double-pole switch

例句：

1. 1. The double-pole switch is used to control the flow of electricity.
   双极开关用于控制电流的流动。
2. 2.The double-pole switch has a simple design that makes it easy to install.
   双极开关设计简单，易于安装。
3. 3. The double-pole switch is essential for ensuring safe electrical connections.
   双极开关对于确保安全电气连接至关重要。