Methods for estimating a property of an electrial switching device, associated devices

A method for estimating a property of an electrical switching device, said device including an electromagnetic actuator comprising a coil, the method comprising:

• measuring the electric current flowing through the coil;
• measuring the supply electrical voltage of a control circuit for the actuator;
• injecting an electric current pulse into the coil of the actuator;
• identifying a first time corresponding to the time for which the current flowing through the coil reaches a predetermined threshold value when said current increases following the injection of the pulse;
• identifying a second time corresponding to the time for which the current flowing through the coil again reaches the predetermined threshold value when said current decreases after the spike of the pulse;
• and
• estimating the resistance of the coil on the basis of the ratio of the sum of the values of said voltage that are measured between the second time and the first time, to the sum of the values of said current that are measured between the second time and the first time.