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It has the advantages of small size, light weight, suitable for frequent operation, arc extinguishing without maintenance, and is widely used in distribution network. Vacuum circuit breaker is the indoor distribution device of 3-10kV, 50Hz three-phase AC system, which can be used as the protection and control of electrical equipment in industrial and mining enterprises, power plants and substations. It is especially suitable for the use of places requiring no oil, less maintenance and frequent operation. The circuit breaker can be configured in the middle cabinet, double cabinet and fixed cabinet as the control and protection of high voltage electrical equipment
