power disconnecting switch

例句：

1. 1.The power disconnecting switch is used to turn off the main power supply when necessary.
   电源断开开关用于在必要时关闭主电源。
2. 2.The engineer found a faulty power disconnecting switch and fixed it immediately.
   工程师发现一个断路的电源断开开关并立即修复了它。
3. 3. During maintenance, the technician had to disconnect the power disconnecting switch to access the circuit.
   在维护期间，技术人员必须断开电源断开开关才能访问电路。