Tripped Fuse Box? Here's Exactly What to Do When You Lose Power at Home

Losing power at home is one of those moments that instantly makes you feel helpless. One second the lights are on, the kettle's boiling, and life is normal. The next, you're standing in the dark wondering what just happened and what to do about it.

Tripped Fuse Box? Here's Exactly What to Do When You Lose Power at Home

The good news: most power losses are caused by a tripped circuit breaker or blown fuse, and you can often fix it yourself in under five minutes. This guide walks you through the whole process, from the moment the lights go out to getting everything back on safely.

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Step One: Work Out What Caused the Power Loss

Before you touch anything, take thirty seconds to think. There are three common reasons a home loses power:

• A tripped circuit breaker or RCD in your fuse box (consumer unit)

• A blown fuse in an older-style fuse box

• A wider power cut affecting your street or neighbourhood

Knowing which one you're dealing with changes everything. If your neighbours' lights are also off, you've got a power cut and there's nothing to fix yourself. If it's just your home, or just one part of it, you're almost certainly looking at a tripped fuse box.

How to tell if it's a power cut

Look out of the window. Are streetlights off? Can you see lights in neighbouring houses? Check the UK Power Networks, Northern Powergrid, or Western Power Distribution outage map on your phone (your mobile data will still work). If there's a confirmed outage in your area, call your network operator's 24-hour line and wait it out.

If the rest of the street looks fine and it's just your property, move on to the next step.

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Step Two: Find Your Consumer Unit (Fuse Box)

Your consumer unit is usually located:

• Under the stairs

• In a hallway cupboard

• In the kitchen, near the meter

• In a utility room or garage

If you've never looked at it before, now's the time to get familiar. Modern consumer units have a row of individual circuit breakers (small switches) and at least one RCD (Residual Current Device), which looks like a slightly wider switch. Older properties may have a fuse box with rewirable fuses or cartridge fuses instead.

Grab a torch before you open the cupboard. Your phone torch works perfectly well.

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Step Three: Identify the Tripped Switch

Open the consumer unit cover. You're looking for a switch that's sitting in the middle position or has flipped down to the "off" position. On most modern units, the breakers are clearly labelled: "Upstairs Lighting", "Downstairs Sockets", "Cooker", "Shower", and so on.

A tripped breaker won't always be obviously down. Some only move to a halfway position. Run your eye along the row and look for anything that's out of line with the others.

If the main RCD (usually on the left, sometimes labelled "RCD" or "Main Switch") has tripped, you'll have lost power to multiple circuits at once. That's the one to reset first.

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Step Four: Reset the Tripped Breaker

Here's the process:

• Switch off or unplug appliances on the affected circuit. If a socket circuit tripped, go round and unplug everything on that ring. If it's a lighting circuit, turn off all light switches in that zone.

• Push the tripped breaker firmly to the OFF position first, then click it back to ON. Some breakers need to go fully off before they'll reset.

• If it's the RCD that tripped, press the test button first to confirm it moves freely, then push it back up to ON.

• Watch and listen. If the breaker clicks straight back off, there's a fault somewhere on that circuit. Do not keep resetting it repeatedly.

Once the breaker is back on, plug your appliances back in one at a time. If the breaker trips again when you plug in a specific appliance, that appliance is faulty. Unplug it and don't use it until it's been checked.

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Step Five: Find the Culprit Appliance

A circuit breaker trips because it detected either an overload (too much current) or a fault (a short circuit or earth leakage). Tracking down the cause is important, because resetting without finding the fault just means it'll trip again.

Common causes of a tripped circuit:

• A faulty kettle, toaster, washing machine, or hairdryer

• An extension lead that's overloaded (too many high-wattage devices on one strip)

• A light fitting with a bulb of the wrong wattage

• A damaged appliance lead with exposed wiring

• Water ingress near a socket or fitting (particularly in bathrooms and kitchens)

Go through each appliance methodically. Plug them in one at a time and switch on. When the breaker trips again, you've found your problem.

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Step Six: Know When to Call an Electrician

Some situations are not DIY territory. Call a qualified electrician if:

• The breaker trips repeatedly with nothing plugged in (there's a wiring fault on the circuit itself)

• You smell burning from the consumer unit or any socket

• You see scorch marks around a socket, switch, or the fuse box itself

• The RCD keeps tripping even after you've removed all appliances

• You have an older fuse box with rewirable fuses and the wire has blown multiple times

• You're not confident working near the consumer unit at all

A repeatedly tripping RCD is a particular red flag. RCDs are designed to protect against electric shock and fire. If yours won't stay on, there's a genuine fault somewhere and it needs a proper investigation, not just repeated resets.

If your home still has an old-style fuse box with ceramic fuse holders, it may be worth thinking about a full replacement. Modern consumer units with RCDs and MCBs (miniature circuit breakers) are far safer and more convenient. You can get a rough idea of what that involves using our fuse box replacement cost calculator.

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What to Do if the Power Won't Come Back On

If you've reset every breaker and the RCD and still have no power, check the following:

• Your electricity meter: Is the supply isolator switch (usually above or beside the meter) in the ON position? It can occasionally get knocked.

• Prepayment meter: If you have a prepay meter, your credit may have run out. Top up via the app or at a local PayPoint.

• Your DNO fuse: There's a sealed fuse at the top of your meter cabinet, fitted by your Distribution Network Operator. If this has blown, you'll have no power at all and you cannot touch it yourself. Call your DNO (not your energy supplier) to report it.

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Pricing: When You Need an Electrician

If the problem turns out to be a faulty circuit, a failing consumer unit, or something you can't resolve yourself, here's what you can expect to pay for professional help in 2026.

| Job | Typical Cost (2026) | |---|---| | Call-out + fault finding (1 hour) | £80 to £150 | | Replacing a single circuit breaker | £60 to £120 | | Consumer unit replacement (2-bed house) | £500 to £750 | | Consumer unit replacement (4-bed house) | £750 to £1,100 | | Full rewire (3-bed semi) | £4,000 to £6,500 | | EICR (Electrical Installation Condition Report) | £150 to £300 |

Prices vary by region and by the complexity of the job. A straightforward fault-find on a single circuit is usually a one-hour job. A consumer unit replacement typically takes a full day.

For a more detailed breakdown on rewiring costs, the house rewire cost calculator gives you a realistic figure based on your property size.

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Older Fuse Boxes: A Note on Safety

If your home was built before the 1990s and you've never had the consumer unit replaced, there's a reasonable chance you still have an older-style fuse box. These use rewirable fuses or cartridge fuses rather than circuit breakers, and they don't have RCD protection as standard.

The practical difference matters. When a fuse blows, you have to replace the fuse wire or cartridge rather than just resetting a switch. More importantly, without RCD protection, you have far less protection against electric shock and electrical fires.

The 7 warning signs your home needs rewiring guide covers the broader picture, but a consumer unit upgrade on its own, without a full rewire, is often a sensible and relatively affordable improvement. An electrician can assess whether your existing wiring is compatible with a new unit.

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Preventing Future Trips

A few simple habits will reduce the chances of this happening again:

• Don't overload extension leads. High-wattage appliances (kettles, toasters, microwaves, electric heaters) should each have their own socket, not share a four-gang extension.

• Replace old appliances with damaged leads. Frayed flex is one of the most common causes of trips and fires.

• Get an EICR every ten years (or every five years for rental properties). It'll flag any circuits that are deteriorating before they become a problem.

• Label your consumer unit if it isn't already. Knowing which breaker controls which circuit saves a lot of time in the dark.

If you're unsure whether your electrical installation is in good shape, get a quote from a local electrician for an EICR. It's not expensive and it gives you a clear picture of what, if anything, needs attention.

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FAQ

Why does my circuit breaker keep tripping even with nothing plugged in? If a breaker trips with no appliances connected, the fault is in the wiring or the breaker itself. This needs a qualified electrician to investigate. Don't keep resetting it.

Can I replace a fuse wire myself? Technically yes, if you have an older rewirable fuse box and you know what you're doing. Use the correct amp rating for the circuit (the fuse holder is usually marked). That said, if fuses are blowing repeatedly, call an electrician rather than keep replacing the wire.

What's the difference between a circuit breaker tripping and an RCD tripping? A circuit breaker protects a single circuit from overload or short circuit. An RCD protects against earth leakage, which is the type of fault that can cause electric shock or fire. When an RCD trips, it usually means a fault has been detected somewhere on any of the circuits it covers, which is why multiple circuits go off at once.

How much does it cost to have an electrician find an electrical fault? Most electricians charge a call-out fee plus an hourly rate. In 2026, expect to pay £80 to £150 for the first hour, which usually covers fault-finding on a straightforward problem. More complex faults may take longer.

Should I be worried if my fuse box is old? An older fuse box isn't automatically dangerous, but it may lack the RCD protection required under current regulations. If your box has no RCDs and hasn't been inspected recently, it's worth getting an EICR done. You can explore replacement costs using our fuse box replacement calculator.

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