Vacuum interrupter also known as vacuum switch tube, is the core component ofhigh voltage power switch. Its main function is to cut arc off throughexcellent insulation of vacuum in high voltage circuit and restrain current quickly to avoid accidents and danger. It is mainly used in electric power transmission and distribution control system, also used in metallurgy, mining, petroleum, chemical industry, railways, broadcasting, communications, industrial high frequency heating power distribution system. It is characterized by energy saving, material saving, fire prevention, explosion proof, small volume, long life, low maintenance cost, reliable operation and non-pollution. Vacuum interrupter can be divided into two kinds, one for circuit breakers and the other for load switch. The vacuum interrupter for circuit breakeris mainly used for substation and power grid facilities in the power sector, and vacuum interrupter for load switch is mainly used for end users of the power grid.