lock-on relay

例句：

1. 1. The engineer used a lock-on relay to ensure that the circuit was properly closed.
   工程师使用了一个锁定式继电器来确保电路正确地闭合。
2. 2.The lock-on relay is crucial for maintaining the stability of the power system.
   锁定式继电器对于保持电力系统的稳定性至关重要。
3. 3.During the emergency, the lock-on relay automatically switched off the power supply to prevent further damage.
   紧急情况下，锁定式继电器自动关闭电源以防止进一步损坏。