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lhs64987572
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樓主  發(fā)表于: 2009-08-04 17:07
今天用了一個(gè)LS的斷路器,額定電流為30A,當一位電工將其用在48A的加熱管上面,整整過(guò)了7分鐘,斷路器不跳閘,直到將2.5平電線(xiàn)熔化相線(xiàn)短路才跳閘,想請教1、為什么超過(guò)30A的電流在那么長(cháng)的時(shí)間多不保護,2、請問(wèn)超過(guò)多少額定電流,多少時(shí)間跳閘其關(guān)系如何???3、以上事件正常么?還是LS質(zhì)量不行?
qwe123zxclk
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1樓  發(fā)表于: 2009-08-04 17:49
請問(wèn)你的開(kāi)關(guān)有沒(méi)有長(cháng)延時(shí)保護的,有類(lèi)開(kāi)關(guān)只是短路保護(如施耐德的電磁脫扣器MA),如有長(cháng)延時(shí)保護,整定電流30A的開(kāi)關(guān)通過(guò)48A的電流延時(shí)會(huì )分閘,具體時(shí)間查該斷路器的脫扣曲線(xiàn)
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