What are Normally Open and Normally Closed Contacts? - Switch Smart

Опубликовано: 11 Июль 2026
на канале: E-Switch, Inc
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What are Normally Open and Normally Closed Contacts? Normally closed (NC) and normally open (NO) contacts are terms used in the context of electrical switches and relays, but what’s the difference between a normally closed vs normally open switch? These terms describe the default state of a contact in a switch or relay when no external force or input is applied.

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