A thermal-magnetic molded case circuit breaker for a 300 kW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will MOST likely trip the breaker?

Question

Accepted Answer

Instantaneous current draw of 10,000 amperes for .03 seconds.

Answer

Sustained current draw of 450 amperes indefinitely.

Answer

Sustained current draw of 500 amperes for 3 hours.

Answer

Momentary current draw of 1000 amperes for 3 seconds.

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