How to Change a Blown Fuse

Knowing how to change a blown fuse can be helpful if you think a switch tripped and its faulty. Don’t call someone when you can fix it yourself.

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Dealing with home electricity can be very intimidating. However, there may be a time you have to change a blown fuse in your home circuit breaker box or fuse box. This is the spot in your home that manages your electrical connections. Circuit breakers will trip off when there is a surge in electricity or some other type of malfunction. This serves to protect your home’s electrical system. However, sometimes a circuit breaker will trip repeatedly for no reason. When this happens, it is time to replace the fuse. You can learn how to do this yourself as long as you remember to always use extreme caution and care.

In this article, Part 1 explains how to find the blown fuse, Part 2 describes how to remove the fuse, Part 3 explains how to find the replacement, and Part 4 describes how to replace the blown fuse.

Part 1 of 4: Find the blown fuse

Materials Needed

  • Multimeter unit
  • Screwdriver

Step 1: Find and open the circuit breaker fuse box. Depending on the type, age, and location of your house, your fuse box may be inside or outside your home.

Once you find it, you may need a screwdriver to open it. If it is screwed shut, remove the screws and set them aside. No matter, before doing so, make sure you do not have any metal on you that can encounter you and the box simultaneously. Also, make sure there isn’t any water around.

Step 2: Turn off main electricity switch. Look for the main electricity switch that leads to all the individual fuses, and switch it to the off position.

Step 3: Look for an individual fuse in off position. This is one of the first indicator that something is wrong.

However, a blown fuse can still be in the on position so use caution.

Step 4: Look for signs of damage. A blown fuse may have signs of overheating or damage.

It may have a burnt look. It may just look odd compared to the others around it. It could even omit an electrical smell.

Step 5: Check for voltage. Use the multimeter unit to see if the suspected fuse has power.

If not already set to off, make sure you switch it to the off position. Take one pin of the multimeter and put it on the terminal screw of the blown fuse. Put the other pin on a ground screw, which is typically on a bar on the side of the fuse box. If it does not register any voltage, it is a blown fuse. If it does, stop immediately. It is time to seek the help of an electrician.

Part 2 of 4: Remove the fuse

Materials Needed

  • Screwdriver

Step 1: Pull the fuse out. You might be able to pull the blown fuse out its socket or you may have to unscrew it.

Before pulling the fuse out, double check to ensure the main switch and the individual fuse switch are in the off position. Use the screwdriver to remove any screws if there are any.

Step 2: Disconnect the wires. Loosen the terminal screws.

When disconnecting the wires, make note of which wire connect to what end of the fuse. There should only be one or two wires and they should be different colors. Put the terminal screws to the side.

Part 3 of 4: Find the replacement fuse

*Step 1: Find the right replacement for the blown fuse. You can check the amperage and voltage on the fuse.

To be completely sure, take the blown fuse with you to the store and let the salesperson make sure you get the right replacement.

Part 4 of 4: Replace the blown fuse

Materials Needed

  • Screwdriver

Step 1: Turn new fuse off. The replacement fuse will have a switch that must be set to off position.

Step 2: Insert wires. Check your notes and connect the existing wires to the correct spots.

Use the screwdriver to replace and tighten the terminal screws.

Step 3: Replace fuse. Put the new fuse in its socket.

If it has screws to secure it, replace and tighten them.

Step 4: Turn on. Switch the new circuit breaker fuse to the on position. Switch the replacement fuse to the on position. Then switch the main power switch to all the individuals fuses back to the on position as well.

Circuit breaker boxes are an important part of your home’s electrical system. It serves as the major connection between the main power source and the other areas of your house. Unfortunately, its fuses are not made to last forever and you may need to change a faulty one. If you know how to find the blown fuse, remove it, find its replacement fuse and change it out, you can fix your issue. However, remember when dealing with electricity to always use caution.

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