A leakage current protection device with an illumination function, including a shell, a movement assembly in the shell, power input and output assemblies coupled to the movement assembly, and an illumination assembly disposed inside the shell, which includes: an illumination control board electrically coupled to the power input or output assembly; a sensing unit coupled to the illumination control board and configured to sense an ambient condition outside the shell to generate a sensing output signal; a light emitting unit coupled to the control board, and controlled by the control board to turn on or off in response to the sensing output signal; and a light guide unit, formed by an operating element partially protruding out of the shell and disposed adjacent the light emitting unit, configured to guide the illumination light emitted by the light emitting unit out of the shell. The device is convenient to use and compact.

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.

Ground-fault circuit interrupter positioned between energy controlled supply circuit and load circuit which includes fault detection circuit that senses ground path current leakage to the load circuit, fault processing circuit that detects presence of fault and generates fault output signal when fault detected, and control circuit switch connected to fault processing signal output, wherein control circuit switch is opened by presence of fault output signal, thus isolating load circuit from supply circuit. Preferably fault processing circuit and control circuit are optically linked, such that when fault is detected, control circuit switch is opened by optical fault output signal, thus isolating load circuit from the supply circuit. Circuit interrupter may couple another circuit interrupter via power distribution control unit, optionally manageable remotely via automated control interface.

A circuit for a circuit interrupter is provided. The circuit may in include a first SCR configured to receive a first trigger signal at a gate of the first SCR, a second SCR configured to receive a second trigger signal at a gate of the second SCR, and a third SCR configured to receive a third trigger signal at a gate of the third SCR. A cathode of the first SCR may be connected to an anode of the third SCR. A cathode of the second SCR and a cathode of the third SCR may be connected to a ground. Methods of operating a circuit interrupter and a circuit are also provided.

Provided is a rotary maintenance type leakage protector which relates to a technical field of leakage protectors, and the rotary maintenance type leakage protector includes: a base, a leakage protection device, and an upper cover. The leakage protection device includes a reset key, a return rotation stopper, an electromagnetic driven device and an elastic piece, wherein the base is further provided with a conducting terminal that can be electrically connected with the elastic piece; each side of the return rotation stopper is provided with a protruding end that can be abutted against the elastic piece; the electromagnetic driven device is disposed on a side of an upper part of the base, and the electromagnetic driven device is provided with a driven iron core and can drive the driven iron core to move.

An electrical installation includes: a switchgear cabinet; a protective switch arranged in the switchgear cabinet; at least one optical triggering device which is operatively connected to the protective switch and for triggering or switching off the protective switch upon optical detection of an arc; a detection device for detecting an access or an access request to a secured area of the electrical installation by detecting a presence of the at least one optical triggering device in a danger area of the electrical installation; and an electronic circuit which is connected to the detection device and allows, and otherwise prevents, a triggering or switching off of the protective switch by the at least one optical triggering device upon detection of the access or the access request, when the at least one optical triggering device is present in the danger area.

An electrical installation includes: a switchgear cabinet; a protective switch arranged in the switchgear cabinet; at least one optical triggering device which is operatively connected to the protective switch and for triggering or switching off the protective switch upon optical detection of an arc; a detection device for detecting an access or an access request to a secured area of the electrical installation by detecting a presence of the at least one optical triggering device in a danger area of the electrical installation; and an electronic circuit which is connected to the detection device and allows, and otherwise prevents, a triggering or switching off of the protective switch by the at least one optical triggering device upon detection of the access or the access request, when the at least one optical triggering device is present in the danger area.

Disclosed herein is a leakage protector, which includes a housing. A base plate and a brush are arranged in the housing. A first conducting strip and a second conducting strip spaced apart are arranged on the base plate. The brush is provided with contact pins to contact the first conducting strip and the second conducting strip, respectively. The second conducting strip can generate different analog voltages, and the first conducting strip is configured to transmit different analog voltages to a microprocessor. A user can drive the brush to move through an actuating part, and set the power-on time of the leakage protector in one step.

The present disclosure relates to an earth leakage breaker having a leakage current limiting function, and the earth leakage breaker is provided to implement leakage current limiting parts at both ends of an earth leakage breaker part so that both an input terminal and an output terminal are each provided with the leakage current limiting function to increase leakage current limiting efficiency.

A method for calculating the steady-state fault current of a modular multilevel converter (MMC) comprises calculating the dc-side critical resistance values R.sub.A/B, R.sub.B/C and R.sub.C/D of the MMC based on the bridge arm inductance coefficient k and the ac-side reactance X.sub.ac of the MMC; Then, determining the operating modes of the MMC based on R.sub.A/B, R.sub.B/C and R.sub.C/D, and calculating the steady-state dc fault current and the conduction overlap angle respectively under various operating modes without considering the ac-side resistance based on the parameters k, U.sub.s, R.sub.dc and the dc-side critical resistance values R.sub.A/B, R.sub.B/C and R.sub.C/D; After that the steady-state AC fault current amplitude and phase angle for each operating mode without considering the AC side resistance are calculated based on the DC current and conduction overlap angle for each operating mode, respectively. Finally, the steady-state AC fault current amplitude and phase angle are calculated for various operating modes considering the AC side resistance.