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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![广州3TB40010XD0西门子接触器供应商](http://l.b2b168.com/2019/10/31/08/201910310813353470774.jpg)
电路的装置,所以经常运用于电动机做为控制对象﹐也可用作控制工厂设备﹑电热器﹑工作母机和各样电力机组等电力负载,接触器不仅能接通和切断电路,而且还具有低电压释放保护作用。接触器控制容量大,适用于频繁操作和远距离控制,是自动控制系统中的重要元件之一。
在工业电气中,接触器的型号很多,工作电流在5A-1000A的不等,其用处相当广泛
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![广州3TB40010XD0西门子接触器供应商](http://l.b2b168.com/2019/10/31/08/201910310813355372574.jpg)
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接触器的工作原理是:当接触器线圈通电后,线圈电流会产生磁场,
产生的磁场使静铁芯产生电磁吸力吸引动铁芯,并带动交流接触器点动作,常闭触点断开,常开触点闭合,两者是联动的。当线圈断电时,电磁吸力消失,衔铁在释放弹簧的作用下释放,使触点复原,常开触点断开,常闭触点闭合。直流接触器的工作原理跟温度开关的原理有点相似。
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![广州3TB40010XD0西门子接触器供应商](http://l.b2b168.com/2019/10/31/08/201910310813366435244.jpg)
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