... step down transformer :ISO&CE 1Input voltage; three phase 380VAC2Output voltage; three phase 220VAC3 Frequency,50-60Hz4Power,40KVA5Load capacity, 100%6Insulation,H ... ,1 minute no breakdown under 2.5KV voltage11Noise,≤40 db12Cooling way,Air coolingWind direction,the wind enter from right side,but ... all around dispersing air hole13Connection Symbol, Y type Dry-type three phase step down transformer