断路器是起保护作用的，能熄灭电弧，有分段能力。接触器是利用线圈来控制电路的通断，接触器通电后，常开的就闭上了，长闭的打开，这样来控制。
1、断路器主要做保护，它的保护目前比较常用的是三段保护，既过载保护、短路短延时、短路长延时。还有一些欠压、过压等保护功能。具体视、型号而定。它的分合闸可以手动也可电动。安装方式有固定式、抽屉式等。根据电流的大小和工作电压的等级可以分多种。
2、接触器主要做工业控制用，一般负载以电机居多，当然会有一些加热器、做双电源切换等场合使用。在接触器的通断是通过控制线圈电压来实现的。根据灭弧的不同结构可以分为真空接触器和普通接触器。根据不同的控制电压可以分为直流接触器和交流接触器，它的主要附件为辅助触点。鸿飞达-李工hongfeida137
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