table, th, td {border: 1px solid #ddd;border-collapse: collapse;}table {width: 100%; }td {width: 50%; padding: 8px;} tr:nth-child(even){background-color: #f2f2f2;} 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. Contact operation: 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. Specifications: Width 55mm Height 12.5mm Depth 13mm Dimension details Dimensions identical on switch and magnet Mounting Method Surface Attachment / Securing Method Screw Down,Self Adhesive Tape/Pad Overall Screw Spacing (H) 44.5mm
