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Reliable 11/0.4kv 3 Phase 500kVA Step Down/up Electrical Transformer Industrial Threep Hase Transformer, Find Details and Price about Transformer Electrical Transformer from Reliable 11/0.4kv 3 Phase 500kVA Step Down/up Electrical Transformer Industrial Threep Hase Transformer - Jiangsu Hengda Transformer Co., Ltd.