Johsun power SBW-50 KVA voltage stabilizer has three phase, 304V-456V voltage range, 50Hz / 60Hz voltage stabilizer frequency, 318V ± 7V low volt, 426V ± 7V over volt, natural cooling system, auto / manual by pass, 95% AC-AC, 95% noise level, 5-60 degree C temperature, 1860 kg voltage stabilizer weight.