轎車保險絲的首要效果：保bao護hu配pei線xian。應ying該gai挑tiao選xuan設she備bei大da小xiao合he適shi的de保bao險xian絲si，以yi保bao護hu所suo銜xian接jie的de導dao線xian。假jia如ru一yi個ge類lei似si轎jiao車che收shou音yin機ji的de設she備bei突tu然ran流liu過guo滿man足zu大da的de電dian流liu將jiang保bao險xian絲si熔rong斷duan，這zhe時shi收shou音yin機ji大da概gai也ye現xian已yi燒shao毀hui。在zai這zhe裏li，保bao險xian絲si的de效xiao果guo是shi保bao護hu導dao線xian，替ti換huan導dao線xian比bi替ti換huan收shou音yin機ji困kun難nan得de多duo。大da多duo數shu轎jiao車che有you兩liang個ge保bao險xian絲si盤pan。一yi個ge坐zuo落luo發fa動dong機ji室shi
，所suo設she備bei的de保bao險xian絲si用yong於yu冷leng卻que風feng扇
、防抱死製動泵和發動機控製單元等設備(所有這些設備都設備在發動機室)。lingyigebaoxiansipanyibanzuoluojiashiyuanxigailinjindeyibiaobanzhong
，qizhongsuoshebeidebaoxiansiyongyuchexiangzhongdeshebeihekaiguan。fadongjishibaoxiansipancheneibaoxiansipanzanmencongshangyibufenzhonglejiedao，daoxianneichanshengdereliangqujueyudaoxiandedianzuhedaoxianzhongjingguodedianliuliang。

其(qi)實(shi)，保(bao)險(xian)絲(si)隻(zhi)是(shi)獨(du)立(li)接(jie)頭(tou)中(zhong)的(de)一(yi)種(zhong)特(te)殊(shu)類(lei)型(xing)的(de)導(dao)線(xian)。如(ru)今(jin)，大(da)部(bu)分(fen)轎(jiao)車(che)保(bao)險(xian)絲(si)都(dou)由(you)兩(liang)個(ge)片(pian)狀(zhuang)接(jie)頭(tou)和(he)包(bao)含(han)導(dao)體(ti)的(de)塑(su)料(liao)外(wai)殼(ke)組(zu)成(cheng)。轎(jiao)車(che)配(pei)線(xian)中(zhong)還(hai)有(you)一(yi)些(xie)稱(cheng)為(wei)熔(rong)斷(duan)絲(si)的(de)保(bao)險(xian)絲(si)。各(ge)種(zhong)轎(jiao)車(che)保(bao)險(xian)絲(si)保(bao)險(xian)絲(si)內(nei)的(de)導(dao)體(ti)由(you)類(lei)似(si)於(yu)焊(han)料(liao)的(de)金(jin)屬(shu)製(zhi)成(cheng)。它(ta)比(bi)普(pu)通(tong)導(dao)線(xian)本(ben)身(shen)的(de)熔(rong)點(dian)低(di)。該(gai)導(dao)體(ti)的(de)尺(chi)寸(cun)要(yao)經(jing)過(guo)非(fei)常(chang)準(zhun)確(que)的(de)校(xiao)準(zhun)，以(yi)便(bian)在(zai)到(dao)達(da)額(e)定(ding)電(dian)流(liu)時(shi)，可(ke)以(yi)產(chan)生(sheng)滿(man)足(zu)的(de)熱(re)量(liang)熔(rong)斷(duan)該(gai)導(dao)體(ti)，斷(duan)開(kai)電(dian)路(lu)。保(bao)險(xian)絲(si)熔(rong)斷(duan)後(hou)，有(you)必(bi)要(yao)進(jin)行(xing)替(ti)換(huan)，電(dian)路(lu)才(cai)幹(gan)作(zuo)業(ye)。有(you)必(bi)要(yao)運(yun)用(yong)相(xiang)同(tong)安(an)培(pei)數(shu)的(de)保(bao)險(xian)絲(si)替(ti)換(huan)熔(rong)斷(duan)的(de)保(bao)險(xian)絲(si)。

zhakanbaoxiansizhakanbaoxiansijiaojiandandefangfashijiangqicongchazuozhongquchu，ranhouyonglianxuxingceshiyigouzhubaoxiansideliangpiandaoti。danshi，jiaruzheyangceshizhuangzaipeixianzhongdebaoxiansi
，dedaodelianxuxinghuiluhuoxubushijingguobaoxiansixingchengde(例如，在查看保險絲時，兩側的導線或許接地)。一般
，可經過目視查看區分保險絲是否已熔斷。