The　residual　current　circuit　breaker　with　permanent　magnet　is　the　most　widely　used　type　of　switchgear,　which　is　small　in　size,　cost-effective　and　flexible　in　operation.　However,　as　the　core　component　current　release　of　the　circuit　breaker,　the　operational　characteristics　of　the　current　release　are　affected　by　many　factors　such　as　magnetic　material　characteristics,　processing　technology,　environment,　etc.,　resulting　in　extremely　unstable　operation　characteristics.　In　this　paper,　the　overall　motion　performance　and　influencing　factors　are　analyzed　and　simulated　in　detail　through　the　establishment　of　3D　finite　element　model　of　current　release　with　permanent　magnet.　Moreover,　the　key　parameters　affecting　the　process　of　holding,　demagnetizing　and　tripping　are　sought,　by　changing　the　structural　parameters,　permanent　magnet　position　and　material　properties.　In　the　working　current　range,　aiming　at　reducing　the　tripping　time　and　expanding　the　adjustable　range　of　the　tripping　force,　the　relationship　between　the　key　parameters　of　the　release　are　explored,　and　the　theory　is　provided　to　improve　the　performance　index　of　the　release.　©　2019　by　International　Academic　Publishers　Ltd.