... . with ten years manufacturing expearience 2. durable,low losses 3.customized 4.ISO&CE three phase step down transformer :ISO&CE 1Input ... )9Height level,≤3000M10High voltage test,1 minute no breakdown under 2.5KV voltage11Noise,≤40 db12Cooling way,Air coolingWind direction,the wind ... air hole13Connection Symbol, Y type Dry-type three phase step down transformer