Single - phase and three - phase available. Widely applied to various fields, locomotive cars, such as power supply, medical instruments, welding machines, textile machinery, communication and electronic products. Capacity range: 30kVA to 1000kVA (there are 15 kinds of products ). Three - phase enclosed distribution transformer with rolled iron core. Conformable standards: GB1094 and GB / T6451 . With high mechanization, the iron core is of three - phase, three - column and rolled inner and outer frame. The HV and LV coils winding continuously and tightly around the iron core column, good concentricity. Our S11 - M. R - 30 TO 1000 / 10 Series Three - phase Enclosed Distribution Transformer comply with International Quality Standards and their quality and durability are fully guranteed. Converts 110/120 V to 220/240 V OR converts 220/240 V to 110/120 V (switch is on back of unit). 4 outlets on front of unit accepts grounded or non grounded plugs from any country. Insulated power cord is hard wired with a grounded European Shucko plug also good for Asian outlets. Easy to carry with attached handle, heavy-duty metal casing. FUSE PROTECTED.