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 (TM) comprising: • a switching device (T1) having main terminals (A, K) adapted to be connected to a current path, and having a control terminal (G) 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 (PS) having first and second circuit terminals respectively connected to the main terminals of the switching device (T1), a serial LCR circuit connected to the first circuit terminal, comprising an inductor (L1), a first resistor (R1) and a first capacitor (C1) 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 (D2) and a positive storage capacitor (C2) connected in series and the second diode-capacitor circuit having a negative diode (D3) and a negative storage capacitor (C3) connected in series, the positive storage capacitor (C2) and the negative storage capacitor (C3) being both connected to the second circuit terminal; and • a switch monitoring and driver module (M) having an output connected to the control terminal (G) of the switching device, two power terminals and a common terminal for receiving power connected in parallel with the positive storage capacitor (C2) and the negative storage capacitor (C3) respectively, and a signal terminal connected to a signal line to receive a control signal or send a switch state signal. • a switching device (T1) having main terminals (A, K) adapted to be connected to a current path, and having a control terminal (G) 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 (PS) having first and second circuit terminals respectively connected to the main terminals of the switching device (T1), a serial LCR circuit connected to the first circuit terminal, comprising an inductor (L1), a first resistor (R1) and a first capacitor (C1) 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 (D2) and a positive storage capacitor (C2) connected in series and the second diode-capacitor circuit having a negative diode (D3) and a negative storage capacitor (C3) connected in series, the positive storage capacitor (C2) and the negative storage capacitor (C3) being both connected to the second circuit terminal; and • a switch monitoring and driver module (M) having an output connected to the control terminal (G) of the switching device, two power terminals and a common terminal for receiving power connected in parallel with the positive storage capacitor (C2) and the negative storage capacitor (C3) respectively, and a signal terminal connected to a signal line to receive a control signal or send a switch state signal. <EOS>