Marine Electrical Systems USCG Question #331 (Set 12)

When the operating handle of a molded-case circuit breaker is in the mid-position, what is the indication for the position of the circuit breaker?

Official USCG Answer & Rule Citation

Correct Answer: Option A — in the 'tripped' position

Molded-case circuit breakers indicate a fault trip by resting in an intermediate position between ON and OFF. Operators must manually push the handle past the OFF position to reset the internal latching mechanism before closing the breaker again, per IEEE 45 and 46 CFR standards.

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