pantograph isolating switch

例句：

1. 1. Thepantograph isolating switch is usedto isolate the circuit during maintenance.
   隔离开关用于维护期间隔离电路。
2. 2. The engineercarefully inspected the pantograph isolating switch before installing it.
   工程师在安装前仔细检查了隔离开关。
3. 3. The pantograph isolating switch was designed toprevent electrical shocks during operation.
   隔离开关的设计旨在操作过程中防止电击。