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保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)（fuse）也(ye)(ye)被稱為(wei)(wei)電流(liu)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)，IEC127標準將(jiang)它(ta)定義為(wei)(wei)“熔(rong)(rong)斷體（fuse-link）”。其主要(yao)是(shi)(shi)起過(guo)(guo)載保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)作(zuo)用(yong)。汽(qi)車保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)材(cai)料是(shi)(shi)什么呢？保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)一(yi)般(ban)(ban)是(shi)(shi)由(you)電阻率較大、熔(rong)(rong)點較低(di)的(de)(de)銀(yin)銅合金(jin)制(zhi)(zhi)成的(de)(de)。起初用(yong)金(jin)屬(shu)(shu)鉛(qian)(qian)銻(ti)合金(jin)制(zhi)(zhi)作(zuo)的(de)(de)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)因為(wei)(wei)安全上(shang)的(de)(de)理由(you)被廢除了。我們平時(shi)常(chang)見的(de)(de)金(jin)屬(shu)(shu)鉛(qian)(qian)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)不是(shi)(shi)純(chun)金(jin)屬(shu)(shu)鉛(qian)(qian)制(zhi)(zhi)的(de)(de)。在金(jin)屬(shu)(shu)鉛(qian)(qian)中含有銻(ti)錫合金(jin)，這是(shi)(shi)為(wei)(wei)了達到(dao)更低(di)熔(rong)(rong)點的(de)(de)目的(de)(de)而添(tian)加(jia)的(de)(de)。沒有加(jia)入銻(ti)錫合金(jin)的(de)(de)金(jin)屬(shu)(shu)鉛(qian)(qian)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)是(shi)(shi)冒牌貨的(de)(de)劣(lie)質商(shang)品。按保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)形式分為(wei)(wei)過(guo)(guo)流(liu)保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)和過(guo)(guo)熱(re)保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)。用(yong)于(yu)過(guo)(guo)流(liu)保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)的(de)(de)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)是(shi)(shi)通常(chang)所說的(de)(de)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)(也(ye)(ye)稱為(wei)(wei)限(xian)流(liu)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si))。用(yong)于(yu)過(guo)(guo)熱(re)保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)的(de)(de)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)一(yi)般(ban)(ban)被稱為(wei)(wei)"溫(wen)(wen)(wen)(wen)度保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)"。溫(wen)(wen)(wen)(wen)度保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)有易熔(rong)(rong)合金(jin)型和感(gan)溫(wen)(wen)(wen)(wen)觸(chu)發器型、記(ji)憶合金(jin)型等溫(wen)(wen)(wen)(wen)度保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)(xian)絲(si)(si)可保(bao)(bao)(bao)(bao)(bao)護(hu)(hu)(hu)發熱(re)熱(re)電現象設備(bei)和容易發熱(re)的(de)(de)電氣設備(bei)的(de)(de)溫(wen)(wen)(wen)(wen)度過(guo)(guo)高。