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交流接触器参数主要由四部分组成:(1) 电磁系统,包括吸引线圈、动铁芯和静铁芯；(2)触头系统,包括三组主触头和一至两组常开、常闭辅助触头,它和动铁芯是连在一起互相联动的；(3)灭弧装置,一般容量较大的交流接触器都设有灭弧装置,以便迅速切断电弧,免于烧坏主触头；(4)绝缘外壳及附件,各种弹簧、传动机构、短路环、接线柱等。 工作原理 当线圈通电时,静铁芯产生电磁吸力,将动铁芯吸合,由于触头系统是与动铁芯联动的,因此动铁芯带动三条动触片同时动作,主触点闭合,和主触点机械相连的辅助常闭触点断开，辅助常开触点闭合，从而接通电源。当线圈断电时,吸力消失, 动铁芯联动部分依靠弹簧的反作用力而分离,使主触头断开,和主触点机械相连的辅助常闭触点闭合，辅助常开触点断开，从而切断电源。