、当线圈通电后，铁心和衔铁被磁化，成为极性相反的两块磁铁，它们之间产生电磁吸力。当吸力大于弹簧的反作用力时，衔铁开始向着铁心方向运动。当线圈中的电流小于某一定值或中断供电时，电磁吸力小于弹簧的反作用力，衔铁将在反作用力的作用下返回原来的释放位置。
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