三線(xian)四頭短接(jie)(jie)線(xian)測(ce)(ce)試(shi)(shi)(shi)(shi)線(xian)又稱(cheng)測(ce)(ce)試(shi)(shi)(shi)(shi)導線(xian)是(shi)電(dian)(dian)力系(xi)統檢(jian)修試(shi)(shi)(shi)(shi)驗(yan)(yan)時的測(ce)(ce)試(shi)(shi)(shi)(shi)線(xian)。適用(yong)(yong)于繼電(dian)(dian)保護現場，試(shi)(shi)(shi)(shi)驗(yan)(yan)室及其它(ta)試(shi)(shi)(shi)(shi)驗(yan)(yan)調(diao)試(shi)(shi)(shi)(shi)的場所，具有連(lian)接(jie)(jie)方便(只需進行插(cha)撥連(lian)接(jie)(jie)， 不需開(kai)啟設備)， 接(jie)(jie)觸電(dian)(dian)阻小，導線(xian)柔軟，絕緣性能好(hao)等特點(dian)。該(gai)系(xi)列測(ce)(ce)試(shi)(shi)(shi)(shi)導線(xian)與保護試(shi)(shi)(shi)(shi)驗(yan)(yan)裝置配(pei)套使用(yong)(yong)將大大提高現場調(diao)試(shi)(shi)(shi)(shi)效率， 此(ci)外這(zhe)種(zhong)測(ce)(ce)試(shi)(shi)(shi)(shi)線(xian)也適用(yong)(yong)于儀器儀表(biao)配(pei)套、電(dian)(dian)氣測(ce)(ce)量及高壓(ya)專業的測(ce)(ce)試(shi)(shi)(shi)(shi)、試(shi)(shi)(shi)(shi)驗(yan)(yan)

電力(li)測(ce)試(shi)導線(xian)(xian)(xian)(xian)(xian)（多股軟線(xian)(xian)(xian)(xian)(xian)）產品(pin)介紹了不同線(xian)(xian)(xian)(xian)(xian)徑的丁晴(qing)護套線(xian)(xian)(xian)(xian)(xian)。和(he)可加(jia)工成的各(ge)種(zhong)測(ce)試(shi)線(xian)(xian)(xian)(xian)(xian)，如(ru)：電壓測(ce)試(shi)線(xian)(xian)(xian)(xian)(xian)、電流測(ce)試(shi)線(xian)(xian)(xian)(xian)(xian)、接(jie)地電阻測(ce)試(shi)線(xian)(xian)(xian)(xian)(xian)、短接(jie)線(xian)(xian)(xian)(xian)(xian)等 等。還有各(ge)種(zhong)規(gui)格的多芯(xin)(xin)(xin)測(ce)試(shi)線(xian)(xian)(xian)(xian)(xian)。如(ru)：兩芯(xin)(xin)(xin)線(xian)(xian)(xian)(xian)(xian)、三芯(xin)(xin)(xin)線(xian)(xian)(xian)(xian)(xian)、四芯(xin)(xin)(xin)線(xian)(xian)(xian)(xian)(xian)、六芯(xin)(xin)(xin)線(xian)(xian)(xian)(xian)(xian)等等，均可按用戶需(xu)求加(jia)工，應用較為廣泛，如(ru)：電能表校(xiao)驗(yan)儀、校(xiao)驗(yan)裝置、接(jie)地電阻測(ce)試(shi)儀等

用(yong)以作暫時性(xing)電路連(lian)接的，形似鱷魚嘴的接線端子——亦稱“彈簧夾"、“電夾"

使用時外面需要套絕緣(yuan)套，材料一般為純銅、鐵(tie)鍍(du)鎳、鐵(tie)鍍(du)鋅、鐵(tie)鍍(du)銅或(huo)者(zhe)不銹鋼。

鱷魚夾(jia)是(shi)模(mo)型制作中的(de)一(yi)種(zhong)常用工具(ju)。因其(qi)變化(hua)多(duo)樣的(de)嘴形，且(qie)鋸齒狀(zhuang)的(de)夾(jia)口可(ke)以(yi)牢(lao)牢(lao)地夾(jia)住要著(zhu)色的(de)零(ling)件(jian)(jian)，保(bao)證(zheng)不(bu)會(hui)讓零(ling)件(jian)(jian)松(song)脫，又在(zai)夾(jia)子一(yi)邊增加了尾部(bu)的(de)長柄，使其(qi)能夠插在(zai)泡沫上固定，在(zai)模(mo)型噴漆時，使零(ling)件(jian)(jian)上色變得(de)更為方便。
在使用時(shi)，先將鱷魚夾夾住零(ling)件(jian)內部不(bu)上色的(de)部分，使其不(bu)松動，另一(yi)端長柄(bing)插(cha)入(ru)泡(pao)沫(mo)固(gu)定，將要上色的(de)零(ling)件(jian)一(yi)個(ge)個(ge)固(gu)定好，再用噴灌從(cong)左到(dao)右(you)掃過(guo)零(ling)件(jian)進(jin)行上色。也可(ke)以(yi)將夾好的(de)零(ling)件(jian)單個(ge)用噴筆上色。