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Dry powder pressing fuse mold composition requirements and low resistivity

Jun 20, 2019

When the dry powder pressing fuse mold is used, its rated current is not equal to the rated current of the fuse. The rated current of the melt is selected according to the load current of the protected equipment. The rated current of the fuse should be greater than the rated current of the melt, and it is determined with the main electric appliance.

The dry powder press fuse mold is mainly composed of a melt, a casing and a support, wherein the melt is a key component for controlling the fuse characteristics. The material, size and shape of the melt determine the melting characteristics. Melt materials are classified into two types: low melting point and high melting point. Low melting point materials such as lead and lead alloys have a low melting point and are easily melted. Due to their high electrical resistivity, the cross section of the melt is large, and the metal vapor generated during the fusing is large, which is only suitable for the breaking of low breaking capacity. Device.

High melting point materials such as copper and silver have high melting point and are not easily melted, but because of their low electrical resistivity, they can be made into smaller cross-sectional sizes than low melting point melts, and generate less metal vapor during melting, which is suitable for high breaking. The ability of the fuse. The shape of the melt is divided into two types: filament and ribbon. Changing the shape of the variable cross section can significantly change the fuse characteristics of the fuse. Fuses have a variety of different fuse characteristics that can be adapted to the needs of different types of protected objects.www.yxhgmould.com