Method and device for diagnosing wear of an electrical switching unit, and electrical unit comprising such a device

A device for diagnosing the wear status of an electrical switching unit connected to an electromagnetic coil for actuating contacts of said electrical switching unit, the diagnostic device comprising:

• a processing circuit for implementing a diagnosis of the wear status of an electrical switching unit implemented by monitoring said electrical unit, wherein said monitoring uses:
• learning data previously loaded and corresponding to a type of product representative of said electrical unit, and initialization data corresponding to said unit to be monitored and stored in memory during an initialization phase, and wherein said monitoring includes:
• acquiring measurement curve upon the opening of said electrical unit, the determination of values of local descriptors from said measurement curve as a function of values of said measurement curve, of stored initialization data, and of first loaded learning data, at least one of said local descriptors being a descriptor with low sensitivity to the differences in temperature and dependent on points of said measurement curve, determining the positioning of the values of local descriptors with low sensitivity to the temperature of the measurement curve with respect to second learning data and determining a global status class as a function of said positioning values of the values of local descriptors and of the measurement:
• curve with respect to said second learning data,
• wherein the processing circuit thither comprises a local diagnostic processing module coupled directly to said electrical switching unit and connected to an external processing module remote from said electrical switching unit.