交流接触器利用主接点来开闭电路，
用辅助接点来导通控制回路。
主接点一般是常开接点，而辅助接点常有两对常开接点和常闭接点，小型的接触器也经常作为中间继电器配合主电路使用。
交流接触器的接点，由银钨合金制成，具有良好的导电性和耐高温烧蚀性。
交流接触器动作的动力源于交流通过带铁芯线圈产生的磁场，电磁铁芯由两个「山」字形的幼硅钢片叠成，其中一个固定铁芯，套有线圈，工作电压可多种选择。为了使磁力稳定，铁芯的吸合面加上短路环。交流接触器在失电后，依靠弹簧复位。
另一半是活动铁芯，构造和固定铁芯一样，用以带动主接点和辅助接点的闭合断开。
20安培以上的接触器加有灭弧罩，利用电路断开时产生的电磁力，快速拉断电弧，保护接点。
接触器具可高频率操作，做为电源开启与切断控制时﹐最高操作频率可达每小时1200次。
接触器的使用寿命很高，机械寿命通常为数百万次至一千万次，电寿命一般则为数十万次至数百万次。
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厦门市哲控工业设备有限公司
--------------------------
联系人：小莉
手机/微信同号：13400637411
QQ：572036776
电子邮箱：572036776@qq.com

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