KYN61-40.5 armored removable AC metal-enclosed switchgear (hereinafter referred to as switchgear) is suitable for three-phase AC 50Hz, 40.5kV single-bus and single-bus segmented power systems. It is mainly used in power plants, substations, industrial and mining enterprises, and high-rise buildings. It is used for receiving and distributing electrical energy, and controls, protects and monitors the circuit to meet the requirements of IEC60298, GB3906, DL404 and other standards, and has perfect “five defense” functions.