Security Alarm Reed Switch - Double Throw

BNR

Contacts are closed circuit when the magnet is alongside the switch. For alarm installation this is denoted as the "normal" state as the door/window is secure and the alarm is armed.

You have both types of contacts on the one unit, so you will always have the correct one!
Normally Open (N.O.) and Normally Closed (N.C.) per pair.

Operating Temperature : -40.000000°C
Dimension details : Dimensions identical on switch and magnet
Width : 55.00000000mm
Height : 12.50000000mm
Depth : 13.00000000mm
Mounting Method : Surface
Attachment / Securing Method : Screw Down, Self Adhesive Tape/Pad