1.CM3B、CM3L、CM3V、CM3R换向所需的外力由外部机构提供,可用于位置测试或行程开关;2.CM3PF、CM3PM、CM3PL、CM3HS、CM3HD、CM3Y为手动操作,具有多种结构形式的控制接头,适用于不同工况;3.它是封闭结构。内圈密封性好,换向灵敏,无需润滑;4.多安装方式,安装使用方便;5.The control joint of series of CM3L, CM3V, CM3R and CM3Y are made of metal which has longer service life and more reliable and steady performance. 6. CM3PMS. CM3PMX Series have metallic guard, it can protect the push cup, to avoid misact due to outside force touching the push cup. So they can be used more reliably.