dirctional circuit-breaker

例句：

1. 1.The directional circuit-breaker is designed to protect the power grid from faults.
   定向断路器的设计是为了保护电网免受故障影响。
2. 2.The new directional circuit-breaker has a longer lifespan than its predecessors.
   新型定向断路器的使用寿命比前代产品更长。
3. 3.The directional circuit-breaker was installed in the substation to prevent power outages during peak demand periods.
   在变电站安装定向断路器，以防止高峰需求期间的电力中断。