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保(bao)險絲也(ye)被稱(cheng)為(wei)熔斷器(qi),IEC127標(biao)準將(jiang)它(ta)(ta)定(ding)義為(wei)"熔斷體(fuse-link)"。它(ta)(ta)是(shi)一種安(an)(an)裝在(zai)(zai)電(dian)路(lu)中(zhong),保(bao)證(zheng)電(dian)路(lu)安(an)(an)全運(yun)(yun)行(xing)的電(dian)器(qi)元(yuan)件(jian)。保(bao)險絲的作用是(shi):當電(dian)路(lu)發生(sheng)故障或(huo)異(yi)常時(shi),伴隨著電(dian)流(liu)不斷升高(gao),并(bing)且(qie)升高(gao)的電(dian)流(liu)有(you)可(ke)能損壞電(dian)路(lu)中(zhong)的某(mou)些重(zhong)要器(qi)件(jian)或(huo)貴重(zhong)器(qi)件(jian),也(ye)有(you)可(ke)能燒毀電(dian)路(lu)甚(shen)至造成火(huo)災(zai)。若電(dian)路(lu)中(zhong)正確地安(an)(an)置了(le)保(bao)險絲,那(nei)么(me),保(bao)險絲就會在(zai)(zai)電(dian)流(liu)異(yi)常升高(gao)到(dao)一定(ding)的高(gao)度和一定(ding)的時(shi)候,自身熔斷切(qie)斷電(dian)流(liu),從而起到(dao)保(bao)護(hu)電(dian)路(lu)安(an)(an)全運(yun)(yun)行(xing)的作用。
最早的深圳保險絲于一百多年前由愛迪生發明,由于當時的工業技術不發達白熾燈很貴重,所以,最初是將它用來保護價格昂貴的白熾燈的。