For correct installation use a multiple pole switch or relay as shown below.
多台执行器连接的正确方式是使用多级转换开关和继电器。
The three-pole switch was originally used to switch a voltmeter guard along with the signal lines.
三刀开关最早用于切换伏特计保护及信号线路。
The article describes the conditions in selection of four-pole switch, applicable site and points out the cautions in actual projects.
论述了四极开关选择的条件，应用场所，指出了在实际工程中应注意的问题。
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