“自动—手动”开关是在自动控制领域里为方便调试及维修而设置的一种功能转换开关，手动档是通过按钮开关来发出启、停或指导信号；自动档用于过程自动控制，由各种行程开关、凸轮撞块机械开关时间继电器、压力电器、计数电器等动作来实现过程的自动进行。在各种自动控制系统 Automatic-manual switch is a kind of function switch which is set in the automatic control field for the convenience of debugging and maintenance. The manual gear sends the start, stop or guide signal through the button switch. The automatic gear is used for the process automatic control. A variety of travel switches, cam switch block mechanical switch time relay, pressure electrical appliances, electrical appliances and other activities to achieve the countdown automatically. In a variety of automatic control system