How to Check a Fuse in a UK Plug (Step-by-Step Guide)

If your appliance has suddenly stopped working, don’t panic—it might just be a blown fuse in the plug. UK plugs are designed with built-in fuses as a safety feature, and checking or replacing one is easier than you might think.

In this quick guide, we’ll show you how to check a fuse in a UK plug using a multimeter, so you can troubleshoot like a pro.

What You’ll Need:

• A small screwdriver

• A multimeter

• A replacement fuse (same amp rating, e.g. 3A, 5A, or 13A)

How to Check a Fuse in a UK Plug

1. Unplug the Device

Always start by unplugging the appliance from the socket. This is essential for your safety.

2. Open the Plug

Most UK plugs are held together with a single screw. Use a screwdriver to remove it, then carefully open the plug casing.

3. Locate the Fuse

Inside the plug, you’ll find a small cylindrical fuse, typically located next to the live (brown) wire. It will be marked with its amp rating—commonly 3A, 5A, or 13A.

4. Remove and Inspect the Fuse

Gently lift the fuse out of its clips. While you might spot visible signs of damage—like a broken filament or black scorch marks—these aren’t always present when a fuse has blown.

5. Test the Fuse with a Multimeter

To be sure whether the fuse is working, use a multimeter set to the continuity or ohms setting.

• Touch one probe to each end of the fuse.

• If the multimeter beeps or shows a reading close to zero ohms, the fuse is intact.

• If there’s no sound or the display shows "OL" (open loop), the fuse is blown and should be replaced.

✅ Pro Tip: Always replace a fuse with one of the same rating. Using a higher-rated fuse is dangerous and can risk damaging your device or causing electrical hazards.

6. Reassemble the Plug

Once the fuse is tested or replaced, fit it securely back in place. Reassemble the plug, tighten the screw, and plug it back in to see if your device powers up.

Final Thoughts

Knowing how to check a fuse in a UK plug is a quick, useful skill that can save you time, money, and stress. It’s also a great first step in troubleshooting common household electrical issues.

Still having problems? If replacing the fuse doesn’t solve the issue, the problem may lie with the appliance itself, and it could be time to call a professional.

If you require a simple to use, budget multimeter for DIY and home use, please see our Kaiweets multimeters here.