KYN28A-12 series switchgear is a piece of complete distribution equipment used for 3-12kv three-phase AC 50Hz single bus-bar sectioning system. It is mainly applied to transmitting of medium or small-size motor, distributing in the industrial and mining enterprise, receiving and transmitting electricity, in addition, starting large-size HV motor in the secondary transformer substation, etc, to realize control, protection and monitor.