Abstract: The invention relates to a protective device (2) for an electrical circuit (1), including a first fuse (8), a pyroelectric switch (12) connected in parallel with the first fuse and comprising a control area (16), capable of receiving a trigger signal (S), and a power area (18) for the passage of the electric current. The device also comprises a control circuit configured to produce and transmit the trigger signal to the control area. The device includes a second fuse connected in series between a first input conductor (4) and the first fuse and capable of supplying a power supply voltage (V) to the control circuit, which is connected between the second fuse and the control area.

Abstract: The invention relates to a protective device (2) for an electrical circuit (1), including a first fuse (8), a pyroelectric switch (12) connected in parallel with the first fuse and comprising a control area (16), capable of receiving a trigger signal (S), and a power area (18) for the passage of the electric current. The device also comprises a control circuit configured to produce and transmit the trigger signal to the control area. The device includes a second fuse connected in series between a first input conductor (4) and the first fuse and capable of supplying a power supply voltage (V) to the control circuit, which is connected between the second fuse and the control area.

Abstract: The device for protecting a circuit includes a nonlinear resistance and a Zener diode. The nonlinear resistance is designed to be connected to the terminals of a power supply source of the circuit. The Zener diode and the nonlinear resistance each includes a first connecting end and a second connecting end. The first end of the Zener diode is connected to the second end of the nonlinear resistance. The device further includes a current limiter component, able to limit the intensity of the current passing through it. The current limiter component is connected between the second end of the nonlinear resistance and the second end of the Zener diode.

Abstract: A fault current limiter (FCL) for limiting a fault current in a power line during a fault condition. The FCL includes a magnetic coupling circuit for monitoring current in the power line through magnetic coupling; a sensing circuit for sensing the current in the power line and providing a signal indicative of the sensed current; a control circuit receiving the signal indicative of the sensed current in the power line and determining whether the sensed current indicates that the fault condition exists; and high and low impedance paths that are connected in parallel. The high impedance path includes a discharging impedance circuit for limiting the fault current. The low impedance path includes a reactor circuit and a switching unit having an ON state for conducting current through the low impedance path and an OFF state for conducting current through the high impedance path.

Abstract: A photovoltaic string monitor that provides PV-string level monitoring to detect abnormal operating conditions. The photovoltaic string monitor includes an indicator unit for indicating normal conditions, existing abnormal conditions or past occurrence of abnormal conditions. In one embodiment, the photovoltaic string monitor includes a plurality of lights and an LCD display.

Abstract: A fault current limiter (FCL) for limiting a fault current in a power line during a fault condition. The FCL includes a magnetic coupling circuit for monitoring current in the power line through magnetic coupling; a sensing circuit for sensing the current in the power line and providing a signal indicative of the sensed current; a control circuit receiving the signal indicative of the sensed current in the power line and determining whether the sensed current indicates that the fault condition exists; and high and low impedance paths that are connected in parallel. The high impedance path includes a discharging impedance circuit for limiting the fault current. The low impedance path includes a reactor circuit and a switching unit having an ON state for conducting current through the low impedance path and an OFF state for conducting current through the high impedance path.