一、半自動(dong)電動(dong)起(qi)子

在達到設定扭力后不會自(zi)動(dong)(dong)(dong)剎車停止的起子，稱(cheng)之為半自(zi)動(dong)(dong)(dong)電動(dong)(dong)(dong)起子。通常半自(zi)動(dong)(dong)(dong)設計為手按式。半自(zi)動(dong)(dong)(dong)有分AC高壓直插式，與(yu)經過電源變(bian)壓為DC低壓式。

二、全自動電動起子

在(zai)達到設(she)定(ding)扭力后能(neng)夠(gou)完全自動(dong)剎車并停(ting)止運轉的電動(dong)起子(zi)稱為全自動(dong)電動(dong)起子(zi)。全自動(dong)電動(dong)起子(zi)又分(fen)為AC高壓和(he)DC低(di)壓兩個系列，根據操作啟(qi)動(dong)模式(shi)的不(bu)同又分(fen)為手(shou)按式(shi)和(he)下壓式(shi)兩種。

高(gao)(gao)壓(ya)系列(lie)電(dian)動(dong)(dong)起(qi)(qi)子(zi)不需要單(dan)獨電(dian)源供應器轉換電(dian)壓(ya)，直接與市(shi)電(dian)連接，操(cao)作(zuo)(zuo)快捷占用空間小(xiao)(xiao)。低壓(ya)系列(lie)電(dian)動(dong)(dong)起(qi)(qi)子(zi)體積小(xiao)(xiao)重量輕，由直流馬達驅動(dong)(dong)，壽命(ming)長(chang)安全(quan)系數高(gao)(gao)。手按(an)式(shi)電(dian)動(dong)(dong)起(qi)(qi)子(zi)操(cao)作(zuo)(zuo)啟動(dong)(dong)時(shi)只需用手指(zhi)按(an)住啟動(dong)(dong)杠(gang)桿，或壓(ya)板(ban)按(an)鈕等。下壓(ya)式(shi)電(dian)動(dong)(dong)起(qi)(qi)子(zi)操(cao)作(zuo)(zuo)啟動(dong)(dong)時(shi)無需用手指(zhi)按(an)住啟動(dong)(dong)杠(gang)桿，或壓(ya)板(ban)按(an)鈕等，直接對準工件壓(ya)下就可啟動(dong)(dong)。