The fuse is mainly composed of a melt, housing, and support 3, wherein the melt is a key element that controls the fuse characteristics. The material, size and shape of the melt determine the fuse characteristics. The melt material is divided into two categories of low melting point and high melting point. Low melting materials such as lead and lead alloys, the melting point is low, due to its large resistivity, so that the melt is large, the metal vapor generated when the fuse is melt, only suitable for low-breaking capability . High melting materials such as copper, silver, the melting point is high, is not easy to blow, but due to the low resistivity, the small melting is small, the metal steam generated is small, which is small, suitable for high break Ability of fuses. The shape of the melt is divided into filaments and strip shapes. The shape of changing the variable cross section can significantly change the fuse characteristics of the fuse. The fuse has a variety of different fuse characteristic curves that can be applied to the needs of different types of protection.
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