KYN28A-12 indoor AC high-voltage metal shift switchgear is a complete set of indoor power distribution equipment with three-phase AC 50Hz, rated voltage 12kV and working current up to 4000A. It is suitable for power plants, substations, industrial and mining enterprises, etc., as the use of accepting and distributing electric energy, the circuit plays the function of control protection and monitoring, and can be used in the place of frequent operation.