多數(shù)斷路器控制回路中,跳閘線圈和斷路器輔助接點(diǎn)(用于在斷路器跳閘后切斷電流)相串聯(lián),以防止對(duì)弱電接點(diǎn)造成損害。這可以通過(guò)監(jiān)視斷路器輔助接點(diǎn)(斷路器跳閘后打開(kāi))來(lái)實(shí)現(xiàn)。但是，由于斷路器輔助接點(diǎn)狀態(tài)改變和跳閘回路電流中斷之間存在時(shí)差，該方案可能作出錯(cuò)誤操作。啟動(dòng)接點(diǎn)最可靠的保護(hù)方法是直接測(cè)量跳閘回路中的電流，用測(cè)量得出的參數(shù)去控制復(fù)歸啟動(dòng)繼電器。這個(gè)保護(hù)方案通常被稱為跳閘封鎖。

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