zaishiyongguochengzhong，qichebaoxiansizuodezhuyaozuoyongshidangdianluchuxianguzhanghuoyichangqingkuangshi，jiangyouxiaodibansuizhedianliudechixushenggao，qishebeineidedianliushenggaohuishidianluzhongmouxiezhongyaoqijianhuoguizhongqijianshoudaosunhuai。youyuqichebaoxiansizuodianliuguoda，jiyoukenengyinfadianluzhehuo，chanpinzaishiyongzhongbuhuishoudaodianliudeshanghai，

也可避免由於內部故障而對電子設備造成嚴重傷害，所以每一保險絲都有一個全規格的保險絲，當電流超過全規格時
，保險絲會熔斷。

如(ru)果(guo)將(jiang)熔(rong)斷(duan)器(qi)放(fang)在(zai)電(dian)路(lu)中(zhong)放(fang)置(zhi)得(de)當(dang)，它(ta)的(de)熔(rong)斷(duan)器(qi)會(hui)在(zai)電(dian)流(liu)異(yi)常(chang)上(shang)升(sheng)到(dao)一(yi)定(ding)高(gao)度(du)時(shi)，使(shi)設(she)備(bei)自(zi)身(shen)熔(rong)斷(duan)切(qie)斷(duan)電(dian)流(liu)，從(cong)而(er)起(qi)到(dao)保(bao)護(hu)電(dian)路(lu)安(an)全(quan)運(yun)行(xing)的(de)作(zuo)用(yong)。眾(zhong)所(suo)周(zhou)知(zhi)，熔(rong)斷(duan)器(qi)可(ke)以(yi)起(qi)保(bao)護(hu)作(zuo)用(yong)。

車用熔斷器座裝置的電路是采用額定電流為3安培的塑料銅芯軟線
，熔斷電流為1安培
，熔斷電流為2安培，除去一個小燈泡，

在I、J之間接入約2歐姆的電爐絲。因此當電源電壓為6伏

，電流應為3安培
，接上開關K，rongsirongduan。cheliangbaoxiansizuozhuangzhidianluchuyuzhengchangqingkuang，yekeyudaoxianxiangdeng
，huodianluchuxianguzhang
，baoxiansizuoweibaoxiansichuanzaidianluzhong，dangdianluchuxianguzhangshi，zaidianliuzengjiadaoweixianchengduzhiqian，zidongqieduandianyuan，yibimianyiwaifasheng。