Abstract: This invention relates to an acoustic device for estimating a trigger intensity of a trip current flowing in a circuit breaker, the device comprising: a casing (22); a plate (32); a support (40), a tab (42) connecting the support and the plate; a microphone (70); an attenuator (44), the support extending between the microphone and the attenuator, the attenuator comprising a housing (46) with a housing orifice (48) and an attenuating membrane (50); and an electronic control unit (38), connected to the microphone, the attenuator being configured to attenuate noise generated by the circuit breaker, the noise being representative of the trigger intensity, the microphone being configured to measure the noise attenuated by the attenuator, and emit an output signal, and the electronic control unit being configured to receive the output signal and estimate the trigger intensity.