... transformer 1) Frequency; 50hz/60hz 2) Phase, 3-phase,isolation 3)ISO9001/2008.CE.CCC 3-phase dry type isolation transformerApplication; Our transformer ... IEC439, JB55555, GB226 and inland standard.Feature;SG series 3-phase dry type transformer comprehensive used in AC 50-60HZ, ... input and output, connection symbol, rating of winding, rectifier curcuit, weather with iron case or not, to satisfied ...