A circuit breaker, for interrupting an electrical circuit including electrical conductors, includes an energy converter, a primary side being formed by a conductor and a secondary side being connected to a power supply; a sensor for determining the level of the electric current of an electrical conductor; and a controller, connected to the power supply and the sensor, to cause an interruption of the electrical circuit when current limit values or current/time period limit values are exceeded. The secondary side of the energy converter is connected to the input of a measurement circuit, the output of the energy converter being connected to the controller. The measurement circuit determines an amount of energy and delivers this to the controller, the controller comparing the amount of energy with the level of the current determined by the sensor and emitting a warning signal when a first threshold value is exceeded.

The invention provides a low phase surge protection device including a voltage converter, a low phase delay detector and an output control switch. The voltage converter receives an alternate current (AC) input voltage, and converts the AC input voltage into a direct current (DC) input voltage. The low phase delay detector receives the DC input voltage to be a power source, enables a phase detection scheme by detecting whether the AC input voltage is in a stable state, and generates an enable signal by detecting a phase of the AC input voltage after the phase detection scheme is enabled. The output control switch receives the AC input voltage, and determines whether to transmit the AC input voltage to be an output voltage according to the enable signal.

A system for providing power from an AC power supply to an external load. The system includes a current limiter circuit, connected to an input of a switched-mode power supply. The system includes the switched-mode power supply that provides a first voltage signal and a second voltage signal. The system includes a supervisor circuit that is connected to the first output of the switched-mode power supply and coupled to a relay control circuit. The supervisor circuit monitors the first voltage signal and enables the relay control circuit. The relay control circuit provides a first voltage corresponding to the first voltage signal to a first voltage rail and provides a second voltage corresponding to the second voltage signal to a second voltage rail. A relay powered by a connection to the first voltage rail or the second voltage rail connects the AC power supply to an external load.

A fault protection system for providing protection from fault current for components and devices on a lateral line proximate to a distribution transformer in a power distribution network. The system includes a single-phase recloser having a vacuum interrupter that is controlled by a controller. In one embodiment, the recloser has an insulating body that is molded in combination with an insulating body of a bushing that is connected to the distribution transformer. In this embodiment, the controller can be powered by a current transformer within the recloser. In another embodiment, the recloser is mounted to a utility pole separate from the distribution transformer, where the controller is powered by the low voltage side of the transformer and the current transformer is eliminated. An isolated power supply is provided between the transformer and the controller to provide voltage isolation.

Disclosed herein are systems for maintaining protection of electric power delivery systems in the event of a control power failure or other anomaly. A reliable power module conditions electric power from multiple independent sources and provides electrical operational power to electric power delivery system protective loads. The reliable power module includes a power storage device for providing operational power even upon loss of all control power sources. The power storage may be sufficient to ride through expected losses such as a time to start up backup generation. The power storage may be sufficient to power a trip coil. Thus, electric power system protection is maintained even upon loss of control power.

Disclosed herein are systems for maintaining protection of electric power delivery systems in the event of a control power failure or other anomaly. A reliable power module conditions electric power from multiple independent sources and provides electrical operational power to electric power delivery system protective loads. The reliable power module includes a power storage device for providing operational power even upon loss of all control power sources. The power storage may be sufficient to ride through expected losses such as a time to start up backup generation. The power storage may be sufficient to power a trip coil. Thus, electric power system protection is maintained even upon loss of control power.

The present disclosure relates to an electrical protective circuit, comprising: an input terminal to which a main input voltage can be applied; a switching path arranged in parallel with the input terminal, wherein a controllable switch is configured to close the switching path; a sensor device connected to the input terminal and configured to detect an incorrect main input voltage present at the input terminal, wherein the sensor device is further configured to transmit a control signal to the controllable switch to close the switching path when an incorrect main input voltage is detected; and an energy supply device connected in parallel with the switching path and configured to convert a voltage drop across the closed controllable switch into a supply voltage and to apply the supply voltage to the sensor device.

The present disclosure relates to an electrical protective circuit, comprising: an input terminal to which a main input voltage can be applied; a switching path arranged in parallel with the input terminal, wherein a controllable switch is configured to close the switching path; a sensor device connected to the input terminal and configured to detect an incorrect main input voltage present at the input terminal, wherein the sensor device is further configured to transmit a control signal to the controllable switch to close the switching path when an incorrect main input voltage is detected; and an energy supply device connected in parallel with the switching path and configured to convert a voltage drop across the closed controllable switch into a supply voltage and to apply the supply voltage to the sensor device.

A cool running ground fault circuit interrupter (GFCI) with radio frequency (RF) noise suppression and a Capacitive Power Supply tbr interrupting the flow of current through a pair of load and neutral lines extending between an input power source and a load is provided. The GFCI includes a pair of switches disposed between the input power source and the load. The switches are actuated by a relay circuit initially powered by a booster circuit and a constant on power supply. A capacitive power supply for cool operation of the GFCI is connected to the load line via a current limiting resistor and provides power to the constant on power supply circuit.

A cool running ground fault circuit interrupter (GFCI) with radio frequency (RF) noise suppression and a Capacitive Power Supply tbr interrupting the flow of current through a pair of load and neutral lines extending between an input power source and a load is provided. The GFCI includes a pair of switches disposed between the input power source and the load. The switches are actuated by a relay circuit initially powered by a booster circuit and a constant on power supply. A capacitive power supply for cool operation of the GFCI is connected to the load line via a current limiting resistor and provides power to the constant on power supply circuit.