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51问答网 > 15KW的配电箱用多大的空开、接触器、热继、怎么算的、求高手指点、降压启动的

15KW的配电箱用多大的空开、接触器、热继、怎么算的、求高手指点、降压启动的

2025-03-15 07:34:11

推荐回答（3个）

回答1：

首先估算出15KW在380V电压、功率因数0.8时，电流=15÷1.732÷0.38÷0.8≈28.5A
按照估算，可以使用32A的空气开关，但是，现在的质量很难保证，建议选用大一号40A，接触器也是一样，因为容量稍大一点，主触点会耐用一些，热继电器选用25~32A可调范围的就可以了。

回答2：

Y-三角启动，接触器用两只CJ20-25和一直CJ20-16，断路器用DZ47-63 D40,热继电器用JR36-32

回答3：

几相电

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