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What are normally open and normally closed contacts?

Issue:
What are normally open and normally closed contacts?

Product Line:
Push buttons, contactors and starters, relays

Environment:
Products sold and used in the United States

Cause:
Selecting the correct contact type.
 
Resolution:

Normally open contacts are open when they are not actuated and close when energized.

Normally closed contacts are closed when they are not actuated and open when energized.

 
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