Security Alarm Reed Switch - Closed Standard

These are used to secure an alarm circuit on a door or window. Sold as a pair, one has a magnet inside, the other a reed switch. They have powerful magnets, with self adhesive or screw mount, and screw terminal connections. Reed Switch contacts: closed when both units are together (ie current flows), and open when apart. Normally CLOSED (NC) per pair. Dimension details : Dimensions identical on switch and magnet Width : 55mm Height : 12.5mm Depth : 13mm Mounting Method : Surface Attachment / Securing Method : Screw DownSelf Adhesive Tape/Pad Overall Screw Spacing (H) : 44.5mm Packaged Volume : 0.15l Packaged Weight : 0.02kg Packaged Length : 8.4cm Packaged Width : 1.5cm Packaged Height : 12cm