一、熔斷器是什么東西
熔(rong)(rong)(rong)(rong)斷器是一種電路(lu)的(de)(de)安(an)全保護裝(zhuang)置,當電流超過(guo)(guo)(guo)規定值時,通(tong)過(guo)(guo)(guo)本身發熱(re)使熔(rong)(rong)(rong)(rong)體熔(rong)(rong)(rong)(rong)斷,從而斷開電路(lu),廣泛應用(yong)于高低壓配電系統和控制系統以及用(yong)電設備中,作為短(duan)(duan)路(lu)和過(guo)(guo)(guo)電流的(de)(de)保護器,是應用(yong)比較普(pu)遍的(de)(de)保護器件之一,具有(you)價(jia)格便宜、體積(ji)小、短(duan)(duan)路(lu)分斷能力較強、切斷短(duan)(duan)路(lu)更為安(an)全等諸(zhu)多(duo)特點。熔(rong)(rong)(rong)(rong)斷器種類眾多(duo),常(chang)用(yong)的(de)(de)主要有(you)插入式熔(rong)(rong)(rong)(rong)斷器、螺旋式熔(rong)(rong)(rong)(rong)斷器、封(feng)閉式熔(rong)(rong)(rong)(rong)斷器、快速熔(rong)(rong)(rong)(rong)斷器、自復熔(rong)(rong)(rong)(rong)斷器等。
二、熔斷器有什么用
熔(rong)斷(duan)器(qi)俗稱保險(xian)絲,是(shi)配(pei)電(dian)系統(tong)、控制系統(tong)和用(yong)電(dian)設(she)備中常用(yong)的保護(hu)器(qi)件(jian),它的作(zuo)用(yong)主要是(shi)在電(dian)路(lu)發生故(gu)障或異常時,由于線路(lu)內電(dian)流劇(ju)增(zeng),導線溫(wen)度升高,熔(rong)斷(duan)器(qi)會在高溫(wen)下(xia)自身熔(rong)斷(duan),從而切斷(duan)電(dian)流,起到保護(hu)電(dian)路(lu)安全運行,避免發生燒毀電(dian)路(lu)、燒壞(huai)元器(qi)件(jian)、發生火(huo)災等事故(gu)的作(zuo)用(yong)。
三、熔斷器的型號含義
熔(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)型號一般是(shi)有固(gu)定(ding)規則的(de)(de)(de),它的(de)(de)(de)型號標識由(you)字母(mu)(mu)和數(shu)字組成,第(di)(di)(di)一位(wei)(wei)一般都(dou)是(shi)R,這是(shi)熔(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)代(dai)號;第(di)(di)(di)二位(wei)(wei)則是(shi)熔(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)型式代(dai)號,由(you)字母(mu)(mu)組成,C表示(shi)(shi)(shi)插入式、L表示(shi)(shi)(shi)螺(luo)旋(xuan)(xuan)式、M表示(shi)(shi)(shi)無填(tian)料封閉(bi)(bi)管式、L表示(shi)(shi)(shi)有填(tian)料封閉(bi)(bi)管式;S表示(shi)(shi)(shi)快(kuai)速式;第(di)(di)(di)三位(wei)(wei)是(shi)數(shu)字,表示(shi)(shi)(shi)熔(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)設計代(dai)號;第(di)(di)(di)四(si)位(wei)(wei)表示(shi)(shi)(shi)的(de)(de)(de)是(shi)熔(rong)(rong)斷(duan)器(qi)(qi)的(de)(de)(de)額定(ding)電流(有的(de)(de)(de)還(huan)會標注(zhu)熔(rong)(rong)體(ti)的(de)(de)(de)額定(ding)電流)。比如RL6-25就表示(shi)(shi)(shi)熔(rong)(rong)斷(duan)器(qi)(qi)額定(ding)電流為(wei)25A的(de)(de)(de)螺(luo)旋(xuan)(xuan)式熔(rong)(rong)斷(duan)器(qi)(qi)。
四、熔斷器選型方法
熔斷器型號的選擇一般包括熔斷器類型選擇和熔體額定電流確定兩個方面:1、熔斷器類型的選擇:在選擇熔斷器類型時,應根據負載的保護特性和短路電流大小來選擇。2、熔體與熔斷器額定電流的確定:熔體額定電流大小與負載大小、負載性質有關。除了型號以外,還要注意所選擇的熔斷器品牌,畢竟關(guan)系到電路安全,一定(ding)要(yao)選擇正規的產品(pin)。
五、熔斷器工作原理介紹
熔(rong)斷(duan)器(qi)在正常工(gong)作情況(kuang)下,電流從(cong)引線(xian)端(duan)(duan)子(zi)A進入,由出(chu)線(xian)端(duan)(duan)子(zi)B引出(chu),正常工(gong)作,當出(chu)現短路故(gu)障(zhang)時,短路電流通過(guo)熔(rong)斷(duan)器(qi),根據焦耳定律,通過(guo)的(de)(de)電流越大,產生(sheng)的(de)(de)熱(re)量也越大,在高(gao)溫下,熔(rong)斷(duan)器(qi)內部的(de)(de)熔(rong)體(ti)受(shou)熱(re)熔(rong)斷(duan),從(cong)而(er)斷(duan)開(kai)電流,起到(dao)保護(hu)電路的(de)(de)作用。