广州3TB39220XB0西门子接触器经销商 3TB43220XC2

另一半是活动铁芯，构造和固定铁芯一样，用以带动主接点和接点的闭合断开。
20A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。
接触器可高频率操作，做为电源开启与切断控制时﹐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。
技术发展
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半导体接触器：半导体接触器是一种通过改变电路回路的导通状态和断路状态而完成电流操作的接触器。
永磁接触器：永磁交流接触器是利用磁极的同性相斥、相吸的原理，用永磁驱动机构取代传统的电磁铁驱动机构而形成的一种微功耗接触器。
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交流接触器利用主接点来控制电路，
用接点来导通控制回路。
主接点一般是常开接点，而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。
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