The fuse functions like a circuit breaker to protect the conductor in case of overloading and fault current due to short circuit. A fuse is a circuit connection that will be destroyed by excessive current flow, creating an open circuit, to protect electrical appliances from receiving too high current. The simplest fuses contain thin wire strips that melt when heated by excessive current flow. A fuse wire consists of low melting point and high resistivity and it is always connected in livewire.