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Class Information
Number: 361/44
Name: Electricity: electrical systems and devices > Safety and protection of systems and devices > Ground fault protection > With differential sensing in a polyphase system
Description: Subject matter wherein the current going to and returning from the load in a polyphase system is compared by a sensing means and a sensed difference activates the protective circuit.

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8710850 System and method for detecting an earth ground fault of an external power supply connected to a vehicle Apr. 29, 2014
8614867 Power supply for an electronic tripping unit for a switch, in particular a circuit breaker for low voltages, and a switch having a power supply such as this Dec. 24, 2013
8614869 Apparatus, method, and system for integrating ground fault circuit interrupters in equipment-grounded high voltage systems Dec. 24, 2013
8605395 Dual plug adapter and household high current apparatus Dec. 10, 2013
8537510 Method and apparatus for monitoring the isolation of an IT-Grid Sep. 17, 2013
8537509 Ground fault detecting and controlling method for parallel-structured high voltage system Sep. 17, 2013
8537021 Apparatus, method, and system for improved control and monitoring of electrical systems Sep. 17, 2013
8531803 Lightning protection for power inverters Sep. 10, 2013
8493697 Arrangement for ground-fault detection in an AC circuit and power supply arrangement with ground-fault detection Jul. 23, 2013
8477466 Protective device with separate end-of-life trip mechanism Jul. 2, 2013
8472154 Systems, methods, and apparatus for leakage current masking and ground fault detection Jun. 25, 2013
8451568 Remotely-controllable circuit breaker May. 28, 2013
8446699 Residual current device having voltage dependent and voltage independent modes of operation May. 21, 2013
8437108 Protective device with separate end-of-life trip mechanism May. 7, 2013
8427794 Multi-pole arc-fault circuit interrupter Apr. 23, 2013
8412966 Voltage sensing circuitry for solid state power controllers Apr. 2, 2013
8335063 Redundant systems, methods, and apparatus for use in arc flash prevention systems Dec. 18, 2012
8331067 Method and apparatus for moving material Dec. 11, 2012
8320089 Apparatus, method, and system for integrating ground fault circuit interrupters in equipment-grounded high voltage systems Nov. 27, 2012
8320090 SSPC for parallel arc fault detection in DC power system Nov. 27, 2012
8315023 Residual-current circuit breaker Nov. 20, 2012
8311785 Methods and apparatus to minimize saturation in a ground fault detection device Nov. 13, 2012
8300369 System and method for polyphase ground-fault circuit-interrupters Oct. 30, 2012
8289668 Charging current compensation for line current differential protection Oct. 16, 2012
8280670 Method and apparatus for detecting failure of an actuator switching device Oct. 2, 2012
8259423 Automotive vehicle charge port with fault interrupt circuit Sep. 4, 2012
8238066 Current sensor for earth leakage module Aug. 7, 2012
8218274 Direct current arc fault circuit interrupter, direct current arc fault detector, noise blanking circuit for a direct current arc fault circuit interrupter, and method of detecting arc faults Jul. 10, 2012
8213139 Leakage current protection plug and interrupt protection plug contact spring structure Jul. 3, 2012
8189306 Dynamic grounding system and method May. 29, 2012
8189307 Composite type electric circuit breaker and method thereof May. 29, 2012
8174805 Residual current device May. 8, 2012
8174804 Circuit breakers with ground fault and overcurrent trip May. 8, 2012
8149550 Protective device having a circuit breaker, in particular a low-voltage circuit breaker Apr. 3, 2012
8139328 Fault circuit interrupting device with symmetrical inputs Mar. 20, 2012
8134812 Energy conversion system with fault detection and interruption Mar. 13, 2012
8072717 Protective device with separate end-of-life trip mechanism Dec. 6, 2011
8068318 Apparatus for ground fault current interrupter with overall end-of-life indication and shutdown protection function Nov. 29, 2011
8064174 Leakage current detection and interruption circuit with improved shield Nov. 22, 2011
8054594 ARC flash detection system Nov. 8, 2011
8045303 Building service ground fault interrupter Oct. 25, 2011
8023236 Precision ground fault detection for aircraft human body protection Sep. 20, 2011
8018697 Ground fault protection circuit Sep. 13, 2011
8009394 Leak current breaker and method Aug. 30, 2011
8004804 Circuit interrupter having at least one indicator Aug. 23, 2011
7995315 Ground fault protection circuit for multi-source electrical distribution system Aug. 9, 2011
7969696 Ground fault detection and localization in an ungrounded or floating DC electrical system Jun. 28, 2011
7948722 Differential protection device May. 24, 2011
7948723 Method and apparatus for measuring DC current in an AC generator May. 24, 2011
7944654 Multiple-pole circuit breaker with shared current sensor for arcing fault detection May. 17, 2011

1 2 3 4 5

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