How to Change a Fuse: A Comprehensive Guide by Prometheus Electrical

Jan 4, 2024


Welcome to Prometheus Electrical, your go-to source for all things related to lighting fixtures & equipment and electricians. In this article, we will take you through a step-by-step guide on how to change a fuse. Whether you're a homeowner or a business owner, knowing how to change a fuse is a valuable skill that can save you time and money. With our expert advice, you'll be equipped with the knowledge to complete this task effortlessly.

Understanding Fuses

Before we dive into the process of changing a fuse, let's briefly discuss what fuses are and why they are crucial in electrical systems. A fuse is a safety device that protects electrical circuits from excess current. When the current flowing through a circuit exceeds the rated capacity of the fuse, it will blow or melt, interrupting the flow of electricity and preventing damage to the circuit or devices connected to it.

Gathering the Necessary Tools

Before you start changing a fuse, it's important to gather the necessary tools to complete the task efficiently. Here are the essential tools you'll need:

  • Screwdriver (flathead or Phillips, depending on your fuse box)
  • A new fuse of the same rating (make sure to choose the correct type and size)
  • Electrical tape (optional but recommended)

Identifying a Blown Fuse

The first step in changing a fuse is identifying whether a fuse is actually blown. Here's how you can check:

  1. Locate your fuse box or consumer unit. This is usually found in a basement, utility room, or garage.
  2. Open the fuse box using a screwdriver. Be careful as some fuse boxes may have live parts. If you're unsure, it's best to call a professional electrician.
  3. Inspect the fuses. Look for any fuses with a broken wire or a darkened glass window. These are signs of a blown fuse.

Changing the Blown Fuse

Once you've identified the blown fuse, it's time to replace it. Follow these steps:

  1. Make sure to switch off the main power before proceeding. This is crucial for your safety.
  2. Using a screwdriver, gently remove the blown fuse by applying slight pressure in the opposite direction of the retaining clip.
  3. Take your new fuse and insert it in the same slot as the blown fuse. Ensure it is properly seated and aligned.
  4. Turn the retaining clip back in place to secure the fuse.
  5. Switch the main power back on and test the circuit to ensure everything is functioning correctly.

Tips for Fuse Replacement

Here are some additional tips to keep in mind when changing a fuse:

  • If you are unsure about any steps or if the fuse blows repeatedly, it's best to consult a licensed electrician
  • Always use a fuse with the correct current rating to avoid electrical hazards
  • Consider keeping spare fuses in case of emergencies
  • It's a good practice to label your fuse box to easily identify which fuses correspond to specific circuits


Congratulations! You have successfully learned how to change a fuse with Prometheus Electrical. Remember, safety should always be your top priority when working with electrical systems. If you encounter any difficulties or have any doubts, don't hesitate to contact our team of expert electricians. At Prometheus Electrical, we take pride in providing high-quality lighting fixtures & equipment and professional electricians to meet all your electrical needs.

Disclaimer: This article is for informational purposes only. Always exercise caution and consult a professional when dealing with electrical systems.