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高(gao)壓(ya)隔(ge)離(li)(li)開(kai)(kai)關保(bao)證了(le)高(gao)壓(ya)電(dian)(dian)(dian)(dian)器及裝(zhuang)(zhuang)置在(zai)檢(jian)修工(gong)作(zuo)時的(de)(de)安(an)全，起(qi)隔(ge)離(li)(li)電(dian)(dian)(dian)(dian)壓(ya)的(de)(de)作(zuo)用(yong)，不(bu)能用(yong)與切(qie)斷、投入負(fu)荷電(dian)(dian)(dian)(dian)流和(he)(he)開(kai)(kai)斷短路(lu)電(dian)(dian)(dian)(dian)流，僅可(ke)用(yong)于不(bu)產(chan)生強大電(dian)(dian)(dian)(dian)弧(hu)的(de)(de)某些切(qie)換操(cao)作(zuo)，即是說它(ta)不(bu)具有滅弧(hu)功能；按安(an)裝(zhuang)(zhuang)地(di)點不(bu)同分為(wei)，屋(wu)內式(shi)(shi)和(he)(he)屋(wu)外式(shi)(shi)，按絕緣支(zhi)柱數目分為(wei)，單(dan)柱式(shi)(shi)，雙柱式(shi)(shi)和(he)(he)三(san)柱式(shi)(shi)，各電(dian)(dian)(dian)(dian)壓(ya)等級都有可(ke)選設備。還可(ke)將高(gao)壓(ya)配電(dian)(dian)(dian)(dian)裝(zhuang)(zhuang)置中(zhong)(zhong)需要停(ting)電(dian)(dian)(dian)(dian)的(de)(de)部分與帶(dai)電(dian)(dian)(dian)(dian)部分可(ke)靠地(di)隔(ge)離(li)(li)，以(yi)保(bao)證檢(jian)修工(gong)作(zuo)的(de)(de)安(an)全。高(gao)壓(ya)隔(ge)離(li)(li)開(kai)(kai)關的(de)(de)觸(chu)頭全部敞露在(zai)空氣中(zhong)(zhong)，具有明(ming)顯(xian)的(de)(de)斷開(kai)(kai)點，隔(ge)離(li)(li)開(kai)(kai)關沒有滅弧(hu)裝(zhuang)(zhuang)置，因此(ci)不(bu)能用(yong)來切(qie)斷負(fu)荷電(dian)(dian)(dian)(dian)流或(huo)短路(lu)電(dian)(dian)(dian)(dian)流，否則在(zai)高(gao)壓(ya)作(zuo)用(yong)下，斷開(kai)(kai)點將產(chan)生強烈電(dian)(dian)(dian)(dian)弧(hu)，并很難(nan)自行熄滅，甚至可(ke)能造成飛弧(hu)（相對地(di)或(huo)相間短路(lu)），燒損設備，危(wei)及人身安(an)全，這就是所謂(wei)“帶(dai)負(fu)荷拉隔(ge)離(li)(li)開(kai)(kai)關”的(de)(de)嚴重(zhong)事故。

高壓隔離開(kai)(kai)關(guan)還可(ke)以用來進行(xing)某些電路的(de)切換(huan)操作，以改變系統的(de)運行(xing)方式。例如(ru)：在雙母(mu)線(xian)電路中，可(ke)以用高壓隔離開(kai)(kai)關(guan)將運行(xing)中的(de)電路從一條母(mu)線(xian)切換(huan)到另一條母(mu)線(xian)上。