DC high speed circuit-breaker

例句：

1. 1. TheDC high-speed circuit breaker is used to protect the power grid from overload.
   直流高速断路器用于保护电网免受过载。
2. 2.The engineers are working on a new design for the DC high-speed circuit breaker.
   工程师们正在为直流高速断路器设计一个新的型号。
3. 3.The DC high-speed circuit breaker has been tested under extreme conditions and passed all safety tests.
   直流高速断路器在极端条件下进行了测试，并通过了所有安全测试。