The SS209-8-BG is a reed switch manufactured by Selco. It is a magnetically actuated switch with a 32Vac/32Vdc DC maximum working voltage. It has a rated load of 0.5A, a 20 mm gap distance, and a 1.6 mm body diameter. This switch is Single Pole Double Throw (SPDT), meaning it has one common terminal, as well as two normally open contacts and one normally closed contact. The SS209-8-BG is a normally open type of switch, meaning that it is open when there is no magnetic field, and closes with the presence of one. This makes it suitable for a wide range of applications. It is available in both through-hole and surface-mount packages.