The KYN28-24(Z) series armored withdrawable AC metal-enclosed switchgear (hereinafter referred to as "switchgear") is a complete set of distribution equipment for 20kV three-phase AC 50(60)Hz single busbar and single busbar sectional systems. It is mainly used in power plants, medium and small generator power supply, distribution for industrial and mining enterprises, and secondary substations in power systems for receiving and transmitting electricity, as well as starting large high-voltage motors. It is used for control, protection, and monitoring. This switchgear has the "five-proof" interlocking functions, which prevent the withdrawal of the circuit breaker under load, prevent mistaken opening or closing of the circuit breaker, prevent closing the circuit breaker when the grounding switch is in the closed position, prevent entering live compartments by mistake, and prevent faulty closing of the grounding switch when energized. It can be equipped with the VS1-24 type vacuum circuit breaker developed and trial-manufactured by our company, making it an excellent performance distribution device. The product complies with standards such as GB 3906, GB/T 11022, and IEC 60298.