yibanjicangbaoxiansidoushifuzejicangneidiankongxitongdeweihuhejidianqiyongde。qiewushiyongbibaoxiansihegaishangguizedeedingdianliuzhigaohuodidebaoxiansi。fouzekenenghuisunhuaidianqixitonghuoyinqihuozai。ruguoyoudianzishebeibuzuoye
，qingjianzhabaoxiansishifourongduan。

保險絲的功用是：zaidianluchanshengmaobinghuofanchangshi，bansuizhedianliubuduanshenggao，bingqieshenggaodedianliuyoukenengsunhuaidianluzhongdemouxiezhongyaoqijianhuoguizhongqijian，yeyoukenengfenhuidianlushenzhiyinqihuozai。

若(ruo)電(dian)路(lu)中(zhong)正(zheng)確(que)地(di)安(an)頓(dun)了(le)保(bao)險(xian)絲(si)
，那(na)麼(me)，保(bao)險(xian)絲(si)會(hui)在(zai)電(dian)流(liu)反(fan)常(chang)升(sheng)高(gao)到(dao)必(bi)定(ding)的(de)高(gao)度(du)和(he)必(bi)定(ding)的(de)時(shi)分(fen)
，本(ben)身(shen)熔(rong)斷(duan)切(qie)斷(duan)電(dian)流(liu)
，進(jin)而(er)起(qi)到(dao)維(wei)護(hu)電(dian)路(lu)安(an)全(quan)工(gong)作(zuo)的(de)功(gong)用(yong)。保(bao)險(xian)絲(si)維(wei)護(hu)電(dian)子(zi)/電力設備不受過電流/過guo熱re的de損sun傷shang，避bi免mian電dian子zi設she備bei因yin內nei部bu毛mao病bing所suo引yin起qi的de嚴yan重zhong損sun傷shang。保bao險xian絲si會hui在zai電dian流liu反fan常chang升sheng高gao到dao必bi定ding的de高gao度du和he熱re度du的de時shi分fen，本ben身shen熔rong斷duan切qie斷duan電dian流liu
，然ran後hou起qi到dao維wei護hu電dian路lu安an全quan運yun行xing的de作zuo用yong。