A trip mechanism for direct current molded case circuit breaker, wherein the trip mechanism comprising: a trip mechanism part including an instantaneous trip mechanism (22, 24, 25, 28) connected to a circuit, the instantaneous trip mechanism (22, 24, 25, 28) including a movable member (24a, 24b) to operate according to a fault current requiring instantaneous breaking which flows on the circuit, and a thermal trip mechanism (21, 27) connected to the circuit, the thermal trip mechanism (21, 27) including a bimetal to operate according to an over current flowing on the circuit, the trip mechanism part being provided for only one of two adjacent poles; a crossbar that is rotatable by contacting and pressing of the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28) or the bimetal of the thermal trip mechanism (21, 27); and a shooter that is provided to be rotatable by contacting of the crossbar rotating, the shooter provides an output of the trip mechanism, wherein the trip mechanism further comprises an enclosure, wherein, in the enclosure, an insulation partition wall is provided between poles, and the enclosure comprises a rear wall portion (20a1), and wherein an inter-pole insulation wall portion (20a2) is provided in plurality on a rear surface of the rear wall portion (20a1) to protrude in a backward direction and an inter-pole insulation wall portion (20a3) is provided in plurality on a front surface of the rear wall portion (20a1) to protrude in a forward direction (20a3), wherein the crossbar comprises: a first power receiving portion that is provided in corresponding to the bimetal of the thermal trip mechanism(21, 27), the first power receiving portion formed to protrude upwardly, and the first power receiving portion receiving a pressing force from the bimetal; a second power receiving portion that is provided in corresponding to the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28), the second power receiving portion formed to protrude upwardly, and the second power receiving portion receiving a pressing force from the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28); and an output protrusion portion that is provided to face the shooter and provided to upward protrude from the crossbar, the output protrusion portion providing an output of the crossbar which drives the shooter to rotate. a trip mechanism part including an instantaneous trip mechanism (22, 24, 25, 28) connected to a circuit, the instantaneous trip mechanism (22, 24, 25, 28) including a movable member (24a, 24b) to operate according to a fault current requiring instantaneous breaking which flows on the circuit, and a thermal trip mechanism (21, 27) connected to the circuit, the thermal trip mechanism (21, 27) including a bimetal to operate according to an over current flowing on the circuit, the trip mechanism part being provided for only one of two adjacent poles; a crossbar that is rotatable by contacting and pressing of the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28) or the bimetal of the thermal trip mechanism (21, 27); and a shooter that is provided to be rotatable by contacting of the crossbar rotating, the shooter provides an output of the trip mechanism, wherein the trip mechanism further comprises an enclosure, wherein, in the enclosure, an insulation partition wall is provided between poles, and the enclosure comprises a rear wall portion (20a1), and wherein an inter-pole insulation wall portion (20a2) is provided in plurality on a rear surface of the rear wall portion (20a1) to protrude in a backward direction and an inter-pole insulation wall portion (20a3) is provided in plurality on a front surface of the rear wall portion (20a1) to protrude in a forward direction (20a3), wherein the crossbar comprises: a first power receiving portion that is provided in corresponding to the bimetal of the thermal trip mechanism(21, 27), the first power receiving portion formed to protrude upwardly, and the first power receiving portion receiving a pressing force from the bimetal; a second power receiving portion that is provided in corresponding to the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28), the second power receiving portion formed to protrude upwardly, and the second power receiving portion receiving a pressing force from the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28); and an output protrusion portion that is provided to face the shooter and provided to upward protrude from the crossbar, the output protrusion portion providing an output of the crossbar which drives the shooter to rotate. a first power receiving portion that is provided in corresponding to the bimetal of the thermal trip mechanism(21, 27), the first power receiving portion formed to protrude upwardly, and the first power receiving portion receiving a pressing force from the bimetal; a second power receiving portion that is provided in corresponding to the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28), the second power receiving portion formed to protrude upwardly, and the second power receiving portion receiving a pressing force from the movable member (24a, 24b) of the instantaneous trip mechanism (22, 24, 25, 28); and an output protrusion portion that is provided to face the shooter and provided to upward protrude from the crossbar, the output protrusion portion providing an output of the crossbar which drives the shooter to rotate.