Keyword Analysis & Research: reed switch with magnet

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What is reed switch, and which magnets operate them?

Reed switch. A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch.

How to use a reed switch?

• Using one magnet: Once a permanent magnet has been brought close to the reed switch the contacts close. When the permanent magnet is then withdrawn the contacts stay closed. The permanent magnet then must be rotated, reversing its magnetic polarity. When it is then brought close to the reed and biasing magnet again, it will open the contacts.

What is a normally open magnetic switch?

Normally-open operation is great for turning lights on when you place a part with a magnet mounted inside in a specific location, and can be used to turn lights on and off inside a build without needing an exposed external switch. What other uses will you dream up for these switches?

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