Electricians Guide to Fixing a Tripped Fuse

When part of your home suddenly loses power, a switch in the consumer unit may have tripped. You can make a few straightforward observations, but repeated tripping needs professional investigation.

What has actually tripped?

Many homes have a consumer unit with circuit breakers and residual current devices (RCDs). A circuit breaker may trip because of excessive current or a fault. An RCD is designed to disconnect the supply when it detects an imbalance that can indicate current leaking to earth. Older installations may also have replaceable fuses. These are different devices, even though people sometimes call all of them the “fuse box”.

Check whether the consumer unit is safe to approach

Only look at or operate the normal user-accessible switches if the unit and the area around it are dry and undamaged. Do not remove any protective cover, expose wiring or attempt repairs.

If you notice burning smells, heat, buzzing, smoke, water damage or scorching, leave the equipment alone. Where there is fire or immediate danger, get to safety and call 999.

What can you safely do after a trip?

First, see whether the outage affects one room or circuit or the whole property. If neighbours also have no power, there may be a supply interruption rather than a fault in your home.

If there are no warning signs and you are comfortable using the normal switches, the device may have a labelled reset position. Follow the consumer-unit manufacturer’s instructions. A single reset may restore the supply after a temporary incident, but it does not prove the installation is safe or establish what caused the trip.

If a switch trips again or refuses to reset, leave it off. Do not keep trying, bypass protection or change a plug or fuse at random to force the power back on.

Could an appliance be responsible?

An appliance, damaged flex or fixed wiring fault can trigger a protective device. If an appliance appears damaged, wet, unusually hot or has caused a trip, leave it out of use and consult its manufacturer or a qualified repair professional. Do not open the appliance casing or repair its electrical connections yourself.

When to call an electrician

Arrange a registered electrician if the trip repeats, the cause is unclear, more than one circuit is affected or the unit is damaged. They can test the installation and identify whether the issue is overload, earth leakage, faulty equipment or another wiring problem.

For more about the reasons devices trip, see our guide to common electrical trips. To arrange a safe inspection or fault finding, contact our electrical team.