This product is applied for winding equipments of metallurgy, petro-chemical, textile, plastic, wire & cable, paper-making, boiler, derrick, machine tools and general machinery industries. It can ensure the variation of tension and linear velocity of the reel in the allowed range when its diameter keeps changing from the beginning to the end. 1.Rated Input Voltage(main return circuit) :3-Phrase 380V ?10%,50HZ?% 2.Cooling Ventilator : Single-Phrase 220V?0%,50HZ 3.Maximum current(blocking current) :1A-200A(other specification of current should be stated on order sheet)