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This sensor is essentially a reed switch, encased in a plastic shell. Normally the reed switch is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes. They're often used to detect when a door  is open, which is why they have mounting tabs and screws.

  • Normally open reed switch & magnet.

  • ABS enclosure for reed switch & magnet

  • Rated current: 100 mA max

  • Rated voltage: 200 VDC max

  • Distance: 15mm max

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