cut-off relay

例句：

1. 1.The circuit breaker protects the electrical system from damage during a power outage.
   电路断路器在停电时保护电气系统免受损坏。
2. 2.The engineer used a cut-off relay to switch off the power supply to the building.
   工程师使用断路继电器来关闭建筑物的电力供应。
3. 3. During maintenance, the technician had to cut-off the relay to access the wiring.
   维护期间，技术人员必须切断继电器才能接触电线。