Which statement is true about a normally closed pushbutton?

• A. It is the same as normally open
• B. It is closed when not actuated and opens when pressed
• C. It is no longer used in modern control circuits
• D. It indicates a valve position

Answer: (B)

Normally closed means the contact conducts when nothing is actuated. A normally closed pushbutton has its contacts closed in the resting state, so current flows, and pressing the button opens the contacts to break the circuit. This is the opposite of a normally open pushbutton, which is open at rest and closes when pressed. The other statements don’t fit because a pushbutton is not the same as a normally open device, it’s still used in modern control circuits (often for safety or default-on logic), and it doesn’t indicate valve position—valve position is shown by position indicators or limit switches, not by a pushbutton.