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230问答网 > 55KW的电机，电流100A，星------三角启动电路中接触器的设计。

55KW的电机，电流100A，星------三角启动电路中接触器的设计。

2025-04-05 16:08:19

推荐回答（1个）

回答1：

如1和2为△形接法的接触器，3为Y形中性点连接接触器，那么我个人认为1和2应选用140A的，3选85A的。因为在Y-△形起动电路设计中，通常会将3先闭合，在合1，切换时先断3，再合2，所以1和2均要能承受电机的满载电流，3只承受电机Y形接法时的电流。所以为140/1.732=80A选85A是安全的。

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