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但由于工業(yè)自動(dòng)化控制裝置產(chǎn)品種類(lèi)繁多、市場(chǎng)需求量大，競(jìng)爭(zhēng)較激烈，國(guó)內(nèi)企業(yè)在產(chǎn)品的關(guān)鍵技術(shù)研發(fā)及產(chǎn)品制造上，相比國(guó)外仍有較大差距。 另外，各地工業(yè)自動(dòng)化產(chǎn)業(yè)的發(fā)展和本身工業(yè)化程度關(guān)系比較大，根據(jù)數(shù)據(jù)統(tǒng)計(jì)，目前我國(guó)江蘇工業(yè)自動(dòng)化總產(chǎn)值占比重較大，達(dá)到了48.31%；山東工業(yè)自動(dòng)化總產(chǎn)值占比為8.41%；浙江工業(yè)自動(dòng)化總產(chǎn)值占比為6.20%。 未來(lái)，隨著工業(yè)自動(dòng)化需求的不斷擴(kuò)張，行業(yè)吸引力將大幅增強(qiáng)，更多的企業(yè)加入到行業(yè)競(jìng)爭(zhēng)中來(lái)。據(jù)，2017-2022年，我國(guó)工業(yè)自動(dòng)化總產(chǎn)值將保持7%左右的增速。2017年，行業(yè)總產(chǎn)值約為3861億元；到2022年，我國(guó)工業(yè)自動(dòng)化總產(chǎn)值將超過(guò)5700億元
（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(xiàn)路計(jì)算負(fù)荷電流。當(dāng)按線(xiàn)路的計(jì)算電流選擇時(shí)，應(yīng)能滿(mǎn)足下式：
（4-10-6）
式中 ——低壓斷路器的額定電流，A；
——線(xiàn)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(xiàn)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）
APC Smart-UPS RM 3000VA USB UPS
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141A-SM45RS25
AMETEK CONTROLS 93PSG0002DD7AC / 93P DIGITAL PRESSURE
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141A-SM45RS25
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I.D. Matrix Symbology Reader with Acuity SR-20 Module
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141A-SM45RS25
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