blanking-off plug

例句：

1. 1. This plug is designed to blockthe flow of electricity when the switch isturned off.
   这个插头设计成在开关关闭时阻断电流。
2. 2. The technician had toremove the plug from the socket to replaceit.
   技术人员不得不从插座中取出插头来更换它。
3. 3. The power company provided ablanking-off plug for the newsubstation.
   电力公司为新变电站提供了断路插头。