真空(kong)滅弧室的壽(shou)命(ming)可分(fen)為真空(kong)壽(shou)命(ming)、電(dian)壽(shou)命(ming)和(he)機械壽(shou)命(ming)。任(ren)一(yi)壽(shou)命(ming)終(zhong)了，都要更換真空(kong)滅弧室。

　　真(zhen)(zhen)(zhen)空(kong)壽命(ming)包括真(zhen)(zhen)(zhen)空(kong)滅(mie)弧室的儲(chu)存(cun)壽命(ming)和最(zui)低工(gong)作(zuo)真(zhen)(zhen)(zhen)空(kong)度(du)(du)。真(zhen)(zhen)(zhen)空(kong)儲(chu)存(cun)壽命(ming)為(wei)20年(nian)，即從(cong)出廠之日(ri)起，真(zhen)(zhen)(zhen)空(kong)滅(mie)弧室在(zai)20年(nian)的儲(chu)存(cun)期內，其真(zhen)(zhen)(zhen)空(kong)度(du)(du)不得(de)低于最(zui)低工(gong)作(zuo)真(zhen)(zhen)(zhen)空(kong)度(du)(du)。最(zui)低工(gong)作(zuo)真(zhen)(zhen)(zhen)空(kong)度(du)(du)為(wei)6.6×10-2Pa。低于6.6×10-2Pa，真(zhen)(zhen)(zhen)空(kong)滅(mie)弧室的絕緣性能和開斷性能都會下降。真(zhen)(zhen)(zhen)空(kong)度(du)(du)可通過磁控真(zhen)(zhen)(zhen)空(kong)計或工(gong)頻耐壓法檢驗。

　　電(dian)(dian)(dian)(dian)壽(shou)命是(shi)(shi)指(zhi)真空滅弧室能夠成功開(kai)斷(duan)(duan)額(e)(e)定(ding)短(duan)(duan)路(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)次(ci)數(shu)或(huo)(huo)開(kai)斷(duan)(duan)額(e)(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)次(ci)數(shu)。實際使(shi)用過(guo)程中，開(kai)斷(duan)(duan)的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)既可(ke)能是(shi)(shi)額(e)(e)定(ding)短(duan)(duan)路(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，也可(ke)能是(shi)(shi)額(e)(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)或(huo)(huo)比(bi)額(e)(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)還小(xiao)的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，還可(ke)能是(shi)(shi)介于額(e)(e)定(ding)短(duan)(duan)路(lu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)與額(e)(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)任意(yi)值的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，開(kai)斷(duan)(duan)的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)是(shi)(shi)隨(sui)機的(de)(de)。所以，使(shi)用電(dian)(dian)(dian)(dian)壽(shou)命是(shi)(shi)無法用次(ci)數(shu)計算的(de)(de)。只能根據觸(chu)頭(tou)(tou)燒(shao)(shao)(shao)損(sun)量(liang)或(huo)(huo)由于觸(chu)頭(tou)(tou)燒(shao)(shao)(shao)損(sun)沉積在(zai)絕緣外(wai)殼內表(biao)(biao)面的(de)(de)金(jin)屬蒸發物是(shi)(shi)否嚴(yan)重影(ying)(ying)響絕緣或(huo)(huo)觸(chu)頭(tou)(tou)表(biao)(biao)面嚴(yan)重燒(shao)(shao)(shao)損(sun)后(hou)影(ying)(ying)響絕緣等(deng)因素確定(ding)。一(yi)般規定(ding)觸(chu)頭(tou)(tou)的(de)(de)燒(shao)(shao)(shao)損(sun)量(liang)為3mm。絕緣外(wai)殼內表(biao)(biao)面的(de)(de)絕緣和額(e)(e)定(ding)開(kai)距時觸(chu)頭(tou)(tou)間(jian)的(de)(de)絕緣可(ke)通過(guo)工頻耐(nai)壓(ya)和沖擊耐(nai)壓(ya)檢驗(yan)。

　　機(ji)械(xie)壽(shou)命(ming)一般是由真空(kong)滅弧室(shi)的(de)波紋(wen)管決定的(de)。而波紋(wen)管的(de)壽(shou)命(ming)又與其使用狀態有關。開距過大、波紋(wen)管受(shou)扭傷、開關合(he)閘彈跳和分閘返彈，都(dou)將(jiang)降低真空(kong)滅弧室(shi)的(de)機(ji)械(xie)壽(shou)命(ming)，應該(gai)盡量避免。機(ji)械(xie)壽(shou)命(ming)是否(fou)終了，可(ke)通(tong)過真空(kong)開關上的(de)計數器得知。