A circuit breaker and a power distribution system are provided. The circuit breaker includes a housing and an internal element disposed inside the housing. The housing includes a front panel and a rear panel that are disposed opposite to each other, the front panel is disposed with a button, a status display unit, and a power wiring port, and the rear panel is disposed with a power interface and a signal interface. The power wiring port and the power interface are connected to a circuit of a power distribution system. The signal interface is internally and electrically connected to the button, the status display unit, and the internal element, and the signal interface is externally configured to be electrically connected to a control unit disposed outside the housing. A control signal of the control unit implements working of the button, the status display unit, and the internal element.

A power switch including a line input configured to receive a line voltage, a load output configured to output the line voltage, a contact, a switch, a housing including a rear portion and a front cover coupled to the rear portion, an indicator supported by the front cover, the indicator configured to provide an indication of the power switch, and an indicator lens positioned between the indicator and the front cover. The contact is configured to selectively electrically connect the line input to the load output, the contact having a closed position in which the line input is electrically connected to the load output, and an open position in which the line input is not electrically connected to the load output. The switch is configured to selectively control the contract between the open position and the closed position.

A method for diagnosing the cause of tripping of an electrical protection device includes, after detection by the auxiliary device of a loss of electrical power, determining a type of electrical fault on the basis of recorded values, the determining operation including: comparing, with a first threshold value, the largest value of the maximum intensity of the current from the recorded values for a plurality of measurement intervals preceding the loss of power, a short circuit being diagnosed if the largest value of the maximum intensity is greater than a first threshold value; comparing, with a second threshold value, the largest RMS value of the current from the recorded values, an overload being diagnosed if the largest RMS value is greater than a second threshold value.

A circuit interrupter electrically connects a line terminal to a load terminal in a closed condition and electrically disconnects the line terminal from the load terminal in the open condition. A controller includes a fault detector configured to detect a fault in an electrical signal in a load circuit, such that when a fault is detected on the load circuit, the fault detector causes actuation of the interrupter to the open condition. The controller is adapted to receive an off command, and in response to the off command, generate a simulated fault in the load circuit, such that the fault detector causes actuation of the interrupter to the open condition, such that one and the same interrupter is employed for both fault tripping and commanded tripping.

An electronic protection device for a LV electric line including at least a phase conductor and a neutral conductor, comprising: input terminals and output terminals, at which said electronic protection device is electrically connected respectively with an electric power source and with an electric load through said phase and neutral conductors; a control unit comprising a controller including data processing resources; one or more pairs of main contacts electrically connected with corresponding one or more input and output terminals and adapted to be mutually coupled or separated; one or more pairs of auxiliary contacts electrically connected with corresponding one or more input terminals and with said control unit and adapted to be mutually coupled or separated; a handle movable in a first position corresponding to a closed state of said electronic protection device, in a second position corresponding to a tripped state of said electronic protection device or in a third position corresponding to an open state of said electronic protection device; an operating mechanism adapted to operate said main contacts, said auxiliary contacts and said handle; a tripping unit adapted to actuate said operating mechanism in response to an activation by said control unit. Said main contacts and said auxiliary contacts are coupled when said electronic protection device is in said closed state with said handle in said first position. Said main contacts are separated and said auxiliary contacts are coupled when said electronic protection device is in said tripped state with said handle in said second position. Said main contacts and said auxiliary contacts are separated when said electronic protection device is in said open state with said handle in said third position.

A method for detecting faults in a switch assembly comprising at least one switch for monitoring the position of a component that can be moved by means of a drive which has an electric motor. The method has the following steps: shifting the movable component from a first position to a second position spatially separated from the first position, wherein the power consumption of the electric motor changes in a previously specified manner, and wherein the switch state of the switch during a proper functioning of the switch changes in a previously specified manner, analyzing the power consumption of the electric motor and the switch state of the switch in an analysis unit, and triggering a fault action if the power consumption of the electric motor has changed in the previously specified manner and the switch state of the switch has not changed in the previously specified manner.

A power switch including a contact configured to selectively electrically connect a line input to a load output, a switch configured to selectively control the contract, and an indicator. The contact has a closed position in which the line input is electrically connected to the load output, and an open position in which the line input is not electrically connected to the load output. The switch has an on position wherein the contact is controlled to be in the closed position, and an off position wherein the contact is controlled to be in the open position. The indicator provides a normal on status, a normal off status, and an error on status.

A magnetic trip device comprises an actuator coil part having a plunger; an output plate configured to rotate in a first direction by the pressing of the plunger; a micro switch configured to output an electrical signal indicating a state of the circuit breaker; a switch driving lever mechanism configured to rotate to a first position for pressing the operation lever portion and a second position for releasing the operation lever portion; a driving lever bias spring for elastically pressing the switch driving lever mechanism; an automatic reset mechanism for pressing the plunger to the retracted position; a driving lever latch configured to rotate to a restraining position for preventing the switch driving lever mechanism from rotating to the first position, and a release position; and an avoiding portion formed on the output plate to avoid contacting with the switch driving lever mechanism.

A switchgear assembly includes an indicator assembly to indicate whether a movable contact is in an open or a closed position. The indicator assembly includes an indicator body having first and second sections. The indicator body is rotatable to display the first section in the open position and the second section in the closed position. The indicator assembly also includes a drive gear having a first helical spline and coupled to an actuator of the switchgear assembly such that operation of the actuator moves the drive gear, and an elongated driven gear having a second helical spline extending along a length of the driven gear and engaged with the first helical spline of the drive gear such that movement of the drive gear rotates the driven gear. The driven gear is coupled to the indicator body such that rotation of the driven gear causes rotation of the indicator body.

In an embodiment, a switching device includes at least one stationary contact, a movable contact, an armature, a permanent magnet and a magnetically-operated switch, wherein the movable contact is movable by the armature, wherein the permanent magnet is attached to the armature, and wherein the magnetically-operated switch is a Hall switch.