The current flowing through an appliance can be calculated by rearranging the equation: Once the current is known the next highest fuse rating is chosen. A fuse rated below the normal operating cu ...

Fuses in plugs are made in standard ratings. The most common are 3 A, 5 A and 13 A. The fuse should be rated at a slightly higher current than the device needs: if the device works at 3 A ...