举一个例子，某一条线路带一个小型电机，电机开5分钟停5分钟；这要在线路的出口安装断路器，当电机出现问题时及时跳闸，在电机的电源入口处串入接接触器，用它实际控制电机的开、停，用继电器组成5分钟延时电路，来控制接触器。
脱扣器、接触器、断路器的区别是什么?
脱扣器是开关断路器或者是热继电器里面的一个机构，通俗的说就是监控电路的某些量到达一定程度的时候就触发机关脱扣，目的是去控制电路的分断。
接触器分为交流接触器（电压AC）和直流接触器（电压DC），它应用于电力、配电与用电。接触器广义上是指工业电中利用线圈流过电流产生磁场，使触头闭合，以达到控制负载的电器。鸿飞达-李工hongfeida137
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