描述
当线圈通电时，电磁铁产生磁力，吸引衔铁，使常闭触点断开，常开触点闭合。线圈电流消失后，复位弹簧使衔铁返回原来的位置，常开触点断开，常闭触点闭合。图l-2b是继电器的线圈、常开触点和常闭触点在电路图中的符号。一只继电器可能有若干对常开触点和常闭触点。在继电器电路图中，一般用相同的由字母、数字组成的文字符号(如KA2)来标注同一个继电器的线圈和触点。
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