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230问答网 > 为什么根据断路器额定电流选择导线时，导线载流量要比断路器额定电流大，来选出导线？详细解释

为什么根据断路器额定电流选择导线时，导线载流量要比断路器额定电流大，来选出导线？详细解释

2025-04-03 18:25:14

推荐回答（2个）

回答1：

因为断路器额定电流与导线载流量等同时，断路器永不跳闸，只有导线载流量大于断路器额定电流一定值时才在一定时间跳闸，导线载流量越大，断路器延时跳闸时间越短。
若是反过来，选导线的载流量远比该回路的断路器额定电流小，则导线有可能在通过大电流发热出现火灾时，断路器还不一定能达到过载跳闸。

回答2：

因为在计算时是以单线的截流量来计算。在实际的施工过程中是几条线一起铺设的，就会产生电流热效应，这个时候就要选取一个系数（小于1）来计算导线的截流量。所以导线载流量要比断路器额定电流大

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