The fuse wire is stretched between the two metallic terminals.$$T_1$$ and $$T_2$$ in a porcelain holder (since porcelain is an insulator of electricity).This folder fits into a porcelain socket having two metallic terminals to which the live wires of the circuit are connected.The figure below is showing the fuse arrangement.
A fuse is connected with each electrical appliance to safeguard it form the flow of excessive current through it.