一、保險絲電阻一般是多大

保(bao)險絲作為保(bao)障電(dian)(dian)路安全的元器件(jian)，一般是熔點較低的金屬材質的，其本身具有一定的電(dian)(dian)阻，那么保(bao)險絲電(dian)(dian)阻多大呢？

正常情況下，導(dao)線可以(yi)通過電流(liu)，它的(de)電阻(zu)(zu)是比較(jiao)小的(de)，在一(yi)般的(de)電路(lu)計算中通常不計，而保(bao)險絲的(de)電阻(zu)(zu)要比等長的(de)導(dao)線更大，這樣(yang)才能(neng)在短路(lu)時及時熔斷，保(bao)護(hu)電路(lu)，普通的(de)保(bao)險絲電阻(zu)(zu)一(yi)般是在0.33Ω-1Ω范圍內。

該圖片由注冊用戶"荊湖酒徒"提供，版權聲明反饋

二、保險絲電阻大還是小好

保(bao)險(xian)絲(si)的(de)(de)電(dian)阻(zu)(zu)有大(da)有小(xiao)，不同電(dian)阻(zu)(zu)大(da)小(xiao)的(de)(de)熔斷(duan)器在實際(ji)應(ying)用過程(cheng)中的(de)(de)表現(xian)也有所(suo)不同，那(nei)么大(da)電(dian)阻(zu)(zu)的(de)(de)保(bao)險(xian)絲(si)好還(huan)是(shi)小(xiao)電(dian)阻(zu)(zu)的(de)(de)保(bao)險(xian)絲(si)好呢？

一般來說(shuo)，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)電(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)選擇要根(gen)據(ju)實際情(qing)況選，總體來說(shuo)，建議選大(da)點(dian)電(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)，主要原(yuan)因是：根(gen)據(ju)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)的(de)(de)(de)熔(rong)斷原(yuan)理(li)，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)利用電(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)熱(re)效(xiao)應來控制通(tong)(tong)過(guo)(guo)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)大(da)小，當通(tong)(tong)過(guo)(guo)的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)超過(guo)(guo)限定(ding)值時，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)就會(hui)熔(rong)斷；根(gen)據(ju)公式(shi)Q=I2RT可知，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)的(de)(de)(de)電(dian)(dian)(dian)(dian)阻(zu)越大(da)，在電(dian)(dian)(dian)(dian)流(liu)(liu)相同和通(tong)(tong)電(dian)(dian)(dian)(dian)時間相同的(de)(de)(de)情(qing)況下，產生(sheng)的(de)(de)(de)熱(re)量(liang)就會(hui)越大(da)，越容易熔(rong)斷，對于保(bao)(bao)(bao)護電(dian)(dian)(dian)(dian)路更好。如果保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)絲(si)的(de)(de)(de)電(dian)(dian)(dian)(dian)阻(zu)比較小的(de)(de)(de)話(hua)，那么(me)即使通(tong)(tong)過(guo)(guo)大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)也無(wu)法及時熔(rong)斷，不安(an)全(quan)。

當然，保險絲的電(dian)阻(zu)也(ye)不宜太(tai)大了(le)，不然稍微過(guo)一些(xie)大的電(dian)流(liu)就熔(rong)斷了(le)，影響家用電(dian)器的正常(chang)使用，一般建議根據電(dian)線大小和(he)家用電(dian)器的負荷來選(xuan)擇合適(shi)電(dian)阻(zu)大小的保險絲。