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 relies on a thermal element that responds to excess current by opening the circuit to stop the motor. In normal operation, the contacts that carry the motor current are closed, allowing power to flow. When the motor overheats, the element trips and the contacts open, interrupting power and causing the motor to stop. Because of this, standard overload relay contacts do not open under normal conditions and close when the relay trips; the opposite is true. Some overload relays include auxiliary contacts that signal a trip, but the main power-carrying contacts are normally closed and open on trip.

Overload protection relies on a thermal element that responds to excess current by opening the circuit to stop the motor. In normal operation, the contacts that carry the motor current are closed, allowing power to flow. When the motor overheats, the element trips and the contacts open, interrupting power and causing the motor to stop. Because of this, standard overload relay contacts do not open under normal conditions and close when the relay trips; the opposite is true. Some overload relays include auxiliary contacts that signal a trip, but the main power-carrying contacts are normally closed and open on trip.

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