What is Reed Switch?

What is Reed Switch?

How does a Reed Switch work?

Reed switches are very similar to relays, except a permanent magnet is used instead of a wire coil. When the magnet is far away the switch is open, but when the magnet is brought near the switch is closed.

reed switch working

Reed Switch Working principle

These are very inexpensive.

With this device the magnet is moved towards the reed switch. As it gets closer the switch will close. This allows proximity detection without contact, but requires that a separate magnet be attached to a moving part.

reed switch photo

Reed Switch

 

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