1、熱繼電器(qi)：普通(tong)小容量(liang)交流電機，良好(hao)工(gong)作條件，不存在頻(pin)繁啟動等(deng)惡(e)劣工(gong)況，由于精度(du)差，可靠(kao)性不能(neng)保證(zheng)，不推薦(jian)使用。

2、電(dian)(dian)(dian)子型(xing)(xing)：檢測(ce)三相(xiang)電(dian)(dian)(dian)流值，整定電(dian)(dian)(dian)流值采(cai)用(yong)電(dian)(dian)(dian)位器旋鈕或(huo)(huo)拔碼開關操作(zuo)，電(dian)(dian)(dian)路一般(ban)采(cai)用(yong)模擬(ni)式，采(cai)用(yong)反時限(xian)或(huo)(huo)定時限(xian)工作(zuo)特性。保護功能包括(kuo)過(guo)載、缺相(xiang)、堵轉等故(gu)障(zhang)保護，故(gu)障(zhang)類型(xing)(xing)采(cai)用(yong)指(zhi)示燈顯(xian)示，運行(xing)電(dian)(dian)(dian)量采(cai)用(yong)數碼管顯(xian)示。

3、智(zhi)能(neng)(neng)型：檢(jian)測三相(xiang)電(dian)流值，保(bao)護(hu)器使用(yong)(yong)單片機，實現(xian)電(dian)動(dong)機智(zhi)能(neng)(neng)化綜合保(bao)護(hu)，集保(bao)護(hu)、測量、通(tong)(tong)訊(xun)(xun)、顯(xian)示(shi)為(wei)一體。整定電(dian)流采用(yong)(yong)數字設(she)定，通(tong)(tong)過操(cao)(cao)作(zuo)面板按鈕來(lai)操(cao)(cao)作(zuo)，用(yong)(yong)戶可以根據自己(ji)實際使用(yong)(yong)要求和保(bao)護(hu)情況在現(xian)場自行對各種參數修正設(she)定，采用(yong)(yong)數碼管(guan)作(zuo)為(wei)顯(xian)示(shi)窗口，或采用(yong)(yong)大屏幕液(ye)晶顯(xian)示(shi)，能(neng)(neng)支持多種通(tong)(tong)訊(xun)(xun)協議，如(ru)ModBUS、ProfiBUS等，價(jia)格相(xiang)對高些，用(yong)(yong)于較(jiao)重要場合，如(ru)今高壓電(dian)動(dong)機保(bao)護(hu)均(jun)采用(yong)(yong)智(zhi)能(neng)(neng)型。

4、熱保(bao)護型(xing)：在電(dian)動(dong)機(ji)中(zhong)埋入熱元件，根據電(dian)動(dong)機(ji)的(de)溫(wen)度進行保(bao)護，保(bao)護效果好，但電(dian)動(dong)機(ji)容量較大時，需與電(dian)流監測型(xing)配(pei)合使用(yong)，避免(mian)電(dian)動(dong)機(ji)堵轉時溫(wen)度急劇上升，由于測溫(wen)元件的(de)滯(zhi)后(hou)性，導致(zhi)電(dian)動(dong)機(ji)繞(rao)組受損。

5、磁(ci)場(chang)溫(wen)(wen)度檢(jian)測(ce)型：在電動(dong)機(ji)中(zhong)埋(mai)入磁(ci)場(chang)檢(jian)測(ce)線圈和(he)(he)溫(wen)(wen)度探頭(tou)，根據電動(dong)機(ji)內部旋轉(zhuan)磁(ci)場(chang)的(de)變化和(he)(he)溫(wen)(wen)度的(de)變化進行保(bao)(bao)(bao)護，主要功(gong)能包括過載、堵轉(zhuan)、缺相、過熱(re)保(bao)(bao)(bao)護和(he)(he)磨損監(jian)測(ce)，保(bao)(bao)(bao)護功(gong)能完善，缺點是需在電動(dong)機(ji)內部安裝磁(ci)場(chang)檢(jian)測(ce)線圈和(he)(he)溫(wen)(wen)度傳感器。