Electronic Trip Insulated Case Circuit Breakers 121853 Catalog

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Data Bulletin

0603DB0102
June 2001
Cedar Rapids, IA, USA

Electronic Trip Insulated Case
Circuit Breakers
Class 603

CONTENTS
Description
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MICROLOGIC® Trip System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Circuit Breaker Specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Electronic Trip Insulated Case Circuit Breakers

TABLE OF CONTENTS

Bulletin No. 0603DB0102
June 2001

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
What Are Electronic Trip Insulated Case Circuit Breakers? . . . . . . . . . . . .4
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Why Use Electronic Trip Insulated Case Circuit Breakers? . . . . . . . . . . . . .4
MICROLOGIC® Trip Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
What Do These Benefits Mean to a Customer? . . . . . . . . . . . . . . . . . . . . .5
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Circuit Breaker Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Trip System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Instantaneous OFF Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Maintenance and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Performance and Verification Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
MICROLOGIC® TRIP SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
RMS Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Rating Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Ammeter/Trip Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Memory Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Equipment Ground-fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Zone-selective Interlocking (ZSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Trip Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Full-function Trip Unit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
CIRCUIT BREAKER SPECIFICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
UL Listed Interrupting Ratings (In RMS Symmetrical Amperes) . . . . . . . .19
SEF Circuit Breaker Mounted Dimensions . . . . . . . . . . . . . . . . . . . . . . . .21
SED/SEHD Circuit Breaker Drawout Dimensions . . . . . . . . . . . . . . . . . . .22
Neutral Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Trip Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Electric Joint Compound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Electronic Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
SE Field-replaceable Accessory Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Factory-installed Device Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Shunt (Remote) Close Replacement Kit . . . . . . . . . . . . . . . . . . . . . . . . . .31
Shunt Trip Replacement Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Undervoltage Trip Replacement Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Auxiliary Switch Replacement Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Alarm Switch Replacement Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Push-to-open Padlock Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Close Button Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Primary Injection Test Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
SE Drawout Crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Interlocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Key Interlocks (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

2
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers

Undervoltage Trip/Close Button Interlock . . . . . . . . . . . . . . . . . . . . . . . . .34
Auxiliary Cover Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Trip Unit Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Cell Door Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Access Cover Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Drawout Mechanism Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Drawout Carriage Padlock Hasp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
OEM Drawout Carriage Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
SE 4000 A Circuit Breaker Cooling Fan . . . . . . . . . . . . . . . . . . . . . . . . . .36
GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

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06/01

Electronic Trip Insulated Case Circuit Breakers
Introduction

Bulletin No. 0603DB0102
June 2001

INTRODUCTION
What Are Electronic Trip Insulated Case
Circuit Breakers?

Electronic trip insulated case circuit breakers are designed to protect electrical
systems from damage caused by overloads, short circuits and ground faults. All
circuit breakers are designed to open and close a circuit by nonautomatic means,
and to open the circuit automatically on a predetermined overcurrent. Insulated
case circuit breakers can also
• enhance coordination by their adjustability
• provide integral equipment ground-fault protection
• provide capacity for future growth
• provide zone-selective interlocking for increased selectivity in the electrical
system
Electronic trip insulated case circuit breakers manufactured by Square D use the
MICROLOGIC® electronic trip system to sense overcurrents and trip the circuit
breaker. All electronic trip insulated case circuit breakers are manufactured with
a full-function trip system.
• Part 1 of this catalog, General Information, provides an overview of electronic
trip insulated case circuit breakers.
• Part 2—MICROLOGIC Trip System provides information about the electronic
trip system used in these circuit breakers.
• Part 3—Sensor/Ampere Ratings describes the insulated case circuit breakers
available from Square D.
• Part 4—Accessories lists the accessories available for use with electronic trip
insulated case circuit breakers.
For information on other types of molded case circuit breakers manufactured by
Square D, see the data bulletinsThermal-Magnetic and Magnetic Only Molded
Case Circuit Breakers and Electronic Trip Molded Case Circuit Breakers, which
are also available from Square D.

Standards

Square D electronic trip molded case circuit breakers are manufactured and
tested in accordance with the following standards:
• UL Standard 489
• NEMA Standard AB1
• CSA Standard C22.2, No. 5.1 (SEF and SEHF)
• Federal Specification W-C-375B/GEN as Class 25a
Circuit breakers are applied according to guidelines detailed in the National
Electrical Code (NEC) and other local electrical wiring codes.

Why Use Electronic Trip Insulated Case
Circuit Breakers?

MICROLOGIC electronic trip circuit breakers provide the same basic functions as
standard thermal-magnetic circuit breakers.
Both types of circuit breakers:
• provide overload and short-circuit protection
• are true rms sensing devices
• provide means to manually disconnect power to the circuit
• meet UL, CSA and NEMA standards

4
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Introduction

MICROLOGIC® Trip Unit Features

Full-function Circuit Breakers
• 100% rated
• True root-mean-square (rms) sensing
• 80–4000 A continuous current ratings
• LI, LIG, LS(I), LS(I)G trip configurations
• Interchangeable rating plugs
• Overload indicating light
• Short-time withstand rating
• Defeatable instantaneous feature option (on LS trip only)
• Integral equipment ground-fault protection and testing option
• Integral equipment ground-fault alarm (no trip) option
• Zone-selective interlocking
• Local electronic trip indicator
• Local current meter
• Universal test set available
• Neutral current transformer for 4-wire systems available
• POWERLOGIC® communications
However, MICROLOGIC electronic trip circuit breakers offer a variety of benefits in
addition to these basic functions. MICROLOGIC circuit breakers can
• provide adjustability for enhanced coordination
• provide integral ground-fault protection or alarm
• measure and report inherent ground-fault leakage current on a system
• provide capacity for future growth using
— rating plugs
— long-time pickup switch
— 100% rated full-function trip system
• provide zone-selective interlocking to reduce fault stress on the electrical
system
• be provided with power monitoring communications

What Do These Benefits Mean to a
Customer?

MICROLOGIC circuit breakers give the customer more versatility to achieve
coordination with features such as adjustable pickup and delay points,
interchangeable rating plugs and withstand ratings. Features such as universally
interchangeable rating plugs, adjustable long-time pickups and 100% ratings
provide capacity for future growth.
Integral equipment ground-fault sensing capabilities mean that there are fewer
parts and pieces to buy, mount and wire. Square D offers products with integral
equipment ground-fault protection which trip when a ground-fault is detected as
well as products with integral equipment ground-fault alarm which do not trip but
send an alarm that a ground fault is detected.
MICROLOGIC full-function circuit breakers also offer the customer true power
management system solutions through communications. The full-function trip units
can communicate with other circuit breakers in the system and also with a power
monitoring system.
Communication between circuit breakers allows zone-selective interlocking (ZSI)
between circuit breakers at different levels in the system. ZSI reduces fault stress
by allowing the upstream circuit breaker closest to the fault to ignore its preset delay
time and trip without any intentional delay on a short circuit or ground fault. For
more information on ZSI, see data bulletin Reducing Fault Stress with Zoneselective Interlocking.
Communication with a power monitoring system through a POWERLOGIC
communications link allows a ground fault to be reported without interrupting power
to the system. It also allows the power monitoring system to remotely report power
usage, current flow and trip history. For more information on POWERLOGIC
system capabilities, see publication POWERLOGIC® Product Interface for
MICROLOGIC® Circuit Breakers.
5

06/01

Electronic Trip Insulated Case Circuit Breakers
General Information

Bulletin No. 0603DB0102
June 2001

GENERAL INFORMATION
Specifications

Electronic trip insulated case circuit breakers have a molded case made of a glassreinforced insulating material that provides high dielectric strength. These circuit
breakers
• have a true, 2-step, stored energy closing mechanism
• have fixed or drawout mounting
• have mechanical push-to-open and push-to-close buttons
• have normal power and control power terminations
• have position indication for contacts and closing springs
• share common tripping of all poles
• can be mounted and operated in any position
• meet the requirements of NEC Section 240-6 by providing a means to seal the
rating plug and trip unit adjustments
• are equipped with an externally accessible test port for use with a universal
test set
• are fully tested, UL Listed and CSA Certified for reverse connection without
restrictive LINE or LOAD markings.

Circuit Breaker Ratings
VOLTAGE RATINGS

Voltage ratings indicate the maximum voltage for the electrical system on which the
circuit breaker can be applied. All Square D electronic trip insulated case circuit
breakers are designed to be applied on systems rated 600 Vac or less. They are
not designed for use on dc systems.

AMPERE RATING

The ampere rating of an electronic trip circuit breaker is the maximum current that
a circuit breaker can carry. It is determined by the mathematical equation:
Ampere
Sensor
Rating
(S) x Plug %
Rating (P) = Size

• The circuit breaker sensor size is the maximum ampere rating possible for a
specific circuit breaker. This value is based on the size of the current sensor
inside the circuit breaker. (Current sensors are an integral part of the circuit
breaker and cannot be removed or replaced.)
NOTE: The maximum ampere rating a circuit breaker family can carry is called
the frame size. Sensor size is less than or equal to frame size.
• The rating plug varies the circuit breaker ampere rating as a function of its
sensor size. (The rating plug catalog number is ARPXXX, with XXX being the
multiplier value.) This multiplier value is printed on the faceplate of the rating
plug along with the mathematical equation used to obtain the ampere rating.
CONTINUOUS CURRENT RATING

The continuous current rating of an electronic trip circuit breaker is determined by
the mathematical equation:
Continuous
Ampere
Long-time
Current Rating = Rating (P) x Setting

• The circuit breaker ampere rating (P) is found by multiplying the circuit breaker
sensor size by the rating plug multiplier.
• The long-time pickup switch varies the circuit breaker continuous current rating
as a multiple of the ampere rating. Switch positions are adjustable from 0.5 to
1.0.
FREQUENCY RATING

Electronic trip circuit breakers are recommended for applications only on systems
at 50/60 Hz. These circuit breakers have not been evaluated at any other
frequency.

6
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

INTERRUPTING RATING

Electronic Trip Insulated Case Circuit Breakers
General Information

The interrupting rating is the highest current at rated voltage the circuit breaker is
designed to safely interrupt under standard test conditions. Circuit breakers must
be selected with interrupting ratings equal to or greater than the available shortcircuit current at the point where the circuit breaker is applied in the system
(unless it is a branch device in a series rated combination). Interrupting ratings
are shown on the faceplate of the circuit breaker.
Table 1: Interrupting Ratings
Circuit Breaker

UL Listed Interrupting Rating*
(rms symmetrical amperes)
240 Vac

480 Vac

SEF, SED

150,000

100,000

85,000

SEHF, SEHD

200,000

150,000

100,000

600 Vac

*Interruption rating is value shown or interruption rating of switchboard, whichever is lower.

WITHSTAND RATING

The short-time withstand rating of a circuit breaker is the level of rms symmetrical
current that a circuit breaker can carry with the contacts in a closed position for a
stated period of time (usually 30 cycles).
The withstand rating is used to improve coordination by maximizing the current
level at which the circuit breaker trips with no intentional delay. For more
information on coordination using withstand ratings, see data bulletin Circuit
Breaker Characteristic Trip Curves and Coordination. Square D recommends a
system coordination study be done for optimum circuit breaker coordination.
Table 2: 30 Cycle Withstand Ratings
Circuit Breaker

100% RATING

Withstand Rating at 600 V

SEF, SED

50 kA

SEHF, SEHD

65 kA

The full-function electronic trip insulated case circuit breakers are UL Listed to be
applied at up to 100% of their continuous current rating.
Because of the additional heat generated when applying circuit breakers at 100%
of continuous current rating, the use of specially designed enclosures and 90°C
rated conductors is required.
Table 3: Minimum Enclosure Size for 100% Rating
Circuit Breaker

Enclosure Size*

SEF 400–1600

29.5 H x 30 W in, min. vol. 31,860 in3
749 H x 762 W mm, min. vol. 809,244 mm3

SED 400–1600

29.5 H x 30 W in, min. vol. 42,480 in3
749 H x 762 W mm, min. vol. 1,078,992 mm3

SEF 2000–3000

29.5 H x 36 W in, min. vol. 38,232 in3
749 H x 914 W mm, min. vol. 971,093 mm3

SED 2000–3000

29.5 H x 36 W in, min. vol. 50,976 in3
749 H x 914 W mm, min. vol. 1,294,790 mm3

SEF, D 4000

90 H x 42 W x 48 D in, 3PH3W
2286 H x 1067 W x 1219 D mm, 3PH3W
90 H x 48 W x 48 D in, 3PH4W
2286 H x 1219 W x 1219 D mm, 3PH4W

*Additional width is required for neutral bussing if 3PH4W service entrance is used.
*Additional width and/or height is required if the enclosure is front accessible only
and/or accessories are included.

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06/01

Electronic Trip Insulated Case Circuit Breakers
General Information

Bulletin No. 0603DB0102
June 2001

It is recommended that tests be conducted per UL Standard 891 if any one or
combination of the following exist:
1. More than one device is mounted in a single section.
2. The section width is less than the standard.
3. The compartment height is less than the standard.
4. The volume is less than the standard.
Markings on the circuit breaker indicate minimum enclosure size and ventilation
specifications required. The 90°C wire must be sized according to the ampacities
of the 75°C wire column in the NEC.
Circuit breakers with 100% ratings can also be used in applications requiring only
80% continuous loading.
To meet the requirements of UL Standard 489, molded case circuit breakers are
designed, built and calibrated for use on 50/60 Hz ac systems. Electronic trip circuit
breakers, however, are designed to react only to the magnitude of the current
flowing through the circuit breaker. MICROLOGIC electronic trip circuit breakers
are inherently ambient insensitive in the range of -5°C to +60°C.

Trip System

The trip system causes the circuit breaker to open automatically under overload,
short-circuit or ground-fault conditions. The MICROLOGIC trip system consists of
the current sensors, a microprocessor-based trip unit, and a tripping coil. The
tripping coil is a flux transfer solenoid which requires no external power source. All
MICROLOGIC protective functions are completely fault powered. The trip system
operation and adjustments are fully described later in this data bulletin.

06033001

AMBIENT TEMPERATURE RATING

Trip Unit

Trip
Coil

Microprocessor

Trip Unit
Switches

Trip
Indicator

Current Sensor
(one per pole)

Trip System

TWO-STEP ENERGY CLOSING
MECHANISM

Square D insulated case circuit breakers include a two-step stored energy
mechanism that provides a maximum closing time of five cycles. Two-steps refers
to the two distinct operations required to close the circuit breaker:
• Electrically or manually charging the closing springs.
• Pressing the push-to-close button to release the closing mechanism and close
the contacts.
As the mechanism closes, the opening springs are automatically charged so that
the circuit breaker may be opened by pressing the push-to-open button.

06033002

CHARGING THE CLOSING SPRINGS

The closing springs may be charged electrically or manually. The charging handle
that pivots out from the front of the circuit breaker is used to manually charge the
closing springs. The handle must be moved up and down about 25 times until it
disengages and moves freely. At this time, the closing springs indicator reads
CHARGED and the charging handle may be returned to the stored position.
Excessive force should not be necessary to operate the circuit breaker manual
charging handle. If a problem occurs contact your local Square D sales office or
Square D Field Services Division at 1-888-778-2733 (1-888-SQUARED) for
assistance.

8
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
General Information

Electrical charging of the closing springs is accomplished using a spring charging
motor. The spring charging operation, which takes appoximately seven seconds,
is initiated automatically whenever the closing springs are discharged and power
is supplied to the charging motor. When the springs are completely charged, the
motor is disconnected and CHARGED appears in the window of the closing
spring’s indicator. A manual charging handle is provided as an integral part of
electrically-operated circuit breakers for manual charging, if necessary.
CLOSING THE CIRCUIT BREAKER
CONTACTS

After the closing springs have been charged, the circuit breaker contacts may be
closed locally using the push-to-close button, or remotely using a shunt close
auxiliary device. Once the circuit breaker contacts have been closed,
DISCHARGED appears in the closing spring’s indicator window, and the contact
opening springs are automatically charged. The entire circuit breaker closing
operation may be accomplished from a remote location using the following
auxiliary components:
1. The spring charging motor charges the closing springs from a remote signal
(factory installable, field replaceable).
2. The shunt trip device opens the circuit breaker contacts from a remote signal
(factory installable, field replaceable).
3. The shunt close device closes the circuit breaker contacts from a remote
signal (factory installable, field replaceable).

FIXED MOUNT CONSTRUCTION

Fixed-mounted SE insulated case circuit breakers are intended for use in
equipment requiring stationary mounting of circuit breakers. Power connections
are bolted directly to the terminals or extensions of the circuit breaker. Control
power connections for accessories are made through terminal blocks on the side
of the circuit breaker.
The face of a fixed-mounted circuit breaker fits through an opening in the
switchboard cell door to provide access to the circuit breaker controls when the
cell door is closed. Optional interlocks prevent the circuit breaker from closing
when the cell door is open.

DRAWOUT CONSTRUCTION

Drawout construction of SE insulated case circuit breakers provides easy
installation and inspection of the circuit breaker. Power connections are made
using plug-on pressure connections. Control power wiring is done with a control
power connector (control power supply side) and terminal blocks (control power
load side) mounted on the drawout carriage. The circuit breaker can be easily
racked into and out of its cell using the drawout crank (Catalog Number SEDC).
A position indicator on the front of the circuit breaker indicates the circuit breaker’s
position within the cell. The position indicator shows one of the following
positions:
DISC—Indicates that the circuit breaker is not retained in the cell and can be
manually rolled into and out of the cell. The power connections are disengaged.
The control connections are not disengaged until the circuit breaker is physically
rolled out onto the cradle rails and prevented from rolling back into the cell by rail
wheel detents.
TEST—Indicates that the circuit breaker is retained in the cell, but the power
connectors are disengaged. The control power connectors are connected.
CONN—Indicates that all control and power connectors are engaged. The circuit
breaker is ready for service.
The face of a standard drawout SED circuit breaker fits through an opening in the
switchboard cell door and allows access to the circuit breaker controls when the
cell door is closed. Optional interlocks prevent the circuit breaker from being
drawn into the carriage when the cell door is open.
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06/01

Electronic Trip Insulated Case Circuit Breakers
General Information

PUSH-TO-OPEN AND PUSH-TO-CLOSE
BUTTONS

Bulletin No. 0603DB0102
June 2001

Each SE insulated case circuit breaker can be manually opened and closed. For
ease of operation, the push-to-open and push-to-close buttons are located on the
face of each insulated case circuit breaker. These buttons meet the requirements
of NEC Section 240-80, which requires the manual operation of circuit breakers.
When the closing springs have been charged, SE circuit breakers may be closed
using the push-to-close button. The opening springs are automatically charged
when the circuit breaker is closed. On electrically-operated circuit breakers, the
closing springs are recharged by the spring charging motor immediately after
closing.
An optional cover limits access to the push-to-close button and inhibits accidental
manual closing of the circuit breaker contacts. In an emergency, the circuit breaker
may be manually closed by inserting a small screwdriver through the hole in the
cover and depressing the push-to-close button. The push-to-open button is used to
manually open the circuit breaker. This button can be used to exercise the tripping
mechanism and test any electrical accessories, except alarm switches. The alarm
switch will only actuate when the circuit breaker has been tripped from the internal
tripping coil. The alarm switch will not indicate if the circuit breaker has been
opened manually or by the use of a shunt trip. Since all operating parts are
exercised when operated in this manner, the use of the push-to-open button verifies
that the circuit breaker mechanism is operable. Also, this button can be used to
check emergency circuit and motor sequencing operations, and to diagnose
electrical problems. It is recommended that the circuit breaker tripping mechanism
be exercised at least annually. In keeping with the intent of NEC Section 240-80, it
is not recommend to restrict access to the push-to-open button. A push-to-open
padlock attachment is available to hold the circuit breaker mechanism in the open
position.

CONTACT POSITION INDICATOR

All SE insulated case circuit breakers are equipped with a contact position
indicator. This indicator reads OPEN when the circuit breaker has been turned off
or has tripped, and CLOSED when the circuit breaker is on. If the circuit breaker
has tripped, the trip indicator (located on the face of the trip unit) identifies the type
of fault (overload, short circuit, or ground fault) that opened the circuit breaker.

INTERLOCKS

The SE insulated case circuit breaker includes interlocks to deter unsafe or
incorrect operation. The interlock features are provided to minimize the possibility
of contact with energized parts or exposure to hazardous conditions. Certain
interlocks may be bypassed on a de-energized system. Consult the SE circuit
breaker instruction manual for information on bypassing these interlocks. All SE
circuit breakers are equipped with an auxiliary cover interlock and trip unit interlock.
Depending on the mounting construction (fixed or drawout), several optional
interlocks may be used.

Instantaneous OFF Feature

Full-function circuit breakers with adjustable long-time, short-time and
instantaneous (LSI) trip units provide the unique ability to turn the instantaneous
tripping function OFF. Turning OFF the instantaneous trip function increases the
current level at which the circuit breaker will trip with no intentional delay to the level
of the short-time withstand rating. This current level is typically much higher than
any of the pickup levels provided by the adjustable instantaneous feature.
In other words, using the “instantaneous OFF” feature improves coordination by
allowing the user to take advantage of the circuit breaker withstand rating.

10
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
General Information

Testing Requirements

The UL label on a Square D insulated case circuit breaker indicates that the circuit
breaker meets the requirements of the UL 489 Standard and that the
manufacturer’s production procedure is monitored by UL Field Representatives to
ensure continuing conformance to UL performance requirements. These
requirements include the following tests:

LIMITED AVAILABLE FAULT CURRENT
TESTS

• 200% Overload Calibration—Each pole of the circuit breaker must trip within a
specified time limit when carrying 200% of its continuous current rating.
• 135% Overload Calibration—With all poles loaded equally, the circuit breaker
must trip within a specified time limit while carrying 135% of its continuous
current rating.
• Overload—The circuit breaker must make and break 600% of its continuous
current rating at rated voltage. Circuit breaker frame sizes through 1600 A must
perform 50 operations at 600%. Circuit breaker frame sizes over 1600 A through
2500 A must perform 25 operations at 600%. Circuit breaker frame sizes 3000
A and 4000 A complete three operations at 600% and 25 operations at 200%.
• Temperature Rise—While carrying 100% of rated current and mounted in an
enclosure, temperature rise on a wiring terminal must be within specified limits.
• Endurance—The circuit breaker must complete the following number of
operations:
Table 4: Endurance Testing
Frame Size (A)

Operations With Current Operations Without Current

4000

400

1100

• Calibration Retest—Both the 200% and 135% overload calibration tests are
repeated.
• Short Circuit—The circuit breaker must interrupt the current while maintaining
the integrity of the circuit breaker. Three-pole circuit breakers receive two shortcircuit tests per pole and one short-circuit test on three poles for a total of seven
short-circuit tests.
• Trip Out—The 200% thermal calibration test is repeated following the shortcircuit tests.
• Dielectric—The circuit breaker must withstand, for one minute, twice its rated
voltage plus 1000 V:
— between line and load terminals with the circuit breaker in the tripped and in
the OFF positions
— between terminals of opposite polarity with the circuit breaker closed
— between live parts and the overall enclosure with the circuit breaker both
open and closed
No conditioning of the circuit breaker can take place during or between tests and
all functional parts of the circuit breaker must be operational at the conclusion of
the sequences.

11
06/01

Electronic Trip Insulated Case Circuit Breakers
General Information

Bulletin No. 0603DB0102
June 2001

HIGH AVAILABLE FAULT CURRENT TESTS After qualifying a set of circuit breakers to the standard tests, a manufacturer can
have additional circuit breaker samples tested on higher than standard available
fault currents. The following performance requirements apply:
• 200% Overload Calibration—Each pole of the circuit breaker must trip within a
specified time limit when carrying 200% of its continuous current rating.
• Short-circuit Test—With the load side terminals connected with specified bus,
the circuit breaker is exposed to a short-circuit current for a set time interval.
After safe interruption, the circuit breaker is reset and closed on the short
circuit.
• 250% Overload Calibration—Each pole of the circuit breaker must trip within a
specified time limit when carrying 250% of its continuous current rating.
• Dielectric Withstand—The circuit breaker is subjected to twice its rated
voltage, but not less than 900 V.
— between line and load terminals with the circuit breaker in the tripped and
in the OFF positions
— between terminals of opposite polarity with the circuit breaker closed
— between live parts and the overall enclosure with the circuit breaker both
open and closed
When the sample circuit breakers pass these tests, circuit breakers of the same
construction can be marked or labeled with the higher current interrupting rating.
Maintenance and Testing

Insulated case circuit breakers require little maintenance, but an inspection and
maintenance procedure should be established from the time of installation. The
service life of electronic trip insulated case circuit breakers depends on proper
application, correct installation, suitable environmental conditions, and preventive
maintenance. The guide most frequently used as a basis for field testing
requirements is NEMA Standard AB4, Guidelines for Inspections and Preventive
Maintenance of Molded Case Circuit Breakers Used in Commercial and Industrial
Applications.
It is recommended that insulated case circuit breakers be inspected and tested
during the normal annual maintenance of electrical systems. If operating or
environmental conditions are severe, more frequent inspections are
recommended.
NOTE: Square D insulated case circuit breakers must not be disassembled.
Doing so would void the UL Listing and the Square D warranty.

INSPECTION AND PREVENTIVE
MAINTENANCE

Inspection procedures check items that may indicate a potential problem. For
information on inspection and preventive maintenance, see Square D data
bulletin Field Testing and Maintenance: MICROLOGIC® and Industrial Molded
Case Circuit Breakers.

Performance and Verification Testing

Performance tests such as insulation resistance tests, watts loss tests and
electronic tripping function trip tests can be performed to verify that the circuit
breaker is able to perform its basic functions.
Use secondary injection testing or primary injection testing to check the trip
system. A Square D Universal Test Set (Catalog Number UTS3) is available for
secondary injection testing. If additional information or assistance is needed,
contact your local Square D Field Sales Office. For on-site service, contact
Square D Field Services, 24 hours a day, at 1-888-778-2733 (1-888-SQUARED).

12
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

CATALOG NUMBERS

When ordering Square D insulated case circuit breakers, include the circuit
breaker family, description, poles, voltage rating, ampere rating and suffix. The
following figure shows the catalog number broken down by component. For
example, SEHD36800LSG, a typical catalog number, can be broken down as
follows:
Table 5: Catalog Number Broken Down by Components
SEH

Circuit breaker family

D or F

Indicates how the circuit breaker is constructed

Number of poles requested

Voltage rating specified

800

Continuous current ampere rating (handle rating) range specified

LSG

Available trip unit option

MICROLOGIC® TRIP SYSTEM
Square D electronic trip insulated case circuit breakers are equipped with the
MICROLOGIC Full-function Trip System. This trip system provides adjustable
tripping functions and characteristics using true root-mean-square (rms) current
sensing.

06033003

General

.75

RATING PLUG

4
.9

CAT NO. : ARP100
Max. Ampere Rating (P) = Sensor (S) x 100%

.95

.6
.5

1.0

% of Rating

7
PICKUP
x P

4.5

.5
10

-----

DELAY

.2
.1

.35
7

2.5
PICKUP
x P

OFF

INSTANT.

I2 t IN

.55
.65

.75
PICKUP

GROUND FAULT
.5

.32
.2
.1

.45

.3
.25

I 2 t OUT

.32

12
14

SEC. AT
6xP

100

5
4

SHORT TIME
I2 t OUT

P
H
INDICATOR
A
RESET
S
E
Press and Hold
for Ammeter Reset

3
2.5

PICKUP
x P

LONG TIME

AMMETER / TRIP INDICATOR

PHASE
SELECT

I 2 t IN

.5
.32

.32
.2

DELAY

SEC. AT
12 x P

SEC. AT
1xS

FLASH=90%
ON = OVERLOAD

micrologic

FULL-FUNCTION
SERIES B

Full-function Trip Unit

MICROLOGIC trip systems use a set of current transformers (called CTs or
sensors) to sense current, a full-function trip unit to evaluate the current, and a
tripping solenoid to trip the circuit breaker. Adjustable rotary switches on the trip
unit allow the user to set the proper overcurrent or ground current protection
required in the electrical system. If current exceeds a set value for longer than its
set time delay, the trip system opens the circuit breaker.
Circuit breakers are shipped with the long-time pickup switch set at 1.0 and all
other trip unit adjustments set at their lowest settings. Actual settings required for
a specific application must be determined by a qualified consultant or plant
engineer. A coordination study is recommended to provide coordination between
all circuit breakers in the distribution system.
The sensing system on an electronic trip insulated case circuit breaker responds
to the flow of current through the circuit breaker. Electronic trip circuit breakers are
limited to ac systems because the electronic trip system uses current
transformers to sense the current.

Current

Load Current (in amperes)

06033004

RMS Sensing

The MICROLOGIC trip system samples the current waveform 33 times per cycle
on a 60 Hz system. It then uses this data to calculate the true rms current through
the 13th harmonic.

Sample
Interval

Time

Time (in seconds)

Trip System Current Sensing

This true rms sensing gives accurate values for the magnitude of a non-sinusoidal
waveform. Therefore, the heating effects of harmonically distorted waveforms are
accurately evaluated.
Electronic trip circuit breakers with MICROLOGIC trip systems can be used on
50/60 Hz systems with alternating current (ac) to direct current (dc), dc to ac, and
ac to ac converters. This includes applications that use silicon-controlled rectifiers
(SCRs) and adjustable frequency controls.

13
06/01

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

Rating plugs are used to determine the circuit breaker ampere rating (P)
according to the following equation:

06783048

Rating Plugs

Bulletin No. 0603DB0102
June 2001

Ampere (P) = Sensor (S) x
Rating
Size

RATING PLUG

Rating
Plug %

CAT NO. : ARP100
Max. Ampere Rating (P) = Sensor (S) x 100%

Rating Plug

The ampere rating and the long-time pickup switch are then combined to
determine the circuit breaker continuous current rating. For example:
Continuous
= Sensor (S) x
Current Rating
Size
225 =

600

Rating
Plug %

Long-time
Setting

0.75

0.5

Rating plugs are available with multiplier values ranging from 0.40 to 1.00. If the
rating plug is not installed, the circuit breaker will operate safely, but the trip unit
will default to a rating plug multiplier of 0.40.
Rating plugs and ammeter/trip indicators are subject to damage from static
charge. Internal damage can result if these devices are handled by their contacts.
If either device is removed from the trip unit, it must be held against grounded
metal, such as the metal circuit breaker enclosure, for at least two seconds before
reinstalling.
Each MICROLOGIC circuit breaker is shipped with a rating plug factory installed.
The label on the circuit breaker marked “Configuration as Shipped” gives the
circuit breaker configuration as it left the factory. Field-installable rating plug kits
are also available. See the Accessory section of this bulletin for available
field-installable rating plug kits.
Ground-fault pickup values are based on the sensor size of the circuit breaker and
are not affected by changing the rating plug.

06903154

Ammeter/Trip Indicator

The ammeter/trip indicator is a troubleshooting tool used to identify the type of
fault if an overcurrent condition occurs, and to find potential overcurrent situations.

AMMETER
TRIP INDICATOR
/ TRIP INDICATOR

PHASE
SELECT

INDICATOR
INDICATOR
RESET
RESET

P
H
A
S
E

Press and Hold
for Ammeter Reset
% of Rating

Ammeter/Trip Indicator

100

The ammeter/trip indicator displays current in phases A, B and C, and the peak
ground-fault current flowing in the circuit. Each value can be viewed one at a time
using the phase select/indicator reset button. (Phase values are displayed in true
rms. Ground-fault current values are displayed in calculated rms based on
measured peak current.) A bar graph is provided indicating the level of operating
current as a percentage of the programmed ampere rating of the circuit breaker.
The ammeter/trip indicator window displays “OVERLOAD,” “SHORT CIRCUIT,” or
“GROUND FAULT” when the circuit breaker trips from an overcurrent. The
indicator must be manually reset by pushing the phase select/indicator reset
button.
The ammeter can also be used as a rough guide when setting the ground-fault
pickup when a coordination study is not available. Selecting the GF screen under
normal operating conditions will display the ground-fault leakage current under
those conditions. In order to protect against abnormal conditions, the ground-fault
pickup should be set somewhat higher than the GF value displayed on the screen.
The phase select/indicator reset button can be pressed at any time to test the
ammeter/trip indicator battery condition. The window will display a battery
symbol. If this does not occur, contact Square D for a replacement ammeter/trip
indicator. The ammeter/trip indicator is factory installed on the full-function circuit
breaker. It can be installed in or removed from the trip unit without tripping the
circuit breaker.

14
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Memory Feature

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

MICROLOGIC trip systems feature a memory circuit for intermittent overload or
ground-fault conditions. This allows the circuit breaker to respond to a series of ON
and OFF overload or ground-fault conditions which could cause conductor
overheating, but go undetected in a conventional electronic trip device.
If the circuit breaker trips due to an overcurrent condition, wait at least one minute
before resetting the circuit breaker. This allows the memory to clear itself
sufficiently for the circuit breaker to be turned ON. If checking trip times, wait fifteen
minutes after the circuit breaker trips before resetting to allow memory to reset
completely to zero (or use a memory reset module, Cat. No. MTMB).

Equipment Ground-fault Detection

Full-function circuit breakers are available with integral equipment ground-fault
detection to provide either ground-fault protection (trip) or alarm (no trip) on solidly
grounded systems. These circuit breakers utilize a residual sensing scheme for
equipment ground-fault detection.
SE type circuit breakers can be configured for source ground-sensing equipment
ground-fault protection.
Full-function circuit breakers are also available with integral equipment ground-fault
alarm (no trip) to monitor the flow of ground-fault current and signal an alarm
condition through the POWERLOGIC system, or with additional components
described in the data bulletin Ground-fault Alarm for MICROLOGIC® Electronic Trip
Circuit Breaker. This feature meets NEC Sections 700-7(d) and 700-26 for
emergency systems. Circuit breakers with the ground-fault alarm trip option DO
NOT provide ground-fault protection (do not trip).
Equipment ground-fault protection trip units include both ground-fault pickup and
delay adjustments. Ground-fault alarm (no trip) trip units include only ground-fault
pickup adjustments.
Circuit breakers with either equipment ground-fault protection or alarm (no trip) trip
systems are equipped with an internal ground-fault push-to-test feature. The
ground-fault push-to-test is built into the circuit breaker and eliminates the need for
any additional test equipment, such as monitor panels. The ground-fault push-totest requires 120 Vac control power.

Zone-selective Interlocking

Zone-selective interlocking (ZSI, also called zone restraint) is used to reduce the
stress on electrical distribution equipment during fault conditions while maintaining
coordination.
ZSI allows electronic trip devices to communicate with each other so that a short
circuit or ground fault will be isolated and cleared by the nearest upstream circuit
breaker with no intentional time delay. Devices in all other areas of the system
(including upstream) remain closed to maintain service to unaffected loads.
ZSI limits fault stress on the power distribution system by reducing the time it takes
to clear the fault, while maintaining system coodination between overcurrent
protective devices.
ZSI is a standard feature on MICROLOGIC full-function circuit breakers. In order to
have a functional ZSI system, Square D electronic trip devices require interconnect
wiring between their terminal strips using a twisted pair of #14, #16 or #18 AWG
conductors.
For more information on zone-selective interlocking, see data bulletin Reducing
Fault Stress With Zone-selective Interlocking.

15
06/01

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

Trip Characteristics

Bulletin No. 0603DB0102
June 2001

MICROLOGIC trip units provide a full range of adjustable tripping characteristics
using a programmable microcomputer that constantly monitors the line currents.
The overcurrent or ground-fault current pickup and delay levels are set using
adjustable rotary switches on the face of the trip unit. If the line current exceeds the
trip settings, the microcomputer signals the circuit breaker to trip.
Table 6: Adjustable Tripping Characteristics for
Electronic Trip Circuit Breakers
Full-function Trip Unit
Long-time pickup
Long-time delay
Short-time pickup
Short-time delay (I2 t IN and 12 t OUT)
Instantaneous pickup
Instantaneous OFF
Ground-fault pickup
Ground-fault delay (I2 t IN and 12 t OUT)
Ground-fault alarm

Trip settings are used to obtain a coordinated system in which a downstream circuit
breaker will trip before an upstream circuit breaker.
Properly adjusting the MICROLOGIC trip settings will result in a circuit breaker trip
curve that falls above and to the right of the branch circuit breaker trip curve. Under
overcurrent conditions, the branch circuit breaker will trip first.
Square D recommends that a system coordination study be done to find the proper
trip unit settings to optimize coordination with other devices.
I2t OUT delay is a “constant time” characteristic in that the delay time does not
change as the current increases.
I2t IN delay is an “inverse time” characteristic in that the delay time decreases as
the current increases.
The full-function trip unit trip curve drawing, which follows, shows the various parts
of a typical trip curve affected by the adjustments on a full-function trip unit.
Adjusting the trip unit switches will shift that area of the trip curve.
06033007

Full-function Trip Unit Functions

Long-time
Pickup

1000

Long-time
Delay

Full-function Trip
Unit Trip Curve

100

Short-time
Pickup

Short-time
Delay (I²t IN)
1.0

0.1

Short-time
Delay (I²t OUT)

Instantaneous Pickup

0.01
1

5
10
100
Multiples of Ampere Rating*

*Ampere Rating (P) = Sensor Size (S) x Rating Plug (%)

16
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

LONG-TIME PICKUP Switch—Switch
value (multiplied by the ampere rating) sets
the maximum current level which the circuit
breaker will carry continuously. If the
current exceeds this value for longer than
the long-time delay time, the circuit breaker
will trip.

06033008

LONG-TIME TRIP FUNCTION

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

.75 .8
.7
.6

1.0

.95
PICKUP
xP

LONG TIME
7

4.5

16
20

3
2

DELAY

SEC. AT
6xP
FLASH = 90%
ON = OVERLOAD

06033009

LONG-TIME DELAY Switch—Sets length of
time that the circuit breaker will carry a
sustained overload before tripping. Delay
bands are labeled in seconds of overcurrent
at six times the ampere rating. For maximum
coordination, there are eight delay bands.

.75 .8
.9

.95

.6
.5

PICKUP
xP

1.0

LONG TIME
7

4.5

16
20

Long-time delay is an “inverse time”
characteristic in that the delay time
decreases as the current increases.

DELAY

SEC. AT
6xP
FLASH = 90%
ON = OVERLOAD

Indicator

Indicator—the trip unit includes an indicator
that will flash when the current reaches 90% of the LONG-TIME PICKUP setting
and will be lit continuously when the current is above 100% of the pickup setting.
SHORT-TIME PICKUP Switch—Switch
value (multiplied by the ampere rating) sets
the short-circuit current level at which the
circuit breaker will trip after the set SHORTTIME DELAY.

06033010

SHORT-TIME TRIP FUNCTION

2.5
2

8
PICKUP
xP

SHORT TIME

SHORT-TIME DELAY Switch—Sets length
of time the circuit breaker will carry a short
circuit within the short-time pickup range.
The delay (based on 12 times the ampere
rating, P) can be adjusted to four positions
of I2t ramp operation (I2t IN) or four positions
of fixed time delays (I2t OUT).

I2t OUT I2t IN
.5 .5
.32
.32
.2

.1
DELAY
SEC. AT
12 x P

06033011

I2t IN delay is an "inverse time" characteristic in that the delay time decreases as
the current increases.
4

2.5
2

8
10

PICKUP
xP

SHORT TIME
I2t OUT I2t IN
.5 .5
.32

.32

I2t In

DELAY
SEC. AT
12 x P

I2t Out

17
06/01

Electronic Trip Insulated Case Circuit Breakers
MICROLOGIC® Trip System

INSTANTANEOUS PICKUP Switch—switch
value (multiplied by the ampere rating) sets
the short-circuit current level at which the
circuit breaker will trip with no intentional
time delay.

06033012

I2t OUT INSTANTANEOUSTRIP FUNCTION

Bulletin No. 0603DB0102
June 2001

10
12

4
3

OFF

PICKUP
xP

Instantaneous

The instantaneous function will override the
short-time function if the INSTANTANEOUS
PICKUP is adjusted at the same or lower
setting than the SHORT-TIME PICKUP.
060133013

In full-function trip units with both adjustable
short-time and instantaneous trip functions,
the adjustable instantaneous trip can be
disabled by setting INSTANTANEOUS
PICKUP to OFF.

12
3
PICKUP
xP

OFF

Instantaneous

Even when the instantaneous pickup is
turned OFF, an instantaneous override
occurs at the circuit breaker short-time
withstand rating.
GROUND-FAULT PICKUP Switch—
switch value (multiplied by the sensor
size) sets the current level at which the
circuit breaker will trip after the set
GROUND-FAULT DELAY.

06033014

EQUIPMENT GROUND-FAULT TRIP
FUNCTION

.35 .45
3

.55
.65

2.5
2

PICKUP
xS

.75

Ground Fault
I2t OUT I2t IN
.5 .5
.32

Ground-fault pickup values are based on
circuit breaker sensor size only, not on the
rating plug multiplier. Changing the rating
plug multiplier has no effect on groundfault pickup values.

.32

.1
DELAY
SEC. AT
1xS

06033015

GROUND-FAULT DELAY
.35 .45
3
.55
Switch—sets length of time
.65
2.5
the circuit breaker will carry
.75
2
ground-fault current which
Ground Fault
I t OUT I t IN
exceeds the GROUND.5 .5
.32
.32
FAULT PICKUP level
.2
.2
.1
.1
before tripping. Delay can
DELAY
be adjusted to four
positions of I2t ramp
operation (I2t IN) or four
positions of fixed time delays (I2t OUT).
PICKUP
xS

I2t In

I2t Out

I2t OUT GROUND-FAULT ALARM
FUNCTION

GROUND-FAULT ALARM Switch—switch
value (multiplied by the sensor size) sets
the current level at which the circuit
breaker will signal the POWERLOGIC
system that a ground fault is present.

06033016

SEC. AT
1xS

.35 .45
3

.55
.65

2.5
2

.75
PICKUP
xS

Ground Fault
Alarm

18
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Circuit Breaker Specifics

CIRCUIT BREAKER SPECIFICS

This part describes the SE type insulated case circuit breakers available from
Square D.

Description

SE/SEH – 400 A sensor, 800 A sensor, 1200 A sensor, 1600 A sensor, 2000 A
sensor, 2500 A sensor, 3000 A sensor and 4000 A sensor SE – 600 Vac, 50/60
Hz, 3-pole electronic trip circuit breaker with the full-function MICROLOGIC trip
system, includes a true two-step, stored energy closing mechanism, with a
maximum 5-cycle closing time. Available in fixed or drawout construction.
SEH – 600 Vac, 50/60 Hz, 3-pole, high interrupting electronic trip circuit breaker
with the full-function MICROLOGIC trip system. Includes a true two-step, stored
energy closing mechanism, with a maximum 5-cycle closing time. Available in
fixed or drawout construction.

Applications

SE/SEH circuit breakers are UL Listed to be applied at 100% of their continuous
current rating when applied in an intended enclosure.
SE/SEH circuit breakers may be mounted and operated in any position, and are
not limited to vertical or horizontal mounting.
Table 7: 600 Vac Short-time Withstand Rating
Sensor (Frame) Size
SE

50 kA

SEH

65 kA

Table 8: Neutral Current Transformers

UL Listed Interrupting Ratings
(In RMS Symmetrical Amperes)

Catalog Number

Sensor

Where Used

SE04NCT

400

SE, SEH

SE12NCT

800, 1200

SE, SEH

SE30NCT

1600
2000
2500
3000

SE, SEH

SE40NCT

4000

SE, SEH

Table 9: Field-installable Rating Plug Kits
Catalog Number

Multiplier

ARP040

0.400

ARP050

0.500

ARP056
ARP058
ARP060
ARP063

0.563
0.583
0.600
0.625

ARP067
ARP070
ARP075
ARP080

0.667
0.700
0.750
0.800

ARP083
ARP088
ARP090
ARP100

0.833
0.875
0.900
1.000

The following pages provide selection data, dimensions and tripping
curves relating to 4000 A frame Square D electronic trip insulated case
circuit breakers.

19
06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Sensors/Ampere Ratings

Table 11: Selection Data for 4000 A Frame SE Circuit Breakers
Drawout (Standard Interrupting Rating)

Drawout (High Interrupting Rating)

Catalog Number

Sensor
Rating

Ampere
Rating

Long-time
Instantaneous

Long-time
Short-time
Instantaneous

Long-time
Instantaneous
w/Ground-fault
Protection

Long-time
Short-time,
Instantaneous
w/Ground-fault
Protection*

Long-time
Instantaneous

Long-time
Short-time
Instantaneous

Long-time
Instantaneous
w/Ground-fault
Protection*

Long-time
Short-time,
Instantaneous
w/Ground-fault
Protection

Rating
Plug
Installed

400 A

200
250
300
350
400

SED36200LI
SED36250LI
SED36300LI
SED36350LI
SED36400LI

SED36200LS
SED36250LS
SED36300LS
SED36350LS
SED36400LS

SED36200LIG
SED36250LIG
SED36300LIG
SED36350LIG
SED36400LIG

SED36200LSGS
ED36250LSG
SED36300LSG
SED36350LSG
SED36400LSG

SEHD36200LI
SEHD36250LI
SEHD36300LI
SEHD36350LI
SEHD36400LI

SEHD36200LS
SEHD36250LS
SEHD36300LS
SEHD36350LS
SEHD36400LS

SEHD36200LIG
SEHD36250LIG
SEHD36300LIG
SEHD36350LIG
SEHD36400LIG

SEHD36200LSG
SEHD36250LSG
SEHD36300LSG
SEHD36350LSG
SEHD36400LSG

ARP050
ARP063
ARP075
ARP088
ARP100

800 A

600
800

SED36600LI
SED36800LI

SED36600LS
SED36800LS

SED36600LIG
SED36800LIG

SED36600LSG
SED36800LSG

SEHD36600LI
SEHD36800LI

SEHD36600LS
SEHD36800LS

SEHD36600LIG
SEHD36800LIG

SEHD36600LSG
SEHD36800LSG

ARP075
ARP100

1200 A

1000
1200

SED361000LI
SED361200LI

SED361000LS
SED361200LS

SED361000LIG
SED361200LIG

SED361000LSG
SED361200LSG

SEHD361000LI
SEHD361200LI

SEHD361000LS
SEHD361200LS

SEHD361000LIG
SEHD361200LIG

SEHD361000LSG
SEHD361200LSG

ARP083
ARP100

1600 A

1400
1600

SED361400LI
SED361600LI

SED361400LS
SED361600LS

SED361400LIG
SED361600LIG

SED361400LSG
SED361600LSG

SEHD361400LI
SEHD361600LI

SEHD361400LS
SEHD361600LS

SEHD361400LIG
SEHD361600LIG

SEHD361400LSG
SEHD361600LSG

ARP090
ARP100

2000 A

1800
2000

SED361800LI
SED362000LI

SED361800LS
SED362000LS

SED361800LIG
SED362000LIG

SED361800LSG
SED362000LSG

SEHD361800LI
SEHD362000LI

SEHD361800LS
SEHD362000LS

SEHD361800LIG
SEHD362000LIG

SEHD361800LSG
SEHD362000LSG

ARP090
ARP100

2500 A

2500

SED362500LI

SED362500LS

SED362500LIG

SED362500LSG

SEHD362500LI

SEHD362500LS

SEHD362500LIG

SEHD362500LSG

ARP100

3000 A

3000

SED363000LI

SED363000LS

SED363000LIG

SED363000LSG

SEHD363000LI

SEHD363000LS

SEHD363000LIG

SEHD363000LSG

ARP100

4000 A

3200
4000

SED363200LI
SED364000LI

SED363200LS
SED364000LS

SED363200LIG
SED364000LIG

SED363200LSG
SED364000LSG

SEHD363200LI
SEHD364000LI

SEHD363200LS
SEHD364000LS

SEHD363200LIG
SEHD364000LIG

SEHD363200LSG
SEHD364000LSG

ARP080
ARP100

Fixed Mount (Standard Interrupting Rating)

Fixed Mount (High Interrupting Rating)

Catalog Number

Sensor
Rating

Ampere
Rating

Long-time
Instantaneous

Long-time
Short-time
Instantaneous

Long-time
Instantaneous
w/Ground-fault
Protection

Long-time
Short-time,
Instantaneous
w/Ground-fault
Protection*

Long-time
Instantaneous

Long-time
Short-time
Instantaneous

Long-time
Instantaneous
w/Ground-fault
Protection

Long-time
Short-time,
Instantaneous
w/Ground-fault
Protection*

Rating
Plug
Installed

400 A

200
250
300
350
400

SEF36200LI
SEF36250LI
SEF36300LI
SEF36350LI
SEF36400LI

SEF36200LS
SEF36250LS
SEF36300LS
SEF36350LS
SEF36400LS

SEF36200LIG
SEF36250LIG
SEF36300LIG
SEF36350LIG
SEF36400LIG

SEF36200LSGS
EF36250LSG
SEF36300LSG
SEF36350LSG
SEF36400LSG

SEHF36200LI
SEHF36250LI
SEHF36300LI
SEHF36350LI
SEHF36400LI

SEHF36200LS
SEHF36250LS
SEHF36300LS
SEHF36350LS
SEHF36400LS

SEHF36200LIG
SEHF36250LIG
SEHF36300LIG
SEHF36350LIG
SEHF36400LIG

SEHF36200LSG
SEHF36250LSG
SEHF36300LSG
SEHF36350LSG
SEHF36400LSG

ARP050
ARP063
ARP075
ARP088
ARP100

800 A

600
800

SEF36600LI
SEF36800LI

SEF36600LS
SEF36800LS

SEF36600LIG
SEF36800LIG

SEF36600LSG
SEF36800LSG

SEHF36600LI
SEHF36800LI

SEHF36600LS
SEHF36800LS

SEHF36600LIG
SEHF36800LIG

SEHF36600LSG
SEHF36800LSG

ARP075
ARP100

1200 A

1000
1200

SEF361000LI
SEF361200LI

SEF361000LS
SEF361200LS

SEF361000LIG
SEF361200LIG

SEF361000LSG
SEF361200LSG

SEHF361000LI
SEHF361200LI

SEHF361000LS
SEHF361200LS

SEHF361000LIG
SEHF361200LIG

SEHF361000LSG
SEHF361200LSG

ARP083
ARP100

1600 A

1400
1600

SEF361400LI
SEF361600LI

SEF361400LS
SEF361600LS

SEF361400LIG
SEF361600LIG

SEF361400LSG
SEF361600LSG

SEHF361400LI
SEHF361600LI

SEHF361400LS
SEHF361600LS

SEHF361400LIG
SEHF361600LIG

SEHF361400LSG
SEHF361600LSG

ARP090
ARP100

2000 A

1800
2000

SEF361800LI
SEF362000LI

SEF361800LS
SEF362000LS

SEF361800LIG
SEF362000LIG

SEF361800LSG
SEF362000LSG

SEHF361800LI
SEHF362000LI

SEHF361800LS
SEHF362000LS

SEHF361800LIG
SEHF362000LIG

SEHF361800LSG
SEHF362000LSG

ARP090
ARP100

2500 A

2500

SEF362500LI

SEF362500LS

SEF362500LIG

SEF362500LSG

SEHF362500LI

SEHF362500LS

SEHF362500LIG

SEHF362500LSG

ARP100

3000 A

3000

SEF363000LI

SEF363000LS

SEF363000LIG

SEF363000LSG

SEHF363000LI

SEHF363000LS

SEHF363000LIG

SEHF363000LSG

ARP100

4000 A

3200
4000

SEF363200LI
SEF364000LI

SEF363200LS
SEF364000LS

SEF363200LIG
SEF364000LIG

SEF363200LSG
SEF364000LSG

SEHF363200LI
SEHF364000LI

SEHF363200LS
SEHF364000LS

SEHF363200LIG
SEHF364000LIG

SEHF363200LSG
SEHF364000LSG

ARP080
ARP100

*Substitute (A) in place of (G) for ground-fault alarm (pick-up indication only).

20
06/01

Electronic Trip Insulated Case Circuit Breakers
Dimensions

Bulletin No. 0603DB0102
June 2001

SEF Circuit Breaker Mounted Dimensions

06033017

Sensor Sizes 400 A through 1200 A (SEF, SEHF)
0.50
[13]

0.75
[19]

100
[25]

6.10
[155]

1.12
[28]
63 Dia.
[16]
1.75
[44]

2.80
[71]

1.12
[28]
4.00
[102]

3.00
[75]

4.10
[104]

in.
Dimensions: [mm]

1.28
[33]

Sensor Sizes 1600 A through 4000 A (SEF, SEHF)
06133018

1.00
[25]

Power Connector and CT Dimensions
Dim. A

Dim. B

Dim. C

Dim. D

Dim. E

Dim. F

in.

Dim. G
mm

1600 A
through
3000 A

6.10

155

1.12

1.75

1.12

4.10

104

3.00
(Max.)

4000 A

8.10

206

1.50

2.00

1.60

1.20

5.35

136

3.50

Sensor

5.00
[127]
7.72
[196]

13.74
[349]

5.00
[127]
9.30
[236]
15.44
[392]
8.52
[216]

5.35
[136]

4.25
[108]
3.44
[87]

0.56 Dia.
[14]

11.95
[304]
A
B

0.38
[10]

0.63 Dia.
[16]

15.30
[389]

14.09
[358]
13.34
[339]
2.08
[53]

1.33
[34]

12.95
[329]

D
12.25
[311]

11.70
[297]

2.80
[71]

15.95
[405]

18.78
[477]

21.02
[534]

Push-to-open

E
4.00
[102]

12.20
[310]

1.28
[33]

Push-to-close

Dimensions:

21
© 1992–2001 Schneider Electric All Rights Reserved

06/01

in.
[mm]

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Dimensions

SED/SEHD Circuit Breaker Drawout Dimensions
06033019

A
8.43
5.00 [214]
[127]
1.00
[25]

5.00
[127]

SED/SEHD Dimensions
Dim. A

Dim. D

Dim. E

Dim. F

in.

Dim. B
mm

in.

Dim. C
mm

in.

SED 400 A
18.44
through 1200 A

468

17.32

440

0.98

2.75

3.00

12.96

329

SED 3000 A

18.44

468

17.32

440

0.98

4.00

102

3.00

12.96

329

SED 4000 A

18.84

479

18.32

465

0.98

4.00

102

3.50

13.96

355

Frame
in.

17.14
[435]
8.18
[208] 4.23
[107]

9.30
18.24 [236]
[463]
8.52
13.74 [216]
[349]
Gas Shield

0.75 Dia.
[19]
0.50 Dia.
[13]

15.30
[389]

0.38
[10]

4.25
[108]
3.44
[87]

12.95
[329]
11.95
[304]

0.55 Con. Engagement
[14]

C
11.70
[297]
0.43
[11]

0.50 Dia.
[13]
2.00 Dia.
[51]

6.05
[154]

12.25
[311]
15.95
[405]
8.62
[219]

0.75 Drawout
[19] Hexdrive

5.35
[136]

15.44
[392]

17.56
18.44 [446]
[468]

40°

13.38
[340]
D

4.85
[123]

1.50 Dia.
[38]
1.10
[28]
Push-to-open

E
1.29
[33]

15.60
[397]

5.00 (Max.)
[102]

7.84
[199]

6.80
[173]

5.00 (Max.)
[102]

1.28
[33]

F
Dimensions:

Push-to-close

in.
[mm]

06033020

Neutral Current Transformers

4.12
[105]

1.40
[36]
4.95
[126]

6.58
[167]

4.12 7.58
[105] [193]

3.00
[76]

3000 Ampere and Smaller

1.06
[27]
4.95
[126]

3.50
[89]

4000 Ampere

Dimensions:

in.
[mm]

22
06/01

Electronic Trip Insulated Case Circuit Breakers
Tripping Curves

Bulletin No. 0603DB0102
June 2001

Trip Curves
SE ELECTRONIC TRIP INSULATED CASE CIRCUIT BREAKERS
LS (LSI) CHARACTERISTIC TRIP CURVE NO. 678-10
60
70
80
90
100

400

4000
3000

800

.8
2000
1500

1000
900
800
700
600

1200

LONG TIME
DELAY BANDS
SECONDS AT 6P
2
3

4.5

300

200
150

4000
200
150

*This setting
not provided
on 4000A sensor

100
90
80
70
60

4.5

2500
3000

300

7
11
16
24*
36*

2000

400

NOTE: Ampere rating (P) = Sensor (S) x rating plug multiplier (%).
The EZ-AMP overlay feature at the bottom of the page should be used during
coordination studies.
40000

20000

400

1600

500

30000

500

600000
700000
800000
900000
1000000

1500

Multiplier
(%)
75
88
100
56
63
75
88
100
50
58
67
75
83
100
88
100
90
100
100
100
80
100

500000

400000

2000

Suitable Rating Plug
Catalog No.
RP075
RP088
RP100
RP056
RP063
RP075
RP088
RP100
RP050
RP058
RP067
RP075
RP083
RP100
RP088
RP100
RP090
RP100
RP100
RP100
RP080
RP100

300000

.75

Ampere Rating
(P)
300
350
400
450
500
600
700
800
800
700
800
900
1000
1200
1400
1600
1800
2000
2500
3000
3200
4000

200000

6
7
8
9
10

LONG-TIME PICKUP
XP
PICKUP POINT IS 1.075
(+/-7.5%) TIMES THE SETTING

4000

Sensor
(S)

5000

150000

5000

3000

1.5

8000
7000
6000

.95*

60000
70000
80000
90000
100000

MICROLOGIC¨ trip unit with adjustable long time pickup and delay; short time
10000 pickup and delay; instantaneous pickup.
9000
CIRCUIT BREAKER INFORMATION

50000

10000
9000
8000
7000
6000

.6
.7
.8
.9
1

MULTIPLES OF AMPERE RATING (P)

100
90
80
70
60

2.5

4
20

10
9
8
7
6
5
4

5 6

SHORT TIME
PICKUP
XP

SHORT
TIME
DELAY
BANDS
2
1 t IN

10
9
8
7
6

SHORT TIME DELAY
OVERRIDE

5
4
3

1
.9
.8
.7
.6
.5
.4
.3

SHORT TIME DELAY
SECONDS AT 12P

1.5

4000 A
SENSOR

.10
.20
.32
.50

SHORT
TIME
DELAY
BANDS
2
1 t OUT
(FIXED
DELAY)

1.5

1
.9
.8
.7
.6

.32

.1
.09
.08
.07
.06

800-3000 A
SENSORS

MAXIMUM
UNRESTRAINED
SHORT TIME
DELAY

.15

5 6

.1
.09
.08
.07
.06

400 A
SENSOR

INSTANTANEOUS
PICKUP XP

.04

.05

10 12

.04

.03

.02

3000 A 2000 A 1200 A
4000 A 2500 A 1600 A
800 A

400 A

.015

.01
.009
.008
.007
.006
.005

600000
700000
800000
900000
1000000

500000

2 CYCLE

400000

300000

200000

150000

60000
70000
80000
90000
100000

40000

50000

30000

20000

60
70
80
90
100

6
7
8

.005

1 CYCLE

1 2 CYCLE

1.5

.01
.009
.008
.007
.006

1 CYCLE

.6
.7
.8
.9
1

.015

TIME IN SECONDS

AMPERES

MULTIPLES OF AMPERE RATING (P)

Tripping curves for coordination studies
are available upon request.

23
© 1992–2001 Schneider Electric All Rights Reserved

06/01

Electronic Trip Insulated Case Circuit Breakers
Tripping Curves

SE ELECTRONIC TRIP INSULATED CASE CIRCUIT BREAKERS
LI CHARACTERISTIC TRIP CURVE NO. 678-11

60
70
80
90
100

6
7
8
9
10

1.5

.95*

5000

LONG TIME PICKUP
XP
PICKUP POINT IS 1.075
(+/-7.5%) TIMES THE SETTING

4000
3000

2000

1500

1000
900
800
700
600

LONG TIME
DELAY BANDS
SECONDS AT 6P

150

100
90
80
70
60

300

200
150

NOTE: Ampere rating (P) = Sensor (S) x rating plug multiplier (%).
The EZ-AMP overlay feature at the bottom of the page should be used during
coordination studies.

6000
7000
8000
9000
10000

24
24

11
11

200

400

5000

300

500

2
3
4.5
7
11
16
24*
36*
*This setting
not provided
on 4000A sensor

16
16

4000

150

400

3000

36
36

500

2000

1500

.75

3000

600
700
800
900
1000

4000

500

5000

400

MICROLOGIC¨ trip unit with adjustable long time pickup and delay;
pickup.
CIRCUIT BREAKER INFORMATION
Ampere Rating
Suitable Rating Plug
Multiplier
(P)
Catalog No.
(%)
300
RP075
75
400
350
RP088
88
400
RP100
100
450
RP056
56
500
RP063
63
800
600
RP075
75
700
RP088
88
800
RP100
100
800
RP050
50
700
RP058
58
800
RP067
67
1200
900
RP075
75
1000
RP083
83
1200
RP100
100
1400
RP088
88
1600
1600
RP100
100
1800
RP090
90
2000
2000
RP100
100
2500
2500
RP100
100
3000
3000
RP100
100
3200
RP080
80
4000
4000
RP100
100

10000instantaneous
9000
8000
7000
Sensor
6000
(S)

300

10000
9000
8000
7000
6000

.6
.7
.8
.9
1

MULTIPLES OF AMPERE RATING (P)

200

06033022

Bulletin No. 0603DB0102
June 2001

100
90
80
70
60

4.5

10
9
8
7
6

1.5

1
.9
.8
.7
.6

INSTANTANEOUS
PICKUP XP

.15

.1
.09
.08
.07
.06

5 6

10 12
10
12

.15

.1
.09
.08
.07
.06

.05

.04

.03

.02

6000
7000
8000
9000
10000

5000

3000

2000

1500

600
700
800
900
1000

500

400

300

200

150

60
70
80
90
100

6
7
8

3000A 2000A 1200A
4000A 2500A 1600A
800A

4000

1 2 CYCLE

2 CYCLE

.005

1.5

.01
.009
.008
.007
.006

1 CYCLE

.6
.7
.8
.9
1

.015

TIME IN SECONDS

2
30

.015

.01
.009
.008
.007
.006
.005

400A

MULTIPLES OF AMPERE RATING (P)

Tripping curves for coordination studies
are available upon request.

24
06/01

06033023

Electronic Trip Insulated Case Circuit Breakers
Tripping Curves

Bulletin No. 0603DB0102
June 2001

6
7
8
9
10

SE ELECTRONIC TRIP
INSULATED CASE CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 678-12

10000
9000
8000
7000
6000

5000

4000

3000

Circuit Breaker PreÞx

2000

SE (G)

1500

1000
900
800
700
600

500

400

300

200

150

MICROLOGIC¨ tr ip unit with adjustable ground fault pickup and delay.
CIRCUIT BREAKER INFORMATION

.25

.35 .45

1200

600
700
800
900
1000

500

400

300

200

60
70
80
90
100

100
90
80
70
60

.65

GROUND FAULT
PICKUP
XS

.55

.75

20
15

10
9
8
7
6

GROUND
FAULT
DELAY
BANDS
12t IN

4
3

1.5

1
.9
.8
.7
.6

.32

1
.9
.8
.7
.6

.15

.10
.20
.32
.50

1.5

DELAY
SECONDS AT 1XS

GROUND
FAULT
DELAY
BANDS
12t OUT
(FIXED
DELAY)

.32

MAXIMUM UNRESTRAINED
GROUND FAULT DELAY

.2
.15

.1
.09
.08
.07
.06

.05

.04

.03

.02

600
700
800
900
1000

500

300

150

200

60
70
80
90
100

6
7
8
9
10

1.5

.6
.7
.8
.9
1

400

1 2 CYCLE

.05

.005

1 CYCLE

1 2 CYCLE

.15

.01
.009
.008
.007
.006

1 CYCLE

.06
.07
.08
.09
.1

.015

TIME IN SECONDS

400
800
1600

15
100
90
80
70
60

Sensor (S)

150

1.5

.6
.7
.8
.9
1

.15

.06
.07
.08
.09
.1

.05

MULTIPLES OF SENSOR RATING (S)

.015

.01
.009
.008
.007
.006
.005

MULTIPLES OF SENSOR RATING (S)

Tripping curves for coordination studies
are available upon request.

06/01

Electronic Trip Insulated Case Circuit Breakers
Tripping Curves

6
7
8
9
10

10000
9000
8000
7000
6000

1.5

.6
.7
.8
.9
1

.15

.06
.07
.08
.09
.1

.05

AMPERES X 10

SE ELECTRONIC TRIP
INSULATED CASE CIRCUIT BREAKERS
CHARACTERISTIC TRIP CURVE NO. 678-13

10000
9000
8000
7000
6000

MICROLOGIC¨ trip unit with adjustable ground fault pickup and delay.

5000

4000

3000

Circuit Breaker PreÞx

Sensor (S)

2000

SE (G)

2000
2500
3000
4000

1500

1000
900
800
700
600

500

400

300

200

150

100
90
80
70
60

720

600
700
800
900
1000

500

400

300

200

150

60
70
80
90
100

CIRCUIT BREAKER INFORMATION

06033024

Bulletin No. 0603DB0102
June 2001

100
90
80
70
60

1120

800

640

GROUND FAULT
PICKUP
AMP

880 1200

10
9
8
7
6

20
15

10
9
8
7
6

1040

960

DELAY
SECONDS AT 2000A

GROUND
FAULT
DELAY
BANDS
12t IN

1.5

1
.9
.8
.7
.6

.10
.20
.32
.50

2
1.5

.5
1
.9
.8
.7
.6

.32
.2

.4
.3

.32
.1

MAXIMUM UNRESTRAINED
GROUND FAULT DELAY

.15

GROUND
FAULT
DELAY
BANDS
12t OUT
(FIXED
DELAY)

.1
.09
.08
.07
.06
.05

.2
.15

.1
.09
.08
.07
.06

.05

.04

.03

.02

600
700
800
900
1000

500

300

150

200

60
70
80
90
100

6
7
8
9
10

1.5

.6
.7
.8
.9
1

AMPERES X 10

400

1 2 CYCLE

2 CYCLE

.05

.005

.15

.01
.009
.008
.007
.006

1 CYCLE

.06
.07
.08
.09
.1

.015

TIME IN SECONDS

.015

.01
.009
.008
.007
.006
.005

Tripping curves for coordination studies
are available upon request.

26
06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Accessories

ACCESSORIES

The following describes the UL Listed accessories available for Square D
electronic trip (MICROLOGIC® ) insulated case circuit breakers. These
accessories increase application versatility and meet the demands of modern
electrical distribution systems.

Electric Joint Compound

SED/SEHD circuit breakers are supplied with joint compound on the drawout
power connectors. The compound contributes to the overall performance of the
connection.
If removed, the joint compound should be reapplied. A 2-ounce container of
compound (Catalog Number PJC-8311) is available.

Electronic Accessories

Many accessories are available that are specific to electronic trip circuit breakers.
These devices include rating plugs, trip unit seals, neutral current transformers,
electronic trip indicators, electronic circuit breaker test equipment.

RATING PLUGS

Rating plugs are used on full-function electronic trip circuit breakers to establish the
circuit breaker maximum continuous current rating. The rating plug varies the
circuit breaker continuous current rating as a function of the circuit breaker sensor
size. Rating plugs are factory installed in full-function circuit breakers and are also
available in field-installable kits.
Table 12: Interchangeable Rating Plug Kits

TRIP UNIT SEALS

Catalog Number

Multiplier

ARP040

0.400

ARP050

0.500

ARP056

0.563

ARP058

0.583

ARP060

0.600

ARP063

0.625

ARP067

0.667

ARP070

0.700

ARP075

0.750

ARP080

0.800

ARP083

0.833

ARP088

0.875

ARP090

0.900

ARP100

1.000

Trip unit seals are available for electronic trip insulated case circuit breakers and
limit access to the tripping characteristics adjustment switches.
Trip unit seals (Catalog Number TUSEAL) are provided in quantities of 100 per box.

NEUTRAL CURRENT TRANSFORMERS

Current transformers are available for applications requiring ground-fault protection
on three-phase, four-wire systems. Neutral current transformers are not required
on non-ground fault circuit breakers, or on three-phase, three-wire systems.
Table 13: Field-installable Neutral Current Transformers Selection Data
Catalog Number

Sensor

Where Used

SE04NCT

400

SE, SEH

SE12NCT

800, 1200

SE, SEH

SE30NCT

1600, 2000, 2500, 3000

SE, SEH

SE40NCT

4000

SE, SEH

27
06/01

Electronic Trip Insulated Case Circuit Breakers
Accessories

06909013

LOCAL AMMETER/TRIP INDICATOR

Bulletin No. 0603DB9201
June 2001

The local ammeter/trip indicator is a standard feature on SE insulated case circuit
breakers and is field replaceable. This device functions as a 2% accurate
ammeter under normal conditions (when the current level reaches 20% of the
circuit breaker ampere rating) and as a trip indicator after the circuit breaker trips.
The ammeter does not display at the same time as the trip indicator. The LCD trip
indicator continues to display until the trip indicator is reset. No external power
source is needed for this device.
The ammeter displays rms current in phases A, B and C, and the inherent system
ground-fault leakage current. Each of these values can be viewed one at a time
using the Phase Select/Indicator Reset button. A bar graph is provided indicating
the level of the operating current as a function of the circuit breaker’s ampere
rating.

Ammeter/Trip Indicator

The ammeter/trip indicator is a separate module that plugs into a port on the trip
unit face. This device can be removed without tripping the circuit breaker or
exposing energized parts.
The local ammeters can be ordered using Catalog Number ALAM.

06900101

RESTRAINT INTERFACE MODULE

The restraint interface module, Catalog Number RIM32, is required for zoneselective interlocking when
• the distance between any two circuit breakers in the restraint system exceeds
1000 ft (305 mm) and/or
• trip units of the circuit breakers and/or ground-fault modules to be interlocked
are not the same series.

RIM Module

06909010

UNIVERSAL TEST SET

The Universal Test Set, Catalog Number UTS3, is available to test Square D
circuit breakers with MICROLOGIC® trip units. It runs trip unit tests automatically
or manually with prompts to the user for initial information. Testing can be done
with the circuit breaker installed in the switchboard, following the directions
shipped with the test set.
A test module stores data necessary for automatic tests for each frame,
MICROLOGIC Series 3B trip units require test module CBTMB, which is included
with the Universal Test Set. If an older Universal Test Set is used that does not
contain a CBTMB test module, a CBTMB test module must be obtained.

Universal Test Set

06/01

Bulletin No. 0603DB0102
June 2001

06783072

COMMUNICATIONS ADAPTER

SE Field-replaceable Accessory Kits

Electronic Trip Insulated Case Circuit Breakers
Accessories

The field-installable communications adapter, Catalog Number CIM3F, allows a
full-function circuit breaker trip unit to communicate with a Square D
POWERLOGIC Communications Network. This allows full-function circuit breakers
to be networked in a POWERLOGIC system. The communications adapter cannot
be used with standard function circuit breakers.

SE insulated case circuit breakers with integral ground-fault protection or existing
electrical accessories are configured to accept field replaceable accessories. The
spring charging motor and shunt close device are factory installed on the circuit
breaker, and cannot be added in the field.
NOTE: SE circuit breakers not meeting this criteria will not accept any fieldinstalled electrical accessories. Contact the local Square D Sales Office for more
information on field accessibility and replacement.

SPRING CHARGING MOTOR

A spring charging motor charges the closing springs of the stored energy
mechanism. A manual charging handle is provided should manual charging be
necessary. The spring charging operation, which takes approximately seven
seconds, is initiated automatically when the closing springs are discharged and
power is supplied to the spring charging motor. When the springs are completely
charged, the motor is disconnected and CHARGED appears in the window of the
closing springs indicator.
When the closing springs have been charged, they can only be discharged by
closing the circuit breaker contacts with the push-to-close button or a shunt
(remote) close device. The closing springs cannot be discharged without closing
the circuit breaker contacts.
The spring charging motor is factory installed on the circuit breaker, and cannot be
added in the field.
NOTE: The spring charging motor is field replaceable by qualified personnel only.

29
06/01

Electronic Trip Insulated Case Circuit Breakers
Accessories

Factory-installed Device Combinations

Bulletin No. 0603DB9201
June 2001

The factory-installed device combinations are shown in the following tables.
Table 14: Spring Charging Field-replaceable Accessory Kits
Catalog
Number
Suffix

Accessory Kit
Number

Motor Rating
Voltage

Amperage (A)

ES1, EV1

S3MOT120AC2

120 Vac

1.00

ES2

S3MOT024DC2

24 Vdc

2.75

ES3

S3MOT048DC2

48 Vdc

2.75

ES4

S3MOT125DC2

125 Vdc

2.75

Table 15: Factory-installed Suffixes For Electrical Operation
Devices

Control Voltages
120 Vac

24 Vdc

48 Vdc

125 Vdc

Shunt Trip

Spring Charging Motor and Shunt
Close with Shunt Trip

ES1

ES2

ES3

ES4

Undervoltage Release

...

Spring Charging Motor and Shunt
Close with Undervoltage Trip

EV1

...

Table 16: Factory-installed Suffixes for Accessory Combinations:
Undervoltage Trip (120 Vac Only) Spring Charging Motor, Shunt
Close and Shunt Trip
Spring Charging Motor and
Shunt Close Control Voltage

Shunt Trip Control Voltage

120 Vac

ET1

ES8★✚

...

ES5★

ES6★

ES7★

24 Vdc

...

ET2

...

48 Vdc

...

ET3

...

120 Vac 24 Vdc

48 Vdc

125 Vdc

...

ES9

...

ET4

120 Vac

...

ET5

ET6

ET7

None Included (S/T & UVR Only)

★ Does not include undervoltage trip accessory.
✚ 24 Vdc shunt close.

The minimum size control power transformer required for each spring charging
motor, shunt trip, shunt close or undervoltage trip is as follows:
Table 17: Minimum Size Control Power Transformer Required
For circuit breakers without electrical accessories but with the ground-fault option

150 VA

For circuit breakers with electrical accessories, with or without the ground-fault option

500 VA

For two or three circuit breaker throw-over systems

1000 VA

06/01

Bulletin No. 0603DB0102
June 2001

Shunt (Remote) Close Replacement Kit

Electronic Trip Insulated Case Circuit Breakers
Accessories

The shunt close device closes the circuit breaker contacts from a remote location.
This device is activated by a switch, pushbutton or a control relay in the same way
as a shunt trip device. The shunt close mechanism also includes a coil clearing
switch that automatically disconnects power to the shunt close coil when the circuit
breaker contacts have closed.
Table 18: Field-replaceable Accessory Kits

Shunt Trip Replacement Kit

Description

Voltage

Shunt Close
Replacement Kit

120 Vac

Field-replaceable Kit Catalog Number
S3SC120AC2

24 Vdc

S3SC024DC2

48 Vdc

S3SC048DC2

125 Vdc

S3SC125DC2

The shunt trip device opens the circuit breaker contacts from a remote location.
Table 19: Field-replaceable Accessory Kits

Undervoltage Trip Replacement Kit

Description

Voltage

Shunt Trip
Replacement Kit

120 Vac

Field-replaceable Kit Catalog Number
S3ST120AC2

24 Vdc

S3ST024DC2

48 Vdc

S3ST048DC2

125 Vdc

S3ST125DC2

When the monitored voltage drops below 35% to 70% of nominal voltage, the
undervoltage trip device opens the circuit breaker. The undervoltage trip prevents
the circuit breaker contacts from closing until the supply voltage rises above 85%
(+5%) of nominal voltage.
The undervoltage trip has an integral adjustable time delay feature. The time delay
adjustment is located on the undervoltage trip unit and can be adjusted with a
screwdriver. The time delay is adjustable from 0.1 to 1.5 seconds.
Table 20: Field-replaceable Accessory Kits
Description

Field-replaceable Kit Catalog Number

Undervoltage Trip
Replacement Kit

120 Vac

S3UVR120AC2

06033029

A Class 8430 phase failure relay used with a circuit breaker with an undervoltage
trip provides undervoltage protection on all three phases.
L1 L2 L3

Option
Control
Power
L1 L2 L3
Transformer
N.O.

Phase
Failure
Relay

N.C.

Note: For supply voltages other
than 120 Vac, a control power
transformer must be used to power
up the 120 Vac undervoltage trip.

120 Vac
Undervoltage Trip
Undervoltage Trip/Phase Failure Relay Wiring Diagram

31
06/01

Electronic Trip Insulated Case Circuit Breakers
Accessories

Auxiliary Switch Replacement Kit

Bulletin No. 0603DB9201
June 2001

Auxiliary switches are used with control circuits and indicator lights to provide
remote indication of the circuit breaker contact status (i.e., open or closed).
Auxiliary switches have one “A” contact and one “B” contact. The “A” contact is
open when the circuit breaker contacts are open and closed when the circuit
breaker contacts are closed. The “B” contact is closed when the circuit breaker
contacts are open and open when the circuit breaker contacts are closed.
Auxiliary switches can be reconfigured in the field to combinations of A and B
contacts. See instruction manual, Field-replaceable Accessories For SE
Electronic Trip Circuit Breakers for details.
Table 21: Auxiliary Switch Ratings
AC/DC Auxiliary Switches

AC Auxiliary Switches

SWITCH RATINGS:
(1 A minimum)
10 A 120 Vac 50/60 Hz
10 A 125 Vdc
1/4 hp 120 Vac 50/60 Hz
1/4 hp 125 Vdc

SWITCH RATINGS:
(0.04 A minimum)
10 A 120 Vac 50/60 Hz
1/4 hp 120 Vac 50/60 Hz

Table 22: Auxiliary Switch Accessory Kits
Description
Auxiliary Switch
Replacement Kit

Field-replaceable Kit Catalog Number
4 ac/dc

S34DCB2

4 ac/dc add on

S34DCT2

4 ac only

S34AC2

8 ac only

S38AC2

Factory-installed auxiliary switches are provided with a bell alarm. Factoryinstalled auxiliary switches and alarm switches are not sold separately.
The available factory-installed auxiliary and alarm switch combinations are shown
in the table below.
Table 23: Factory-installed Auxiliary/Alarm Switch Combinations
Auxiliary Switches
with Bell Alarms

AC Rated Auxiliary
Switches

AC/DC Rated
Switches

2A2B with 1 NO/NC

2 NO

2 NC

4A4B with 1 NO/NC

2 NO

2 NC

06/01

Bulletin No. 0603DB0102
June 2001

Alarm Switch Replacement Kit

Electronic Trip Insulated Case Circuit Breakers
Accessories

An alarm switch is used with control circuits and indicator lights to show that the
circuit breaker contacts have been opened because of any automatic tripping
action or an undervoltage trip. Opening the circuit breaker manually (pressing the
push-to-open button) or a shunt trip will not activate the alarm contacts.
Table 24: Alarm Switch Accessory Kit
Description

Field-replaceable Kit Catalog Number

Alarm Switch Replacement Kit 2 ac Only

S3AS2

Alarm switch replacement kits (catalog number S3AS2) have one A and one B
alarm switch per kit. Alarm switches (used on the SE circuit breaker only) can be
reconfigured in the field to combinations of A and B contacts. See instruction
manual, Field-replaceable Accessories for SE Electronic Trip Circuit Breakers for
details.
Alarm Switch Ratings
(0.04 A min.)
10 A, 120/240 Vac, 50/60 Hz
1/4 hp, 120 Vac, 50/60 Hz
Push-to-open Padlock Attachment

The padlock attachment (catalog number SE2PA) permits the padlocking of an
SEF circuit breaker in the OPEN position. This attachment is available as a field
installable accessory only.
The SE padlock attachment holds the push-to-open button in the depressed
position and prevents the SEF circuit breaker from being closed. This attachment
accepts up to three 3/8 in. diameter shackle padlocks. The padlock feature is
built-in on SED/SEHD circuit breakers.

Close Button Cover

The close button cover (catalog number SE1CBC) is used to inhibit manual closing
of SE circuit breakers. This attachment is available as a field-installable accessory
only.
The close button cover is mounted directly to the SE circuit breaker face, over the
push-to-close button. In an emergency situation the circuit breaker can be closed
by inserting a small screwdriver through the hole in the close button cover and
pushing the button with the screwdriver.

Primary Injection Test Plug

The primary injection test plug (catalog number SEPITK2) is used with Series 2, 3,
3A, and 3B circuit breakers in primary injection testing of drawout SE insulated
case circuit breakers with integral ground-fault protection when tested outside of
the cradle. This device is available as a field-installable accessory only.
SED insulated case circuit breakers with the internal ground-fault protection feature
must have certain terminals jumpered (or wired) to connect the secondary sensing
wiring. The primary inejction test plug makes it easier to complete these
connections. This test plug also jumpers restraint out to restraint in for short-time
and ground-fault delays, so the trip unit will follow the trip curve.

33
06/01

SE Drawout Crank

Bulletin No. 0603DB9201
June 2001

The drawout crank
(catalog number
SEDC) operates an
SE circuit breaker
drawout mechanism.
It is required to rack an
SED or an SEM into or
out of the drawout cell.

06033030

Electronic Trip Insulated Case Circuit Breakers
Accessories

Drawout
Position
Indicator

Drawout
Access
Cover

Drawout
Crank

The SE insulated case circuit breaker has mechanical interlocks to deter incorrect
operation. Interlocks minimize the possibility of contact with energized parts or
exposure to a hazardous condition. The interlock features are described below.

KEY INTERLOCKS (OPTIONAL)

Key interlocks mechanically interlock the
operation of the circuit breaker with the
operation of other keyed devices.

06033031

Interlocks

Fixed Circuit
Breaker Key
Interlock

NOTE: Key interlock devices are not
supplied by Square D and must be ordered
separately.
A bracket must be used to mount a key
interlock device on an SEF circuit breaker.
Key interlock mounting brackets (catalog
number SE1KI) are available as fieldinstallable accessories when used on fixed
mounted SE circuit breakers. On drawout SE
circuit breakers, the mounting bracket must
be ordered as a part of the carriage
assembly and is not field installable on the
drawout carriage.
UNDERVOLTAGE TRIP/CLOSE BUTTON
INTERLOCK

This optional accessory prevents the closing of the circuit breaker contacts during
a low-voltage condition. The undervoltage/close button interlock mechanically
interferes with the operation of the push-to-close button. If an undervoltage trip
accessory is installed in the circuit breaker, it must be energized before the circuit
breaker can be closed either manually or electrically.
This interlock is a function of the undervoltage trip device. This is a fieldreplaceable accessory.
If the undervoltage trip has been factory installed, it can be changed in the field.
The undervoltage trip must be electrically energized prior to closing the circuit
breaker contacts. An attempt to close the circuit breaker electrically without
energizing the undervoltage trip opens the fuse on the shunt close. Consult the
circuit breaker instruction manual for specifications of replacement fuses.
Contact your local Square D Sales Office or the Square D Field Services Division
for more information on field accessibility and replaceability.

AUXILIARY COVER INTERLOCK

All SE insulated case circuit breakers have an auxiliary cover that restricts access
to any internally-mounted accessories. The auxiliary cover interlock prevents the
removal of the auxiliary cover when the circuit breaker contacts are closed, or
when the drawout mechanism is in any but the disconnected position.
The auxiliary cover is held in place by retaining screws. If it is not properly
installed, the auxiliary cover interlock will prevent the circuit breaker from being
closed.

06/01

Bulletin No. 0603DB0102
June 2001

Electronic Trip Insulated Case Circuit Breakers
Accessories

If the electronic trip unit is removed, the trip unit interlock prevents the circuit
breaker from being closed. During certain auxiliary device replacement
procedures (such as auxiliary switch replacement) the trip unit must be
unmounted. The interlock accessory verifies that the trip unit has been
correctly reinstalled.

CELL DOOR INTERLOCK

The cell door interlock minimizes the possibility of contact with energized
parts or exposure to hazardous conditions.

ACCESS COVER INTERLOCK

Drawout SE
insulated case
circuit breakers
have a sliding
cover that
permits (or
restricts) access
to the drawout
racking
mechanism.

06789703

TRIP UNIT INTERLOCK

NOTE: This
device is factory
installed and is
not field
replaceable.
SE Circuit Breaker with
Drawout Access Cover

The access cover
interlock
prevents:

• closing the circuit breaker contacts while the access cover is open.
• opening the access cover while the circuit breaker contacts are closed.

Drawout Mechanism Lockout

This accessory prevents
access to the drawout
mechanism. This device
accepts up to three padlocks
with a maximum shackle
diameter of 3/8 inch.

06783068

The drawout access cover is held open if the circuit breaker drawout
mechanism is between the connected and test/disconnected positions.

The drawout mechanism
lockout can be used to lock the
circuit breaker in the connected
or test position. It can also
prevent the circuit breaker from
being closed by holding the
drawout access cover open.

Padlocked Drawout Mechanism

35
06/01

Drawout Carriage Padlock Hasp

Bulletin No. 0603DB9201
June 2001

This accessory, used with a padlock, prevents a
drawout circuit breaker from being connected in a
drawout cell. A padlock installed on the padlock hasp
interferes with the movement of the circuit breaker on
the carriage rails.

06789701

Electronic Trip Insulated Case Circuit Breakers
Accessories

Padlocked Drawout
Carriage Hasp

OEM Drawout Carriage Assemblies

The drawout carriage assembly contains the hardware necessary to mount an SE
insulated case circuit breaker in a piece of OEM end-use equipment. The assembly
includes drawout rails, a secondary connector on the end of a 96-in. cord and
terminal blocks for user secondary wiring.
NOTE: The drawout carriage assembly can be ordered with provisions to accept a
key interlock. The key interlock mounting bracket must be ordered as a part of the
OEM carriage assembly and is not field installable on the drawout carriage. Key
interlock devices are not supplied by Square D and must be ordered separately.
Table 25: Drawout Carriage Assemblies
Description

Catalog Number Control Voltage of Cooling Fan (4000 A Only)*

96-in. Cord
2000 A
2000 A with Key Interlock

SE3CR22000
SE3CR2K2000

...

3000 A
SE3CR23000
3000 A with Key Interlock SE3CR2K3000

...

4000 A
4000 A with Key Interlock

SE3CR240001
SE3CR2K40001

120/208 V

4000 A
4000 A with Key Interlock

SE3CR240002
SE3CR2K40002

240 V

4000 A
4000 A with Key Interlock

SE3CR240003
SE3CR2K40003

480 V

4000 A
4000 A with Key Interlock

SE3CR240004
SE3CR2K40004

600 V

*Fan cooling system provided as standard with circuit breaker (to be mounted in 4000 A cradle only).

06789706

SE 4000 A Circuit Breaker Cooling Fan
Cooling Fan
Push-to-test
Button

This accessory is a feature of the 4000 A drawout SE insulated case circuit breaker.
It produces air flow around the circuit breaker and carriage connections as the
circuit breaker nears full load. The catalog number for the 4000 A drawout carriage
specifies the control voltage of the cooling fan.
The fan is automatically turned on as the current passing through the circuit breaker
nears 4000 A. A set of thermal limit switches in each pole of the circuit breaker
regulate fan operation. The fan cooling circuit contains an integral self-test feature,
operated by a push-to-test button on the circuit breaker face.
The SED 4000 A circuit breaker with fan cooling also provides a high temperature
backup to protect the circuit breaker from damage due to excessive heat. This
system also uses three thermal sensors, one in each pole. If the temperature of any
one of the three line terminals reaches the allowable UL standard for material index
thermal limits, that sensor will open and send a signal to the MICROLOGIC® trip
unit to open the circuit breaker. This condition will only occur if the current is over
3500 A and the cooling fan fails to operate.
According to the voltage specified by the drawout carriage assembly catalog
number, fan control power must be supplied from an additional power source.
Additional interlocks are provided with the SED 4000 ampere breaker and cradle to
insure that a lower rated circuit breaker will not operate in a 4000 A compartment.
The interlocks also prevent a 4000 A circuit breaker from fitting into a lower
rated cradle.

06/01

Electronic Trip Insulated Case Circuit Breakers
Glossary
GLOSSARY
accessory (device) = an electrical or mechanical device that
performs a secondary or minor function apart from overcurrent
protection.
AIC = see AIR
AIR = amps interrupting rating.
alarm switch (bell alarm) = a mechanically-operated switch
which indicates when a circuit breaker has tripped due to
overcurrent conditions.
ambient temperature rating = the temperature of the air
immediately surrounding the circuit breaker which can affect
the thermal (overload) tripping characteristics of thermalmagnetic circuit breakers. Electronic trip circuit breakers,
however, are insensitive to normal (-20° to 50°C) ambient
conditions.
ammeter/trip indicator (local current meter/trip indicator) =
a module that mounts directly to the circuit breaker trip unit.
The ammeter (current meter) reports rms phase and groundfault current values as seen by the trip unit. Current values are
displayed one phase at a time. The trip indicator displays
whether the circuit breaker tripped due to an overload, shortcircuit or ground-fault condition.
auxiliary cover = the removable cover on the front of an SE
insulated case circuit breaker. The trip unit and all electrical
accessories are mounted behind the auxiliary cover.
auxiliary switch = a switch mechanically operated by the main
device for signaling, interlocking, or other purposes.
bell alarm = see alarm switch.

current path (of a circuit breaker) = the current-carrying
conductors within a circuit breaker between, and including, line
and load terminations.
current transformer (current sensor) (CT) = an instrument to
measure current, encircling a conductor carrying the current to
be measured or controlled.
drawout mounting circuit breaker = an assembly of a circuit
breaker with a supporting structure so constructed that the
circuit breaker is supported and can be moved to either the
main circuit connected or disconnected position without
removing connections or mounting supports.
drawout mechanism = a mechanism which engages the
drawout carriage assembly and draws the circuit breaker into or
out of the switchboard. The drawout mechanism assembly
includes the following components: 1) Drawout mechanism
operator shaft 2) Drawout levering device arms 3) Drawout
position indicator.
drawout position indicator = an indication means which
shows the position of the circuit breaker in the drawout carriage
(connected or disconnected.)
drawout shaft cover = a shutter which allows or restricts
access to the drawout shaft.
electrical operator (motor operator) = an electrical
controlling device which is used to open and close a circuit
breaker or switch and reset a circuit breaker.
electronic trip circuit breaker = a circuit breaker which uses
current sensors and electronic circuitry to sense, measure and
respond to current levels.

branch circuit = the circuit conductor between the final
overcurrent device protecting the circuit and the outlet(s).

fixed mounting = a circuit breaker mounted such that it cannot
be removed without removing primary and sometimes
secondary connections or mounting supports.

circuit breaker = a device designed to open and close a circuit
by non-automatic means and to open the circuit automatically
on an overcurrent without damage to itself when properly
applied within its rating.

frame size = a group of circuit breakers of similar physical
configuration. Frame size is expressed in amperes,
corresponding to the largest ampere rating available in the
group.

circuit breaker frame = the circuit breaker housing which
contains the current carrying components, the current sensing
components, and the tripping and operating mechanism.

frequency = the number of cycles per second for an
alternating current system.

coil clearing switch = a mechanically-operated switch in
series with the coil of a shunt trip device which breaks the coil
current when the circuit breaker opens.
continuous current rating (handle rating) = the designated
rms alternating current in amperes which a device or assembly
will carry continuously in free air without tripping or exceeding
temperature limits.
continuous load = a load where the maximum current on the
circuit is expected to continue for three hours or more.
CSA = Canadian Standards Association.
CT = current transformer.

frequency rating = the range of frequencies within which a
product can be applied.
ground fault = an unintentional current path, through ground,
back to the source.
ground-fault delay = the length of time the circuit breaker trip
unit will delay before initiating a trip signal to the circuit breaker
after a ground fault has been detected.
ground-fault pickup = the level of ground-fault current at
which the trip system begins timing.
IEC = International Electrotechnical Commission.
IEEE = Institute of Electrical and Electronics Engineers.
instantaneous pickup = the current level at which the circuit
breaker will trip with no intentional time delay.
37

06/01

Electronic Trip Insulated Case Circuit Breakers
Glossary
instantaneous trip = (as applied to circuit breakers) a
qualifying term indicating that no delay is purposely introduced
in the tripping action of the circuit breaker during short-circuit
conditions.
insulated case circuit breaker = a term to describe UL
Standard 489 Listed non-fused molded case circuit breakers
which utilize a two-step, stored energy mechanism, and an
electronic trip system.
integral ground-fault protection = equipment ground-fault
protection on grounded neutral systems provided by
components internal to the circuit breaker.
interchangeable trip unit = a trip unit which can be
interchanged by a user among circuit breaker frames of the
same design.
interrupting rating = the highest current at rated voltage
available at the incoming terminals of the circuit breaker.
When the circuit breaker can be used at more than one
voltage, the interrupting rating will be shown on the circuit
breaker for each voltage level. The interrupting rating of a
circuit breaker must be equal to or greater than the available
short-circuit current at the point at which the circuit breaker is
applied to the system.
inverse time = a qualifying term indicating there is purposely
introduced a delay in the tripping action of the circuit breaker,
which delay decreases as the magnitude of the current
increases.
I2t = let-through.
I2t IN = an inverse time delay characteristic.
I2t OUT = a constant time delay characteristic.
let-through (I2t) = an expression related to energy (measured
in ampere-squared seconds) which passes through an
overcurrent protective device during an interruption.
levering device arm = an arm which engages a slot in the
drawout carriage assembly and which, when rotated, draws
the circuit breaker into or out of the switchboard.
LI (dual trip device) = a combination of adjustable trip
functions including long-time ampere rating, long-time delay,
and instantaneous pickup.
LIG (dual with ground trip device) = a combination of
adjustable trip functions including long-time ampere rating,
long-time delay, instantaneous pickup, ground-fault pickup and
ground-fault delay.
local current meter = ammeter/trip indicator.
long-time ampere rating = an adjustment which, in
combination with the installed rating plug, establishes the
continuous current rating of an electronic trip circuit breaker.
long-time delay = the length of time the circuit breaker will
carry a sustained overload (greater than the long-time pickup)
before initiating a trip signal.
long-time pickup = the current level at which the circuit
breaker long-time delay function begins timing.

LS (LSI) = a combination of adjustable trip functions including
long-time ampere rating, long-time delay, short-time pickup,
short-time delay and a defeatable instantaneous pickup.
LSG (LSIG) = a combination of adjustable trip functions
including long-time ampere rating, long-time delay, short-time
pickup, short-time delay, defeatable instantaneous pickup,
ground-fault pickup and ground-fault delay.
MICROLOGIC = the SQUARE D family of electronic trip
systems available on molded case circuit breakers, insulated
case circuit breakers and low-voltage power circuit breakers.
molded case circuit breakers = a circuit breaker which is
assembled as an integral unit in a supportive and enclosed
housing of insulating material.
neutral current transformer = a current transformer which
encircles the neutral conductor; required for use with circuit
breakers with integral ground-fault protection, when applied on
a grounded system.
operating mechanism = an internal mechanical system
which opens and closes the circuit breaker contacts.
overcurrent = any current in excess of the rated continuous
current of electrical equipment or the ampacity of a conductor.
overcurrent trip element = a device that detects an
overcurrent and transmits the energy necessary to open the
circuit breaker automatically.
overcurrent trip switch = see alarm switch.
overload delay = the length of time the circuit breaker will
carry a sustained low-level overcurrent before initiating a trip
signal.
peak current sensing = a method of determining the current
flowing in a circuit by measuring the peak amplitude of the
current wave each half cycle, then calculating the effective
rms. (The effective rms value is assumed to equal 0.707 times
the measured peak. This results in accurate rms values on
pure sinusoidal waveforms only.)
peak let-through = the maximum peak current in a circuit
during an overcurrent condition.
PUSH-TO-CLOSE button = a button for manually closing the
circuit breaker.
PUSH-TO-OPEN button = a button for manually opening the
circuit breaker.
rating plug = a component which plugs into the trip unit,
establishing the ampere rating of the circuit breaker.
residual sensing = a means of checking for current
imbalance by using a current sensor across each currentcarrying conductor to check the magnitude of current flowing
in each conductor, then summing all current sensors to check
for a current imbalance.
restraint interface module (RIM) = a component which
allows zone-selective interlocking communication between
SQUARE D full-function electronic trip systems, add-on
ground-fault modules and zero-sequence ground-fault relays.

06/01

Electronic Trip Insulated Case Circuit Breakers
Glossary
RIM = restraint interface module.
rms = root-mean-square.
rms current sensing = a method of determining the true rms
current of sinusodial and non-sinusoidal waveforms by
sampling the current waveform a number of times per cycle,
then calculating the true rms value. (SQUARE D circuit
breakers sample 33 times per cycle.)

zone-selective interlocking (ZSI) = a communication
capability between electronic trip systems and ground-fault
relays which permits a short circuit or ground fault to be
isolated and cleared by the nearest upstream device with no
intentional time delay.

STD = short-time delay.

zone-selective interlocking = zone-selective interlocking
(ZSI, also called zone restraint) is used to reduce the stress on
electrical distribution equipment during fault conditions while
maintaining coordination. ZSI allows electronic trip devices to
communicate with each other so that a short circuit or ground
fault will be isolated and cleared by the nearest upstream circuit
breaker with no intentional time delay. Devices in all other areas
of the system (including upstream) remain closed to maintain
service to unaffected loads. ZSI limits faults stress on the
power distribution system by reducing the time it takes to clear
the fault, while maintaining system coordination between
overcurrent protective devices. ZSI is a standard feature on
MICROLOGIC full-function circuit breakers. In order to have a
functional ZSI system, SQUARE D electronic trip devices
require interconnect wiring between their terminal strips using
a twisted pair of #14 or #18 AWG conductors. For more
information on zone-selective interlocking, see Application
Guide 0600SC9102R6/95, Reducing Fault Stress with Zoneselective Interlocking.

terminal block = the connections for control wiring.

ZSI = zone-selective interlocking.

root mean square = the square root of the arithmetic mean of
the squares of a set of numbers.
sensor = current sensing element within a circuit breaker
frame. The sensor has a current rating less than or equal to the
frame size and provides the sensing function for a specific
group of current ratings within the frame size.
short-time (short-circuit) delay = the length of time the circuit
breaker will carry a short circuit (current greater than the shorttime pickup) before initiating a trip signal.
short-time (short-circuit) pickup = the current level at which
the circuit breaker short-time delay function begins timing.
shunt trip = an accessory which trips the circuit breaker from
a remote location using an external voltage source.

thermal-magnetic circuit breaker = a general purpose term
for circuit breakers that use bimetals and electromagnetic
assemblies to provide both overload and short-circuit
protection.
trip indicator = a module that mounts directly to the circuit
breaker trip unit that displays whether the circuit breaker
tripped due to an overload, a short-circuit or a ground-fault
condition.
trip indicator reset = a button on the trip indicator module
used to reset the trip indicator.
trip system = a system which consists of a MICROLOGIC trip
unit, current transformers, and trip coil.
trip unit = a programmable microprocessor-based device
which measures and times current flowing through the circuit
breaker and initiates a trip signal when appropriate.
UL = Underwriters Laboratories Inc.
undervoltage trip (UVR) = an accessory which trips the circuit
breaker automatically when the monitored circuit voltage falls
below a predetermined percentage of its specified value.
UVR = undervoltage trip release.
withstand rating = the level of rms symmetrical current that a
circuit breaker can carry with the contacts in a closed position
for a stated period of time (usually described as the number of
cycles).
zero-sequence sensing = a means of sensing the current
flowing on a circuit by using one current sensor surrounding all
current-carrying conductors, then checking for current
imbalance in the currents flowing in all directions.
39
06/01

Square D Company
PO Box 3069
3700 Sixth St SW
Cedar Rapids IA 52406-3069 USA
1-888-SquareD (1-888-778-2733)
www.SquareD.com

Square D and
are registered trademarks of Square D Company or related companies. All other
trademarks are the intellectual property of their respective companies.
Electrical equipment should be serviced only by qualified electrical maintenance personnel. No
responsibility is assumed by Square D for any consequences arising out of the use of this material.
Bulletin No. 0603DB0102 June 2001 Replaces 0603CT9201R12/95 dated 08/97.

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Keywords                        : insulated case, electronic trip, MICROLOGIC trip unit, MICROLOGIC, ratings, testing, zone selective, dimensions, accessories
Modify Date                     : 2001:06:18 08:47:04-05:00
Subject                         : Class 603
Author                          : Schneider Electric
Title                           : Electronic Trip Insulated Case Circuit Breakers
Create Date                     : 2001:04:25 09:13:35
Page Count                      : 40
Page Mode                       : UseOutlines

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Electronic Trip Insulated Case Circuit Breakers 121853 Catalog

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