When a fuse blows

If your home has no power or only some circuits have power, the problem may be in the fuses that protect your mains connection and your property's electrical circuits. If some circuits still work, check the fuse(s) of the other circuit(s). You can replace fuses without assistance. Check the ratings of fuses used in your apartment and always have a couple of spare fuses of the correct rating available.

The fuses are usually in a switchboard located in an equipment space or a hallway. The switchboard has main fuses, the main switch, an electricity meter and circuit-specific fuses. In blocks of flats and terraced houses the main switchboard is usually located somewhere outside the apartment, and each apartment has a distribution board, often simply called fuse panel, with an apartment-specific main switch and fuses for the various circuits of the apartment.

Replacing a fuse

You can replace fuses without assistance. If the fuse was blown because a faulty electric appliance or an appliance you suspect to be faulty, remove the appliance from use immediately and take it to a repair shop if required. Fuses may also blow because of overload.

Automatic fuses (circuit breakers) can be reactivated by returning the switch to the active position. If the fuse is a traditional plug fuse, remember to switch off the power by turning the main switch to the 0 position before replacing the fuse.

Replace the blown fuse with a similar new fuse. Check the rating of the fuse from the coloured marking at the head of the fuse, the label next to the fuse socket or the colour of the socket base after the blown fuse has been removed. The rating of the fuse is also marked numerically in the bottom of the fuse.

If the fuse blows or the circuit breaker trips again immediately after the power is switched back on, disconnect all electric appliances from the circuit and reconnect them one by one. First switch off the power by removing the fuse or by opening the circuit breaker. Reconnect an appliance and switch the power back on. If operating the appliance causes the fuse to blow or the circuit breaker to trip, the appliance is defective and must be removed from use. Repeat this for all appliances.

If none of the appliances connected to the circuit cause the fuse to blow when operated individually, the fuse may have been blown because of overload, in other words the current drawn by the electric appliances connected to the circuit has exceeded the nominal rating of the fuse. This is a common problem especially in old houses with fuses not dimensioned for the number of electric appliances commonly used in homes today.

Maximum ratings of fuses commonly used in homes:

Normal current Maximum load Colour
6 A 1,400 W green
10 A 2,300 W red
16 A 3,700 W gray
20 A 4,600 W blue
25 A 5,750 W yellow
35 A 8,050 W black