| HK-OPB Easy to connect as HK-OPB type which can separate upp-er board after separation.Easy to adjust size acoording to place, capacity of Transformer.ApplicationIndustrial transformer controlling main power supply of constructions and other equipments.HK-DOBEasy to check and settle as HK-DOB TYPE which can open all sides after opening front door.Applocation Industrial transformer controlling main power supply of constructions and other equipments.HK-STB It is made by ourselves as HK-STB TYPE on the purpose of the step-up and down od common power-voltage. | 
