________ circuits use auxiliary devices that direct the operation of the CB.

• A. Control
• B. Power
• C. Protection
• D. Pilot

Answer: (A)

Control circuits use auxiliary devices to direct the operation of the circuit breaker by routing the signals and power that trip or close the breaker. These devices—relays, interlocks, pushbuttons, and coils—are not part of the main current path, but control how the breaker operates based on operator input or protection logic. Pilot circuits, while involved in signaling and coordination within protection schemes, serve to transmit trip signals rather than directly govern the breaker's action in everyday operation. Protection circuits monitor for faults and initiate actions through those same control elements, but the thing that directly directs the breaker’s action using auxiliary components is the control circuit.