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General

What is Normally Open?

Definition

A switch or relay contact that is open (non-conducting) in its default unpowered state and closes when activated. Normally open contacts are used for run commands, start buttons, and enabling functions in control circuits.

Related Terms

Normally Closed

A switch or relay contact that is closed (conducting) in its default unpowered s...

Contactor

An electrically controlled switch used to make or break power circuits in indust...

Run Command

The control signal or digital input that commands a drive to start the motor and...

Browse all General terms (92)
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