The　permanent　magnet　operating　mechanism　applied　to　low　voltage　switch　is　generally　divided　into　monostable　and　bistable　permanent　magnet　mechanism.　For　the　opening　and　closing　of　the　bistable　permanent　magnet　mechanism,　two　independent　coils　are　generally　used　for　control.　However,　due　to　the　common　magnetic　circuit　of　the　opening　coil　and　the　closing　coil,　the　coil　coupling　will　occur　in　the　mechanism＇s　opening　and　closing,　so　that　the　coil　fluxs　loss.　This　paper　presents　the　design　method　of　a　magnetic　resistance　permanent　magnet　mechanism　for　low　voltage　switch.　By　improving　the　core　structure　of　the　mechanism,　the　flow　path　of　the　coil　flux　is　optimized　and　the　loss　caused　by　the　coil　coupling　is　reduced.　COMSOL　Multiphysics　software　was　used　to　build　a　permanent　magnet　mechanism　model　and　conduct　static　and　dynamic　simulation.　According　to　the　simulation　results,　the　action　characteristics　of　the　magnetic　resistance　mechanism　and　the　traditional　mechanism　were　compared.　©　Beijing　Paike　Culture　Commu.　Co.,　Ltd.　2025.