Definition
NO (Normally Open) - This is a contact which remains open (as default) until activated, during the "active" state the contact provides a closed circuit and starts conducting.
NC (Normally Closed) - Is the opposite of a NO contact. The contact will remain closed (as default) until activated, during the "active" state the circuit breaks and stops current flow.
For operation with a door access control panel and lock, the exit button is wired with NC or NO.
It also has a built in LED which requires 12V DC (not supplied with the product).
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