21st October 2019

stackexchange
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What is normally open and normally closed?

NO is normally open i.e. the contacts are normally open and close when the switch is actuated. NC is normally closed i.e. the contacts are normally closed and open when the switch is actuated. 1NO1NC is generally used to describe contactors (industrial power relays) and manual switches like emergency stop buttons.

What is the difference between a normally open and normally closed?

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).
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