广州3TB39220XD2西门子接触器供应商 3TB40100XP0

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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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直流电流与交流电流相比较，不存在周期性的电流数值过零点，因此，传统接触器开断电路时，触头之间产生的电弧较为强烈，燃弧时间也比较长，以便充分释放电路中剩余的能量。电弧的燃烧产生高温和强光，对触头表面有严重的烧蚀作用，触头材料在多次开断之后逐渐流失，触头电磨损严重时，导致直流接触器报废，不能开断电路。 [1] 
电力电子技术得以迅猛发展，人们将电力电子元件应用到直流接触器中，巧妙的创造出一种混合式直流接触器，使得直流接触器向智能化、可控化迈进了新的一步。这种混合式接触器利用传统直流接触器在闭合导通状态下触头接触电阻小、导通压降小的优点，将由反并联晶闸管和控制模块单元共同组成的无触点开关并联在传统直流接触器触头上。这种无触点的电力电子开关分断电路时不产生电弧，这就避免了传统接触器中电弧对触头材料的电磨损，也就大大增加了触头的使用寿命和可靠性。 [1] 
直流接触器永磁机构
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