KYN28A-12 type switchgear is the same type of switchgear on the basis of the original, through the improvement, digestion of similar domestic and foreign latest cabinet type, configuration of excellent performance of the new VS1, VD4 and other vacuum circuit breakers in the switchgear, this type of switchgear from the structure, circuit breakers and other performance refers to all superior to other cabinet type, is currently the highest rate on the domestic figure, the most widely used switchgear. It is widely used in power plants, substations, factories, mines and medium-sized commercial and civil buildings.