company news about Structure and function of fuse

        Generally, the fuse consists of three parts: melt part, electrode part and bracket part.

        The first is the melt part, which is the core of the fuse and plays the role of cutting off the current when it is fused. The melt of the same type and specification of fuse should have the same material, the same geometric size, and the resistance value should be as small and consistent as possible. The most important thing is that the fusing characteristics should be consistent;

        The second is the electrode part, which usually has two parts. It is an important part for the connection between the melt and the circuit. It must have good conductivity and should not produce obvious installation contact resistance;

        The third is the support part. The fuse melt is generally thin and soft. The support is used to fix the melt and make the three parts into a rigid whole for installation and use. It must have good mechanical strength, insulation, heat resistance and flame retardance. It should not have fracture, deformation, combustion and short circuit in use;

        Fuses used in power circuits and high-power equipment include not only three parts of general fuses, but also arc-extinguishing devices, because the circuit protected by such fuses not only has a large working current, but also has a high voltage at both ends when the melt is blown. It is often that the melt has melted (fused) or even vaporized, but the current is not cut off. The reason is that at the moment of fusing, under the action of voltage and current, Arc pulling occurs between the two electrodes of the fuse. The arc-extinguishing device must have strong insulation and good thermal conductivity, and be negative. Quartz sand is a commonly used arc extinguishing material.

        In addition, there are some fuses with fusing indication devices, whose function is to make certain appearance changes after fuse action (fusing), which are easy to be found by maintenance personnel, such as lighting, discoloration, pop-up solid indicator, etc.