What Is a Magnetic Switch?

A bit of judiciously applied solder is helpful when making a magnetic switch.
••• soldering image by Bube from Fotolia.com

A magnetic switch is just like a light switch: it turns a circuit on or off depending on what position the arm of the switch is in. The only difference is that a magnetic switch is operated by a magnet, rather than your fingers.


A magnetic switch has an arm of conductive metal that is fixed on one end, two switch contacts that are near the free end of the arm, and a movable magnet. Some also have two magnetic clamps.


There are three types of magnetic switch. Normally open monostable switches remain connected only when the movable magnet is near the arm. Normally closed monostable switches remain disconnected only when the magnet is near the arm. Bistable switches change position from open to closed whenever the magnet moves, but remain in their last position even when the magnet moves away.

How They Work

When the movable magnet comes close enough to the free end of the arm it attracts the metal arm to it. This brings the end of the arm into contact with (or away from contact with) the switch contacts. Bistable switches have magnetic clamps that hold the arm in place after the magnet moves.

Related Articles

Why Are Magnets Used in Recycling?
How to Build an Electromagnet
How Does a Latching Relay Work?
Parts of a Motor
How to Build a Super Magnet
What Is an Electric Relay?
The Uses of Different Shaped Magnets
How Does a Solenoid Work?
How to Magnetize an Iron Rod
What Types of Metal are Attracted to Magnets?
How to Make a Negative Charge Magnet
How to Make Stainless Steel Magnetic
How Does Heat Affect Magnets?
Types of Metals That Attract Magnets
Science Project on an Electric Bell
Types of Magnets
How Does a Magnet Lose Its Magnetism?
What Is a Ferrite Clamp?
Why Are Magnets Used in Recycling?
How Do Magnets Attract & Repel?

Dont Go!

We Have More Great Sciencing Articles!