The HXGN17-12 box-type fixed AC metal-enclosed switchgear (referred to as the ring main unit) has a rated voltage of 12kV and a rated frequency of 50Hz. It is an AC high-voltage electrical device mainly used in three-phase AC ring networks, terminal distribution networks and industrial electrical equipment to receive, distribute electrical energy, and perform other functions. It is also suitable for being installed in box-type substations.