The fuse in the low-voltage distribution system is a kind of electrical appliance, which is widely used in the protection of power grid and protection of electric equipment, when the power grid or power equipment has short-circuit fault or overload, it can automatically cut off the circuit, avoid the damage of electrical equipment and prevent the spread of accidents. Fuse is composed of insulating base (or supporting parts), contacts, melts, etc., the melt is the main part of the fuse, the melt is equivalent to a special wire in series in the circuit, when the circuit is short-circuit or overload, the current is too large, melt due to overheating and melting, thereby cutting off the circuit. The melt is often made of filiform, grating, or flaky form. The melt material has the characteristics of low melting point, stable characteristic and easy fusing. The general use of lead-tin alloy, silver-plated copper, zinc, silver and other metals.
In the process of melt cut off the circuit will produce an arc, in order to safely and effectively extinguish the arc, the melt is generally installed in the fuse shell, take measures to quickly extinguish the arc. The fuse has the advantages of simple structure, convenient use and low price, and is widely used in low-voltage system.
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