Rexroth R165129310現貨
公司始終秉承“誠信、高效、共贏、創新、發展”的經營理念,專業從事國內外自動化設備及元器件的銷售與維修服務。歷經多年成長,迅速崛起為傳感器、氣動行業一匹黑馬。依托Hydrotechnik海德泰尼克、阿爾維勒(ALLWEILER、HOUTTUIN、IMO、WARREN)泵、費斯托FESTO、日本SMC、樂可利legris、E+H、DCS系統備件(A-B、ABB、GE、施耐德140、FOXBORO)、德國HBM、傳力Transcell、梅特勒-托利多等國際品牌強有力的支持。涵蓋傳感元件、氣動液壓元件、儀器儀表元件、低壓電器元件等。服務于:輪胎、汽車、卷煙、水泥、化工、發電、鋼鐵、造紙、機械、食品、包裝、飲料、制藥、污水處理等重要行業。在保質保量的情況下,切合實際為客戶降低設備運行成本,提高服務水平更好的為廣大客戶服務而不懈努力,攜手合作
(2)額定電流
斷路器的額定電流與過電流脫扣器的額定電流應大于線路計算負荷電流。當按線路的計算電流選擇時,應能滿足下式:
(4-10-6)
式中 ——低壓斷路器的額定電流,A;
——線路的計算電流或實際電流,A。
如果環境溫度低于+40℃,則電器產品溫度每低1℃,允許電流比額定電流值增加0.5%。但增加總數不得超過20%。
10.5 低壓斷路器
斷路器的保護定值
(1)長延時脫扣器的電流整定值,動作時間可以不小于10s;長延時脫扣器只能作過載保護。
(2)短延時脫扣器的電流整定值,動作時間約為0.1~0.4s;短延時脫扣器可以作短路保護,也可以作過載保護。
(3)瞬時脫扣器的電流整定值,其動作時間約為0.02s。瞬時脫扣器一般用作短路保護。
10.5 低壓斷路器
(3)瞬時過電流脫扣器的整定電流
瞬時脫扣器的動作時間為0.02s左右。
瞬時或短時過電流脫扣器的整定電流應能躲開線路的尖峰電流。
1)負載是單臺電動機,整定電流按下式計算
(4-10-7)
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