Use and maintenance of fuses

The fuse in the low-voltage power distribution system is a kind of electrical appliance that plays a role of safety protection. The fuse is widely used in the protection of power grids and electrical equipment. When the power grid or electrical equipment is short-circuited or overloaded, it can automatically cut off the circuit to avoid electrical appliances. The equipment is damaged to prevent the accident from spreading.
The fuse consists of an insulating base (or support), contacts, melt, etc. The melt is the main working part of the fuse. The melt is equivalent to a special wire in series in the circuit. When the circuit is short-circuited or overloaded , The current is too large, the melt will melt due to overheating, thereby cutting off the circuit. The melt is often made into filaments, grids or flakes. The melt material has the characteristics of relatively low melting point, stable characteristics, and easy fusing. Metals such as lead-tin alloy, silver-plated copper sheet, zinc, silver, etc. are generally used. In the process of melting and cutting off the circuit, an arc will be generated. In order to extinguish the arc safely and effectively, the melt is generally installed in the fuse housing and measures are taken to quickly extinguish the arc.
The fuse has the advantages of simple structure, convenient use, low price, etc., and is widely used in low-voltage systems.