How to Change a Fuse

Fuses and circuit breakers are safety devices that disrupt the flow of electricity in your home when needed. They are part of the main system that distributes electricity into your home. When a breaker is tripped and has broken the circuit, it can be reset to provide further protection to the circuit. Fuses are metal safety devices that melt during over-currency, stopping the distribution of electricity to your home.

While circuit breakers can be easily reset, fuses must be replaced. Remember to be safe when working with electricity: wear rubber shoes, gloves, and safety glasses, and check to see if the floor below the fuse box is dry.

What You Will Need:

  • Screwdriver
  • New Fuse (of the same amperage as the original)
  • Multimeter Unit
  • Safety Equipment

Follow these instructions to change your circuit breaker fuse:

Step One: Turn Off the Main Power Supply

Open your fuse box and find the main power switch. Ensure that it is in the “off” position.

Step Two: Identify the Faulty Fuse

Inspect the fuses to determine which one needs to be replaced. Different types of fuses show different symptoms when they’re the problem. Look for a breaker in the “off” position that cannot reset or be turned back on, or a fuse whose metal has been melted, scorched, or discolored. This will tell your which fuse is broken and needs to be changed.

Step Three: Check for a Current

At this point, you need to check and make sure there is no electricity running through the fuse you want to replace. Ensure the damaged fuse is set to “off”. Then, use a multimeter unit to double-check for currency. Set the multimeter to “Volt AC”. Put one pin on the terminal screw of the fuse you’re replacing and the other pin on the ground screw, which is opposite the terminal screw in a row on the side of the box. The multimeter should indicate there is no voltage. Do not continue if it says otherwise.

Step Four: Remove the Fuse

To remove the fuse, unscrew it or simply pull it from its socket.

Step Five: Insert the New Fuse

First, it’s important to ensure your new fuse is of the same amperage of the old one. The best way to do so is to take your old fuse with your to a hardware store when you purchase your new fuse. Set your new fuse to “off”. Insert the original wires into the terminals of the new fuse and tighten the screws with a screwdriver. Push the fuse into its socket, ensure it’s in place, and turn it to the “on” position.

Step Six: Reconnect the Power Supply

Finally, turn the main power switch back on, and close the fuse box. You have successfully changed a fuse. Plug in some appliances associated with the fuse box you worked on to ensure your problem has been solved.