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汽車過載(zai)保護(hu)器是根據電氣控制行業的實際需要設計的電路保護裝置，采用單片機技術，功能齊全，動作可靠，抗干擾能力強，適應惡劣的工作環境。可對電氣系統，鼠籠電機，繞線電機的過電流，短路，缺相，相失衡，錯相及啟動過程( 避啟動過電流) 等提供有效的保護。

汽車過載保護器(qi)由電(dian)(dian)流互感器(qi)采(cai)(cai)樣信號(hao)(hao)(hao)，使(shi)每相負(fu)載電(dian)(dian)流轉(zhuan)換成(cheng)(cheng)與其成(cheng)(cheng)比(bi)(bi)例的電(dian)(dian)壓信號(hao)(hao)(hao)，將(jiang)該(gai)信號(hao)(hao)(hao)及所有控制信號(hao)(hao)(hao)輸(shu)入(ru)微處理(li)器(qi)，微處理(li)器(qi)對各種信號(hao)(hao)(hao)不斷地采(cai)(cai)集、計算(suan)和(he)存儲，并(bing)與相應的條件進(jin)行比(bi)(bi)較(jiao)，然(ran)后輸(shu)出結(jie)果。

電(dian)(dian)(dian)(dian)流(liu)(liu)整(zheng)(zheng)定(ding)應整(zheng)(zheng)定(ding)在負(fu)載滿載時的電(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)上，或根據負(fu)載額(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)整(zheng)(zheng)定(ding)。具體使用時，電(dian)(dian)(dian)(dian)流(liu)(liu)整(zheng)(zheng)定(ding)值(zhi)(zhi)以稍大(da)于額(e)定(ding)電(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)為(wei)宜。電(dian)(dian)(dian)(dian)流(liu)(liu)整(zheng)(zheng)定(ding)大(da)值(zhi)(zhi)為(wei)CT一次電(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)，為(wei)CT一次電(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)(zhi)的十分之一。

汽車過(guo)載保護器(qi)定(ding)時限：負(fu)載電流超(chao)過(guo)電流整定(ding)值起至脫扣所需(xu)的時間。可調范(fan)圍為OFF，0.2～30S。

汽車過載保護器反時限：實際電流5倍于電流整定值(zhi)所對應的脫(tuo)扣(kou)時間(jian)為(wei)脫(tuo)扣(kou)級(ji)別。可調(diao)范(fan)圍為(wei)1～4。

汽車過載(zai)保(bao)護器瞬動(dong)倍數：實際電(dian)流與電(dian)流整(zheng)定值(zhi)(zhi)的比值(zhi)(zhi)。可調范圍為(wei)OFF，2～9倍。

汽(qi)車過(guo)載(zai)保(bao)護(hu)器啟(qi)動(dong)時間：電動(dong)機(ji)或其他感性(xing)負(fu)載(zai)自通電至電流回落到額定(ding)電流所需的時間。可調范圍(wei)為OFF，1～200S。

汽(qi)車過(guo)載保護器(qi)三相電(dian)(dian)流不平衡(heng)(heng)達到50%且持續時間(jian)(jian)達到某一時間(jian)(jian)值，過(guo)載保護器(qi)自動脫(tuo)扣，該時間(jian)(jian)值相失衡(heng)(heng)時間(jian)(jian)。脫(tuo)扣時數碼管顯示電(dian)(dian)流值。