Cutler-Hammer
FLED O 272.147
I.L. 29C141C
Installation Instructions for Low Energy Shunt Trip for EHD, FDB, FD, HFD,
FDC, FW, HFW, FWC Circuit Breakers, Molded Case Switches, and Motor
Circuit Protectors
À WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM MAIN-
TENANCE ON EQUIPMENT WHILE IT IS ENERGIZED.
DEATH, SEVERE PERSONAL INJURY, OR SUBSTAN-
TIAL PROPERTY DAMAGE CAN RESULT FROM
CONTACT WITH ENERGIZED EQUIPMENT. ALWAYS
VERIFY THAT NO VOLTAGE IS PRESENT BEFORE
PROCEEDING WITH THE TASK, AND ALWAYS FOL-
LOW GENERALLY ACCEPTED SAFETY
PROCEDURES.
CUTLER-HAMMER IS NOT LIABLE FOR THE MISAP-
PLICATION OR MISINSTALLATION OF ITS
PRODUCTS.
The user is cautioned to observe all recommendations,
warnings, and cautions relating to the safety of personnel
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 judgement,
but should not be considered to be all-inclusive or cover-
ing every application or circumstance which may arise. If
any questions arise, contact Cutler-Hammer for further
information or instructions.
1. INTRODUCTION
General Information
The low energy shunt trip (LEST) (Fig. 1-1) is designed to
interface with a customer ground fault detection circuit.
The LEST consists of an intermittent-rated solenoid with
a plunger and a reset lever assembied to a plug-in mod-
ule, which is mounted in the right or left accessory cavity.
The reset lever resets the LEST when the trip signal is
removed and the circuit breaker handle is moved to the
reset (extreme OFF) position.
The LEST is rated at 24VDC and is designed to trip the
circuit breaker when a 100 microfarad capacitor charged
to 12 Vdc is discharged through the solenoid. Endurance
for the LEST is 6000 electrical operations plus 4000
mechanical operations.
©
SS
SE À
5 |
0
eo
E
E—
—
E
6606C76H15
Fig. 1-1 Low Energy Shunt Trip Installed in F-Frame
Circuit Breaker
For this publication, the term circuit breaker shall also
include molded case switch and motor circuit protector.
Depending on the model ordered, connections for the low
energy shunt trip are in one of four forms. The standard
wiring configuration is pigtail leads exiting the rear of the
base directly behind the LEST. Optional configurations
include a terminal block mounted on the same side of the
base as the accessory, leads exiting the side of the base
where the accessory is mounted, and leads exiting the
rear of the base on the side opposite the accessory. The
18-inch long pigtail leads are color coded for identifica-
tion: the terminal block terminals are labeled. For allow-
able locations of all accessories, refer to Frame Book
29-101.
Note: When the walking beam interlock is used with
the circuit breaker, the rear trough cannot be used for
accessory pigtail leads.
This instruction leaflet (IL) gives detailed procedures to
install the LEST.
Effective November 1998 Supersedes |.L. 29C141B dated December 1997
E:T-N
Page 2
|... 290141C
2. INSTALLATION
Note: For sealed circuit breakers, Underwriters
Laboratories, Inc. UL489 requires that internal
accessories be installed at the factory. The LEST is
listed only for factory installation under UL file
E7819.
Where local codes and standards permit and UL
listing is not required, internal accessories can be
field-installed.
Before attempting to install the LEST, check that the
catalog number is correct and that the rating of the
accessory satisfies job requirements.
The LEST is shown in kit form in Fig. 2-1 and can be sup-
plied as either a right- or left-hand assembly. Depending
on the catalog number ordered, the LEST can be
installed in the right accessory mounting cavity of a
2-pole circuit breaker, in the left or right cavity of a 3-pole
circuit breaker, or in the left cavity only of a 4-pole circuit
breaker. ALEST must be installed in the circuit breaker
before the circuit breaker is mounted in an electrical sys-
tem. To install the LEST, perform the following proce-
dures:
Note: A circuit breaker that is mounted in an
electrical system must be removed to install the
accessory. To ensure correct accessory installation,
the circuit breaker must be placed on a horizontal
LEST Plug-in
Module With С)
Pigtail Leads
Replacement Interphase
Barrier (Thermal Magnetic
Circuit Breakers Only)
Accessory Identification
Replacement Interphase Nameplate
Barrier (HMCP Only)
| 5 | й (Es) т
Connection Diagram
6606C76H18
Accessory Barrier Label
surface.
À WARNING
BEFORE REMOVING A CIRCUIT BREAKER
INSTALLED IN AN ELECTRICAL SYSTEM, MAKE
SURE THE CIRCUIT BREAKER IS SWITCHED TO THE
OFF POSITION AND THERE IS NO VOLTAGE
PRESENT WHERE WORK IS TO BE PERFORMED.
SPECIAL ATTENTION SHOULD BE PAID TO
REVERSE FEED APPLICATIONS. THE VOLTAGES IN
ENERGIZED EQUIPMENT CAN CAUSE DEATH OR
SEVERE PERSONAL INJURY.
Note: To install the LEST, the circuit breaker
operating mechanism must be in the tripped
position.
Fig. 2-1. Low Energy Shunt Trip Kit
2-1. Switch circuit breaker to the OFF position.
2-2. Disconnect and remove circuit breaker from instal-
lation and terminal connections.
2-3. Remove eight cover screws and cover. The handle
must be in the OFF position if the circuit breaker
has a cover interlock.
À caution
DURING INSTALLATION AND FUNCTIONAL CHECKS
OF THE LEST, DO NOT TOUCH THE CIRCUIT
BREAKER CALIBRATED TRIP MECHANISM. CON-
TACT WITH THE CALIBRATED TRIP MECHANISM
COULD CHANGE TRIP CHARACTERISTICS.
Note: For a LEST having rear or opposite-side exiting
pigtail leads, thread leads through trough in side of
base before attempting to install the accessory.
Pigtail leads exiting in this manner must be eased
through trough as LEST is inserted into mounting
cavity.
2-4. Press PUSH-TO-TRIP button below escutcheon to
trip the operating mechanism.
E:T-N
Effective November 1998
I.L. 2961416
Page 3
2-5. Route wiring to meet installation requirements.
(See Fig. 2-2.)
2-6. Insert LEST as described in the following steps
(Fig. 2-3):
Rear Exiting Leads Terminal Block
(Preferred)
Side Exiting Leads Opposite-Side Exiting
Leads
Fig. 2-2. Accessory Wiring Options
Left-Hand LEST
Above Accessory
Mounting Cavity
—— 2
я
©
== =
#
ars,
€
Type Shown)
| 77
EUA | Right-Hand
CSSS и LEST Installed
| 53 N S (Pigtail Lead
| | | ra
»
|
Fig. 2-3. LEST Installation Positions
Remove interphase barrier between accessory
mounting cavity and operating mechanism as
shown in Fig. 2-4. For HMCP, remove outer
portion only of 2-part interphase barrier.
Lift out arc extinguisher located on the same
side of the circuit breaker to be used for acces-
sory installation.
Slide accessory barrier into position between
molded crossbar and trip bar. Long leg of bar-
rier must go into slot in base. Bend barrier over
and put T-shaped end into moving contact siot
in base. (See Fig. 2-5.)
Install arc extinguisher.
Reset LEST by pushing solenoid piunger to
fully retracted position.
Put tip of LEST reset tab through square open-
ing in replacement interphase barrier. (See Fig.
2-6.)
Slide LEST plug-in module and replacement
interphase barrier slowly into mounting slots in
base. Gentle pressure on circuit breaker handle
towards arc extinguishers will assist LEST reset
lever past handle. For terminal block assem-
blies, slide terminal block into mounting slot in
side of base as plug-in module is being posi-
tioned.
For HMCP, LEST plug-in module can be
inserted prior to installation of replacement
interphase barrier.
Before plug-in module seats fully in mounting
slots, press circuit breaker trip bar back against
magnet armature, and seat accessory. Make
sure LEST trip lever touches flat surface of trip
bar (Fig. 2-7) and reset tab is operated by the
handle arm.
К required, complete routing of opposite-side
exiting leads.
Effective November 1998
E TN
Page 4
I.L. 2961416
Molded
Bearing
interphase Barrier
Supplied With
LEST Kit.
Install Together
With LES
ea
Remove Interphase
Barrier installed
in Circuit Breaker
Fig. 2-4. Position of Interphase Barrier and Molded
Bearing
T-Shaped End |
SS
г ` = 2
ih >
foo Accessory
Barrier
Long
a Leg of
Barrier
\ Stot
Moving
Contact
Slot
Arc Base
Extinguisher
Removed
Fig. 2-5. Accessory Barrier Installation Position
À WARNING
WHEN CHECKING THE ACCESSORY, DO NOT PUT
FINGERS NEAR MOVING PARTS INSIDE THE CIR-
CUIT BREAKER CASE. SPRINGS CAUSE INTERNAL
PARTS TO MOVE QUICKLY AND WITH FORCE. CON-
TACT WITH MOVING PARTS CAN CAUSE INJURY.
2-7. Perform a mechanical check of the LEST after
installation.
a. With circuit breaker still electrically isolated,
reset the circuit breaker.
b. Hold LEST plug-in module firmly in position in
the base. Reset circuit breaker handle. Check
that LEST reset lever pushes plunger into sole-
noid and that plunger is held by magnet.
Square LEST
Opening Plug-in
Moduie
Replacement
Interphase
Barrier
Fig. 2-6. LEST and Interphase Barrier Installation
(Thermal magnet circuit breakers only)
E-T-N
Effective November 1998
LL. 29C141C Page 5
Ш À caution
a -—— Plug-in
Module
WHEN INSTALLING THE CIRCUIT BREAKER COVER,
MAKE SURE THAT ALL INTERNAL PARTS ARE IN
PLACE:
e ARC EXTINGUISHERS ARE IN EACH ARC EXTIN-
GUISHER CAVITY.
e INTERPHASE BARRIER IS FULLY INSERTED IN
BASE.
e SLIDING HANDLE BARRIER IS CORRECTLY
| INSTALLED WITH O ON BARRIER OVER ARC
reed EXTINGUISHER.
Position
Molded
Crossbar tn
Tripped Position
e GUIDE PUSH-TO-TRIP BUTTON THROUGH HOLE
IN COVER USING SMALL SCREWDRIVER.
Fig. 2-7. Correct Position for Trip Lever and Trip Bar e COVER BAFFLE(S) IS IN PLACE IN COVER.
e PIGTAIL LEADS ARE IN BASE SLOTS AND CLEAR
A CAUTION OF THE COVER.
THE SOLENOID PLUNGER IS HELD IN THE SEATED Solenoid
POSITION BY A PERMANENT MAGNET. LIGHT Plunger
PRESSURE, NOT TO EXCEED TWO POUNDS,
SHOULD BE USED TO MOVE PLUNGER FROM THE
SEATED POSITION.
с. Position a small flat-blade screwdriver (Fig. 2-8)
under the head of the solenoid plunger. Pry the
plunger free from the seated position inside the
solenoid and check that circuit breaker trips.
4
d. Reset circuit breaker handle and check that
handle arm moves the reset lever, and that
solenoid plunger is pushed into solenoid and
held by magnet.
D Pi TE ee A A EN Te
C——
e. If mechanical check does not work, make sure
LEST is correctly installed. If LEST appears to |
be correctly installed and problem persists, Fig. 2-8. Testing Operation of Solenoid Plunger
contact Cutler-Hammer.
2-8. With circuit breaker handle in the OFF position and
pigtail leads (if used) routed as required, install
cover and eight cover screws.
2-9. When LEST is installed at an non-UL approved
location remove and discard UL listing label.
Effective November 1998 E:T-N
Page 6
I.L. 2961416
Note: When installing LEST in 2-pole circuit breakers
or circuit breakers with cover mounted accessories,
select the alternate label mounting positions on side
of circuit breaker.
2-10. Place labels supplied with kit on circuit breaker.
(See Fig. 2-9.)
À caution
SOLENOID IS RATED FOR INTERMITTENT DUTY.
CONTINUOUS APPLICATION OF VOLTAGE WILL
DAMAGE THE SOLENOID.
Accessory
Modification Label identification
{For Factory Installed
Accessory Only) Terminal Block
a (When Used)
Pigtail Lead
Connection Diagram
Terminal | When Used)
Block
Connection Diagram
Label
(When Used)
Pigtail Leads pre 2
|
pa Г
|
|
|
Overcurrent оч “> >>“ 4
Control Protection |
Voltage Device
Source (Customer
Customer Supplied
Remote Signal
Contact and
Indication (As
Required}
Overcurrent
Protection Device
(Supplied By
Customer)
When Required
Fig. 2-9. Preferred Mounting Locations for Accessory
Nameplate Labels
Fig. 2-10. Low Energy Shunt Trip Connection Diagram
9-11. Electrical check. Where practical and after taking all
necessary safety precautions, connect yellow LEST
lead to positive terminal of a DC power supply and
white lead to ground. Reset and close circuit
breaker. Confirm that circuit breaker trips when 24
Vdc (maximum pulse of one second) is applied to
leads.
2-12. Install circuit breaker.
Note: Accessory labels show connection diagram for
LEST contacts. Pigtail leads are color coded yellow
and white.
9-13. Connect LEST to ground fault detection circuit to be
monitored. (See Fig. 2-10.) Yellow lead is positive.
Cutler-Hammer assumes no responsibility for malfunc-
tioning accessories installed by the customer.
E:T-N
Effective November 1998
">
