how to change circuit breaker fuse


Why Should You Learn to Change a Circuit Breaker Fuse?

The circuit breaker is an essential component of any electrical system. It protects your home from electrical overloads and short circuits by automatically shutting off the power to the affected area. However, circuit breakers can occasionally trip or fail, requiring you to change the fuse. Learning how to change a circuit breaker fuse is a valuable skill for every homeowner. Not only does it save you money by avoiding costly service calls, but it also empowers you to handle minor electrical issues in your home safely. In this article, we will walk you through the step-by-step process of changing a circuit breaker fuse, ensuring you have the knowledge and confidence to do it yourself.

Understanding the Basics: How Does a Circuit Breaker Work?

Before we delve into the details of changing a circuit breaker fuse, it's important to understand the basics of how a circuit breaker works. A circuit breaker consists of three main components: a switch, an electromagnet, and a trip mechanism. When electrical current flows through the circuit, the electromagnet becomes magnetized, holding the switch closed. However, in the event of a fault, such as an overload or short circuit, the electromagnet becomes too strong and pulls the switch open, cutting off the power.

Gathering the Required Tools and Safety Equipment

Before attempting to change a circuit breaker fuse, it's crucial to gather all the necessary tools and safety equipment. This ensures you have everything you need to complete the task efficiently and without putting yourself at risk. Here's a list of the essential items you'll need:

1. Safety goggles and gloves: These protect you from any potential electrical hazards or particles that may fly off during the process.

2. A flashlight: Since you'll be working with electricity, having a source of light is essential to see your way around the circuit breaker panel.

3. A voltage tester: This tool helps you determine if the circuit is live or not, ensuring your safety during the fuse replacement process.

4. A replacement fuse: It is important to have a new fuse on hand that matches the specifications of the one you'll be replacing.

5. A fuse puller or needle-nose pliers: These tools are necessary for safely removing the old fuse from the circuit breaker.

Identifying the Faulty Fuse and Turning off the Power

The first step in changing a circuit breaker fuse is identifying the faulty fuse and turning off the power to the circuit. Follow these steps:

1. Locate the circuit breaker panel: The circuit breaker panel is usually found in a utility room, basement, or garage. It houses multiple circuit breakers and is typically labeled for easy identification.

2. Open the circuit breaker panel: Use caution and wear safety gloves and goggles to protect yourself from any potential electrical hazards.

3. Identify the faulty circuit: Look for any tripped or partially turned off circuit breakers. Typically, a tripped breaker will be in the middle position.

4. Turn off the main switch: Find the main switch, usually located at the top or bottom of the panel, and flip it to the "off" position. This cuts off power to the entire electrical system in your home.

Removing the Faulty Fuse

Once the power is turned off, you can proceed to remove the faulty fuse from the circuit breaker. Follow these steps:

1. Locate the faulty fuse: Identify the fuse that belongs to the disrupted circuit. It will be in the "off" or partially tripped position.

2. Prepare your tools: Put on your safety goggles and gloves, and make sure you have your flashlight, voltage tester, and fuse puller or needle-nose pliers handy.

3. Test for live current: Use a voltage tester to check for any live current in the circuit before proceeding. This ensures your safety while working on the fuse.

4. Gently remove the faulty fuse: If you're using a fuse puller, insert it into the designated slot and gently pull the fuse out. If you're using needle-nose pliers, carefully grip the fuse and pull it straight out of its housing.

Installing the Replacement Fuse

Now that the faulty fuse has been removed, it's time to install the replacement fuse. Follow these steps:

1. Check the replacement fuse: Before inserting the replacement fuse, double-check that it matches the specifications of the old fuse. They should have the same amp rating and be compatible with your electrical system.

2. Prepare the replacement fuse: Handle the replacement fuse with caution, making sure not to touch the metal parts. Any oil or dirt on your fingers can cause the fuse to overheat or fail.

3. Insert the replacement fuse: Align the replacement fuse with the slot and gently push it into place until it is fully seated. Make sure it fits snugly and does not wiggle or move.

Restoring Power and Testing the Circuit

With the replacement fuse securely in place, it's time to restore power and test the circuit. Follow these steps:

1. Close the circuit breaker panel: Carefully close the circuit breaker panel, ensuring that it is securely fastened.

2. Turn on the main switch: Locate the main switch and flip it to the "on" position, restoring power to the entire electrical system in your home.

3. Test the circuit: Once the power is restored, use a voltage tester to check if the circuit is functioning correctly. If the tester indicates an issue, recheck the fuse installation and consider consulting a professional electrician.


Changing a circuit breaker fuse is a valuable skill that every homeowner should learn. By understanding the basics, gathering the necessary tools, and following the step-by-step process outlined in this article, you can safely and confidently replace a faulty fuse. Remember to always prioritize safety, wearing protective gear and testing for live current before working on any electrical components. With these skills at your disposal, you can save money on service calls and address minor electrical issues in your home independently.


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