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 opens. This makes for a great non-comore...
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.more...