The writer summarizes the cause of vacuum switching cutoff,and analyses the influence of circuit parameter on it ,such as the overvoltage,when the vacuum switch cuts off the induced charging circuit.

• 通过对真空开关截流成因的阐述，分析用真空开关切断感性负载电路时，电路参数对真空开关截流的影响，及由此产生的过电压危害.