In an electrical distribution system including a solid-state circuit breaker (SSCB) and one or more downstream mechanical circuit breakers (CBs), a solid-state switching device in the SSCB is repeatedly switched ON and OFF during a short circuit event, to reduce a root-mean-square (RMS) value of the short circuit current. The resulting pulsed short circuit current is regulated in a hysteresis control loop, to limit the RMS to a value low enough to prevent the SSCB from tripping prematurely but high enough to allow one of the downstream mechanical CBs to trip and isolate the short circuit. Pulsing is allowed to continue for a maximum short circuit pulsing time. Only if none of the downstream mechanical CBs is able to trip to isolate the short circuit within the maximum short circuit pulsing time is the SSCB allowed to trip.

In a circuit breaker arrangement, this disclosure describes a method and circuit design enables a current transformer to be used to detect ground faults in circuit breakers (such as a main-tie-main circuit breakers) that have been designed to receive signals from Rogowski coils.

An electrical wiring device including a ground fault interrupt assembly, the ground fault interrupt assembly comprising a ground fault interrupt circuit, being formed on a first printed circuit board, and a trip mechanism, the ground fault interrupt circuit being configured to detect a differential current between the line conductor and the neutral conductor and to trigger the trip mechanism to electrically decouple the plurality of line terminals from the plurality of load terminals, according to a predetermined criterion, based, at least in part, on the different current; and a USB power supply circuit being formed on a second printed circuit board disposed within the compartment, the USB power supply circuit providing to the at least one USB port, wherein the first printed circuit board and the second printed circuit board are separated by a distance within the inner compartment.

An electronic control unit having a self-diagnosis function is realized in which an operation processing section is capable of identifying not only the presence or absence of the occurrence of NG of disconnection, an earth fault, and a power fault, but also three states of NG, OK, and indetermination. Therefore, when a diagnosis opportunity is present, a mask signal maintains a state of Not Mask even if the mask signal is subsequently brought into a mask state. When an operation processing device requests a drive circuit for communication therewith, the mask signal is set to the state of Mask, and information stored in a register is cleared. Further, when the mask signal is in the state of Mask when the operation processing device performs communication with the drive circuit, the operation processing device is capable of identifying that an indeterminate state free of the opportunity of the diagnosis is present.

The present disclosure is generally directed to a GF detection circuit for use in blenders and other appliances that can detect current leak/GF events and selectively decouple/de-energize components of the blender that could bring a user in contact with dangerous electrical currents. Preferably, a blender consistent with the present disclosure includes at least one ground plane, e.g., in the form of conductive material/sections, disposed on the blender and/or blender jar that act as an input to a GF detection circuit that is at least partially implemented within the base of the blender.

An electrical protection apparatus includes at least one first or main electrical protection function able to be carried out by a microcontroller and a button termed a test button intended to be actuated by a user to give rise to the implementation of the testing of at least one second electrical function, this implementation of the test being intended to give rise to the tripping of the protection apparatus D. The electrical protection apparatus includes a device for pooling the actuation of this test button with at least one action intended to carry out a third function, as a function of various types of action exerted on the test button, these actions being detected by the microcontroller, the aim being for the latter to give the order to carry out one of the third functions or else the testing of one of the second functions.

The present disclosure relates to an earth leakage breaker and an arc detection apparatus attachable/detachable to/from the earth leakage breaker. An earth leakage breaker and an arc detection apparatus according to one embodiment of the present disclosure comprise: a body of the earth leakage breaker; and an arc detection module attachably/detachably coupled to the body of the earth leakage breaker so as to detect an arc current, wherein the arc detection module comprises: an arc detection unit connected to a first load side terminal of the body of the earth leakage breaker so as to detect an arc current flowing through a line; a control unit for determining an arc current on the basis of an arc detection signal delivered by the arc detection unit; and an output unit for outputting a signal or a current, according to a control signal of the control unit.

A circuit interrupt device provides a controller and method thereof that is programmed to receive a plurality of data sequences, each data sequence containing a set of data points corresponding to a waveform of line current flowing through the circuit interrupt device. The controller performs spectral reduction on the plurality of data sequences using a finite series transform to reduce bandwidth requirement and transmits a spectrally reduced version of the plurality of data sequences to an external system using reduced bandwidth. The data can then be processed and converted to meta data for monitoring and tracking purposes.

Electric power generator protection is secured by detecting wiring errors to an intelligent electronic device using terminal third voltages at the terminal (VT3) and third harmonic voltages at the neutral (VN3). When an angle between VT3 and VN3 is outside of an acceptable range, a wiring defect is detected, and certain protective operations are blocked. An alarm may be generated, facilitating personnel to identify and rectify the wiring defect. Wiring defects may further be detected when a torque calculated using VT3 and VN3 exceeds a predetermined error threshold. Security of protection elements is increased by detection of wiring defects that may have resulted in misoperation of the protection elements.

Example embodiments of the invention perform updating of arc-fault detection protection software in a dual function/combination arc-fault circuit interrupter (DF/CAFI) device, without requiring any hardware changes to the device. Maintenance software running in a processor in the device synchronizes downloading the updated protection software as packets of modulated data from a host device, downloaded over an electric power line connected to the device. The modulated data on the power line is sensed by a current sensor of the device and is filtered, demodulated, and sampled by the device. The maintenance software then assembles packets of the demodulated and sampled data and loads them into memory in the device as the updated arc-fault detection protection software.