What is the structure of the fuse tube? What is the effect of each? What is the requirement?
The general fuse pipe is composed of three parts: one is the melt part, it is the core of the fuse tube, it plays the role of cutting off the current when the fuse is broken. The same type and the same type fuse tube melt, the material should be the same, the geometric size is the same, the resistance value is as small as possible and should be the same, it is important that the fuse characteristic be consistent. The two is the electrode part, usually two. It is an important part of the connection between the melt and the circuit. It has good electrical conductivity and should not produce an obvious mounting contact resistance. Three is the support part. The fuse of the fuse tube is generally fine and soft. The function of the stent is to fix the melt and make the three parts rigid. It is easy to install and use. It should have good mechanical strength, insulation, heat resistance and flame retardancy. It should not produce breakage, deformation, combustion and short circuit in use;
The fuse tube used in electric power circuit and high power equipment not only has three parts of the general fuse tube, but also has an arc extinguishing device, because the circuit protected by this kind of fuse tube is not only high in working current, but also high in the voltage at both ends of the melt when the melt breaks. ) even vaporization, but the current has not been cut off, the reason is that in the fuse of the instantaneous voltage and current under the action of the fuse tube between the two electrodes occur between the phenomenon of arc. The arc extinguishing device must have strong insulation and good thermal conductivity and negative electricity. Quartz sand is a commonly used arc extinguishing material.
In addition, there are some fuse tubes have a fuse indicator, its function is when the fuse tube action (fuse) itself has a certain appearance changes, easy to be found by the maintenance personnel, such as: light, discoloration, and pop out of the solid indicator.