3RU11熱過(guò)載繼電器額定電流可達(dá) 100A。它被設(shè)計(jì)用來(lái)為具有一般起動(dòng)條件 （見(jiàn)“脫扣等級(jí)”）的用電設(shè)備提供與電流有關(guān)的保護(hù)，以防止其溫升因過(guò)載或缺相（見(jiàn)“缺相保護(hù)”） 而超出允許值。過(guò)載或缺相會(huì)導(dǎo)致電動(dòng)機(jī)的電流升高超過(guò)整定的額定電流值 （見(jiàn)“整定”）。電流的升高通過(guò)發(fā)熱元件加熱過(guò)載繼電器內(nèi)的雙金屬條，后者彎曲后又通過(guò)一個(gè)脫扣機(jī)構(gòu)來(lái)操作一副輔助觸頭 （見(jiàn) “輔助觸頭”）。此輔助觸頭又可通過(guò)一個(gè)接觸器來(lái)斷開(kāi)負(fù)載。斷開(kāi)時(shí)間取決于脫扣電流與額定工作電流I e之比值具有長(zhǎng)期穩(wěn)定的脫扣特性曲線 （見(jiàn)“脫扣特性”）。 “脫扣”狀態(tài)由一個(gè)通斷位置指示器來(lái)指示 （見(jiàn)“狀態(tài)指示”）。在一段恢復(fù)時(shí)間 （見(jiàn)“恢復(fù)時(shí)間”）過(guò)后，繼電器可以手動(dòng)或自動(dòng)復(fù)位 （見(jiàn)“手動(dòng)和自動(dòng)復(fù)位”）。
3RU11熱過(guò)載繼電器專(zhuān)門(mén)針對(duì)3RT1 接觸器進(jìn)行了電氣和機(jī)械方面的優(yōu)化。除可獨(dú)立安裝外，還可以直接插接在接觸器上以節(jié)省空間 （見(jiàn)“設(shè)計(jì)與安裝”）。主、 輔回路可以多種方式連接 （見(jiàn)“連接”），包括使用籠形卡頭式端子。過(guò)載繼電器連好后，可以通過(guò)一個(gè)測(cè)試檢驗(yàn)其動(dòng)作是否正常 （見(jiàn)“測(cè)試功能”）。 除了測(cè)試功能以外，3RU11熱過(guò)載繼電器還配有停止功能 （見(jiàn) “停止功能”）。
3RU11熱過(guò)載繼電器用途很廣，詳情請(qǐng)參考下列章節(jié)“應(yīng)用” 、 “環(huán)境條件” 、 “用于星型-三角形組合的過(guò)載繼電器”和“與變頻器配合使用” 3RU11 熱過(guò)載繼電器只提供過(guò)載和缺相保護(hù)。用戶(hù)仍須采用熔絲或斷路器進(jìn)行短路保護(hù)（見(jiàn) “短路保護(hù)”）。3RU11熱過(guò)載繼電器是環(huán)保型產(chǎn)品 （見(jiàn)“環(huán)保考慮” ）。它符合所有主要的國(guó)際標(biāo)準(zhǔn)和認(rèn)證 （見(jiàn) “規(guī)
格”和“EEx 增強(qiáng)型安全保護(hù)”）。3RU11熱過(guò)載繼電器的附件是按照“用最少的種類(lèi)以滿足所有的要求”這一原則進(jìn)行設(shè)計(jì)的。
應(yīng)用
3RU11熱過(guò)載繼電器適用于保護(hù)三相及單相交流及直流電機(jī)。
如果單相交流或直流負(fù)載要采用3RU11熱過(guò)載繼電器加以保護(hù)，則所有三相雙金屬片都必須加熱。因此繼電器的所有主電路都必須串聯(lián)。
與星—三角起動(dòng)器組合的過(guò)載繼電器
當(dāng)在星形 — 三角形組合中采用過(guò)載繼電器時(shí)，必須注意只有1/U的電機(jī)電流流過(guò)主接觸器。安裝在主接觸器上的過(guò)載繼電器必須設(shè)置為電機(jī)電流的0.58 倍。3RU2116-1FC1
廈門(mén)彬碩自動(dòng)化科技有限公司 歐陽(yáng)先生
固話：0592-5588182
手機(jī)：18050007615
傳真：0592-5588120
QQ： 403416001
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