3RU11熱過載繼電器額定電流可達 100A。它被設計用來為具有一般起動條件 （見“脫扣等級”）的用電設備提供與電流有關的保護，以防止其溫升因過載或缺相（見“缺相保護”） 而超出允許值。過載或缺相會導致電動機的電流升高超過整定的額定電流值 （見“整定”）。電流的升高通過發熱元件加熱過載繼電器內的雙金屬條，后者彎曲后又通過一個脫扣機構來操作一副輔助觸頭 （見 “輔助觸頭”）。此輔助觸頭又可通過一個接觸器來斷開負載。斷開時間取決于脫扣電流與額定工作電流I e之比值具有長期穩定的脫扣特性曲線 （見“脫扣特性”）。 “脫扣”狀態由一個通斷位置指示器來指示 （見“狀態指示”）。在一段恢復時間 （見“恢復時間”）過后，繼電器可以手動或自動復位 （見“手動和自動復位”）。
3RU11熱過載繼電器專門針對3RT1 接觸器進行了電氣和機械方面的優化。除可獨立安裝外，還可以直接插接在接觸器上以節省空間 （見“設計與安裝”）。主、 輔回路可以多種方式連接 （見“連接”），包括使用籠形卡頭式端子。過載繼電器連好后，可以通過一個測試檢驗其動作是否正常 （見“測試功能”）。 除了測試功能以外，3RU11熱過載繼電器還配有停止功能 （見 “停止功能”）。
3RU11熱過載繼電器用途很廣，詳情請參考下列章節“應用” 、 “環境條件” 、 “用于星型-三角形組合的過載繼電器”和“與變頻器配合使用” 3RU11 熱過載繼電器只提供過載和缺相保護。用戶仍須采用熔絲或斷路器進行短路保護（見 “短路保護”）。3RU11熱過載繼電器是環保型產品 （見“環保考慮” ）。它符合所有主要的國際標準和認證 （見 “規
格”和“EEx 增強型安全保護”）。3RU11熱過載繼電器的附件是按照“用最少的種類以滿足所有的要求”這一原則進行設計的。
應用
3RU11熱過載繼電器適用于保護三相及單相交流及直流電機。
如果單相交流或直流負載要采用3RU11熱過載繼電器加以保護，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。
與星—三角起動器組合的過載繼電器
當在星形 — 三角形組合中采用過載繼電器時，必須注意只有1/U的電機電流流過主接觸器。安裝在主接觸器上的過載繼電器必須設置為電機電流的0.58 倍。3RU2116-1FB0
廈門彬碩自動化科技有限公司 歐陽先生
固話：0592-5588182
手機：18050007615
傳真：0592-5588120
QQ： 403416001
E-mail：403416001@qq.com
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