company news about What material is high-voltage fuse made of?

        As we know, the function of high-voltage fuse is to protect the circuit, that is, when the current in the circuit exceeds the specified value, the melt inside the fuse will generate a kind of heat to break the circuit. Therefore, for high-voltage fusing materials, the requirements are materials with low melting point and arc extinguishing characteristics, generally including copper, silver, zinc, lead, lead tin alloy and other materials.

        High voltage fuses are made of copper, silver, zinc, lead, lead tin alloy, etc. The melting points of these materials are also different, so different materials are required for different currents, and their fusing temperatures correspond to 1080 ℃, 960 ℃, 420 ℃, 327 ℃, and 200 ℃ respectively. Instructions for the use of these different materials are as follows:

        1. The melting point of zinc, lead, lead tin alloy and other metals is relatively low, but the resistivity is high. Therefore, the fuse to be used has a large sectional area and generates more metal vapor during fusing, which is not conducive to arc extinguishing and is mainly used in circuits below 1kV.

        2. Copper and silver have high melting points, low resistivity, and good electrical and thermal conductivity. Therefore, the fuse to be used has a small sectional area, and the metal vapor generated during fusing is also small, so it is easy to extinguish the arc. It can be used in high voltage and high current circuits. However, if the passing current is too large and the temperature is too high for a long time, it is easy to damage other components in the fuse. In order to fuse the melt rapidly, a large current must flow, otherwise the fusing time will be prolonged, which is unfavorable to the protection equipment. In order to eliminate this disadvantage, a tin or lead ball is usually welded on the copper or silver melt to reduce the melting temperature of the melt and improve the protection performance of the melt.