真空(kong)(kong)(kong)接觸(chu)器熄孤能力(li)強(qiang)，耐(nai)壓性能好，操作頻率較高(gao)，壽命長，無電(dian)(dian)弧(hu)(hu)外噴，體積小、重量輕(qing)、維修周期較長。真空(kong)(kong)(kong)接觸(chu)器的(de)真空(kong)(kong)(kong)滅弧(hu)(hu)室制造時(shi)(shi)工藝(yi)要(yao)求很高(gao)，如果工藝(yi)不(bu)良，滅弧(hu)(hu)室的(de)真空(kong)(kong)(kong)容(rong)易(yi)下降。觸(chu)頭材料材質不(bu)好，在分斷電(dian)(dian)流時(shi)(shi)會出(chu)現 "截流過電(dian)(dian)壓"現象，即在分斷電(dian)(dian)流時(shi)(shi)，由于(yu)真空(kong)(kong)(kong)滅弧(hu)(hu)室的(de)熄弧(hu)(hu)能力(li)很強(qiang)，電(dian)(dian)弧(hu)(hu)電(dian)(dian)流不(bu)是自然過零時(shi)(shi)切斷，而是從電(dian)(dian)流的(de)某(mou)一值突(tu)然降到零，由此(ci)而出(chu)現高(gao)的(de)過電(dian)(dian)壓。截流電(dian)(dian)壓會危(wei)及電(dian)(dian)氣設備的(de)安全運行(xing)。

真空接觸器利用(yong)真空滅弧室滅弧，用(yong)以(yi)頻繁接通(tong)和切斷正常工(gong)作(zuo)電流(liu)，通(tong)常用(yong)于(yu)遠距離接通(tong)和斷開中(zhong)、低(di)壓頻繁起停的6kV、380V(660V、1140V)交流(liu)電動機。