OEM Signal Generator Change over Switch 1,stamford type of AC generator 2,advanced AVR 3,good after-sale service, ... safe OEM Signal Generator Change over Switch1,stamford type of AC generator2,advanced AVR3,good after-sale service,safe SZN ... ,415V,etc.3) Rated frequency: 50 / 60Hz4) Rated speed: 1,500 / 1,800rpm5) Three-phase four-wire6) Protection: I5P21- IP237) Insulation ...