In the high-voltage power switch, the vacuum switch tube is a very core component, which can protect the circuit and reduce the occurrence of accidents and accidents. Today, the editor will introduce the knowledge of the classification, materials and service life of this component for everyone.

product category

At present, the more common vacuum switch tubes on the market are divided into two types, one is glass material and the other is ceramic material. Among them, components made of ceramic materials are widely used.

product material

1. Materials of dynamic and static contacts: The materials of this part can be divided into several types. The more commonly used ones are copper-tungsten alloy, copper-bismuth alloy and copper-chromium alloy. Among them, copper-chromium alloy is used more frequently.

2. The material of the conductive rod: the rod is generally made of oxygen-free copper. The oxygen-free copper material does not contain oxygen or other deoxidizer residues. It belongs to a kind of pure copper. An obvious feature of the material is no hydrogen embrittlement, high electrical conductivity, good corrosion resistance and low temperature resistance.

3. Shielding cylinder material: usually made of stainless steel, oxygen-free copper, stainless steel, copper-chromium alloy or electrical pure iron.

4. Corrugated pipe material: mainly made of stainless steel, the thickness of stainless steel is 0.1 ~ 0.2mm.

service life

The service life of the vacuum switch tube includes three types of vacuum life, mechanical life and electrical life. The vacuum life of good quality products can reach 20 years. The length of the mechanical life is directly related to the bellows, and the general mechanical life is generally 6000 to 20000 times. The electrical life is related to the breaking times of the rated short-circuit current.

The classification, material and service life of vacuum switch tubes are introduced here. When users use this component, they should make a reasonable choice and replace it in time when the service life reaches the limit.