In most electric distribution system the circuit is protecte

In most electric distribution system the circuit is protected from overload by fuses or circuit breakers in series/parallel with the various electrical devices.

Solution

A fuse is nothing more than a short length of wire designed to melt and separate in the event of excessive current.Fuse are always connected in series with the components to be protected from over current,so that when the fuse opens it will open the entire circuit and stop current through the component.