A device has an electric power supply line between an electrical load and a DC voltage source with a positive pole and a negative pole. The supply line delivers the requisite electrical energy for the operation of the load. The electric power supply line includes at least four adjacently routed, identically configured and insulated individual conductors of equal length, wherein at least two individual conductors connect the positive pole to the load, and at least two individual conductors connect the negative pole to the load. Each of the individual conductors forms an independent electrical connection between the DC voltage source and the electrical load.

An electrical arc detector for switchgear includes a fiber-optic cable configured to receive light emitted from switchgear at a first end and transport the light to a second end. The detector further includes a sensor arranged adjacent the second end of the fiber-optic cable configured to sense the light and generate an electrical signal, and analog-to-digital converter configured to convert the electrical signal to a digital signal, and a processor configured to monitor the digital signal and at least one of transmit information related to the digital signal, store information related to the digital signal, and take action based on the digital signal.

An electronic circuit includes a number of sensors structured to detect an arc flash from an uncontrolled arcing fault, and a trigger circuit, responsive to the detected arc flash, structured to trigger a triggering mechanism and cause a breakdown of a number of gaps within a low voltage arc flash switch.

An apparatus may include a sensor housing, a light sensor disposed within the sensor housing, the light sensor arranged to generate a detection signal when light impinges on the light sensor, a sensor lens disposed at least partially outside the sensor housing, wherein a distal portion of the sensor lens extends a first distance above the sensor housing, the sensor lens being transparent, wherein light received from outside the sensor housing is transmitted to the light sensor; and a light emitter assembly disposed outside the sensor housing at a second distance above the housing less than the first distance.

An arc detection assembly is provided and includes first and second conductors including first and second terminal ends, respectively, which are engageable to form an electrical connection and a temperature sensing system. The temperature sensing system includes a temperature sensor disposed in contact with one of the first and second terminal ends and configured to sense a temperature of the one of the first and second terminal ends and a temperature monitoring circuit. The temperature monitoring circuit is coupled to the temperature sensor and configured to determine when the temperature sensor senses an increase in temperature of the one of the first and second terminal ends and to determine whether the increase in temperature is indicative of an arcing condition of the electrical connection.

An electronic control apparatus may include a printed circuit board on which electrical circuits are mounted, a power connector provided on the printed circuit board and electrically connected to an external power source, a power circuit configured to receive external power through the power connector and supply power to the electrical circuits, an ultraviolet sensor mounted on the printed circuit board, and configured to detect ultraviolet light and output an ultraviolet detected signal corresponding to the detection of the ultraviolet light, and a processor configured to block power supply to at least one part of the electrical circuits in response to the ultraviolet detected signal from the ultraviolet sensor.

A power cord photocoupler leakage current detection interrupter (LCDI) includes: a switch unit provided between an input terminal and an output terminal, and configured to control the input terminal and the output terminal to turn on or off; a leakage current detection line wrapped with a power cord connected between the switch unit and the output terminal, and configured to detect whether the power cord has a leakage current; and a leakage current interruption unit connected to the switch unit and the leakage current detection line, and configured to detect a leakage current signal of the leakage current detection line, and send a corresponding control signal to the switch unit according to the leakage current signal.

An art fault mitigator includes a sensor structured to detect at least one of a user within vicinity of the power system protection device, a light within the power system protection device and an overcurrent within the power system protection device; a mechanical switching device including a fast mechanical circuit interrupter and an actuator; a power electronics circuit coupled to the mechanical switching device in parallel and including a current commutator structured to commutate current from the fast mechanical circuit interrupter to the power electronics circuit upon turning OFF of the fast mechanical circuit interrupter, a power electronic circuit interrupter structured to allow the current to ride there-through up to a threshold current, and a current limiter structured to limit the current flowing through the power electronics circuit interrupter; and a controller including a trip control structured to control operations of the mechanical switching device and the power electronics circuit.

A device may include an acoustic sensor configured to detect one or more acoustic signals indicative of an arc fault. The device may include a timer configured to record a duration of the one or more acoustic signals detected by the acoustic sensor and a wireless communication interface configured to transmit an alarm signal when a threshold time has been exceeded. The device may communicate with a sensor hub configured to receive the alarm signal from the sensor device wireless communication interface over a local area connection, and in response to receiving the alarm signal transmit a notification.

A method for compensating for ambient light for an arc flash detection system for an electrical equipment, the arc flash detection system including a first optical sensor for detecting an arc flash, the method comprising initiating a recording mode in which a first output signal of the first optical sensor is recorded, wherein recording the first output signal comprises storing a first plurality of values, wherein each value of the first plurality of values is representative of a level of ambient light condition in or around the electrical equipment; terminating the recording mode after a recording time period; determining, based on the first plurality of values, a first quantity characterizing ambient light in or around the electrical equipment; and configuring the arc flash detection system to compensate for ambient light based on the first quantity.