The KYN28A-12 indoor AC high-voltage metal-enclosed switchgear is a complete indoor power distribution system designed for three-phase AC 50Hz, rated voltage 12kV, and working current up to 4000A. It is suitable for power plants, sub-stations, industrial and mining enterprises, etc., for the purpose of receiving and distributing electrical energy, providing control, protection, and monitoring of the circuit, and is suitable for locations requiring frequent operation.