開(kai)關(guan)型(xing)防雷器(qi)(qi)(qi)為(wei)間隙放電(dian)(dian)(dian)型(xing)器(qi)(qi)(qi)件，其雷電(dian)(dian)(dian)能(neng)(neng)量(liang)瀉放能(neng)(neng)力大(da)，在(zai)(zai)(zai)線(xian)路(lu)上使(shi)(shi)用(yong)(yong)的主要(yao)作用(yong)(yong)是泄放雷電(dian)(dian)(dian)能(neng)(neng)量(liang)；限(xian)壓型(xing)防雷器(qi)(qi)(qi)為(wei)氧化鋅壓敏電(dian)(dian)(dian)阻器(qi)(qi)(qi)件，其雷電(dian)(dian)(dian)能(neng)(neng)量(liang)瀉放能(neng)(neng)力小，但(dan)其過電(dian)(dian)(dian)壓抑制能(neng)(neng)力好，在(zai)(zai)(zai)線(xian)路(lu)上使(shi)(shi)用(yong)(yong)的主要(yao)作用(yong)(yong)是限(xian)制過電(dian)(dian)(dian)壓。因此(ci)，一般在(zai)(zai)(zai)建筑物(wu)入(ru)口處選用(yong)(yong)如開(kai)關(guan)型(xing)防雷器(qi)(qi)(qi)來(lai)泄放雷電(dian)(dian)(dian)能(neng)(neng)量(liang)，然后(hou)，在(zai)(zai)(zai)后(hou)級(ji)(ji)電(dian)(dian)(dian)路(lu)使(shi)(shi)用(yong)(yong)限(xian)壓型(xing)防雷器(qi)(qi)(qi)來(lai)限(xian)制因前級(ji)(ji)雷電(dian)(dian)(dian)能(neng)(neng)量(liang)瀉放后(hou)，在(zai)(zai)(zai)后(hou)級(ji)(ji)線(xian)路(lu)產(chan)生的高(gao)過電(dian)(dian)(dian)壓。兩種防雷器(qi)(qi)(qi)需配(pei)合(he)使(shi)(shi)用(yong)(yong)，方能(neng)(neng)保證配(pei)電(dian)(dian)(dian)線(xian)路(lu)中(zhong)設(she)備(bei)的安全(quan)。

下面用圖表展示兩者防雷器之間的區別。