Concealed Reed (N/C) Switch & Magnet
We can get 1181 units in Australia from Jaycar. If you order today, we can dispatch this stock between Dec 08, 2020 - Dec 13, 2020.
Contacts are closed cicuit 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.