Main performance index: 1.Drip-leak-proof structure:(IP22 or IP23 protection class) 2.Insulation class H or F 3.Rated voltage 400V or 440V 4.Three phases four poles(1500rpm/50HZ or 1800rpm/60HZ) 5.Adjusting rate of stable voltage<=1% 6.Transient state voltage<=-15%--+20% 7.Wave aberration rate of voltage THD<=3% 8.Telephone harmony wave factor THD<=2% 9.Telephone effective factor TIF<=50 10.Voltage of other range depends on the customer's request Power Range:6.5KW to 1000KW