KYN28-12 armored metal-enclosed switchgear (new flat-top cabinet) meets the requirements ofGB3906, GB/T11022, IEC298 and DL/T404 standards. Suitable for 3.6-12kV AC three-phase 50Hz singlebus and single bus subsection power system, as the acceptance and distribution of electrical energyand control, protection and monitoring of the circuit. At the same time with a high degree of reliabilityof the chain device, fully meet the five requirements. It can be equipped with domestic VD4 centralvacuum circuit breakers made by VS1, VS1+, VSM and ABB. This product is for indoor use. Usage environment 1. Lower than 1,000 meters in elevation.2.Environmental temperature: +40°C as maximum, -10°C as minimum.3.Relative humidity: daily average value no higher than 95%, monthly average value no higher than90%.4.The surrounding air is not significantly polluted by corrosive gases, flammable gases, water vapor, etc.5.There is no frequent severe vibration.