company news about What are the characteristics of high breaking capacity fuses?

        A high breaking capacity fuse is a fuse that is fused in a ceramic tube (or glass fiber tube) filled with quartz sand and uses quartz sand as the arc extinguishing medium.

        The melt is installed in a porcelain tube (or glass fiber tube) filled with quartz sand, and the quartz sand is used as the arc extinguishing medium for the fuse. The particle size of quartz sand has a significant impact on arc extinguishing performance, and the particle diameter is generally selected in the range of 0.2 to 0.3 mm. When an overload current or short circuit current passes through the fuse, the melt melts and generates an arc in the tube. Due to the strong cooling and deionization effects of quartz sand on the arc, the arc quickly extinguishes. When breaking large short-circuit currents, the arc can usually be extinguished before the short-circuit current reaches its maximum value. During the entire process of breaking current, there is no sound and light phenomenon, and there is no ionized gas emission. With high breaking capacity, it is widely used in indoor high-voltage and low-voltage power distribution devices, as well as in household appliances. In addition, a fast fuse is also made for protecting semiconductor component devices.

        The melt of high breaking capacity fuses is usually made of copper or silver. When the rated current is low, the melt is often made into a filament; When the rated current is large, it is made into a variable cross-section shape. Because copper and silver are both high melting point metal materials, in order to reliably break the current under overload current, low melting point metals such as tin or cadmium alloys are often welded at certain intervals in the melt to reduce the melting temperature. This effect is also known as the metallurgical effect (M effect). The quick fuse in the protective semiconductor component device is basically the same in structure as the general high breaking capacity fuse, but does not use the metallurgical effect. The melt is made of silver material, with a variable cross-section shape, and its narrow neck part has a high current density to achieve the effect of rapid breaking.