A vehicle circuit breaker includes a housing configured with a electrode assembly including a first electrode and second electrode; the first electrode is configured with a first conducting element and first insertion portion, and the second electrode is configured with an electrode connection portion and second insertion portion; a bimetal conducting sheet and blocking element are configured inside the housing, where the bimetal conducting sheet has a plurality of conducting concave portions for the installment of a second conducting element and the connection with the electrode connection portion, thereby carrying out a blocking action when current is abnormal and therefore making it easier for assembly.