This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch...
PS-908 M � Size : 55mm X 13mm X 12.5mm � Surface Mount Type with side Flanges � Available in 10W, 24V, 0.4A and 50W, 240V AC/DC, 0.2A Contact Rating � Operate Distance: 18mm Min....