True or False: In overload relays, contacts open under normal conditions and close when the relay trips.

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Prepare for the NCCER Electrical Level 2 Control Systems and Fundamental Concepts exam. Utilize flashcards and multiple choice questions with hints and explanations. Ensure success on your exam!

Multiple Choice

True or False: In overload relays, contacts open under normal conditions and close when the relay trips.

Explanation:
The idea being tested is how overload relays protect a motor circuit. In normal operation, the protective contacts are closed so the motor can run. When an overload is detected, the relay trips and the contacts open, which drops the motor out of the circuit and stops it. So the statement that the contacts open under normal conditions and close when the relay trips is opposite of how overload protection is wired. The correct understanding is that contacts are normally closed and open on a trip.

The idea being tested is how overload relays protect a motor circuit. In normal operation, the protective contacts are closed so the motor can run. When an overload is detected, the relay trips and the contacts open, which drops the motor out of the circuit and stops it. So the statement that the contacts open under normal conditions and close when the relay trips is opposite of how overload protection is wired. The correct understanding is that contacts are normally closed and open on a trip.

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