Description

Alarm Bell Normally Open/Closed Switch

Normally closed – Is a contact that flows current in its normal state. Energizing it and switching it on will open the contact, causing it to not allow current flow.

Normally open – Is a contact that does not flow current in its normal state. Energizing it and switching it on will close the contact, causing it to allow current flow. Normally closed – Is a contact that flows current in its normal state.