Domakihub How to Replace a Fuse Safely at Home
Restore power in minutes by identifying and swapping a blown fuse the right way.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
A blown fuse is one of the most common reasons a room suddenly goes dark or an appliance stops working — and in older Greek homes, holiday rentals, and small hotels that still use ceramic fuse panels, it is a task every property owner should know how to handle. The video above walks you through the process visually; the steps below give you the exact procedure, safety rules, and amp ratings to get it right the first time. With the correct replacement fuse on hand, the whole job takes under ten minutes.
Fuses vs. Circuit Breakers: What You Are Dealing With
Many properties across Greece — particularly older apartments, rural villas, and island holiday homes — still use ceramic cartridge fuse panels (the kind with individual fuse holders you pull out by hand) rather than modern trip-switch consumer units. When a circuit is overloaded or a short circuit occurs, the thin wire inside the fuse melts and breaks the circuit, cutting power to that zone before wiring in the walls can overheat.
Modern installations use circuit breakers that simply trip and can be reset, but if your property has the older style, you will need to rewire or swap the blown fuse element before power returns. Understanding which type of panel you have is the first step.
Matching the Right Amp Rating
Every circuit in your home is protected by a fuse rated for a specific current: typically 6 A for lighting circuits, 16 A for standard socket outlets, and 25 A or 32 A for heavy appliances like electric stoves, heat pumps, or EV chargers. Installing a fuse with a higher amp rating than the circuit is designed for is dangerous — it allows more current to flow than the wiring can safely carry, which can cause wires inside walls to overheat and start a fire.
Always replace like-for-like: check the number stamped on the old fuse wire spool or fuse cartridge and match it exactly. If a replacement keeps blowing, that is a sign of an underlying fault on the circuit — call a licensed electrician (ηλεκτρολόγος) rather than fitting a stronger fuse.
How to Replace a Blown Fuse: Step by Step
- 1
Switch Off the Main Isolator
Before touching anything in the fuse panel, flip the main isolator switch (the large switch at the top of the board) to the OFF position. This cuts power to all the fuse holders below and makes the work safe. Never work on a live panel. If possible, use a torch or headlamp rather than relying on phone light so both hands stay free.
- 2
Identify the Blown Fuse
Pull each fuse holder out one by one (they simply clip or slide out) and inspect the thin wire bridging the two terminals. A blown fuse will show a melted gap, a blackened interior, or a snapped wire. On cartridge-type fuses, the ceramic tube may appear scorched. If all fuses look intact but power is still out, use a battery-powered fuse tester or a simple continuity tester to confirm which one has failed.
- 3
Remove the Old Fuse Wire or Cartridge
For rewireable fuses: loosen the two small terminal screws on the holder and remove the remnants of the old wire. For cartridge fuses: simply pull the cartridge free from its clips. Set the old element aside — you will need to match its amp rating before buying a replacement. Note the colour coding on the wire spool (in European standards: grey or white = 6 A, blue = 16 A, yellow = 25 A, red or orange = 32 A).
- 4
Fit the New Fuse Wire or Cartridge
For rewireable fuses: cut a short length from the correct-amp fuse wire, thread it through the centre of the porcelain carrier, and secure each end clockwise under the terminal screws before tightening firmly — a loose connection creates heat. For cartridge fuses: press the new cartridge of the matching amp rating into the clips until it clicks. Never use substitute materials such as aluminium foil, copper wire, or a nail — these bypass the protection entirely and create serious fire and shock hazards.
- 5
Refit the Holder and Restore Power
Slide or clip the fuse holder back into the panel in the correct slot, then turn the main isolator back ON. Test the circuit — switch on the lights or appliance that lost power. If it works and stays working, the repair is complete. If the fuse blows again immediately, there is a fault on the circuit (a short, a faulty appliance, or overloaded wiring) and you should leave the fuse out and contact a licensed electrician to diagnose the problem.
Rather have a pro handle it?
Get a vetted electrician pro in your city — one number, booked in EN/EL/DE.
FAQ
- How do I know which fuse has blown if the panel has no labels?
- Pull each fuse holder out individually and inspect the wire inside. A blown fuse has a visible gap, melted wire, or black scorch marks inside the holder. You can also use a cheap continuity tester: place one probe on each terminal of the removed fuse — no continuity means it is blown. Once you have identified the faulty one, label the panel slots so you can find them quickly next time.
- Can I use a higher-amp fuse if I do not have the right one?
- No. Fitting a fuse with a higher amp rating than the circuit is designed for removes the protection the fuse provides. If the wiring overheats, the fuse will not blow to stop it — and a fire can result. Always use the exact amp rating. If you cannot find the correct replacement immediately, leave the circuit off and buy the correct fuse before restoring power.
- How often do fuses blow and when should I upgrade to a modern consumer unit?
- An occasional blown fuse after a power surge or overloaded socket is normal. If fuses blow repeatedly on the same circuit, or your panel is more than 30 years old and still uses rewireable ceramic fuses, it is worth asking an electrician about upgrading to a modern RCD-protected consumer unit (πίνακας ασφαλειών). Modern units trip and reset without replacing any parts, and the RCD protection dramatically reduces the risk of electric shock — especially important in holiday rentals and hotels where guests may not be familiar with the property.