Rockwell Automation Allen-Bradley 140U Series Installation Instructions
Rockwell Automation Allen-Bradley 140U Series circuit breakers and molded case switches offer reliable protection for electrical systems with current ratings from 15A to 225A. These devices are suitable for various applications, including industrial machinery, commercial buildings, and residential settings. The 140U Series is designed for easy installation and features a variety of accessories to customize the circuit protection to specific needs.
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includes molded case switches.
Bul. 140U
Installation Instructions
for
I-Frame Molded Case
Circuit
Breakers and Molded Case Switches
WARNING
DO NOT
ATTEMPT
TO
INSTALL
OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS ENER-
GIZED. 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.
The 140U-I-Frame circuit breakers (Fig. 1-1) are rated from 15A to 225A continuous current and are available as thermal-magnetic
circuit breakers and molded case switches.
Circuit breakers are listed in accordance with
Underwriters Laboratories, Inc. Standard UL489, and satisfy the (P1) requirements of the
International Electrotechnical Commission
Recommendation No. IEC 157-1. Molded case
switches are listed in accordance with UL1087.
For this publication, the term circuit breaker also
2. INSTALLATION
ALLEN-BRADLEY IS NOT LIABLE FOR THE
MISAPPLICATION OR MISINSTALLATION OF ITS
PRODUCTS.
The installation procedure consists of inspecting
and
.
mounting the circuit breaker, connecting and torquing the line and load terminations, and attaching terminal shields or barriers, when supplied. To install the circuit breaker, perform the following steps:
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
Allen-Bradley 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 Allen-Bradley for further information
or
instructions.
Note:
The I-Frame circuit breakers are factory sealed. UL489 requires that internal accessories be installed at the factory. Where local codes and standards permit and
UL listing is not required, internal accessories can be field installed. Accessory installation should be done before the circuit breaker is mounted and connected.
Mounting hardware and unmounted terminations (where required) are supplied in separate packages.
1, INTRODUCTION
2-1. Make sure that the circuit breaker is suitable for the installation by comparing nameplate data with system requirements. Inspect the circuit breaker for completeness and check for damage before mounting.
B EFORE MOUNTING THE CIRCUIT BREAKER IN AN
ELECTRICAL SYSTEM, MAKE SURE THERE IS NO
VOLTAGE PRESENT WHERE WORK IS TO BE PER-
FORMED. THE VOLTAGES IN ENERGIZED EQUIP-
MENT CAN CAUSE INJURY OR DEATH.
Fig, 7-1.
I-Frame and
Molded Case
Switches
40752-162(1) Effective 7/07
2-2. 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.
Note:
Before mounting the circuit breaker, check if the termination devices should be installed first. See termi- nations instructions.
2-3. To mount the circuit breaker, perform the following steps: a. For individual mounting panels, make sure that mounting panel is predrilled using bolt drilling plan
(Fig. 2-1). For deadfront cover applications
make sure panel cover is cut out to correct escutcheon dimensions (Fig.
2-2) ).
I
T
2913
158.751
'
,188 (478 mm) Dia. Hde for
Access to Push-to-Trip
Fig. 2-2. Circuit Breaker Escutcheon Dimensions
2-4. If an optional terminal end cover is to be installed with the circuit breaker (usually line end only), it must be positioned before cable is connected to terminals. b. If circuit breaker includes factory installed internal accessories, make sure accessory wiring can be reached when the circuit breaker is mounted. c. Position circuit breaker on mounting surface. d. Install mounting screws, washers, and nuts. Tighten screws firmly, but do not exceed 28 pound-inches
(3.16
N.m.).
N.m.).
4 Poles
.164-32Tap Holes
(M4 x .07)
Fig,
2-1. Circuit Breaker Mounting Bolt Drilling Plans
CAUTION
WHEN ALUMINUM CONDUCTORS ARE USED, THE
APPLICATION OF A SUITABLE JOINT COMPOUND IS
RECOMMENDED TO REDUCE THE POSSIBILITY OF
TERMINAL OVERHEATING. TERMINAL OVERHEATING
CAN CAUSE NUISANCE TRIPPING AND DAMAGE TO
THE CIRCUIT BREAKER .
2-5. After mounting the circuit breaker, line and load terminals and accessory leads should be connected.
(See accessory schematic diagram on side of circuit breaker. )
Note: If terminal shield or interphase barriers are to be installed on the circuit breaker, install them after the terminals
are
connected.
2-6. If required, install terminal shield on circuit breaker cover with mounting screws provided.
2-7. If required, install an interphase barrier by sliding barrier into dovetail grooves between terminals.
2-8. After the circuit breaker is installed, check all mounting hardware and terminal connecting hardware for correct torque loading. Torque values for line/load terminals are given in Tables 2-1 and 2-2 and on the circuit breaker nameplate.
40752-162(1) Effective 7/07
Page 3
Note: In the event of a thermal trip, the circuit breaker cannot be reset until the thermal element cools.
PUSH-TO-TRIP BUTTON
The PUSH-TO-TRIP button checks the tripping function and is used to periodically exercise the operating mechanism.
4. INSPECTION AND FIELD TESTING
140U molded case circuit breakers are designed to provide years of almost maintenance-free operation. The following procedure describes how to inspect and test a circuit breaker in sewice.
INSPECTION
Circuit breakers i
n service
should be
Inspected periodi-
cally. The inspection should include the following checks
4-1 thru4-7.
Handle Positon lrdiator Galor:
~~
BEFORE INSPECTING THE CIRCUIT BREAKER 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 TO
ENSURE NO VOLTAGE IS PRESENT.
THE VOLTAGES
IN ENERGIZED EQUIPMENT CAN CAUSE INJURY OR
DEATH.
A
CAUTION
Fig. 3- I . Circuit Breaker
Manual Controls
3. MANUAL OPERATION
Manual operation of the circuit breaker is controlled by the circuit breaker handle and the PUSH-TO-TRIP button. The circuit broaker handle has three indicated positions, two of which are shown on the cwer with raised lettering to indicate ON and OFF. On the sliding handle barrier, ON, OFF, and trip are also shown by a color-coded strip for each circuit breaker handle position: red for ON, white for tripped, and green for OFF. On the sliding handle barrier, ON/OFF is also shown with the international symbols 1/0
(See
Fig. 3-1 .)
CIRCUIT BREAKER RESET
After tripping, the circuit breaker is reset
by moving
the circuit breaker handle to the extreme OFF position.
MAKE SURE THAT CLEANING AGENTS OR SOL-
VENTS USED TO CLEAN THE CIRCUIT BREAKER ARE
SUITABLE FOR THE JOB. SOME COMMERCIAL
CLEANING AGENTS WILL DAMAGE THE NAME-
PLATES OR MOLDED PARTS.
4-1. Remove dust, dirt, soot, grease, or moisture from the surface
of
the circuit breaker using
a
lint-free dry cloth, brush, or vacuum cleaner. Do
not
blow debris into circuit breaker. If contamination is
found,
look for the
source
and eliminate the problem.
4-2. Switch circuit breaker to ON and OFF several times to be sure that the mechanical linkages are free and do not bind. If mechanical linkages are not free, replace circuit breaker.
40752-162(1) Effective 7/07
Page 4 trip the circuit breaker. Trip, reset, and switch circuit breaker ON several times. If mechanism does not reset each time the circuit breaker is tripped, replace the circuit breaker.
4 4 . Check base, cover, and operating handle
for cracks,
chipping, and discoloration. Circuit breakers should be replaced if cracks or severe discoloration is found.
4-5. Check terminals and connectors for looseness or
signs of
overheating. Overheating will
show as
discolora- tion, melting, or blistering
of
conductor insulation,
or as
pitting
or
melting of conductor surfaces due to arcing. If there is no evidence
of
overheating
or
looseness, do not disturb
or
tighten the connections. If there is evidence of overheating, terminations should be cleaned or replaced.
Before re-energizing the circuit breaker, all terminations and cable should be refurbished to the condition when originally installed.
4-6. Check circuit breaker mounting hardware. Tighten if necessary. safety hazards, including personal safety and fire hazards. Exposure to certain types of chemicals can cause deterioration of electrical connections.
FIELD TESTING
Any field testing should be done in accordance with
NEMA Standards Publication AB2
-
40752-162(1) Effective 7/07
Printed in USA

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