KYN28-12 indoor AC metal armored withdraw able switch gear is used for power plant transmission, power system, and industrial and mining enterprise substation receiving, distribution, control, and protection purposes. It can also be used for frequent starting of high-voltage motors, meeting the "five prevention" interlocking requirements. The switch gear can be equipped with A BB's VD4 vacuum circuit breaker or domestic VS1 vacuum circuit breaker, making it a high-performance distribution device with flexible scheme combination, compact structure, safety and reliability, easy maintenance, impact resistance, corrosion resistance, and other advantages.