The reed switch is an electrical switch operated by an applied magnetic field. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope.
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There are two types of reed switches: "normally open" reed switches and "normally closed" reed switches. The metal reeds on a normally open switch stay open when there is no magnet near the switch. In the presence of a magnetic field, the contacts of a normally-open reed switch will close. A normally-closed reed switch is closed when it is not near a magnet; as a magnet is brought close to it, a normally-closed switch will open.
Switch pattern: N/O normally open
Mounting method: SMD (by screws or double-sided tapes)
Contact capacity: Maximum switch current: 0.5Amp
Voltage: 100 VDC
Wire lead: 22 Awg, 300mm long