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高壓(ya)(ya)(ya)隔(ge)(ge)離(li)(li)開關保證了高壓(ya)(ya)(ya)電(dian)(dian)(dian)(dian)器及(ji)裝置在檢修工作時的(de)安(an)全，起隔(ge)(ge)離(li)(li)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)的(de)作用(yong)，不(bu)能(neng)(neng)用(yong)與切斷(duan)、投入負荷(he)電(dian)(dian)(dian)(dian)流(liu)和(he)開斷(duan)短路電(dian)(dian)(dian)(dian)流(liu)，僅可用(yong)于不(bu)產生(sheng)強大電(dian)(dian)(dian)(dian)弧(hu)(hu)的(de)某(mou)些切換操作，即(ji)是說它不(bu)具有(you)滅(mie)弧(hu)(hu)功(gong)能(neng)(neng)；按(an)(an)安(an)裝地(di)(di)點(dian)(dian)不(bu)同分為，屋內(nei)式和(he)屋外式，按(an)(an)絕緣支柱數目分為，單柱式，雙柱式和(he)三柱式，各電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)等(deng)級(ji)都有(you)可選設(she)(she)備。還可將高壓(ya)(ya)(ya)配電(dian)(dian)(dian)(dian)裝置中需要停電(dian)(dian)(dian)(dian)的(de)部(bu)分與帶(dai)電(dian)(dian)(dian)(dian)部(bu)分可靠地(di)(di)隔(ge)(ge)離(li)(li)，以保證檢修工作的(de)安(an)全。高壓(ya)(ya)(ya)隔(ge)(ge)離(li)(li)開關的(de)觸頭全部(bu)敞露在空氣(qi)中，具有(you)明(ming)顯的(de)斷(duan)開點(dian)(dian)，隔(ge)(ge)離(li)(li)開關沒(mei)有(you)滅(mie)弧(hu)(hu)裝置，因此不(bu)能(neng)(neng)用(yong)來切斷(duan)負荷(he)電(dian)(dian)(dian)(dian)流(liu)或短路電(dian)(dian)(dian)(dian)流(liu)，否則(ze)在高壓(ya)(ya)(ya)作用(yong)下，斷(duan)開點(dian)(dian)將產生(sheng)強烈電(dian)(dian)(dian)(dian)弧(hu)(hu)，并很難(nan)自(zi)行熄(xi)滅(mie)，甚至可能(neng)(neng)造(zao)成飛弧(hu)(hu)（相對(dui)地(di)(di)或相間(jian)短路），燒損設(she)(she)備，危及(ji)人身安(an)全，這就是所(suo)謂“帶(dai)負荷(he)拉隔(ge)(ge)離(li)(li)開關”的(de)嚴重事故(gu)。

高壓隔離開(kai)關(guan)還可(ke)以用(yong)來進行(xing)某些電路(lu)的(de)切(qie)換操作，以改(gai)變系統的(de)運行(xing)方式。例如：在雙母(mu)線電路(lu)中，可(ke)以用(yong)高壓隔離開(kai)關(guan)將運行(xing)中的(de)電路(lu)從一(yi)條母(mu)線切(qie)換到另一(yi)條母(mu)線上。