Normally open (NO) contacts are defined as:

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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

Normally open (NO) contacts are defined as:

Explanation:
Normally open contacts are open when the control coil is not energized and they close when the coil is actuated. In a relay (especially a latching type with an unlatch or reset coil), energizing the unlatch coil returns the mechanism to its resting, de-energized state. In that resting state, the normally open contacts are not conducting — they are disengaged. So the NO contacts are the ones that disengage after the unlatch coil is energized. The other descriptions would imply closure or energization in that unlatch action, which isn’t how normally open contacts behave in this configuration.

Normally open contacts are open when the control coil is not energized and they close when the coil is actuated. In a relay (especially a latching type with an unlatch or reset coil), energizing the unlatch coil returns the mechanism to its resting, de-energized state. In that resting state, the normally open contacts are not conducting — they are disengaged. So the NO contacts are the ones that disengage after the unlatch coil is energized. The other descriptions would imply closure or energization in that unlatch action, which isn’t how normally open contacts behave in this configuration.

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