Section 14—Circuit Breaker and Fusible Switch Replacement

NOTE: On Closed Door Racking (CDR) Units, Schneider Electric does not recommend field replacement of the circuit breaker by the customer due to the complexity of the CDR unit construction. Please contact Schneider Electric Services to replace the circuit breaker in a CDR unit.

For 100/200 A fusible switches, Schneider Electric recommends replacing the entire disconnect assembly. The disconnect assembly includes the operator mechanism and the appropriate switch.

Replacing the entire disconnect assembly requires the removal of three screws (two from the left side of the assembly and one inside the back of the assembly). This procedure is much simpler and quicker than replacing an individual circuit breaker or switch.

See Schneider Electric bulletin Disconnect Assembly Replacement (80439-666-01) for disconnect assembly installation instructions.

DANGER
Hazard of Electric Shock, Explosion, or Arc Flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors, and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

Hazard of Electric Shock, Explosion, or Arc Flash

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
This equipment must only be installed and serviced by qualified electrical personnel.
Turn off all power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Replace all devices, doors, and covers before turning on power to this equipment.

Failure to follow these instructions will result in death or serious injury.

For PowerPacT™ H-, J-, and B-frame and TeSys BV4 circuit breakers, order a replacement circuit breaker only. The following instructions use the PowerPact H-Frame circuit breaker for illustration. Other breaker frames noted have similar replacement procedures. To replace the circuit breaker:

Turn off all power supplying this equipment before working on or inside the equipment, and follow lockout/tagout procedures. Always use a properly rated voltage sensing device to confirm power is off.
Remove the control unit from the MCC. See Removing the Control Unit.
Open the line insulator tabs.
Loosen the set screws in the line and load side lugs. Detach the line and load side wires.
Remove circuit breaker mounting screws (see Circuit Breaker Replacement).
Remove the circuit breaker from the unit.
Remove the phase insulators from the breaker (see Circuit Breaker Replacement).

NOTE: Step 7 does not apply to PowerPacT B-frame and TeSys BV4 circuit breakers.
Unpack the new circuit breaker.
Reinstall the circuit breaker phase insulators in the slots provided on the circuit breaker.

NOTE: Step 9 does not apply to PowerPacT B-frame and TeSys BV4 circuit breakers.
Place the circuit breaker in the mounting pan, making sure that the line insulator is in position under the circuit breaker. Secure the circuit breaker with the two mounting screws provided.
Insert the line and load wires into the circuit breaker lugs. Tighten the lug set screws to the torque value indicated on the circuit breaker.
Close the line insulator tabs.
Reinstall the control unit in the MCC. Close and fasten the door.

Circuit Breaker Replacement

Always use replacement devices of the same type and rating as the device being removed. Using a different type of disconnect or one with a different rating may alter the short circuit ratings of the motor control center.

Contact the MCC Technical Assistance Group (TAG) before installing a circuit breaker with a different rating. See Appendix D—Technical Support for the MCC TAG technical support number.