over power relay

例句：

1. 1. The over-current relay was triggered by the sudden surge in electricity usage.
   过载继电器因突然增加的用电量而触发。
2. 2. The overload relay prevented the system from overheating.
   过载继电器防止了系统过热。
3. 3. The engineers used the over-current relay to detect and isolate faulty circuits.
   工程师们使用过载继电器来检测和隔离故障电路。