Basically, a fusible insert is intended to save electrical devices from overheating or closure. Having a smaller cross section (in comparison with other elements) and greater resistance, it heats up more when passing the current than other links, as a result of which it begins to melt without incapacitating the electrical appliance. In some cases, the molten plate is mounted in electrical equipment. For example, it is present in lighting lamps and helps to prevent overloading of the power grid in cases where the filament burns.
Practically a fusible insert is an easy-to-melt conductor of a kind of wire or plate shape. So, in radio electronics devices, the fuse has the following structure: either wire or a fuse is placed in a glass or porcelain tube, which is based on zinc tape, which is easily melted. In addition, zinc is a corrosion resistant metal.
The structure of the plate is such that wide and narrow links alternate. The narrowed ones burn faster, which does not allow the current to increase with a short circuit.
In order to lower the melting threshold of the plate, parallel branching is performed. In separate models of fuses, the insert is in the form of a spiral and consists of copper wires slightly covered with silver. When extinguishing an arc that occurs in different areas at the same time, both fuse inserts show effectiveness.