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實(shi)際上(shang)是(shi)一個(ge)電(dian)器(qi)線路(lu)的(de)(de)(de)保(bao)(bao)(bao)護(hu)裝(zhuang)置，集中在(zai)車的(de)(de)(de)一個(ge)或幾(ji)個(ge)地方，在(zai)線路(lu)出故障的(de)(de)(de)時候便(bian)于(yu)判(pan)斷問題所(suo)在(zai)，也可以(yi)說是(shi)電(dian)路(lu)的(de)(de)(de)樞紐站。是(shi)用來方便(bian)換保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)的(de)(de)(de)。保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)指(zhi)安裝(zhuang)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)的(de)(de)(de)盒(he)子(也稱保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)座)，方便(bian)安裝(zhuang)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)，部分具有防水(shui)、防火(huo)、耐高(gao)溫等(deng)性能特征(按材質及外形的(de)(de)(de)不(bu)(bu)同而定)。保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)可分為(wei)引(yin)線式(shi)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)、汽車保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)。保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)通(tong)用注塑材料(liao)有：塑料(liao)、尼龍、電(dian)木、pbt工程塑料(liao)。每種材質不(bu)(bu)同其耐高(gao)溫程度(du)不(bu)(bu)一。在(zai)選(xuan)(xuan)用保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)過(guo)程中，應(ying)考慮到所(suo)使用保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)的(de)(de)(de)電(dian)流(liu)大(da)小，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)的(de)(de)(de)尺寸要求(qiu)，保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)電(dian)流(liu)越大(da)，那么在(zai)與保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)配套的(de)(de)(de)線材便(bian)要選(xuan)(xuan)用較大(da)號的(de)(de)(de)線材，不(bu)(bu)然會導致(zhi)保(bao)(bao)(bao)險(xian)(xian)(xian)(xian)(xian)(xian)絲(si)(si)(si)盒(he)及線材發(fa)熱(re)，引(yin)起火(huo)災。