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Reed Switch Tutorial

Basically, the reed switch consists of two springy metal strips (reeds) sealed in a glass tube, filled with an inert gas which prevents corrosion.

Electronic Reed Switch Diagram

The switch is activated by an external magnetic field.

This field can be provided by bringing a permanent magnet close to the switch, or by passing current through a coil which is wrapped around the switch.

It can be used as part of an intruder detection system, with a magnet fixed to a door and the switch fitted to the door frame.

It can also be used as a high speed relay. Reed relays require much lower operating current than normal relays.

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