Question

Power-circuit breakers are intended for service in the ac circuit above _____ V.

Short answer

Power-circuit breakers are intended for service in the ac circuit above 1500 V .

Step-by-step solution

Classification of AC circuit breaker.

On the bases of the service the AC circuit breaker are classified into two types.

(1) Low voltage circuit breaker:

The circuit breaker that are used to protect the circuit up to 1500 V are known as low voltage circuit breaker.

(2) High voltage circuit breaker.

The circuit breaker that are used to protect the circuit above 1500 V are known as high voltage circuit breaker.

Determine the circuit breaker are intended for service in the ac circuit.

According to the classification of the circuit breaker, high voltage circuit breaker provides the protect against fault current or over current above 1500 V .

Therefore,Power-circuit breakers are intended for service in the ac circuit above 1500 V .