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20kVA 3 Phase 380V to 440V Dry Type Voltage Converter Power Isolation Voltage Transformer Regulator Dry Type, Find Details and Price about Step Down Transformer 220V to 110V Isolating Transformer from 20kVA 3 Phase 380V to 440V Dry Type Voltage Converter Power Isolation Voltage Transformer Regulator Dry Type - Xi'an Feng Yu Industry Co., Ltd.