How to Install a Double Pole Circuit Breaker

man working on an electrical box
  • 1 hours
  • Beginner
  • 25
What You'll Need
220 volts circuit breaker
Two-prong light-up electrical tester
Wire cutter/wire stripper

You can learn how to install a double pole circuit breaker, also known as a 240-volt circuit breaker, all on your own. Be sure to check that your breaker panel has enough space for this. Below are the materials that you need along with the instructions on how to install a double pole circuit breaker.

Step 1 - Turn Off Electricity

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Before you start, make sure that the electricity source on the breaker panel is turned off. Simply turn off the main high amperage breaker (100-250 Amps) which is located at the top of your breaker panel.

Step 2 - Test To Make Sure Electricity is Off


Remove the cover of your breaker panel. To test that the electricity is really turned off, use a two-prong light-up electrical tester and make one prong touches the terminal screw on anyone of the breaker in your panel breaker. Place the other prong onto any other metal object in your breaker panel. If the electricity is really turned off, the electrical tester will not light up.

Step 3 - Strip Wires of Double Pole Circuit Breaker

Take the wire of the double pole circuit breaker. Using a wire cutter or a wire stripper, strip the wires off ½ inch of insulation from the black, red, as well as the white wires you find. Do this until you expose the bare copper wires. Make sure the wire is gauged well in order to support the amperage of the breaker.

Step 4 - Install Double Pole Circuit Breaker

Install the double pole circuit breaker on the existing breaker panel. Position the double pole circuit breaker horizontally using your hand. The switch should face the middle portion of your breaker panel. The screws at the back of the circuit breaker should face sideways on the wall. Insert the circuit breaker in the breaker panel and push the front of it onto the bus bar. Push it securely in place until you hear it snap, indicating that it is secure.

Step 5 - Wire Double Pole Circuit Breaker

wiring a circuit breaker

The double pole circuit breaker can now be wired. Place the red wire at the bottom of the screws at the back of the breaker. Place the black wire at the bottom of the screw located behind the breaker. Tighten the screws so that the wires are securely in place. Attach the white wire to the neutral bar of the breaker panel. This part of the breaker panel can be found to the right side or left side of the breakers. Attach the white wire under a set of screws that are on the neutral bar as well. Tighten the screws to secure the wires. The bare copper wire should be connected to the ground bar which holds the copper and green ground wires.

Step 6 - Return Cover of Breaker Panel

Once all the wires are secured and in place, you can return the cover of your breaker panel. Turn the power of the electricity back on.

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