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

Question

Accepted Answer

Instantaneous current draw of 5,000 amperes

Answer

Sustained current draw of 450 amperes for 2 hours

Answer

Sustained current draw of 500 amperes for 10 minutes

Answer

Momentary current draw of 1000 amperes for 3 seconds

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