【Abstract】 Utilize vacuum to call the vacuum circuit breaker as the insulating circuit breaker killing the arc means。According to giving the technical parameter definitely, correct and rational choice and design vacuum kill the structure form of arc room. The design principle of the main return circuit must guarantee it is qualified that the electric apparatus moves hot stability , with conductive board and as the main fact design that electric conduction lead. The design of the insulator should have certain machinery and electric intensity, namely the voltage of puncture of the insulator is greater than flashing to hold 50% of voltage in place with a net. Electronic stability check-up for to move steady electric current greater than three-phase short out in the electric current conductive board principle, and internal stress should be smaller than letting to use the stress。Hot stability check-up principle is it can is it short out for conductive board and electric conduction the heat effect of the electric current is unlikely to damage to bear to take, short out ShengXiao Wen that stop on most heavy to generate heat warm to rise. Is it move design principle of organization for guarantee circuit breaker can the accurate equal to the floodgating in time to speak, keeping shutting the floodgate, divide the floodgate , freedom is taken off and deducted, defend and jump and restored to the throne the function of the chain.
【Key words】 vacuum circuit breaker; interrupter; design of the main return circuit；move hot stability check-up
