TheVS1-12indoor high-voltagevacuum circuit breaker is an indoor switchgearfor three-phaseAC50Hzpowersystems witha ratedvoltage of12kV.It serves as a protection and controlunit for powergrid equipment and industrial and miningenterprisepowerequipment.Suitable forplaces that require frequent operation at rated working current,ormultiple disconnections ofshort-circuit current.The circuit breaker adopts an integrated design ofthe operating mechanism and the circuit breaker body,which can be used as a fixed installation unit orequipped with a dedicated propulsion mechanism to form a handcartunt.