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| Number | Title | Issue Date |
| 8183869 | Circuit interrupter with continuous self-testing feature A circuit interrupter includes a current transformer, phase conductor and neutral conductor. The phase conductor and the neutral conductor are each configured to pass through the transformer from line side to load side that are defined by the current transformer. Th... | 05/22/2012 |
| 8125228 | Protective device with automated self-test The present invention is directed to an electrical wiring device that includes at least one sensor that provides a sensor output signal corresponding to electrical perturbations propagating on the plurality of line terminals or the plurality of load terminals. A pro... | 02/28/2012 |
| 8089282 | Test assembly for a circuit breaker A test assembly for a circuit breaker with a single pole module having first and second conduction paths electrically isolated from each other via an interior wall of the module and a circuit board. The test assembly includes an axle at an upper portion of the inter... | 01/03/2012 |
| 7940051 | Method for testing circuit breakers A method for testing low voltage power circuit breakers having an electronic trip unit which includes a display and a microprocessor for controlling various protective functions and storing settings for such functions which can be selected and performed. Entering in... | 05/10/2011 |
| 7843197 | Protective device with end-of-life indication before power denial The present invention is directed to an electrical wiring device that includes an automatic self-test assembly coupled to the plurality of line terminals or the plurality of load terminals, the detection circuit, the fault detection circuit and the circuit interrupt... | 11/30/2010 |
| 7791346 | Device and method for testing an electrical power branch circuit A device and method for testing an electrical power branch circuit that includes hot, neutral and protective ground conductors and that carries alternating current. The device includes circuitry for determining the total available short-circuit current that can be c... | 09/07/2010 |
| 7755362 | Electric switching device An electric switchgear (10) with a pole of the switchgear filled with insulating gas is provided. A monitoring device (14) is provided for monitoring the insulating gas in the switchgear pole. A device (20) is provided that has a test connection... | 07/13/2010 |
| 7705601 | Method and apparatus for monitoring wellness of contactors and starters A system and method for monitoring the remaining useable life, or “wellness,” of a contactor or motor starter, and for predicting impending faults of such a device, is disclosed. By monitoring actuating coil current, actuating coil voltage, line current, and/or ... | 04/27/2010 |
| 7463036 | Measurement of analog coil voltage and coil current The measurement of analog coil voltage and coil current during the energizing of the circuit breaker coil that is connected to the output contact of a protective circuit breaker relay in order to detect an incipient failure of the circuit breaker mechanism. ... | 12/09/2008 |
| 7439744 | Automated arc generator and method to repeatably generate electrical arcs for AFCI testing An apparatus for repeatably generating electrical arcs for testing an electrical switching device, such as an arc fault circuit interrupter, includes a stationary electrode and a movable electrode that is moved along a path of travel by an electromechanical device u... | 10/21/2008 |
| 7436644 | Switching circuit, switching method, protective device and battery pack A solenoid type switch has at least two driving coils. The driving coils turn off a switch with a current for example an overcurrent that flows in the switch. The driving coils are magnetized or demagnetized by a driving circuit so as to turn on or off the switch. T... | 10/14/2008 |
| 7405569 | Monitoring system for high-voltage switches A method and an apparatus are disclosed for measuring contact erosion in an electrical switching device by a dynamic resistance measurement (DRM). To determine an overlap time and a contact erosion in an exemplary switching device, a change in current across the swi... | 07/29/2008 |
| 7403015 | System for wireless monitoring of circuit breakers A system for monitoring a circuit breaker that includes a monitoring device in electronic communication with the circuit breaker and a receiving device located separately from the monitoring device. The monitoring device receives data from the circuit breaker and wi... | 07/22/2008 |
| 7385406 | Automated electrical wiring inspection system The present invention is directed to an electrical wiring inspection system. The system includes an electrical measurement apparatus having at least one load center connector configured to couple the electrical measurement apparatus to a load center, at least one br... | 06/10/2008 |
| 7370106 | Network revision system with local system ports A revision system for a network having a plurality of data ports, pairs of the data ports being connectable by a patch cord to place the pairs of data ports into communication with each other, the revision system including a computer processor, a scanner in communic... | 05/06/2008 |
| 7341193 | Portable diagnostic device A portable, preferably hand-held device is provided which may be used to test device loops in fire safety systems for short circuits, open circuits, ground faults and can test the response of the devices in the loop before or after the device loop is connected to th... | 03/11/2008 |
| 7323881 | Process and apparatus for evaluating the degree of vacuum in closed bodies with transparent walls The invention is based on feeding the closed bodies to be evaluated to a station for the application of high voltage for the formation of the arc across the inner space of the body and capturing the arc formed by means of a CCD camera which will compare, adjustably,... | 01/29/2008 |
| 7317300 | Automotive battery state monitor apparatus A voltage control apparatus checks a battery voltage when an automotive generator gradually increases its output to be within a predetermined range after temporarily stopping the generator. Then, the battery voltage is picked up to calculate the charge rate. Further... | 01/08/2008 |
| 7304829 | Apparatus and method for filtering current sensor output signals An electronic filter for filtering the output signal of a current sensor of a circuit breaker is disclosed. The current sensor has an output signal characteristic similar to that of a Rogowski coil output signal characteristic that includes a third harmonic noise co... | 12/04/2007 |
| 7298598 | Wiring device with multi-shot miswire The present invention is directed to a protective wiring device that includes a plurality of line terminals coupled to a plurality of load terminals by way of at least one conductive path. A miswire detection circuit is coupled to the at least one conductive path. T... | 11/20/2007 |
| 7292043 | Electronically resettable current protection for die testing Electronically reset table test apparatus. The test apparatus includes an electronically operable current breaker connected to a test jig for testing semiconductor die. The electronically operable current breaker is connected through an interface that converts signa... | 11/06/2007 |
| 7279905 | Method and an apparatus for supervising the operation of current transformers A method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system includes determining a current ratio at an output of each group of cu... | 10/09/2007 |
| 7275965 | Testing tools for I/O ports A testing tool for testing an I/O port includes a cable and a testing card. The cable includes a port formed at one end thereof configured for being connected to the I/O port, and a first connector formed at an opposite end thereof. The testing card includes two tes... | 10/02/2007 |
| 7271577 | Testing loop impedance in an RCCB electrical test circuit A method and apparatus for testing the loop impedance in residual current circuit breaker (RCCB) protected circuits is provided. An alternating test current is applied across the phase earth connections of a supply and a plurality of voltage samples are then taken a... | 09/18/2007 |
| 7268558 | Circuit breaker tester including a pulse width modulation circuit A tester for testing a circuit breaker includes a plurality of load elements each having a nominal fixed impedance and an electronic switch associated with each load element. The electronic switch, when turned on, electrically connects a corresponding load element i... | 09/11/2007 |
| 7259565 | Testing an electrical switchgear system There is provided a method of testing an electrical switchgear system. A node in the electrical switchgear system monitors a power line signal and controls a breaker based on the power line signal. The method includes applying an analog signal to the node, and recei... | 08/21/2007 |
| 7253637 | Arc fault circuit interrupter system In order to determine whether arcing is present in an electrical circuit, a sensor signal corresponding to current in said electrical circuit is processed. The sensor signal is filtered to determine the presence of noise in a predetermined frequency range and produc... | 08/07/2007 |
| 7253630 | Electro-optical voltage sensor circuit monitoring leakage or loss of vacuum of a vacuum interrupter and vacuum circuit interrupter including the same A vacuum circuit breaker includes a line terminal, a load terminal and a vacuum interrupter having a vacuum envelope containing a fixed contact assembly and a moveable contact assembly moveable between closed and open circuit positions. The fixed contact assembly is... | 08/07/2007 |
| 7253629 | Circuit protection device with grounded neutral half cycle self test The present invention is directed to a circuit and method for self-testing a protection device for use in an AC power distribution system. The device is configured to be coupled between an AC power distribution system and at least one load. The method includes the s... | 08/07/2007 |
| 7248986 | Programmable system for device testing and control A programmable system for testing relays and controlling systems is provided. In one embodiment the present disclosure provides a programmable device capable of, for example, testing relays. The device includes a signal generator for generating signals to test relay... | 07/24/2007 |
| 7227347 | Device and method for measuring a current A device and method for current measurement in a conductor and, in particular, a method to feed the devices of the invention in order to interpret the information provided. The method is based on the exploitation of discrete sampling of the information provided from... | 06/05/2007 |
| 7215519 | Ground and line fault interrupt controller/adapter An adapter module for detecting an electronic fault condition in an electronic circuit is disclosed wherein the adapter module may include electrical fault indicator circuitry. In general, the electrical fault indicator circuitry may include ground fault indicator c... | 05/08/2007 |
| 7209331 | Method and power feed for electrical inspections A device is provided for inspecting an installed electrical system including a power panel and branch circuits with respective circuit breakers. The device includes a power interface unit with a Ground Fault Circuit Interrupter (GFCI) for connection with the power p... | 04/24/2007 |
| 7199587 | Portable circuit interrupter tester and method A portable circuit interrupter shutoff testing device and method, including a high current switch controlled by a timing circuit that allows current to flow through the switch and a small series resistance (in order to trip the instantaneous-trip function of the int... | 04/03/2007 |
| 7187177 | Method of monitoring a power distribution unit A method of monitoring a power distribution unit (306) may include providing a power distribution unit frame (310), where the power distribution unit frame has a 2U form factor (312), and where the power distribution unit frame is coupled to mou... | 03/06/2007 |
| 7188275 | Method of verifying a monitoring and responsive infrastructure of a system A method of verifying a monitoring and responsive infrastructure of a system is provided and described. The method includes setting a sensor to a simulation mode. Further, a test value is provided to simulate a real value outputted by the sensor. While in the simula... | 03/06/2007 |
| 7187160 | Systems and methods for measuring an RMS voltage An embodiment of a method for measuring an RMS voltage of an arbitrary time-varying waveform includes: a) coupling said arbitrary time-varying waveform to said thermally sensitive device; b) decoupling said arbitrary time-varying waveform from said thermally sensiti... | 03/06/2007 |
| 7180297 | Protective relay test device A test device for testing relays is provided. The test device includes a chassis and a plurality of generator components removably coupled to the chassis. Each of the plurality of generator components have a signal generator, a CPU to promote test signal generation ... | 02/20/2007 |
| 7173428 | Portable circuit interrupter shutoff testing device and method A portable circuit interrupter shutoff testing device and method, including a high current switch controlled by a timing circuit that allows current to flow through the switch and a small series resistance (in order to trip the instantaneous-trip function of the int... | 02/06/2007 |
| 7171317 | Load information display device and circuit breaker This invention is intended to reduce the cost by displaying the load information of a plurality of circuits with a single display device and transferring one of the two communication units in the measuring instruments from the measuring instruments to the display de... | 01/30/2007 |
