Normally closed (NC) contacts are defined as:

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Multiple Choice

Normally closed (NC) contacts are defined as:

Explanation:
Normally closed contacts stay closed when the control coil is de-energized and they open when the coil is energized. In other words, the current path is intact with no energizing signal, but applying power to the coil moves the contact to the open position and interrupts the circuit. This is why the standard description of a normally closed contact is that it opens when the coil is energized. The idea of the contact closing after an unlatch action relates to a specific relay’s mechanism, but the defining behavior of a normally closed contact is the transition from closed at rest to open when energized.

Normally closed contacts stay closed when the control coil is de-energized and they open when the coil is energized. In other words, the current path is intact with no energizing signal, but applying power to the coil moves the contact to the open position and interrupts the circuit. This is why the standard description of a normally closed contact is that it opens when the coil is energized. The idea of the contact closing after an unlatch action relates to a specific relay’s mechanism, but the defining behavior of a normally closed contact is the transition from closed at rest to open when energized.

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