The fuses in the fuse box ensure there's not too much electricity through a group of devices, as a safety precaution. If there's too much electricity through the fuse a wire inside wilt melt, which disconnects the power: the fuse is 'blown'. In case of power failure, it's the tenants responsibility to replace the fuses if necessary. You will recognise a blown fuse when the middle piece of metal is gone.
A fuse is made for single use only, you can't repair it. If the fuse is blown, please replace it by a new one before putting the power back on.
If you don't know which device is causing the problem:
The use of many power demanding devices in one electricity group may cause a fuse to fail. One electricity group is generally adjusted to a capacity of 16 Amps (3000 Watts), but a washer or dryer often already needs 2000-2500 Watts. When you connect a coffee machine (650 Watts) to the same group and use it at the same time, the fuse or the machine will fail. This is a safeguard to prevent fire!
To avoid unnecessary costs, it’s best to disconnect certain electrical appliances (e.g. old electrical ovens, old toasters). More information on main fuses and power failures.