RDT電(dian)(dian)(dian)(dian)(dian)流繼電(dian)(dian)(dian)(dian)(dian)器可(ke)用(yong)于(yu)TT、IT、和TNS系統中(zhong)(zhong)帶交替電(dian)(dian)(dian)(dian)(dian)流的(de)(de)LV網絡。他們可(ke)免于(yu)直接(jie)接(jie)觸，并可(ke)防止火災風險（通(tong)過地面的(de)(de)低電(dian)(dian)(dian)(dian)(dian)流不足干預磁熱能裝置(zhi)）。CEI64.8標(biao)準(zhun)表(biao)明電(dian)(dian)(dian)(dian)(dian)流探(tan)測器可(ke)作(zuo)(zuo)為(wei)額外(wai)的(de)(de)保護(hu)裝置(zhi)。所(suo)有的(de)(de)單(dan)相或三相系統電(dian)(dian)(dian)(dian)(dian)纜，必(bi)須通(tong)過環形(xing)區域，用(yong)較小的(de)(de)電(dian)(dian)(dian)(dian)(dian)流去控制較大(da)電(dian)(dian)(dian)(dian)(dian)流的(de)(de)一(yi)種"自動(dong)開關"。所(suo)以它在電(dian)(dian)(dian)(dian)(dian)路中(zhong)(zhong)起著自動(dong)調節、安全(quan)保護(hu)、轉換電(dian)(dian)(dian)(dian)(dian)路等(deng)作(zuo)(zuo)用(yong)，具有控制系統（輸入回路）和被控制系統（輸出(chu)回路）的(de)(de)功(gong)能。

Revalco公(gong)司(si)成立于1983年，總部設(she)在意大利的米蘭(lan)。主要(yao)專注用(yong)(yong)于電力(li)和(he)自動化行業的測量和(he)控制(zhi)的產品的設(she)計和(he)制(zhi)造，Revalco公(gong)司(si)采用(yong)(yong)了目前很新的技術，生產高品質(zhi)的產品，來(lai)滿足現有行業設(she)備(bei)的安裝及應用(yong)(yong)的需(xu)求(qiu)。主要(yao)產品包括開關、數字儀表(biao)、模擬儀表(biao)、電壓互感(gan)器、變壓器、鐵芯(xin)變壓器、避雷(lei)器，REVALCO計數器、定時器和(he)電源供(gong)應器等。