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HXGN-12箱型固定式金屬封閉開關柜（簡稱環網柜）適用于交流50Hz，12KV的網絡作為開斷負荷和短路及關合短路電流用。本環網柜配用手動、電動彈簧機構來操作負荷開關，接地開關和隔離開關配用手動操作機構。

HXGN-12 tank fixed type metal enclosed switchgear(ring main unit)is used for A.C 50Hz,10kV network as broken loading, short-circuit and closing short-circuit. The ring main unit equiped with manual/electromagnet spring charged operated mechanism to operate loading switch, earthing switch and isolating switch equiped with manual operated mechanism.