21st October 2019

sparkfun
15

What does normally closed and normally open mean?

Normally Open/Closed. When a momentary switch is not actuated, it's in a “normal” state. Depending on how the button is constructed, its normal state can be either an open circuit or a short circuit. When a button is open until actuated, it's said to be normally open (abbreviated NO).

Also asked, what does it mean when a relay is normally open?

An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. Each contact is a piece of electrically conductive material, usually metal. When the contacts touch, the switch is "closed"; when the contacts are separated, the switch is "open".

Are relays normally open or closed?

Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.

What is a normally open circuit?

An "open" circuit is an incomplete circuit, with "open space" between contacts. Therefore a normally open circuit can also be referred to as "normally OFF". A normally closed or N.C. momentary switch has one or more circuits that are closed when the switch actuator is at its normal or rest position.
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