This　paper　focused　on　a　fast　mechanical　switch　applied　in　2kV　hybrid　DC　contactor.　An　integrated　design　of　vacuum　switch　based　on　Permanent　Magnetic　Actuator　(PMA)　is　proposed.　The　stainless　steel　bellows　is　removed　to　avoid　vacuum　failure　caused　by　air　leakage　and　eliminate　restriction　of　bellows＇　fatigue　life　compared　to　conventional　vacuum　switch.　Both　monostable　structure　and　compact　springs＇　position　contribute　to　achieve　smaller　size.　And　an　enclosure　vacuumized　inside　covers　the　entire　actuator　including　contact　parts.　Thus,　a　mechanical　switch　with　strong　compactness,　high　reliability　and　low　maintenance　is　obtained.　FEA　and　multibody　dynamics　analysis　methods　are　applied　to　analyze　static　and　dynamic　characteristics　of　the　PMA.　Mechanical　strength　analysis　demonstrates　that　integrated　vacuum　encapsulation　is　able　to　withstand　the　impact　force　derived　from　fast　operation.　The　study　results　prove　that　proposed　mechanical　switch　satisfies　requirement　of　a　2kV　hybrid　DC　contactor　and　has　reliable　structure.