An electrical control and protection device suitable for being positioned in an electrical installation comprising a set (2, 3) of electrical conductor(s), said device comprising: - means for measuring the voltage and/or current (17, 18) and at least one conductor of said conductor assembly; - a processing module, suitable for detecting an electric arc in the electrical installation based at least on measurements done by said measuring means and, if an electric arc is detected, generating an activation signal (TRIP) and transmitting said activation signal to an electric switching device suitable for stopping the flow of the electric current in at least said conductor of said set of electric conductors in response to the reception of said detection signal; said electrical control and protection device comprising the processing module suitable for further detecting, based at least on some of said voltage and/or current measurements in the conductor done by said measuring means, at least one malfunction from among a short circuit, an electric current overload, an overvoltage, an undervoltage and a residual current relative to at least said conductor of said set of electrical conductors, the processing module being further suitable for generating, if said malfunction is detected, an activation signal (TRIP) and transmitting said activation signal to an electric switching device suitable for stopping the flow of the electric current in at least the conductor of said set of electric conductors (2, 3) in response to the reception of said detection signal, the processing module being suitable, following the detection of a malfunction, for generating and transmitting a diagnostic signal comprising information characterizing the nature of the malfunction, the electrical control and protection device comprising primary means for supplying the electricity coming from the electrical installation to power the processing module, the electrical control and protection device being characterized in that it comprises secondary means for supplying electricity further suitable for storing said electricity, said secondary electricity supply means being suitable for powering at least the processing module when, following the transmission of an activation signal, the power supply of the primary means by the installation is stopped, and the secondary electricity supply means being sized to power the processing module, at least, following the transmission of an activation signal by the processing module, and until transmission of the diagnostic signal. - means for measuring the voltage and/or current (17, 18) and at least one conductor of said conductor assembly; - a processing module, suitable for detecting an electric arc in the electrical installation based at least on measurements done by said measuring means and, if an electric arc is detected, generating an activation signal (TRIP) and transmitting said activation signal to an electric switching device suitable for stopping the flow of the electric current in at least said conductor of said set of electric conductors in response to the reception of said detection signal; the processing module being further suitable for generating, if said malfunction is detected, an activation signal (TRIP) and transmitting said activation signal to an electric switching device suitable for stopping the flow of the electric current in at least the conductor of said set of electric conductors (2, 3) in response to the reception of said detection signal, the processing module being suitable, following the detection of a malfunction, for generating and transmitting a diagnostic signal comprising information characterizing the nature of the malfunction, the electrical control and protection device comprising primary means for supplying the electricity coming from the electrical installation to power the processing module, the electrical control and protection device being characterized in that it comprises secondary means for supplying electricity further suitable for storing said electricity, said secondary electricity supply means being suitable for powering at least the processing module when, following the transmission of an activation signal, the power supply of the primary means by the installation is stopped, and the secondary electricity supply means being sized to power the processing module, at least, following the transmission of an activation signal by the processing module, and until transmission of the diagnostic signal.