Q1: A magnetic circuit breaker will open to protect equipment only when:

A current is exceeded

B voltage is exceeded

C the equipment is operating properly

D an open is in the equipment

ANS:D - current is exceeded

Magnetic circuit breakers use a solenoid (electromagnet) whose pulling force increases with the current. Certain designs utilize electromagnetic forces in addition to those of the solenoid. The circuit breaker contacts are held closed by a latch. As the current in the solenoid increases beyond the rating of the circuit breaker, the solenoid's pull releases the latch, which lets the contacts open by spring action.

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