How To Wire Single Throw Double Pole Switch

Are you doing electrical work and need to learn how to wire a single throw double pole switch? This article will give you the details you need to do so. Wiring can be tricky and if not done correctly can cause major problems from electrical shock to fire. Know how to wire before you start. If you are unclear on something, have an electrician do it for you. It's better to be safe than sorry later. 

What is a single throw double pole switch? It is a double pole single throw (DPST) switch controls the connections to two wires at once, where each wire only has one possible connection. In other words, it's like two simple switches controlled by a single actuator. The DPST switch often appears in circuit breakers, where it is used for 240-volt circuits, with each pole carrying 120 volts separately. It can also be used at home to completely disconnect a circuit from its electrical power source by controlling the hot and neutral wires at once, eliminating all possible paths between the disconnected area and the power supply. DPST switches are also sometimes used to control parallel-wired lights or machines simultaneously.

Materials Needed:

  • Wire Caps
  • DPST switch
  • Wire strippers
  • Electrical wire


  1. Use the correct gauge wire. Wire your circuits the way you would normally do wiring. Be sure to use the right wiring for what you are doing. If you don't this could create problems. If unsure what type of wiring you need, talk with a professional.  For standard wiring it's usually a twenty amp circuit and twelve gauge wire.
  2. Connect your switch as with any switch. Be sure to handle each pole separately from the other. Placing wire caps as needed.
  3. Check to ensure there is no cross connections between the poles. Check yourself at least two to three times to be sure. It's better to be safe than sorry.
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