rated primary voltage

例句：

1. 1. The powersupply is rated at 2000 volts.
   电源的额定电压为2000伏特。
2. 2. The circuit breaker has a rated primary current of50 amperes.
   断路器的额定初级电流为50安培。
3. 3. The ratedprimary voltage for this transformer is10 kV.
   这个变压器的额定初级电压为10千伏。