How to Check Fuse With Multimeter

How to Check Fuse With Multimeter

A multimeter is a versatile tool that can be used to check various electrical components, including fuses. Fuses are safety devices that protect electrical circuits from overloading and prevent potential damage or fire hazards. It is essential to check fuses regularly to ensure they are functioning correctly. Here’s a step-by-step guide on how to check fuses using a multimeter.

Step 1: Preparation
Before starting, gather the necessary tools and equipment. You will need a multimeter, a screwdriver (if the fuse is enclosed), and safety gloves. Ensure that the device you are testing is not connected to any power source to avoid accidents.

Step 2: Set the multimeter
Set your multimeter to the resistance (ohms) mode. This mode is usually indicated by the omega symbol (Ω). On most multimeters, you can rotate the dial to select the resistance mode.

Step 3: Remove the fuse
If the fuse is enclosed, use a screwdriver to open the fuse box or panel. Carefully remove the fuse from its socket, ensuring not to touch the metal ends to prevent electric shocks.

Step 4: Check the fuse with the multimeter
Hold the fuse by its ends and touch the multimeter probes to each metal end of the fuse. Make sure the probes have a good contact with the metal. The multimeter will display the resistance value of the fuse.

Step 5: Interpret the multimeter reading
If the multimeter displays a reading close to zero or very low resistance, it indicates that the fuse is working correctly. This means that the fuse is conducting electricity through it, allowing the electrical circuit to function correctly.

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On the other hand, if the multimeter displays a reading of infinity (∞) or a very high resistance value, it indicates that the fuse is blown or faulty. A blown fuse means that it is not conducting electricity, and the circuit is interrupted. In this case, the fuse needs to be replaced.


1. Why do fuses blow?
Fuses blow when they detect an excessive current flow in the circuit. This can happen due to overloading, short circuits, or faulty electrical appliances. The purpose of blowing the fuse is to protect the circuit from damage and prevent potential hazards.

2. Can I check a fuse without a multimeter?
Yes, you can check a fuse without a multimeter by visually inspecting it. Look for any signs of a blown fuse, such as a broken filament or a discolored appearance. However, this method is not as accurate as using a multimeter.

3. Can a fuse be tested while still in the circuit?
Yes, it is possible to test a fuse while it is still in the circuit. However, this method may not provide accurate results due to the presence of other components and connections in the circuit. It is recommended to remove the fuse from its socket for a more accurate reading.

4. Are all fuses the same?
No, fuses come in different types and sizes, depending on their application and the electrical system they protect. It is crucial to use the correct type and rating of fuse for each specific circuit to ensure proper protection.

Regularly checking fuses is essential to maintain the safety and functionality of electrical systems. By following the steps outlined above and using a multimeter, you can easily determine if a fuse is blown or faulty. Remember to always exercise caution and wear safety gloves when working with electricity.

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