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接触器如何选型上海人民电器厂概述

2021/1/13 15:14:01      点击:

接触器如何选型

1、类型的选择:

交流电动机采用交流接触器。

直流负载采用直流接触器;当直流负载比较小时,也可选用交流接触器,但触头的额定电流应大些。

2、主触头额定电压的选择:

接触器主触头的额定电压应大于或等于负载回路的额定电压。

3、主触头额定电流的选择

接触器主触头的额定电流应等于电阻性负载的工作电流。若是电感性负载,则主触头的额定电流应大于电动机等电感性负载的额定电流。

4、吸引线圈电压的选择:

交流线圈:36V、110V、127V、220V、380V;

直流线圈:24V、48V、110V、220V、440V。

一般交流负载用交流线圈,直流负载用直流线圈,但交流负载频繁动作时,可采用直流线圈的接触器。

5、触头数量及触头类型的选择:

通常接触器的触头数量应满足控制支路的要求,触头类型应满足控制线路的功能要求。