描述
對(duì)熔斷器的要求是:在電氣設(shè)備正常運(yùn)行時(shí),熔斷器不應(yīng)熔斷;在出現(xiàn)短路時(shí),應(yīng)立即熔斷;在電流發(fā)生正常變動(dòng)(如電動(dòng)機(jī)起動(dòng)過程)時(shí),熔斷器不應(yīng)熔斷;在用電設(shè)備持續(xù)過載時(shí),應(yīng)延時(shí)熔斷。對(duì)熔斷器的選用主要包括類型選擇和熔體額定電流的確定。
選擇熔斷器的類型時(shí),主要依據(jù)負(fù)載的保護(hù)特性和短路電流的大小。例如,用于保護(hù)照明和電動(dòng)機(jī)的熔斷器,一般是考慮它們的過載保護(hù),這時(shí),希望熔斷器的熔化系數(shù)適當(dāng)小些。所以容量較小的照明線路和電動(dòng)機(jī)宜采用熔體為鉛鋅合金的RC1A系列熔斷器,而大容量的照明線路和電動(dòng)機(jī),除過載保護(hù)外,還應(yīng)考慮短路時(shí)分?jǐn)喽搪冯娏鞯哪芰ΑH舳搪冯娏鬏^小時(shí),可采用熔體為錫質(zhì)的RCIA系列或熔體為鋅質(zhì)的RM10系列熔斷器。用于車間低壓供電線路的保護(hù)熔斷器,一般是考慮短路時(shí)的分?jǐn)嗄芰?。?dāng)短路電流較大時(shí),宜采用具有高分?jǐn)嗄芰Φ腞L1系列熔斷器。當(dāng)短路電流相當(dāng)大時(shí),宜采用有限流作用的RT0系列熔斷器。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
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