Instruction Leaflet
IL29C149B
Effective December 2011
Supersedes IL29C149A 07/98
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
Contents
Description Page
1-0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Instruction Leaflet IL29C149B
Effective December 2011
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
CONTACT WITH ENERGIZED EQUIPMENT CAN
RESULT IN DEATH, SEVERE PERSONAL INJURY,
OR SUBSTANTIAL PROPERTY DAMAGE. DO NOT
ATTEMPT TO INSTALL OR PERFORM MAINTE-
NANCE ON EQUIPMENT WHILE IT IS ENERGIZED.
ALWAYS VERIFY THAT NO VOLTAGE IS PRESENT
BEFORE PROCEEDING WITH THE TASK, AND
ALWAYS FOLLOW GENERALLY ACCEPTED SAFE-
TY PROCEDURES.
THE EATON CORPORATION IS NOT LIABLE
FOR THE MISAPPLICATION OR MISINSTAL-
LATION OF ITS PRODUCTS.
The user is cautioned to observe all recommendations, warnings and cautions relating to the safety of personnel and equipment well as as general and local health and safety laws, codes and procedures.
The recommendations and information contained herein are based on Eaton 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 Eaton for further information or instructions.
1-0 INTRODUCTION
General Information
The low energy shunt trip (LEST) is designed to interface with a customer ground fault detection system
(Figure 1-1). The LEST consists of an intermittent rated solenoid with a plunger and a reset lever assembled to a plug-in module. The plug-in module is mounted in slots in the top of the trip unit and occupies the accessory cavity in the circuit breaker frame. 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 designed to trip the circuit breaker when a
100 microfarad capacitor charged to 28 Vdc is discharged through the solenoid.
For this publication, the term circuit breaker shall also include molded case switch and motor circuit protector.
Low Energy Shunt Trip Installed in N-Frame
Circuit Breaker.
Depending on the model ordered, connections for the
LEST 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 rear of the base on the side opposite the accessory.
The 18-inch (457.2 mm) long pigtail leads are color coded for identification; identification labels are provided for pigtail leads and terminal block points. For allowable locations of all accessories, refer to Frame Book 29-104.
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 for installing the LEST.
2 EATON CORPORATION www.eaton.com
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
Instruction Leaflet IL29C149B
Effective December 2011
2-0 INSTALLATION
The LEST can be field-installed in ND, HND, NDC and CNDC circuit breakers under UL File E64983.
The LEST can be field-installed in NW, HNW, and
NWC circuit breakers.
The LEST is listed 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 in sealed circuit breakers. In this case, UL listing becomes invalid and the label should be removed.
Before attempting to install the LEST, check that the catalog number is correct as ordered and that the rating of the accessory satisfies job requirements.
The LEST, Shown in kit form in Figure 2-1, is installed in the right or left accessory mounting cavity of a 2-, 3-, or
4-pole circuit breaker, and in the left pole only of a circuit breaker with an NS (electronic) trip unit. A LEST must be installed in the circuit breaker before the circuit breaker is mounted in an electrical system. To install the LEST, perform the following procedures:
Accessory
Identification
Nameplate
LOW ENERGY SHUNT TRIP
LST5LB
1494D49G03
28 VOLTS DC
0.45 AMPS
@ 250 MS
Connection
Label (Pigtail
Leads Shown)
Intermediate
Plunger
LEST Plug-In
Module with
Pigtail Leads
Figure 2-1 Low Energy Shunt Trip Kit.
For new circuit breaker installation, the trip unit must be installed in circuit breaker before attempting to install a LEST.
2-1.
Switch circuit breaker to OFF position.
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 surface.
WARNING
THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
BEFORE REMOVING A CIRCUIT BREAKER
INSTALLEDIN AN ELECTRICALSYSTEM, 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 PAIDTO
REVERSE FEED APPLICATIONSTO ENSURE NO
VOLTAGE IS PRESENT.
To install LEST, circuit breaker operating mechanism must be in tripped position.
Molded case switch trip units are not equipped with a Push-to-Trip button. For molded case switches, omit step 2-3.
2-2.
Disconnect and remove circuit breaker from installation and terminal connections.
2-3.
Press PUSH-TO-TRIP button to trip operating mechanism and check handle moves to trip position with white colored indicator visible in escutcheon window.
2-4.
Remove cover screws and cover.
EATON CORPORATION www.eaton.com
3
Instruction Leaflet
Effective December 2011
2-5.
2-6.
IL29C149B Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
Push intermediate plunger supplied with LEST in one hole to trip the molded case switch.
Remove plunger to prevent it falling out of recessed hole in trip unit and into molded case switch mechanism.
Remove interphase barrier between center pole and pole in which accessory is to be mounted and flip (Figure 2-2).
Install LEST as described in the following steps
(Figure 2-3):
CAUTION
IF LEST IS REMOVED FROM CIRCUIT BREAKER,
INTERMEDIATE PLUNGER MUST ALSO BE
REMOVED. FAILURE TO REMOVE THE INTERMEDI-
ATE PLUNGER CAN RESULT IN EQUIPMENT DAM-
AGE.
a. Remove barrier from trip unit accessory mounting slots in pole being used for accessory (see Figure 2-3). b. Position intermediate plunger in trip unit
(Figure 2-3).
c. Press intermediate plunger into recess in trip unit, and hold in position. Slide LEST plug-in module into slots (Figure 2-3) until retaining clip snaps into trip unit. For terminal block assemblies, slide terminal block into mounting slot on side of base as plug-in module is properly positioned.
CAUTION
LEADS SHOULD BE FORMED AND ROUTED TO
CLEAR ALL MOVING PARTS WHEN ACCESSORY IS
PROPERLY INSTALLED. PIGTAIL WIRES COULD
BE DAMAGED IF IN CONTACT WITH MOVING
PARTS.
Figure 2-2 Interphase Barrier Replacement and
Intermediate Plunger Positioning.
Installed Low
For a LEST having rear or opposite-side exiting pigtail leads, thread leads through center trough in side of base before attempting to insert the mounting bracket. Pigtail leads exiting in this manner should be eased through trough as mounting bracket is
Figure 2-3 Installing Intermediate Plunger and Shunt
Trip.
4 EATON CORPORATION www.eaton.com
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP) inserted into trip unit retaining slots. Use center trough also for leads exiting the side of the circuit breaker.
2-8.
Route wiring to meet installation requirements
(Figure 2-4). If required, complete routing of leads to opposite side through rear window trough.
Instruction Leaflet IL29C149B
Effective December 2011
CONTACT WITH MOVING PARTS CAN CAUSE PER-
SONAL INJURY. WHEN CHECKING ACCESSORY,
DO NOT PUT FINGERS NEAR MOVING PARTS
INSIDE CIRCUIT BREAKER CASE. SPRINGS
CAUSE INTERNAL PARTS TO MOVE QUICKLY AND
WITH FORCE.
Perform mechanical check of LEST after installation: a. With the circuit breaker still electrically isolated, reset the circuit breaker.
Rear Leads
CAUTION
THE SOLENOID PLUNGER IS HELD IN THE SEATED
POSITION BY A PERMANENT MAGNET. LIGHT
PRESSURE, NOT TO EXCEED TOW POUNDS,
SHOULD BE USED TO MOVE PLUNGER FROM
SEATED POSITION b. Position a small flat-blade screwdriver
(Figure 2-5) under the head of the solenoid plunger. Pry the plunger free from the seated position and check the circuit breaker trips.
c. 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. If mechanical check does not trip circuit breaker, see if LEST and intermediate plunger are correctly installed. If LEST and intermediate plunger appear to be properly installed and problem persists, contact
Eaton.
Leads
Opposite-Sde
Leads
Figure 2-4 Accessory Wiring Options.
Figure 2-5 Testing Operation of Solenoid Plunger.
EATON CORPORATION www.eaton.com
5
Instruction Leaflet IL29C149B
Effective December 2011
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
CAUTION
WHEN INSTALLING CIRCUIT BREAKER MAIN
COVER, MAKE SURE THAT ALL INTERNAL PARTS
ARE IN PLACE:
SLIDING HANDLE BARRIER IS POSITIONED SO
THAT THE HANDLE OPENING IS ALIGNED WITH
THE HANDLE.
ALL LEADS ARE CLEAR OF THE COVER
2-10.
With circuit breaker handle in TRIPPED position and accessory pigtail leads (if used) routed as required, install circuit breaker covers. Secure with pan-head screws. Torque to 22-24 Ib-in
(2.49-2.72 Nm).
2-1 Remove and discard UL listing label on NDB circuit breakers only.
2-12.
Place accessory labels (supplied with kit) on circuit breaker (See Figure 2-6).
Modification
Identification
Terminal
Block
Connection
Diagram
Label
(When Used)
Connection
Diagram
(When Used)
Figure 2-6 Preferred Mounting Locations for Accessory
Nameplate Labels
CAUTION
SOLENOID IS RATED FOR INTERMITTENT DUTY.
CONTINUOUS APPLICATION OF 24 VDC DAM-
AGE THE SOLENOID.
2-13.
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.
2-14.
Install circuit breaker.
Pigtail Leads
Overcurrent
Protection
Device
(Customer Supplied)
When Required
Terminal Block
White
Customer Supplied
Remote Signal
Contact and
Indication (As
Required)
I
I
Control
Voltage
Source
Protection
Device
(Customer Supplied)
When Required
Accessory labels show connection diagram for
LEST contacts. Pigtail leads are color coded white and yellow.
2-15.
Connect LEST to ground fault detection circuit to be monitored (Figure 2-7). Yellow lead is positive.
Figure 2-7 Low Energy Shunt Trip Connection Diagram.
Eaton assumes no responsibility for malfunctioning accessories installed improperly by the customer.
6 EATON CORPORATION www.eaton.com
Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
Notes:
Instruction Leaflet IL29C149B
Effective December 2011
EATON CORPORATION www.eaton.com
7
Instruction Leaflet
Effective December 2011
IL29C149B Installation Instructions for Low Energy Shunt Trip for NDB, ND,
NDC, HND, NW, HNW, NWC Circuit Breakers, Series C Molded
Case Switches, and Motor Circuit Protectors (HMCP)
The instructions for installation, testing, maintenance, or repair herein are provided for the use of the product in general commercial applications and may not be appropriate for use in nuclear applications . Additional instructions may be available upon specific request to replace, amend, or supplement these instructions to qualify them for use with the product in safety-related applications in a nuclear facility .
This Instruction Booklet is published solely for information purposes and should not be considered all-inclusive . If further information is required, you should consult an authorized Eaton sales representative .
The sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between the parties . This literature is not intended to and does not enlarge or add to any such contract .
The sole source governing the rights and remedies of any purchaser of this equipment is the contract between the purchaser and Eaton .
NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR
MERCHANTABILITY, OR WARRANTIES ARISING FROM COURSE
OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING
THE INFORMATION, RECOMMENDATIONS, AND DESCRIPTIONS
CONTAINED HEREIN.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or otherwise for any special, indirect, incidental or consequential damage or loss whatsoever, including but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information, recommendations and description contained herein .
Eaton Corporation
Electrical Sector
1111 Superior Ave.
Cleveland, OH 44114
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2011 Eaton Corporation
All Rights Reserved
Printed in USA
Publication No. IL29C149B / TBG000810
Part No. 6634C83H03
December 2011
Eaton is a registered trademark of Eaton
Corporation.
All other trademarks are property of their respective owners.
