The　low-voltage　DC　distribution　system　based　on　renewable　energy　has　been　widely　developed　because　of　the　serious　energy　problem,　in　which　circuit　breakers　play　an　important　protective　role.　With　the　increase　in　breaking　capacity,　compared　with　traditional　mechanical　circuit　breakers,　hybrid　circuit　breakers　have　a　longer　service　life　and　excellent　breaking　performance.　Therefore,　it　is　of　great　significance　to　study　the　breaking　performance　of　hybrid　circuit　breaker.　In　this　paper,　a　simulation　model　integrating　arc　model　and　behavior　model　of　power　electronic　devices　is　established.　The　factors　affecting　the　interruption　characteristics　mainly　include　line　parameters　and　device　parameters,　which　are　analyzed　by　the　above　hybrid　circuit　breaker　model.　Among　these　factors,　the　time　constant　mainly　affects　the　electric　characteristics　at　commutation　time.　With　the　clamp　voltage　of　MOV　increasing,　the　energy　dissipation　time　decreases　obviously.　The　large　stray　inductance　and　parasitic　capacitance　have　influence　on　the　commutation　process,　which　will　extend　the　commutation　time.　This　study　may　provide　references　for　the　selection　and　optimization　of　hybrid　circuit　breaker　parameters　and　the　improvement　of　breaking　performance.　©　2022　IEEE.