What is interrupting time of a circuit breaker?

Q.  The interrupting time of a circuit breaker is the period between the instant of _________.
- Published on 17 Nov 15

a. Initiation of short circuit and the arc extinction on an opening operation.
b. Energizing the trip circuit and the arc extension on an opening operation.
c. Initiation of short circuit and the parting of primary arc contacts.
d. Energizing of the trip circuit and the parting of primary arc contacts.

ANSWER: Energizing the trip circuit and the arc extension on an opening operation.

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