L KLPC RFL (750V) L70S (700V)

A2K-R KLNR EBS BLS KS KLSR RFN (Ferraz) RLN

A3T JLLN ECNR FLNR_ID (note 3) KTK KLK RFS (Ferraz) RLS

A4BQ KLPC ECSR FLSR_ID KTKR KLKR RFV L50S

A4BT KLLU or KLPC ELN LKN KTNR KLNR RHN KLNR

A4BY KLPC or KLLU ELS LKS KTSR KLSR RHS KLSR

A4J JLS ERN RLN KTU KLPC RLN (Ferraz) LKN

A50P (type 1 & 4) L50S ERS RLS LKLLU or KLPC RLS (Ferraz) LKS

A60X L60S FNA FLA LCL KLPC or KLLU SSOO

A6D-R LLSRK_ID FNB 235 LCU KLPC or KLLU SA SAO

A6K-R KLSR FNM FLM LENRK LLNRK SC SLC

A6T JLLS FNQ FLQ LESRK LLSRK_ID SCLR KLSR

A70P L70S FNQ-R KLDR LKN LKN SEC SLC

ACK CCK FRN-R FLNR_ID (note 3) LKS LKS SF13X L15S

AG SLC FRS-R FLSR_ID LKU KLLU SF25X L25S

AGA AGA FWA (note 2) L15S LONRK LLNRK SF50P L50S

AGC 312 FWH (note 2) L50S LOSRK LLSRK_ID SF60X L60S

AGU (1-30A) BLN FWP (note 1) L70S LPCC CCMR SF70P L70S

AGW AGW FWX (note 1) L25S LPJ (SP) JTD_ID SFE SFE

AJT JTD_ID GDA 216 LPNRK (SP) LLNRK SL SLO

ANL CNL GDB 217 LPSRK (SP) LLSRK_ID TTOO

ANN CNN GDC 218 MCL KLK TJN JLLN

ATC ATO (257) GDL 313 MDA 326 TJS JLLS

AT-DE FLNR_ID (note 3) GEB LEB MDL 313 TL TLO

ATDR CCMR GEBN LET MDQ 313 TR FLNR_ID (note 3)

ATM KLK GFA 251 MDV 315 TRM FLM

ATMR KLKR GFN FLA MDX 313 TRN-R FLNR_ID (note 3)

ATQ FLQ GGC 312 MEN FLM TRS FLSR_ID

ATQR KLDR GGM 235 MEQ FLQ TRS-R FLSR_ID

AX 481 GLR LGR MID FLA XL25X L25S

AXRAD 252 GMT 481 MOF BLN XL50F L50S (note 1)

BAF BLF HCLR KLKR MOL BLF XL70F L70S (note 1)

BAN BLN HCTR KLDR MTH 312

BBS BLS HEB LEB 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.

Remember 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 higher rated voltage than the fuse.

CGL (2-100A) 2CO HET LET

CGL (125-600A) 2CC HLR LHR

CJ JLS JJLS

CJS JLS JDL JTD_ID

CLF KLPC or KLLU JFL JLS

Fuseology

208 www.littelfuse.com

Fuseology

Alphanumeric Index of Catalog Numbers

Arc-Flash 177

ATO series 60

BLF series 51

BLN series 51

BLS series 52

Box Cover Units 158-159

CablePro®62

CBO series 107

CCK series 107

CCL series 107

CCMR series 20-21, 45-47

Class CC 20-21, 45-47

Class CD 20-21, 45-47

Class G 44

Class H 38

Class J 17-19, 39-40

Class K5 36-37

Class L 8-10, 23-24,

26-28

Class RK1 11-16, 34-35

Class RK5 22, 29-33

Class T 41-43

CNL series 107

CNN series 107

CYHP001 128, 168

Cylindrical Fuses 168

Diazed Fuses 166-167

Definitions 177-181

Distribution Blocks 137-144

Electrical Safety 182-183

Electronic Fuses 55-59

E-Rated Fuses 69-74

European Fuses 161-169

FBDIN1 127

FDR001PG 160

FLA series 52

FLM series 50

FLNR series 33

FLNR_ID series 29-32

FLQ series 51

FLSR series 33

FLSR_ID series 29-32

FLU series 53

Fuse Blocks 126

Fuseology 172-206

Fuse Reducers 157

GFP 131

IDSR series 22

ILS series 135-136

Inline Fuseholders 145-150

JCASE series 62

JLLN series 41-43

JLLS series 41-43

JLS series 39-40

JTD_ID series 17-19

KLC series 85, 87

KLDR series 45-47

KLK series 50

KLKD series 50

KLKR series 45-47

KLLU series 26-28

KLNR series 34-35

KLPC series 8-10

KLQ series 53

KLSR series 34-35

L15S series 85-86

L17T series 77

L25S series 85-86

L30030G series 124

L50S series 85-86

L60030C series 125-126

L60030M series 125-126

L60060C series 125-126

L60S series 85, 87

L70S series 85, 87

LA15QS 88-89

LA30QS 90-91

LA50QS 92-93

LA60QS 94

LA60X 95

LA70QS 96-98

LA100P 99-100

LA120X 101

LA070URD 102-104

LA130URD 102, 105-106

LCC series 131

LD series 137-144

LDC series 23-24

LEB series 145-150

LEC series 145-150

LET series 145-150

LEX series 145-150

LEY series 145-150

LFCL series 108

LFDS series 156

LFFB001 133

LFFS030CC 156

LG300 series 124

LgD series 5, 162

LGR series 109

Live Parts 75

LH250 series 112-116

LH250-PC series 130

LH600 series 112-116

LH600-PC series 130

LHFB 133

LHR series 108

LJ600 series 117-119

LJ600-PC series 130

LKN series 38

LKS series 38

LLNRK series 14-16

LLSRK series 14-16

LLSRK_ID series 11-13

LMF series 109

LNNB 53

LPFP 131

LPBC series 138

LPMP series 154-155

LPS1 152-153

LPS2 152-153

LPS3 152-153

LPS4 152-153

LPS6 152-153

LPSC series 128

LPSG series 163

LPSJ series 129

LPSM series 128

LR250 series 112-116

LR600 series 112-116

LRU series 157

LS series 137-144

LSCR series 134

LSCY 158-159

LSFC 160

LSKA 158-159

LSOU 158-159

LSOW 158-159

LSOX 158-159

LSOY 158-159

LSOY-B 158-159

LSRU 158-159

LSRW 158-159

LSRX 158-159

LSRY 158-159

LSSU 158-159

LSSW 158-159

LSSX 158-159

LSSY-L 158-159

LSSY-RL 158-159

LST Y 158-159

LT300 series 120-123

LT600 series 120-123

LTFD series 81-82

LVSP series 174

MAX series 60

Medium Voltage 63-75

MEGA series 61

MFP 131

MIDI series 61

MIN series 60

MOV 173

MROplus 6

Neozed Fuses 166-167

NH Fuse Links 164-165

NLKP series 36-37

NLN series 36-37

NLS series 36-37

Overvoltage 170-174

Plug Fuses 48

PT Fuses 74

RLN series 38

RLS series 38

R-Rated Fuses 65-68

SAO series 48

Semiconductor Fuses 83-106

SFE series 60

SLC series 44

SLO series 48

SOO series 48

SPL001 127

Splicer Blocks 137-144

Suppression 170-174

Telecom Fuses 76-80

TLN series 78

TLO series 48

TLS series 79

TMOV 173

TOO series 48

US3J series 129

US6J series 129

WPB series 147

094324PG 160

215 series 57

216 series 57

217 series 57

218 series 57

224 series 58

225 series 58

229 series 56

230 series 56

235 series 58

239 series 58

251 series 59

252 series 59

257 series see ATO

272 series 59

273 series 59

278 series 59

279 series 59

297 series see MIN

299 series see MAX

2CC series 169

2CM series 169

2CO series 169

312 series 55

313 series 55

313_ID series 56

314 series 55

315 series 55

318 series 55

324 series 55

325 series 55

326 series 55

334 series 56

473 series 59

481 series 80

496 series 62

498 series 61

571 series 132

572 series 132

70 series 80

700 series 75

Catalog Number Page Number Catalog Number Page Number Catalog Number Page Number Catalog Number Page Number

Littelfuse®

POWR-GARD™ Products

Littelfuse provides our customers with a comprehensive range of

electrical products used to protect:

• Industrial motors and drives

• Pumps and compressors

• Power distribution circuits and wiring devices

• Medium voltage power distribution grids

• Lighting circuits

At Littelfuse we are committed to partnering with our

customers. That means not only providing the right circuit

protection solution, but also offering services that will

continually add value to your initiatives:

MROplusTM : (Material Reduction

Opportunity plus, the industry’s

best indicating fuse line)

Improve performance while lowering operational costs – for free.

When you use our MROplus program, our technical service

professionals will run a free comprehensive fuse analysis,

evaluating your current purchases and complete fuse inventory,

including identification of duplicate and obsolete fuses. After

the analysis you will receive a detailed report with streamlining

recommendations, annual cost savings estimates and ways to

improve safety and decrease downtime.

Techline

800-TEC-FUSE ( 800-832-3873 )

Our technical hotline is available 8:00 a.m. – 4:30 p.m. CST.

The Littelfuse technical specialists are there to answer questions,

assist in cross-references and provide application expertise.

Littelfuse®

POWR-GARD™ Services Designed to Add Value

www.littelfuse.com

Littelfuse

Safety Program

Did you know that 97% of all electricians have been shocked

or injured on the job? To help you increase safety in your facility

Littelfuse offers the following:

• Current-Limiting Fuses and Accessories

• Electrical Safety Literature and Arc-Flash Calculators

• Electrical Safety Video

• Training Seminars and Presentations

• MROplus Fuse Inventory Analysis

• Technical Support and Engineering Services

Littelfuse safety experts are here to help you stay safe on the job.

We can assist you in developing an Electrical Safety Program in

your own facility.

24-Hour Emergency Fuse Service

847-824-1188

Our Emergency Fuse Service is available 24 hours a day, seven

days a week — even on holidays. Just call our emergency fuse

service number and one of our trained service agents will be

happy to help you.

When looking for the right solutions, companies around the

world count on the expertise of Littelfuse – the global leader

in circuit protection.

FORM NO. PF101-11

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 www.littelfuse.com for the most up-to-date

technical information. Littelfuse reserves the right to change the design or construction of any product

without notice.

International Sales,

Distribution and

Engineering Facilities:

North America

• Des Plaines, Illinois USA

and Irving, Texas USA

Technical Assistance

Phone: 800 TEC FUSE

847 824 1188

Fax: 217 268 5094

Europe

• Dünsen, Germany

Phone: +49 4244 8190

Fax: +49 4244 819 139

• Eltville, Germany

Phone: +49 6129 460

Fax: +49 6129 46222

• Kaposvár, Hungary

Phone: +36 8250 8335

Fax: +36 8241 7529

• Munich, Germany

Phone: +49 8955 27660

Fax: +49 8955 276 699

• Utrecht, The Netherlands

Phone: +31 30 299 9900

Fax: +31 30 299 9800

• Swindon, United Kingdom

Phone: +44 179 372 0400

Fax: +44 179 372 0401

Asia/Paciﬁ c

• Hong Kong, China

Phone: +852 2810 5099

Fax: +852 2810 5500

• Beijing, China

Phone: +86 10 8454 9408

Fax: +86 10 8454 9409

• Shanghai, China

Phone: +86 21 5383 8016

Fax: +86 21 5383 7476

• Shenzhen, China

Phone: +86 755 8207 0760

Fax: +86 755 8207 0759

• Singapore

Phone: +65 6885 9111

Fax: +65 6885 9113

• Shin-Yokohama, Japan

Phone: +81 45 478 1088

Fax: +81 45 478 1089

• Seoul, Korea

Phone: +82 2 6000 8600

Fax: +82 2 6000 8655

• Taipei, Taiwan

Phone: +886 2 8751 1234

Fax: +886 2 8751 1177

Central and South America

• São Paulo, Brasil

Phone: +55 113 835 3780

Fax: +55 113 645 0612

Research and

Manufacturing Facilities:

• Arcola, Illinois USA

• Des Plaines, Illinois USA

• Dongguan, China

• Dundalk, Ireland

• Dünsen, Germany

• Eltville, Germany

• Grenchen, Switzerland

• Irving, Texas USA

• Lipa City, Philippines

• Matamoros, Mexico

• Piedras Negras, Mexico

• Siemianowice Slaskie, Poland

• Suzhou, China

• Swindon, United Kingdom

• Uebigau, Germany

• Witten, Germany

Other Catalogs Available

• Electronic Designer’s Guide

• Teccor® Power Thyristor Databook

• Automotive OEM Catalog

• Automotive Aftermarket Catalog

World Headquarters

Littelfuse, Inc.

800 E. Northwest Highway

Des Plaines, IL 60016 USA

www.littelfuse.com

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