1.GB/T17467 SD320 IEC61330 2.CE CQC CCC ISO9001 ISO14001 OHSAS 18001 BV 3.high integration, small size, safe 1. CompositionThe covering material are: colored steel plate, cold rolled plate, stainless steel, glass-fabric special cement, aluminum alloy and copper aluminum zinc plate. The insulating medium of medium voltage switch device: SF6, atmosphere and vacuum. Transformer: oil and dry mode. ...