Acoustic device for estimating a trigger intensity, electrical protection assembly and associated electrical installation

An acoustic device for estimating a trigger intensity of a trip current flowing in a circuit breaker, the device comprising:

• a casing configured to be attached to the circuit breaker;
• a plate, integrated inside the casing, the plate extending along a main plane;
• a support, integrated inside the casing, the support extending parallel to the main plane, a tab connecting the support and the plate, the support being connected to the plate only via the tab;
• a microphone, fixed to the support;
• an attenuator, fixed to the support, the support extending between the microphone and the attenuator, the attenuator comprising:
• a housing with a housing orifice, passing through and extending along a housing axis, and
• an attenuating membrane, received in the housing and covering the housing orifice;
• and
• an electronic control unit, 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 representative of the attenuated noise, and the electronic control unit being configured to receive the output signal emitted by the microphone and estimate the trigger intensity of the circuit breaker's trip current from the output signal.