KYN28A-12(GZS1-12) indoor AC metal-clad with-drawable switchgear (Hereafter referred to as switchgear) is an advanced medium-voltage switchgear, developed by Xian senyuan corporation, is suitable for the applications in three phase AC electric power system with rated voltage of 12kV and rated frequency of 50Hz, for the acceptance and distribution of the power, and also provide control, protection, and monitor of the circuit.