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

Explanation:
Overload protection in motor circuits uses contacts that are normally closed. In normal operation the protective path is complete, keeping the control circuit energized so the motor runs. When an overload occurs, the thermal element trips and these contacts open, breaking the circuit and stopping the motor. So the idea that the contacts open only when normal conditions exist and close only on a trip is not correct. (Note: some overload relays provide separate normally open auxiliary contacts for signaling, but the protective path relies on normally closed contacts that open on trip.)

Overload protection in motor circuits uses contacts that are normally closed. In normal operation the protective path is complete, keeping the control circuit energized so the motor runs. When an overload occurs, the thermal element trips and these contacts open, breaking the circuit and stopping the motor. So the idea that the contacts open only when normal conditions exist and close only on a trip is not correct. (Note: some overload relays provide separate normally open auxiliary contacts for signaling, but the protective path relies on normally closed contacts that open on trip.)

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