知识拓展：（以下描述与产品无关，因产品太多，图片与实物不符，请谅解！）
工作原理 编辑
当电磁继电器线圈两端加上一定的电压或电流，线圈产生的磁通通过铁心、轭铁、衔铁、磁路工作气隙组成的磁路，在磁场的作用下，衔铁吸向铁心极面，从而推动触点常闭触点断开，常开触点闭合;当线圈两端电压或电流小于一定值时，机械反力大于电磁吸力时，衔铁回 到初始状态，常开触点断开，常闭触点接通。
那么，可以把汽车继电器看成是由线圈工作的控制电路和触点工作的主电路两个部分组成的集合体。在继电器的控制电路中，只有较小的工作电流，这是由于操纵开关的触点容量较小，不能用来直接控制用电量较大的负荷，只能通过继电器的触点来控制它的通断。
继电器既是一种控制开关，又是控制对象(执行器)。以燃油泵继电器为例，它是燃油泵的控制开关，但是燃油泵继电器的线圈只有在电控单元中驱动三极管导通时，才能通过电控单元的接地点形成回路。[1]
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