A Normally Closed (NC) Push Button is a push button that, in its default state, makes electrical contact with the circuit. When the button is pressed down, the switch no longer makes electrical contact and the circuit is now open.
Then, how do push button switches work?
Construction. A push button switch is a small, sealed mechanism that completes an electric circuit when you press on it. When it's on, a small metal spring inside makes contact with two wires, allowing electricity to flow.
What is the difference between normally open and normally closed switch?
Resolution: In a push button type switch (RX or LX), in which the contacts remain in one state unless actuated, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c. or "nc") and opened by the switch action.
What is the purpose of push button?
A push-button (also spelled pushbutton) or simply button is a simple switch mechanism for controlling some aspect of a machine or a process. Buttons are typically made out of hard material, usually plastic or metal.