A protection circuit 100 of a power storage device 20 equipped with external terminals 58A, 58B, the protection circuit 100 being equipped with a return circuit 110 connected in parallel to a load 12 connected between the external terminals, and also equipped with a switching circuit 120, wherein: the return circuit 110 is equipped with a return element 111 which causes an induced current produced when the current to the load 12 is blocked to return to the load 12, and a current-blocking part 115 which is connected in series to the return element 111; and the switching circuit 120 switches the current-blocking part 115 from conducting to blocking after a delay of a prescribed interval from when a reverse voltage is applied to the external terminals 58A, 58B.

In order to reduce the occurrence of component failure, this undersea device is provided with one or more temporarily energized units which are temporarily energized during use, and an energization switching unit which, when a predetermined operation is performed, supplies power to at least one temporarily energized unit, and which, upon completion of the operation, terminates supply of power to the at least one temporarily energized unit.

A fault protection arrangement may include a neutral grounding resistor, the neutral grounding resistor comprising a ground end and a non-ground end. The fault protection arrangement may include a neutral grounding resistance monitor assembly, coupled to the neutral grounding resistor, where the neutral grounding resistance monitor assembly includes a sense circuit, coupled to the ground end of the neutral grounding resistor; and an injection signal generator, arranged to generate a frequency of 240 Hz or greater.

A reverse polarity protection device includes a protection unit, a detection unit, and a control unit electrically connected between a power supply device and a load device. The detection unit is electrically connected to the power supply device for detecting the polarity of an output signal of the power supply device, and the control unit is electrically connected to the detection unit and the protection unit. The detection unit outputs a detection signal to the control unit according to a detection result of the polarity of the output signal. If the detection signal shows that the polarity of the output signal is reverse, the control unit will control the protection unit to form an open circuit between the power supply device and load device to stop transmitting the output signal of the power supply device to the load device and achieve a reverse polarity protection effect of the load device.

A circuit breaker is provided that may be plugged onto an electrical panel. The circuit breaker is preferably a low voltage circuit breaker in the range of 120-240 volts. The circuit breaker has an electrical clip with a curved inner surface that contacts a curved outer surface of an electrical connector on the electrical panel.

A power distribution system includes a first intelligent circuit breaker; a plurality of second intelligent circuit breakers, the second intelligent circuit breaker is structured to transmit the circuit breaker information to the first intelligent circuit breaker; and an energy monitoring device coupled to the first and second intelligent circuit breakers and structured to receive the circuit breaker information, the energy monitoring device including a dynamic coordination system structured to: (i) determine whether an adjustment to configuration setting of an intelligent circuit breaker is required based at least in part on the circuit breaker information, (ii) identify the intelligent circuit breaker with the configuration setting required to be adjusted based on a determination that the adjustment is required, and (iii) transmit an alert to user, indicating that the adjustment to the configuration setting of the identified intelligent circuit breaker is required and device address of the identified intelligent circuit breaker.

Provided is a protection circuit capable of reliably preventing an overcurrent or a sneak current after cutoff to improve safety, implementing cost reduction with a device configuration simpler than conventional device configurations, and further reducing a failure rate of a device. In a protection circuit, after one of two fuse elements provided in each of a plurality of protection elements is blown due to an overcurrent flowing along a current-carrying path, a heater provided in at least one of the plurality of protection elements generates heat due to a sneak current flowing via the plurality of protection elements on the current-carrying path which is remained and blows the other of the two fuse elements provided in the at least one of the plurality of protection elements.

A power system including a gate driver configured with test circuitry to detect faults is disclosed. The power system may be configured to test the fault detection circuitry in order to confirm its ability to detect faults. Various methods and circuit implementations are disclosed to determine the ability of the system to detect faults. The testing may include different configurations and protocols in order to make conclusions about which components are likely responsible for a failure. These components may include components included in the gate driver or externally coupled to the gate driver. The disclose approach does not significantly add complexity because a test input to initiate a test may be communicated from a low voltage side to a high voltage side over a shared communication channel.

An electrical circuit protection device a processor-based controller configured to operate at least one solid state switching element in a manner responsive to a variety of different time-current conditions to protect a plurality of different electrical loads. A field deployable adaptor device is configured to communicate with the controller. The controller is configured with at least one pre-preprogrammed control algorithm or at least one selected setting for a control algorithm executable by the controller. At least one pre-preprogrammed control algorithm or at least one selected setting are predetermined by a manufacturer of the circuit protector device.

A current sense short protection circuit includes a switch unit, a current sensing unit, a detection circuit and a short detection module. The first terminal of the switch unit receives a first voltage. The control terminal of the switch unit receives a control signal. The first terminal of the current sensing unit is coupled to the second terminal of the switch unit. The second terminal of the current sensing unit receives a second voltage. The detection unit receives the second voltage and a third voltage provided by the first terminal of the current sensing unit, and generates a detection signal according to the second voltage and the third voltage. The short detection module receives the first voltage, the second voltage and the detection signal, and generates a short detection signal according to the first voltage, the second voltage and the detection signal.