change-over relay

例句：

1. 1. The change-over relayis responsible for switching the power from onecircuit to another.
   换向继电器负责将电力从一个电路切换到另一个电路。
2. 2. The engineers had to change-over relay thesystem to accommodate the new requirements.
   工程师们不得不更换继电器系统以满足新的需求。
3. 3. During thepower outage, the change-overrelay was used to switch off the mainpower supply.
   在停电期间，使用了换向继电器来关闭主要电源供应。