Traditional　bi-stable　permanent　magnet　circuit　breakers　use　two　coils　that　share　a　common　magnetic　circuit　to　control　the　breaking　and　closing　operations　respectively.　The　electromagnetic　coupling　relationship　involved　in　the　dynamic　process　is　more　complex,　not　only　in　the　respective　magnetic　circuits,　there　is　mutual　coupling　between　the　permanent　magnet　magnetic　field　and　the　electromagnetic　field,　but　also　between　the　closing　and　breaking　coils.　Based　on　the　principle　of　minimum　magnetic　resistance,　this　article　designs　a　magnetic　circuit　separation　bi-stable　permanent　magnet　operating　mechanism,　adding　the　design　of　magnetic　isolation　to　improve　its　magnetic　field　coupling　and　reduce　the　effect　of　magnetic　field　coupling　on　the　motion　characteristics　of　the　mechanism.　This　article　uses　the　finite　element　simulation　software　COMSOL　Multiphysics　to　model　and　calculate　the　operating　mechanism,　and　produces　a　prototype　based　on　the　calculation　results.　The　experimental　results　of　the　prototype　demonstrate　that　the　addition　of　magnetic　isolation　design　meets　the　requirements　for　speed　characteristics,　while　the　response　time　is　faster　than　the　design　without　magnetic　isolation,　and　the　experimental　result　is　more　consistent　with　the　simulation　results.　©　Beijing　Paike　Culture　Commu.　Co.,　Ltd.　2024.