A thermal-magnetic trip device for monitoring several phase currents flowing in a multiphase circuit breaker and for tripping this multiphase circuit breaker in case of an anomaly affecting at least one of the phase currents, comprising: - several phases, - several thermal actuators each of which is designed to react to a current overload in one of the phases by generating a mechanical tripping command (P 1, P 2), - several magnetic actuators each of which is designed to react to a short-circuit in one of the phases by generating a mechanical tripping command (P 1, P 2), - an intermediate transmission device configured to be able to receive any one of the mechanical tripping commands (P 1, P 2) and comprising a ratchet flexibly biased in a first direction (S 1) to a latched position, and arranged in such a way that receipt of a tripping command (P 1, P 2) by the transmission device makes this ratchet move from its latched position, in which the ratchet can secure a tripping part in a neutral state by latching, to a released position in which the tripping part is disengaged from the ratchet, - a support shaft on which the ratchet is fitted so as to be able to swivel around a pivoting axis (Y 2 -Y' 2) between its latched and released positions, characterized in that it comprises: - a first indicator designed to indicate tripping caused by a current overload, and - a second indicator designed to indicate tripping caused by a short-circuit, the intermediate transmission device comprising: - a first transmission bar fitted on said support shaft so as to be able to be pivoted around the same pivoting axis (Y 2 -Y' 2) as the ratchet, in a second direction (S 2) opposite to the first direction (S 1), by any one of the thermal actuators, with a movement in the course of which this first transmission bar both drives the ratchet from its latched position to its released position and makes the first indicator change state, and - a second transmission bar fitted on said support shaft so as to be able to be pivoted around the same pivoting axis (Y 2 -Y' 2) as the ratchet, in the second direction (S 2), by any one of the magnetic actuators, with a movement in the course of which this second transmission bar both drives the ratchet from its latched position to its released position and makes the second indicator change state. the first and second transmission bars (31, 32) being disconnected from one another in pivoting around the pivoting axis (Y 2 -Y' 2). - several phases, - several thermal actuators each of which is designed to react to a current overload in one of the phases by generating a mechanical tripping command (P 1, P 2), - several magnetic actuators each of which is designed to react to a short-circuit in one of the phases by generating a mechanical tripping command (P 1, P 2), - an intermediate transmission device configured to be able to receive any one of the mechanical tripping commands (P 1, P 2) and comprising a ratchet flexibly biased in a first direction (S 1) to a latched position, and arranged in such a way that receipt of a tripping command (P 1, P 2) by the transmission device makes this ratchet move from its latched position, in which the ratchet can secure a tripping part in a neutral state by latching, to a released position in which the tripping part is disengaged from the ratchet, - a support shaft on which the ratchet is fitted so as to be able to swivel around a pivoting axis (Y 2 -Y' 2) between its latched and released positions, - a first indicator designed to indicate tripping caused by a current overload, and - a second indicator designed to indicate tripping caused by a short-circuit, - a first transmission bar fitted on said support shaft so as to be able to be pivoted around the same pivoting axis (Y 2 -Y' 2) as the ratchet, in a second direction (S 2) opposite to the first direction (S 1), by any one of the thermal actuators, with a movement in the course of which this first transmission bar both drives the ratchet from its latched position to its released position and makes the first indicator change state, and - a second transmission bar fitted on said support shaft so as to be able to be pivoted around the same pivoting axis (Y 2 -Y' 2) as the ratchet, in the second direction (S 2), by any one of the magnetic actuators, with a movement in the course of which this second transmission bar both drives the ratchet from its latched position to its released position and makes the second indicator change state.