斷(duan)路(lu)器(qi)是一(yi)種只要(yao)電(dian)(dian)(dian)路(lu)中電(dian)(dian)(dian)流超過(guo)額(e)定(ding)電(dian)(dian)(dian)流就會(hui)自動斷(duan)開的(de)(de)開關,其質量(liang)的(de)(de)好壞直接決(jue)定(ding)了(le)家庭(ting)用電(dian)(dian)(dian)是否安全。正(zheng)確(que)選擇額(e)定(ding)容量(liang)電(dian)(dian)(dian)流大(da)小的(de)(de)斷(duan)路(lu)器(qi)很重要(yao),如果(guo)額(e)定(ding)電(dian)(dian)(dian)流偏小,斷(duan)路(lu)器(qi)易頻繁跳閘,如果(guo)選擇過(guo)大(da),則達不到預期(qi)的(de)(de)保護效(xiao)果(guo)。