... , SGS, ISO9001, CCCleading manufacturerSWB, DBW Series of high Power Regulator includes three-phase and single phase, using international advanced Compensation Design, has features of high ... , capacitive, inductive) Regulators accuracy 1-5% Adjustable No overvoltage, undervoltage, phase sequence, with multiple protections.. SBW DBW 50KW three phase ac voltage regulator