ABB接触器AX370-30-11-80220V多

说一下接触器的作用：用小电流的开关去控制大电流的电器；用接触器的好处是 让人方便操作，操作时降低危险系数；
下面就回答你的问题：1、接触器分两部分一个是线圈要通过控制开关与电源并联，另一个是触点开关和负载串联；2、接触器本身就是一个开关，如果不是大的电器没有复杂的启动程序用什么开关都可以。
为什么要用？因为1、有的开关一次不是只用到一个开关，比如电动机星--角启动一次要有好几个开关同时动作。你见过卫星上天有人去合闸刀的吗？2、降低危险 大电流闸刀拉闸时的电弧是伤人的、有的场地是有危险的人不能去可电源线又不能到处跑，这就需要远程控制，大电流的地方、危险的地方用接触器，我们在安全的地方去控制
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