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陶瓷(ci)氣(qi)體(ti)(ti)放(fang)電(dian)(dian)(dian)管，Gas Discharge Tubes，簡稱(cheng)GDT，內(nei)(nei)部(bu)由壹個(ge)或壹個(ge)以上(shang)放(fang)電(dian)(dian)(dian)間隙內(nei)(nei)充有惰性(xing)氣(qi)體(ti)(ti)構(gou)成的(de)密閉(bi)器件。GDT電(dian)(dian)(dian)氣(qi)性(xing)能(neng)取決(jue)於氣(qi)體(ti)(ti)種類、氣(qi)體(ti)(ti)壓力、內(nei)(nei)部(bu)電(dian)(dian)(dian)極(ji)結(jie)構(gou)、制(zhi)作工藝等因素。當(dang)加到兩電(dian)(dian)(dian)極(ji)端的(de)電(dian)(dian)(dian)壓達(da)到使(shi)GDT內(nei)(nei)的(de)氣(qi)體(ti)(ti)擊穿時，開始放(fang)電(dian)(dian)(dian)，由高阻抗變成低阻抗，使(shi)浪湧電(dian)(dian)(dian)壓迅速(su)短路至接近零電(dian)(dian)(dian)壓，並將(jiang)過電(dian)(dian)(dian)流釋放(fang)入地(di)，從而(er)對後續電(dian)(dian)(dian)路起到保護作用。

GDT可(ke)以(yi)承(cheng)受高達(da)數十甚(shen)至(zhi)數百(bai)千安培的(de)(de)(de)浪湧(yong)電(dian)流沖(chong)擊，具有極(ji)低的(de)(de)(de)結(jie)電(dian)容，應(ying)用於(wu)保(bao)護電(dian)子設備(bei)和人身免遭瞬態高電(dian)壓的(de)(de)(de)危害，是防雷保(bao)護設備(bei)中(zhong)應(ying)用最廣泛(fan)的(de)(de)(de)開(kai)關(guan)元(yuan)器件。東沃電(dian)子GDT浪湧(yong)電(dian)流可(ke)達(da)20KA、40KA、50KA、60KA、100KA、150KA，甚(shen)至(zhi)更高；絕緣阻值(zhi)可(ke)達(da)到10G；極(ji)間電(dian)容低至(zhi)1PF；廣泛(fan)應(ying)用在(zai)通訊線路、通訊配(pei)線架的(de)(de)(de)保(bao)安單元(yuan)及高頻電(dian)路中(zhong)作防雷保(bao)護。