Vacuum circuit breaker case materials are mainly plastic, metal and ceramic. Plastic shell lightweight, good insulation, but lower strength; metal shell high strength, high temperature resistance, but heavier; ceramic shell insulation, high temperature resistance, but easy to break. Selection needs to be based on the use of the environment, working conditions and other comprehensive consideration.
Vacuum circuit breaker is a switching device used to control the amount of current in the circuit, and the selection of its shell material has an important impact on the performance and service life of the circuit breaker. At present, the common circuit breaker shell materials on the market are mainly plastic, metal and ceramic.
1. plastic shell
Plastic shell is a material widely used in low-voltage circuit breakers. Commonly used plastic materials are ABS, PC, PA, etc., they have the advantages of lightweight, good insulation properties, strong shock resistance. In addition, plastic housings also have good processing performance and low cost, making plastic circuit breakers highly competitive in the market. However, the strength of the plastic casing is relatively low, and it is susceptible to mechanical shock and high-temperature environments, which may lead to deformation or even melting. Therefore, when choosing vacuum circuit breaker with plastic casings, it is necessary to give full consideration to their use environment and working conditions.
2.metal shell
Metal casing is mainly used for high-voltage vacuum circuit breaker, such as cast aluminium, stainless steel and so on. Metal casing has high strength and good high temperature resistance, which can effectively prevent the external environment from damaging the circuit breaker and improve the reliability of the circuit breaker. At the same time, the metal shell also has good electrical conductivity, which is conducive to the transmission of current and heat dissipation. However, the metal casing is heavier, has a higher manufacturing cost, and requires good anti-corrosion treatment. Therefore, when choosing a circuit breaker with a metal casing, it is necessary to comprehensively consider its performance, cost and use of the environment and other factors.
3.ceramic shell
Ceramic shell is mainly used for high-voltage circuit breakers, surge arresters and other equipment. Ceramic materials have excellent electrical insulation, high temperature resistance and mechanical strength, can maintain stable performance in harsh operating environments. In addition, ceramic housings have good corrosion resistance and long service life. However, the ceramic shell is easy to break, not easy to process, and the cost is high. Therefore, when choosing vacuum circuit breaker with ceramic shells, special attention needs to be paid to the safety issues during their installation and use.
The selection of vacuum circuit breaker shell material needs to be considered according to the use environment, working conditions and other comprehensive factors. In the selection process, priority should be given to key indicators such as insulation performance, high temperature resistance and mechanical strength of the material to ensure the safe and reliable operation of the circuit breaker.
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