KYN28A-12 armored mounted metal-enclosed switchgear is the introduction of ABB's advanced design and manufacturing technology on the basis of their own design and development of new products that can replace all the old type of armored metal enclosed switchgear, the product has the following obvious Features: 1. product housing is made of aluminum zinc coated steel sheet after molding CNC machining assembled with bolts with high mechanical strength, effectively ensure the accurate and beautiful appearance, doors are coated with electrophoresis paint, then baked on a vitreous enamel has high impact resistance, corrosion resistance. Products has IPX4 protection rating. 2. The main switch can be configured to ABB companies producing withdrawable VD4 vacuum circuit breaker, C3 series of fixed load switch, HA-type SF6 circuit breakers and vacuum contactors can also be configured VS1 vacuum circuit breakers. 3.VS1 vacuum circuit breaker VD4 its chassis vehicle similar to Universal, the conductive part of the structure and VD4, vacuum using VD4 series vacuum switch, an electromagnetic actuator and spring operated primary type available. Its cost is appropriate. 4. Whether the choice of the kind of circuit breaker, which can guarantee the air insulation distance is greater than 125mm. Various circuit breakers have a long life, high-parameter, less maintenance, small size and unique advantages. KYN28A-12 armored mounted metal-enclosed switching equipment for 3.6-12KV phase AC 50Hz power grid, as the acceptance and distribution of electric energy, and circuit implementation of control, monitoring and protection purposes, it can be used in single busbar systems or dual bus sub-systems. Product precedent IEC298 "rated voltage 10KV ac metal-enclosed switchgear IEC standards", IEC649 "high-voltage switchgear and control equipment sharing clause" of GB3906. "3-10KV AC metal-enclosed switchgear" and DL404 "Indoor AC switch over voltage 3KV equipment" and other standards. And has a perfect and reliable "Five Anti" lockout feature.