140U-H1C1-C30現(xiàn)貨
公司是一家專門(mén)從事PLC備件進(jìn)出口銷售、技術(shù)咨詢、技術(shù)服務(wù)、自動(dòng)化設(shè)備為一體的貿(mào)易公司。并與的多家PLC產(chǎn)品維護(hù)服務(wù)提供商建立了緊密的合作關(guān)系,北美、歐洲、亞洲您多能看到我們的身影。我們售出的PLC長(zhǎng)提供兩年的質(zhì)量保證,并且都經(jīng)過(guò)了嚴(yán)格的測(cè)試和認(rèn)證。本公司以“誠(chéng)信、創(chuàng)新、合作、共贏”的經(jīng)營(yíng)理念,不斷為客戶解決實(shí)際問(wèn)題,實(shí)現(xiàn)客戶和公司取得雙贏
(2)額定電流
斷路器的額定電流與過(guò)電流脫扣器的額定電流應(yīng)大于線路計(jì)算負(fù)荷電流。當(dāng)按線路的計(jì)算電流選擇時(shí),應(yīng)能滿足下式:
(4-10-6)
式中 ——低壓斷路器的額定電流,A;
——線路的計(jì)算電流或?qū)嶋H電流,A。
如果環(huán)境溫度低于+40℃,則電器產(chǎn)品溫度每低1℃,允許電流比額定電流值增加0.5%。但增加總數(shù)不得超過(guò)20%。
10.5 低壓斷路器
斷路器的保護(hù)定值
(1)長(zhǎng)延時(shí)脫扣器的電流整定值,動(dòng)作時(shí)間可以不小于10s;長(zhǎng)延時(shí)脫扣器只能作過(guò)載保護(hù)。
(2)短延時(shí)脫扣器的電流整定值,動(dòng)作時(shí)間約為0.1~0.4s;短延時(shí)脫扣器可以作短路保護(hù),也可以作過(guò)載保護(hù)。
(3)瞬時(shí)脫扣器的電流整定值,其動(dòng)作時(shí)間約為0.02s。瞬時(shí)脫扣器一般用作短路保護(hù)。
10.5 低壓斷路器
(3)瞬時(shí)過(guò)電流脫扣器的整定電流
瞬時(shí)脫扣器的動(dòng)作時(shí)間為0.02s左右。
瞬時(shí)或短時(shí)過(guò)電流脫扣器的整定電流應(yīng)能躲開(kāi)線路的尖峰電流。
1)負(fù)載是單臺(tái)電動(dòng)機(jī),整定電流按下式計(jì)算
(4-10-7)
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140U-H1C1-C30
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140U-H1C1-C30
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140U-H1C1-C30