... complete power distribution device for 3.6~24kV,3-phase AC 50Hz,single-bus and single-bus sectionalized system. It is ... system of factories, mines and enterprises, and starting of large high-voltage motor, etc.,so as to control, protect and monitor the ... ,GB3906-91.In addition to be used with domestic VS1 vacuum circuit breaker, it can also be used with VD4 from ABB,3AH5 ...