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How to wire a micro switch

Updated April 17, 2017

Switches are used to complete electrical circuits. When a switch is flipped an internal contact connects and allows electricity to pass through the circuit. Like some toggle switches, a micro switch can be used to perform two different actions. One contact can control left movement and the other right movement. With a micro switch the separate movements can be made very quickly. With a micro switch there is no neutral or off position. One circuit is by default constantly on until contact is made in the switch to engage the other position. If the second or nonconstant leg is not wired then the micro switch will act as a brake or pause to the action.

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  1. Cut four pieces of wire 30 cm (12 inches) long. Strip the plastic coating off the wire 1.2 cm (1/2 inch) from each tip on the wires.

  2. Attach one wire to the positive terminal on the light socket. Attach the other end to the positive terminal on the battery.

  3. Attach a wire to the negative terminal on the light socket. Attach the other end to the NO, or normally open, terminal.

  4. Attach a wire to the common terminal of the micro switch. Attach the other end of the wire to the negative terminal on the battery.

  5. Turn on the light by pressing the button. As long as you hold the button the light will stay on.

  6. Tip

    To have the light remain on until you press the button, in Step 3 wire it to the NC, or normally closed, terminal. To have the micro switch turn on two lights, of different colours for example, follow Steps 1-3 for the second socket wiring it to the NC terminal and omitting Step 4. Morse code can be practised using this simple micro switch.


    To make a permanent circuit, use connectors and electrical tape for safety.

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Things You'll Need

  • Light socket
  • Light bulb
  • Micro switch
  • Wire
  • Battery

About the Author

Tony Thorson has been a freelance writer since 2000. He works with several independent businesses and private clients. He writes articles, blogs, commentary, hand books and newsletters. He taught English and grammar to his four home-schooled children from fourth grade to senior year. He also has 15 years of experience managing and he runs ThorsonGroup, a group of writers.

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