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A fuse or fuse wire used in domestic electrical appliances is a type of low resistance resistor that acts as a sacrificial device to provide over-current protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Short circuits, overloading, mismatched loads, or device failure are the prime reasons for excessive current. Fuses are generally made of metals or alloys of zinc, copper, aluminium, etc. having a low melting point. Under normal operating conditions it is designed to carry the full load current. If the current increases beyond this designed value due any of the reasons mentioned above, the fuse melts (said to be blown) isolating the power supply from the load.