In switch terminology, a normally closed contact means what when the actuating condition is not present?

In switch terminology, a normally closed contact means what when the actuating condition is not present?

• A. It opens
• B. It remains closed
• C. It floats
• D. It shorts to ground

Answer: (B)

Normally closed means the contact is conducting in its default, unactuated state. When the actuating condition is not present, the spring or mechanism holds the contact closed, so current can flow. Only when you apply the actuation does the contact open and interrupt the circuit. So, in this scenario, the contact remains closed. The other possibilities don’t match the definition: it doesn’t open on its own in the unactuated state, it isn’t left floating, and it isn’t inherently shorting to ground unless the wiring creates such a path.

Normally closed means the contact is conducting in its default, unactuated state. When the actuating condition is not present, the spring or mechanism holds the contact closed, so current can flow. Only when you apply the actuation does the contact open and interrupt the circuit. So, in this scenario, the contact remains closed. The other possibilities don’t match the definition: it doesn’t open on its own in the unactuated state, it isn’t left floating, and it isn’t inherently shorting to ground unless the wiring creates such a path.