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UM582127000 User Instructions
Issue AC, January 2, 2013 Spec. No. 582127000 (Model 721NPBB)
Page 32 Chapter 4. Troubleshooting and Repair
This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy
Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
Replacing a GJ/218 Circuit Breaker
Procedure
Note: Refer to Figure 4-6 as this procedure is performed.
1) Open the distribution cabinet’s front door by turning the latch in the
counterclockwise position.
2) Operate the defective circuit breaker to the OFF position.
Danger: The bolts being removed in the following step may be at system
potential. Use insulated tools.
3) Remove the hardware securing the circuit breaker to the distribution panel and
partially remove the circuit breaker.
4) Record each alarm wire located on the back of the circuit breaker (color and
location on circuit breaker). Wiring diagrams are provided in Figure 4-6, Figure
4-7, and Figure 4-8. Carefully disconnect the alarm wiring from the back of the
circuit breaker, ensuring the exposed end does not contact any energized circuit.
5) Shunted Breakers Only: Record each shunt wire located on the back of the
circuit breaker (color and location on circuit breaker). Wiring diagrams are
provided in Figure 4-6, Figure 4-7, and Figure 4-8. Carefully disconnect the
shunt wiring from the back of the circuit breaker, ensuring the exposed end does
not contact any energized circuit.
6) Ensure that the replacement circuit breaker is in the OFF position, and is of the
correct rating and type (electrical trip/mechanical trip or electrical trip only).
Orient the circuit breaker over its mounting location. Re-attach the alarm wiring
and shunt wiring (if applicable) to the back of the circuit breaker as recorded
above. Wiring diagrams are provided in Figure 4-6, Figure 4-7, and Figure 4-8.
Danger: The bolts being installed in the following step may be at system
potential. Use insulated tools.
7) Install the replacement circuit breaker into its mounting position and secure with
the hardware previously removed. Torque to 60 in-lbs.
8) Transfer the circuit breaker guard from the old circuit breaker to the new circuit
breaker.
9) Operate the replacement circuit breaker to the ON position.
10) Verify no Circuit Breaker Alarms are active.
11) Close the distribution cabinet’s front door. Turn the latch clockwise to secure the
door.