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造成保险(xian)丝熔断的主(zhu)要原因有(you)：
一是(shi)过(guo)载(zai)。家庭用电(dian)负荷太(tai)大，造成过(guo)载(zai)，使(shi)保险丝熔断(duan)。这种情况尤其是(shi)在(zai)使(shi)用空调器、电(dian)暖器或增加其他较大功率(lv)电(dian)器时容易出现。
二是接触不良。有的家(jia)庭尽管保(bao)(bao)(bao)险丝(si)选择得比较(jiao)(jiao)合理，负荷也不算(suan)太大(da)，可(ke)一使(shi)用空调器(qi)、电暖(nuan)器(qi)、电饭煲(bao)等较(jiao)(jiao)大(da)功(gong)率家(jia)电时，就会“跳闸(zha)”。原因可(ke)能(neng)是在安(an)装、更换保(bao)(bao)(bao)险丝(si)时，保(bao)(bao)(bao)险丝(si)与插头螺(luo)丝(si)接触不良，造(zao)成打火发(fa)热，使(shi)瓷插、闸(zha)刀(dao)上固定保(bao)(bao)(bao)险丝(si)的螺(luo)丝(si)氧化(hua)“烧死”。
三是(shi)(shi)短(duan)(duan)(duan)路(lu)(lu)。如果是(shi)(shi)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)换上后，一(yi)合闸就“跳(tiao)闸”，就可(ke)能是(shi)(shi)出现了短(duan)(duan)(duan)路(lu)(lu)。首(shou)先是(shi)(shi)线路(lu)(lu)短(duan)(duan)(duan)路(lu)(lu)。其次是(shi)(shi)负(fu)载短(duan)(duan)(duan)路(lu)(lu)，像电(dian)(dian)(dian)(dian)水壶、电(dian)(dian)(dian)(dian)饭锅等(deng)常(chang)用(yong)较大功(gong)(gong)率(lv)电(dian)(dian)(dian)(dian)器(qi)(qi)(qi)和(he)常(chang)用(yong)移动电(dian)(dian)(dian)(dian)器(qi)(qi)(qi)的(de)(de)插头(tou)以(yi)及劣质电(dian)(dian)(dian)(dian)器(qi)(qi)(qi)，都容(rong)易发生短(duan)(duan)(duan)路(lu)(lu)故障(zhang)。 为了使(shi)(shi)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)“保险(xian)(xian)”，应(ying)做好以(yi)下(xia)几点：一(yi)是(shi)(shi)不能使(shi)(shi)用(yong)太(tai)细的(de)(de)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)，使(shi)(shi)用(yong)细的(de)(de)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)，通过的(de)(de)正常(chang)电(dian)(dian)(dian)(dian)流(liu)也容(rong)易烧断(duan)(duan)，造(zao)成不必要的(de)(de)停电(dian)(dian)(dian)(dian)事故；二(er)是(shi)(shi)必须选择(ze)和(he)使(shi)(shi)用(yong)相适(shi)应(ying)的(de)(de)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)，保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)的(de)(de)熔(rong)断(duan)(duan)电(dian)(dian)(dian)(dian)流(liu)通常(chang)为额定电(dian)(dian)(dian)(dian)流(liu)的(de)(de)1.5～2.0倍。如家庭中正常(chang)用(yong)电(dian)(dian)(dian)(dian)时(shi)各用(yong)电(dian)(dian)(dian)(dian)器(qi)(qi)(qi)总功(gong)(gong)率(lv)之和(he)超过1100瓦(wa)的(de)(de)选择(ze)5安培(pei)的(de)(de)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)，使(shi)(shi)用(yong)直径为0.98毫米的(de)(de)20号保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)就可(ke)以(yi)了，当电(dian)(dian)(dian)(dian)流(liu)超过7.5安培(pei)至10安培(pei)时(shi)，保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)就会自动熔(rong)断(duan)(duan)达(da)到保护的(de)(de)目(mu)的(de)(de)；三是(shi)(shi)如果选择(ze)和(he)使(shi)(shi)用(yong)的(de)(de)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)符合规(gui)格而又经常(chang)出现保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)熔(rong)断(duan)(duan)的(de)(de)现象，说明电(dian)(dian)(dian)(dian)气(qi)线路(lu)(lu)和(he)电(dian)(dian)(dian)(dian)器(qi)(qi)(qi)设(she)备有问题，应(ying)及时(shi)请电(dian)(dian)(dian)(dian)工查找原(yuan)因，清除(chu)隐患。切不可(ke)随意(yi)更换粗(cu)保险(xian)(xian)丝(si)(si)(si)(si)(si)(si)和(he)干脆用(yong)铜丝(si)(si)(si)(si)(si)(si)、铁丝(si)(si)(si)(si)(si)(si)等(deng)代替。
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