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高(gao)壓(ya)(ya)隔(ge)離(li)開(kai)關保證了高(gao)壓(ya)(ya)電(dian)(dian)(dian)器及(ji)裝(zhuang)置(zhi)在檢修(xiu)工(gong)(gong)作(zuo)時的安全，起隔(ge)離(li)電(dian)(dian)(dian)壓(ya)(ya)的作(zuo)用(yong)，不(bu)能(neng)用(yong)與切斷(duan)、投入負荷(he)電(dian)(dian)(dian)流和開(kai)斷(duan)短(duan)(duan)路(lu)電(dian)(dian)(dian)流，僅可(ke)用(yong)于不(bu)產(chan)生強(qiang)大電(dian)(dian)(dian)弧的某些切換操作(zuo)，即是說它不(bu)具(ju)有滅弧功能(neng)；按安裝(zhuang)地(di)點(dian)(dian)不(bu)同(tong)分(fen)為，屋內(nei)式和屋外式，按絕緣支柱(zhu)數目分(fen)為，單柱(zhu)式，雙柱(zhu)式和三柱(zhu)式，各(ge)電(dian)(dian)(dian)壓(ya)(ya)等級都有可(ke)選設備(bei)。還可(ke)將高(gao)壓(ya)(ya)配(pei)電(dian)(dian)(dian)裝(zhuang)置(zhi)中需要停電(dian)(dian)(dian)的部分(fen)與帶電(dian)(dian)(dian)部分(fen)可(ke)靠地(di)隔(ge)離(li)，以保證檢修(xiu)工(gong)(gong)作(zuo)的安全。高(gao)壓(ya)(ya)隔(ge)離(li)開(kai)關的觸頭全部敞露(lu)在空氣中，具(ju)有明顯的斷(duan)開(kai)點(dian)(dian)，隔(ge)離(li)開(kai)關沒有滅弧裝(zhuang)置(zhi)，因此(ci)不(bu)能(neng)用(yong)來(lai)切斷(duan)負荷(he)電(dian)(dian)(dian)流或短(duan)(duan)路(lu)電(dian)(dian)(dian)流，否則在高(gao)壓(ya)(ya)作(zuo)用(yong)下，斷(duan)開(kai)點(dian)(dian)將產(chan)生強(qiang)烈電(dian)(dian)(dian)弧，并很難自行(xing)熄滅，甚至可(ke)能(neng)造成飛(fei)弧（相對(dui)地(di)或相間(jian)短(duan)(duan)路(lu)），燒(shao)損設備(bei)，危及(ji)人身安全，這就是所(suo)謂“帶負荷(he)拉隔(ge)離(li)開(kai)關”的嚴重事故。

高壓(ya)隔離(li)開關還可以用來(lai)進行(xing)(xing)某些(xie)電路的(de)切(qie)換操作，以改變系(xi)統的(de)運(yun)行(xing)(xing)方(fang)式。例如(ru)：在雙(shuang)母線(xian)(xian)電路中，可以用高壓(ya)隔離(li)開關將運(yun)行(xing)(xing)中的(de)電路從(cong)一條母線(xian)(xian)切(qie)換到另一條母線(xian)(xian)上。