... , Servo drives.0.75kw-630kw inverters with input and output voltage 220V, 380V, 460V, and 690V.(fluctuating 15%)0. ... come from Germany, Japanese and Qinghua University.Powtran annual output is substantial, about 100000 to 120000 PCS. Few factories ... China Best regards..Yours FaithfullyJason Bournewww.powtran.com variable voltage and frequency and variable speed frequency converter inverter ac drives ...