How to wire a dpst switch

Written by tracy underwood
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How to wire a dpst switch
A DPST switch can control two lines simultaneously. (Jupiterimages/ Images)

A double pole single throw (DPST) switch is electrically similar to a pair of single pole single throw (SPST) switches. The difference is that in a DPST switch, both contacts must be in the same position, either on or off. By contrast, two SPST switches may be operated independently. The most common use for a DPST switch is to control a 240-volt appliance, where both supply lines must be switched, while the neutral wire may be permanently connected.

Skill level:

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Things you need

  • Multimeter
  • Screwdriver

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  1. 1

    Disconnect power to the circuit. Identify the four connections on the switch. There should be a diagram embossed on the switch body. Double-check the switch in both on and off positions, using the multimeter.

  2. 2

    Loosen all four screws with the screwdriver. Connect supply lines 1 and 2 to the two input connections on the switch. Tighten the screws.

  3. 3

    Connect input lines 1 and 2 from the appliance to the two output connections on the switch. Tighten the screws.

  4. 4

    Connect the neutral wire from the appliance to the neutral supply wire. Reconnect power to the circuit.

Tips and warnings

  • Never attempt to work on a live circuit.
  • Double-check your work with the multimeter to ensure that there are no short circuits.

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