The utility model discloses a vertical double -U -shaped electric pulse moulded case circuit breaker of mechanism, including spring mechanism, operating mechanism, quick -break mechanism, link mechanism and major loop, spring mechanism includes belleville spring, first fixed axle and second fixed axle, belleville spring middle part through first fixed axle with move connecting rod unshakable in one's determination and link to each other, it is fixed with the shell that belleville spring passes through at both ends the second fixed axle, the operating mechanism includes first quiet iron core, the quiet iron core of second, and the first iron core that moves, the second moves the iron core, moves connecting rod unshakable in one's determination, first coil and second coil, it is first that move unshakable in one's determinationly and the second moves the iron core and is fixed in and moves on the connecting rod unshakable in one's determination and lie in between first quiet iron core and the quiet iron core of second, its advantage lies in, through the combined action of spring mechanism, operating mechanism and quick -break mechanism, realizes that separating brake, combined floodgate and quick -break function are automatically controlled totally, can realize present moulded case circuit breaker's used function, on this basis, compares present spring mechanism moulded case circuit breaker, has simplified the structure, has improved the reliability.