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How to Change a Square D Circuit Breaker: 5 Easy Steps

Written by Edwin Jones / Fact checked by Andrew Wright

how to change a square d circuit breaker

Want to figure out how to change a Square D circuit breaker? Here’s a quick rundown of how to do it:

  • Install the clamps on the mounting rail at the outer end of the new Square D switch
  • Connect the breaker switch’s back end to the bus bar connector
  • Change the breaker box lid and lock the screws
  • Re-energize the main power switch, then all of the other breaker switches

Oftentimes, a Square D breaker will fail and refuse to return to the “On” state. When all the appliances on the circuit are unplugged and all the lights are turned out, the breaker switch will not reset to the “On” position; it’s time to replace it.

We’ll go over the necessary tools for this process. We’ll also give you step-by-step instructions to replace Square D breaker. So continue reading.


Circuit Breaker Installation and Replacement Tools You Need


Using the right tools, you can add circuit breakers and install or replace electrical circuit breakers appropriately. When working with electrical equipment and wires, insulated tools are necessary.

You’ll need the following tools to follow your plan to replace square D circuit breaker or install new circuit breakers in the circuit breaker panel. To fit well and perform effectively, make sure you have the correct brand and size.

1. Plywood or a rubber mat


When dealing with electrical equipment, hold on to this. Rubber is a natural dielectric substance that, due to its molecular structure, blocks the transfer of electric charge, blocking the free flow of electrons.

2. Safety goggles


Electricians deserve a lot of credit for improving their quality of life. Their key responsibilities include installing and maintaining safe electrical and mechanical systems in buildings. Their professions, however, expose them to a variety of risks involving potential eye hazards. Electricians must wear protective equipment, including safety goggles, while working to ensure their safety.

3. Insulated flashlight

A torch is a hand-held electric light that can be used as a portal. It is particularly significant in electrical projects because most of them necessitate the use of flashlights. After all, repairing work often includes working in dark areas, such as the inside of electrical boxes. A flashlight can be utilized in a variety of settings, including homes, cars, and even garages. As a result, it is an essential electrical tool.

4. Other insulated tools


Strip the insulation surrounding the cable connectors with a screwdriver, a hammer, and insulated wire strippers.5

5. Cable connectors

To replace the Square D breaker, you have to connect your circuit breaker to the breaker panel on the main panel.

6. Voltage tester


Voltage testers are necessary for safety and are used in practically all electrical projects and repairs. A voltage tester is a test lamp used to assess whether or not an electrical current exists between two locations in a circuit. Before beginning your project, check to see if the new circuit breaker is working correctly and no live wires.

A homeowner can effectively install a Square D homeline circuit breaker or repair a malfunctioning breaker in the breaker box with the correct tools and electrical knowledge.

Here are the 5 Steps to Replace the Square D Circuit Breaker


Step 1: Turn off each of your branch circuit breakers one by one

Turn off all independent circuit breaker switches and 240-volt circuit double breakers or branch circuit breakers. Turn off the main power switch, which could be a larger switch positioned above the other breakers or a standard size breaker labeled “Main” or “Main Power.”

Step 2: Remove the terminal screws and loosen them


With a slotted screwdriver, loosen the screws on the outside of the breaker box. Remove the breaker box’s cover.

Step 3: Remove the cover from the panel. To get to the breakers, unscrew the panel cover

By grabbing the back end of the switch on the inside of the panel and drawing it toward you, remove the failed Square D breaker from the panel to make room for the replacement breaker switch. After the inside end of the switch has been unplugged, pull the switch’s outside end away from the mounting rail.

Step 4: Remove the breaker


On wiring a Square D breaker, remove the black wire from between the terminal clamps by loosening the screw terminal on the Square D breaker with a screwdriver. Connect the black wire between the terminal clamps by replacing the breaker switch. Ensure that the terminal screw is securely fastened.

Step 5: Remove the old breaker and replace it with the new one. Then Power up


Snap the clamps on the mounting rail at the outside end of the new Square D switch. Connect the breaker switch’s back end to the bus bar connector. Replace the breaker box lid and tighten the screws. Re-energize the main power switch, then all of the other breaker switches. If the rebuilt switch remains in the on position while lights and appliances function on the circuit, the circuit breaker replacement is likely to succeed.

For a more in-depth guide on how to replace Square D circuit breakers, you may consider watching this:

Final Thoughts

Are you ecstatic to discover how to replace a Square D circuit breaker? You won’t have to pay a professional electrician to perform it for you if you simply follow our guide on how to change a square D circuit breaker.

Even if this is your first time doing Square D breaker replacement, you can complete the task just fine.

We would also like to hear about your experiences and outcomes after you’ve completed this guide. Feel free to post a comment in the section below. You can also forward this article to friends who are having trouble with the Square D breaker installation.

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