HDV (VS1) -31.5 Indoor AC high-voltage vacuum circuit breaker adopts the integrated design of operating mechanism and circuit breaker body. It can be used as a fixed installation unit or a special propulsion mechanism to form a handcart unit. Suitable for three-phase AC 50Hz, rated voltage of 10kV power system for switching of various types of loads and frequent operation occasions, can be used for industrial and mining, enterprises, power plants and substation electrical equipment protection and control.