Cutler Hammer, Div of Eaton Corp JDB, JD, HJD, JDC, JW Instruction Sheet

I.L. 29C103G

JWC Circuit Breakers and Molded Case Switches

nel and equipment as well as all general and local
health and safety laws, codes, and procedures.

The recommendations and information contained herein
are based on Cutler-Hammer experience and judgment,
but should not be considered to be all-inclusive or cov­ering every application or circumstance which may
arise. If any questions arise, contact Cutler-Hammer for
further information or instructions.

1. INTRODUCTION

General Information

The J-frame Series C circuit breaker (Figure 1-1) types
JD, JDB, HJD, and JDC are 600 Vac maximum rated
devices with inter changeable thermal-magnetic trip
units rated 250A maximum continuous current. Circuit
breaker types JW, HJW, and JWC are 660 Vac maxi­mum rated devices using interchangeable adjustable
thermal/adjustable magnetic or electronic trip units rated
up to 250A continuous current. The type JDB noninter­changeable trip circuit breaker is rated 600 Vac maxi­mum with a maximum continuous current rating of
250A. Refer to Table 1-1 for all available trip unit rat-

DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS ENER­GIZED. DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE CAN RESULT
FROM CONTACT WITH ENERGIZED EQUIPMENT.
ALWAYS VERIFY THAT NO VOLTAGE IS PRESENT
BEFORE PROCEEDING WITH THE TASK, AND
ALWAYS FOLLOW GENERALLY ACCEPTED SAFE­TY PROCEDURES.

CUTLER-HAMMER IS NOT LIABLE FOR THE MISAP­PLICATION OR MISINSTALLATION OF ITS PROD­UCTS.

The user is cautioned to observe all recommendations,
warnings, and cautions relating to the safety of person-

Figure 1-1 J-Frame Model D Series C Circuit Breaker
with JT Trip Unit Installed

WARNING

Circuit Breaker Trip Unit Types
Types Thermal-Magnetic Amperes I

n

Fixed Adjustable Adjustable
Thermal Thermal Magnetic

of I

n

JDB 70 5 to 10
JD 90
HJD 100
JDC JW 125 100-125

HJW 150 125-160
JWC

175
200 160-200
225
250 200-250

Not UL listed.
For adjustable thermal trip units, the magnetic setting is a multiple
of the maximum thermal setting.

Table 1-1 Available Trip Unit Ratings

Installation Instructions for JDB, JD, HJD, JDC, JW HJW,

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1

2

1
2

I.L. 29C103G

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ings. Model D circuit breakers are listed in accordance
with Underwriters’ Laboratories, Inc. Standard UL489
and satisfy the (P1) requirements of the International
Electrotechnical Commission Recommendations No.
IEC 157-1 Model W circuit breakers satisfy the require­ments of IEC 947-2. Molded case switches are listed in
accordance with UL 489.

This instruction leaflet (IL) gives procedures for installa­tion and field testing of J-frame Series C circuit break­ers. For this publication, the term circuit breaker shall
also include the molded case switch.

2. INSTALLATION

The installation procedure consists of inspecting the cir­cuit breaker and, as applicable, installing the trip unit,
accessories, interphase barriers and terminals; mount­ing the circuit breaker; connecting the line and load con­ductors; torquing terminals; and attaching terminal
shields. Circuit breaker frames, trip units, accessories,
mounting hardware, and unmounted terminals may be
supplied in separate packages. To install the circuit
breaker, perform the following steps.

JDB circuit breakers are factory sealed for reverse
feed applications under UL489. UL requires that
internal accessories be installed at the factory in
this type of circuit breaker.

For hardware conversion kits and handle mechanisms
required to replace existing Cutler-Hammer circuit
breakers.

If required, internal accessory installation in any type of
circuit breaker should be done before the circuit breaker
is mounted and connected. Refer to individual accesso­ry instruction leaflets.

Circuit breaker mounting hardware is supplied separate­ly.

2-1. Make sure that the circuit breaker frame is suitable
for the intended installation by comparing nameplate
data with existing ratings and system requirements.
Inspect the circuit breaker for completeness, and check
for damage before mounting. Uninstalled cover mount­ing hardware is supplied in a plastic bag with the circuit
breaker frame. (See Figure 2-1)

2-2. Remove installed cover screws and cover.

Figure 2-1 Cover Mounting Hardware

Pan Head Screws

Thread-Forming Screws

Figure 2-2 Cover Screw Installation Positions

NOTICE

On/

Off/

Screw, .190-32 x 3.13 Inch, Pan Head, Cross-Recessed.

Screw, No. 8 x 1.88 Inch, Pan Head, Cross-Recessed,
Thread Forming.

Screw, No. 6 x 1.50 Inch, Pan Head, Cross-Recessed,
Thread Forming (used with 4 Pole Only)

Note: Hatched lines show additional pole and screws for
4-pole circuit breaker.

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The circuit breaker handle must be in the tripped or
OFF position to remove the cover. Instructions for
installing the trip unit accessories are supplied with
the devices.

2-3. If not already installed, mount trip unit and acces­sories (if required) in circuit breaker frame.

WHEN REMOVED AND REINSTALLED, THREAD­FORMING SCREWS WILL TRY TO REFORM THE
THREADS IN THE BASE. CARE SHOULD BE TAKEN
EVERY TIME A THREAD-FORMING SCREW IS USED
TO ENSURE THE SCREW STARTS IN THE ORIGINAL
THREADS. DAMAGED THREADS CAN RESULT IN
IMPROPER CIRCUIT BREAKER COVER RETENTION.

2-4. Install cover, and secure with pan-head screws fol­lowed by threadforming screws, as shown in Figure 2-2.

2-5. If not already installed, mount terminals as shown
in Figure 2-3. When using terminal (Catalog No.
TA250KB), secure the terminal to the circuit breaker
using a 1/8-inch socket wrench and torque to 6-8 lb.-ft
(8-11 N.m). After mounting the circuit breaker and

before installation of the conductors, the terminal mount­ing screw can be checked or retightened through the
terminal when the conductor screw is removed. When
using terminal (Catalog No. T250KB), secure the termi­nal to the circuit breaker using screw and nut. Torque to
7-9 lb.-in (0.8-1.0 N.m).

THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
BEFORE MOUNTING THE CIRCUIT BREAKER IN AN
ELECTRICAL SYSTEM, MAKE SURE THERE IS NO
VOLTAGE PRESENT WHERE WORK IS TO BE PER­FORMED. SPECIAL ATTENTION SHOULD BE PAID
TO REVERSE FEED APPLICATIONS TO ENSURE
NO VOLTAGE IS PRESENT.

Depending on the equipment configuration, the cir­cuit breaker can be mounted using different styles
of hardware. The following steps describe how to
mount the circuit breaker using standard hardware.
When special hardware is needed (for example, with
the electrical operator), the instruction leaflet
describing the accessory also describes the special
mounting arrangements.

2-6. To mount the circuit breaker, perform the following
steps:

a. For individual surface mounting, drill mounting panel

using the drilling plan shown in Figure 2-4. For panel­board mounting, only load end support mounting
holes are required. For deadfront cover applications,
cut out cover to correct escutcheon dimensions. (See
Figure 2-5)

b. If circuit breaker includes factory- or field-installed

internal accessories, make sure that accessory
wiring can be reached when the circuit breaker is
mounted.

Labels with accessory connection schematic dia­grams are provided on the side of the circuit breaker.
A note should be made of the diagrams if the labels
cannot be seen when the circuit breaker is mounted.

Figure 2-3 Terminal Installation

NOTICE

NOTICE

!

CAUTION

!

WARNING

NOTICE

Terminal
Connectors

TA250KB Terminal

Collar

Page 3

Collar

Socket
Screw

Flat-Head
Screw

T250KB Terminal

Nut

Torque cover screws to 18-23 lb-in (2-2.6 N.m.).