Which device protects the load bank control circuits by disconnecting the power supply if faults are detected?

Which device protects the load bank control circuits by disconnecting the power supply if faults are detected?

• A. Control Power Circuit Breaker
• B. Overload Relay
• C. Ground Fault Monitor
• D. Start Button

Answer: (A)

Protecting the control power supply and disconnecting it when faults are detected is the job of the control power circuit breaker. This device sits in the control voltage path and trips to remove power to the control circuits (relays, timers, indicators, etc.) whenever an fault condition such as overcurrent or abnormal voltage is detected. By isolating the control power, it prevents damage to control devices and reduces safety risks. The other devices serve different roles: an overload relay protects the main load path rather than the control circuit; a ground fault monitor detects leakage to ground but isn’t the primary disconnect for the control power; and a start button simply initiates the control sequence.

Protecting the control power supply and disconnecting it when faults are detected is the job of the control power circuit breaker. This device sits in the control voltage path and trips to remove power to the control circuits (relays, timers, indicators, etc.) whenever an fault condition such as overcurrent or abnormal voltage is detected. By isolating the control power, it prevents damage to control devices and reduces safety risks. The other devices serve different roles: an overload relay protects the main load path rather than the control circuit; a ground fault monitor detects leakage to ground but isn’t the primary disconnect for the control power; and a start button simply initiates the control sequence.