A self-powered switch device adapted to be included in a mechatronic circuit breaker characterized in that it comprises at least one self-powered switch module comprising: • a switching device having main terminals (A, K) adapted to be connected to a current path, and having a control terminal receiving a switching signal to selectively operate the switching device in a conductive state or a nonconductive state for controlling the conduction of current between the main terminals; • a power supply circuit having first and second circuit terminals respectively connected to the main terminals of the switching device, a serial LCR circuit connected to the first circuit terminal, comprising an inductor, a first resistor and a first capacitor and a full wave rectifier circuit connected in series with the LCR circuit and the second circuit terminal; wherein the full wave rectifier circuit comprises a first and a second diode-capacitor circuits connected in parallel, the first diode-capacitor circuit having a positive diode and a positive storage capacitor connected in series and the second diode-capacitor circuit having a negative diode and a negative storage capacitor connected in series, the positive storage capacitor and the negative storage capacitor being both connected to the second circuit terminal; and • a switch monitoring and driver module having an output connected to the control terminal of the switching device, two power terminals and a common terminal for receiving power connected in parallel with the positive storage capacitor and the negative storage capacitor respectively, and a signal terminal connected to a signal line to receive a control signal or send a switch state signal. • a switching device having main terminals (A, K) adapted to be connected to a current path, and having a control terminal receiving a switching signal to selectively operate the switching device in a conductive state or a nonconductive state for controlling the conduction of current between the main terminals; • a power supply circuit having first and second circuit terminals respectively connected to the main terminals of the switching device, a serial LCR circuit connected to the first circuit terminal, comprising an inductor, a first resistor and a first capacitor and a full wave rectifier circuit connected in series with the LCR circuit and the second circuit terminal; wherein the full wave rectifier circuit comprises a first and a second diode-capacitor circuits connected in parallel, the first diode-capacitor circuit having a positive diode and a positive storage capacitor connected in series and the second diode-capacitor circuit having a negative diode and a negative storage capacitor connected in series, the positive storage capacitor and the negative storage capacitor being both connected to the second circuit terminal; and • a switch monitoring and driver module having an output connected to the control terminal of the switching device, two power terminals and a common terminal for receiving power connected in parallel with the positive storage capacitor and the negative storage capacitor respectively, and a signal terminal connected to a signal line to receive a control signal or send a switch state signal.