What do NO and NC indicate in pushbutton contacts?

• A. NO means contact opens on actuation; NC means contact closes on actuation; momentary returns to its original state; maintained remains actuated.
• B. NO means contact closes on actuation; NC means contact opens on actuation; momentary stays engaged after actuation.
• C. NO means contact closes on actuation; NC means contact opens on actuation; momentary returns to original state; maintained remains actuated.
• D. NO stands for non-operational; NC stands for normally closed with no operation.

Answer: (C)