![]() This heavy current can be much more than the normal rated current. The rated current is approximately half of the fusing current.įusing factor = Minimum fusing current / Rated current of the fusing element It means the value of current at which the fusing wire melts when current passes through it even for a fraction of second. This rated value also depends upon types of the fuse holder, temperature, and fuse contacts. If the fuse of proper rating is not provided in the circuit and any fault develops due to overload or short circuit, the flow of heavy current will heat up the wires and fire may take place.īy rated current, we mean the current that can be carried safely for an indefinite period without undue heating and melting the fuse wire.The size of the fuse wire should be based on the value of current and not on the melting current value.The fuse is to be put in the live wire (+ve phase) in the mainboard and at the sub-branches.Specification of Electrical Fuseįollowing points should be noted before installing an electrical fuse in an electric circuit. This in turn protects the insulation of the wire, machine, or appliances from overheating and damage. Shortly, it can be stated that the fuse is a device used to prevent overheating due to excessive current. Otherwise, the wiring and the appliance will be damaged due to the excessive flow of the current in the circuit. This is how the wiring or any appliance is protected. ![]() The damages due to this overcurrent can be limited by a short length of wire known as an electrical fuse.Īn electrical fuse automatically melts due to this excessive current, and thus the circuit is broken. This happens due to any one of the following reasons. Sometimes current drawn by a machine or appliance connected in that circuit gets exceeded from the rated (predetermined) value. We all connect different types of machines to an electric circuit. As the current increases beyond a limit, the wire in the electric fuse melts and breaks off. It consists of a piece of wire called fuse wire made of a metal or an alloy of low melting point. Fuses work on the principle of heating effect of current. ![]()
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