A fuse is an electrical defense component. It provides protection to the overcurrent. It does its best to protect the electrical circuits and sacrifice itself in the event of overcurrent. When the current flows through the fuse metal element. It generates heat due to resistance, which dissipates in the atmosphere. If somehow, due to any reason, the current starts to flow high. It will generate more heat in the metal element of the fuse. So, the metal element of the fuse will not bear such a high amount of heat. As a result, the fuse element will start to melt and blow out. This melting will discontinue the electric current flow and separate the circuit from the power source. Thus, a fuse protects the whole circuit by melting itself.