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保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)也被稱為(wei)電(dian)流(liu)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)，IEC127標準將它定(ding)義為(wei)"熔(rong)斷(duan)體（fuse-link)"。其主(zhu)要是起過(guo)(guo)載保(bao)(bao)(bao)(bao)(bao)護作(zuo)用。電(dian)路中(zhong)正確(que)安置保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)，保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)便會(hui)在(zai)電(dian)流(liu)異常升高到一定(ding)的(de)高度和(he)熱(re)度的(de)時(shi)(shi)候，自身熔(rong)斷(duan)切斷(duan)電(dian)流(liu)，保(bao)(bao)(bao)(bao)(bao)護了電(dian)路安全運行。額定(ding)電(dian)流(liu)：反(fan)映保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)實際應用時(shi)(shi)的(de)電(dian)流(liu)值。-In被標在(zai)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)上。慢熔(rong)斷(duan)：(延(yan)時(shi)(shi)型，抗浪涌）-在(zai)高過(guo)(guo)流(liu)時(shi)(shi)，保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)動(dong)(dong)作(zuo)較(jiao)慢-保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)上標有T；-慢熔(rong)斷(duan)保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)上含有錫球或鍍層。快速動(dong)(dong)作(zuo)：-在(zai)高過(guo)(guo)流(liu)時(shi)(shi)，保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)動(dong)(dong)作(zuo)較(jiao)快；-保(bao)(bao)(bao)(bao)(bao)險(xian)(xian)絲(si)上標有F。