During　the　breaking　course　of　electromagnetic　switch,　it　involves　in　several　physical　fields,　such　as　electricity,　magnetism,　heat,　fluid　and　mechanics.　Based　on　secondary　development　of　related　softwares,　a　multi-physics　collaborative　simulation　method　was　proposed　and　collaborative　system　was　established.　With　the　coupling　parameters　extracted,　the　design　of　the　electronic　control　module　has　been　integrated　into　three-dimensional　(3D)　dynamic　simulation.　Moreover,　the　3D　transient　moving　tracks　of　the　movable　contact　under　the　control　of　rapid　demagnetization　were　obtained　through　mechanical　dynamics　model　in　the　breaking　course.　The　results　of　simulations　and　experiments　indicate　that　the　breaking　time　can　be　reduced　and　the　breaking　speed　can　be　improved　significantly　with　negative　DC　voltage　exerted　on　both　ends　of　the　coil.　In　addition,　magnetohydrodynamics　and　dynamic　mesh　technology　have　been　introduced　to　the　simulation　for　calculating　the　distribution　of　arc　temperature　field　and　flow　field.　It　realizes　the　overall　analysis　of　electromagnetic　switch　during　the　breaking　course,　which　provides　theoretical　basis　for　the　improvement　of　breaking　characteristics　and　the　design　of　high-performance　intelligent　switches.　©　2017　Chin.　Soc.　for　Elec.　Eng.