Fuse Or Circuit Breaker Patents (Class 340/638)
  • Patent number: 6172507
    Abstract: A circuit configuration for measuring resistance and/or leakage between two nodes, which includes a current source for feeding a test current into one of the two nodes and a circuit element that detects the voltage resulting between the two nodes. The output of a broadband signal generator is connected to a control input of the current source. The outputs of the circuit element and of the signal generator are connected to the inputs of the correlator for determining the correlation between their output signals.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: January 9, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventor: Stefan Hermann
  • Patent number: 6125692
    Abstract: A density sensor for monitoring a rate of leakage from the case of electrical switchgear filled with dielectric gas under pressure, the sensor comprising a fixing support mounted from the outside in the thickness of the case and communicating with the dielectric gas. A radiator is placed around the fixing support of the density sensor, thereby enabling a measurement artifact that is due to the exposure of the case and of the sensor to solar radiation to be transformed in such a manner that any risk of untimely crossing of a low density threshold is eliminated.
    Type: Grant
    Filed: October 22, 1998
    Date of Patent: October 3, 2000
    Assignee: GEC Alsthom T & D SA
    Inventor: Jean Marmonier
  • Patent number: 6121886
    Abstract: A method of predicting an eminent circuit breaker trip condition using an intelligent electronic device such as a trip unit, a protective relay, a power meter or other IED is presented. The intelligent electronic device includes a microcontroller and associated memories. An algorithm (program) stored in a memory of the intelligent electronic device generates a near-trip event for each trip event calculation if preset thresholds for the measured parameters are breached.
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: September 19, 2000
    Assignee: General Electric Company
    Inventor: Bo L. Andersen
  • Patent number: 6104302
    Abstract: A fuse protected power supply circuit for a sensor-operated solenoid controls plumbing fixtures such as automatically-operated faucets, automatically-operated flush valves, hand dryers, soap dispensers and the like. The circuit includes two automatically resettable fuses, one to protect the power supply circuit if the AC-operated solenoid should short and a second to protect the power supply circuit in the event that the sensor which detects the presence of a user of the plumbing device should short. The automatically resettable fuses provide a simple and reliable troubleshooting method in that replacement of either the sensor or the solenoid, depending upon whether one or both are in a shorted condition, allows the circuit to return to normal operation. Such troubleshooting may be undertaken by a maintenance person without the need of sophisticated electronic meters or similar troubleshooting devices.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: August 15, 2000
    Assignee: Sloan Valve Company
    Inventor: Nhon T. Vuong
  • Patent number: 6100808
    Abstract: A socket has a hollow base casing, and an upper casing engaging with the hollow base casing. The upper casing has an oblong hole and a pair of slots. The hollow base casing receives a first conductive blade, a second conductive blade, a fixed plate, and a metal bar. A breaker device is disposed between the upper casing and the hollow base casing. A metal bar contacts the first conductive blade. The metal bar will be bent while a current is overloading. Then the metal bar will not contact the first conductive blade. A break display lamp and a resistor are disposed in the upper casing. The break display lamp is connected to the resistor.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: August 8, 2000
    Inventor: Wen-Jang Lin
  • Patent number: 6067023
    Abstract: An apparatus and method for distributing power includes a housing, at least one input terminal, and at least one output terminal. The input and output terminals are each positioned in the housing. The input terminal is operatively connected to the output terminal. At least one circuit breaker is positioned in the housing. The circuit breaker includes an on position and an off position. The circuit breaker is operatively connected to the input terminal and the output terminal. An alarm circuit is operatively connected to the output terminal to prevent an alarm signal when an electronic chassis is not operatively connected to the output terminal and the circuit breaker is in the off position.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: May 23, 2000
    Assignee: 3COM Corporation
    Inventor: Laura M. Bendikas
  • Patent number: 6054931
    Abstract: The present invention relates to an electronic system incorporated into a circuit interrupter device to identify the circuit interrupter device associated with a particular power outlet receptacle.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: April 25, 2000
    Assignee: NTC, Inc.
    Inventor: Joachim Wottrich
  • Patent number: 6052265
    Abstract: An intelligent ground fault circuit interrupter device that incorporates a test and miswiring control circuit in addition to an independent GFCI circuit. Since the test and miswiring circuit is separate and independent of the GFCI circuit portion, it can be used with any circuit interrupting means that can be reset and which incorporates a test circuit. The test and miswiring circuit functions to indicate to a user when the device must be manually tested. The test time events occur upon first installation and on a monthly basis thereafter. The device also indicates that testing is required after occasions of power outage of sufficient time duration and after the device has been tripped by the occurrence of a ground fault. At the times when manual testing of the device is required, a visual and/or audible alarm is triggered and continues until a successful test and reset sequence is completed. The ability to detect when the device is incorrectly wired in an electrical wiring system is also provided.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: April 18, 2000
    Assignee: Leviton Manufacturing Co., Inc.
    Inventors: Albert Zaretsky, Roger M. Bradley
  • Patent number: 6052059
    Abstract: A fuse plug, in particular for terminal blocks in control, regulation and power supply systems, essentially comprising a housing, a fuse-element which is fused upon overshooting of a specific current intensity, contact elements and a display element. Reliable protection against surge voltages is provided. The device ensures that production can be automated with low costs by virtue of the housing (1) being formed from two flat holding halves (2, 3) that can be folded by means of a film hinge 4. The division of the housing is provided in the plane of the plug contacts (5, 6). The fuse-element (7), plug contacts (5, 6) and a display device (19) with a signalling element (15) are arranged in one holding half (2) of the housing (1).
    Type: Grant
    Filed: May 22, 1998
    Date of Patent: April 18, 2000
    Assignee: Krone GmbH
    Inventor: Jim Alfred Jaeger
  • Patent number: 6020811
    Abstract: A multiplexing apparatus multiplexes between processing units and a battery unit of a vehicle which are connected to one another by wire harnesses, by grouping a variety of on-board controlled objects into a plurality of neighboring controlled objects and controlling each of respective processing units. The wire harness has electric conductors of which the outer peripheral portion are covered with a first insulating layer, an electric conductivity layer which covers the electric conductors, a second insulating the peripheral portion of the electric layer which covers conductivity layer, a circuit for applying an electric potential to the electric conductivity layer, and a monitor for the electric potential of the electric conductivity layer.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: February 1, 2000
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Hiroyuki Saito, Mitsuru Koni
  • Patent number: 6011480
    Abstract: The system for determining protection quality of a protective relay and related functions of the protection system include obtaining information concerning the output status of the various protective elements in the relay. The status of various operations in the protective element are also evaluated against specific standards. The operation of supervisory and control elements affecting the action protective elements are also evaluated. Other aspects of the relay, including the availability of the relay and the operation of the voltage and current transformers are also evaluated. In addition, associated aspects such as the status of the communication channels, the station voltage availability and the condition of the trip and close circuits are monitored. All of the above is analyzed in a summary report to provide an indication of protection quality for the relay and associated protection system functions.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: January 4, 2000
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Jeffrey B. Roberts
  • Patent number: 5986557
    Abstract: There is disclosed a multi-phase fuse status indicator having a green "good" and a red "bad" indicator LED for each line fuse of the respective phases, the current to the LED's being pulsed to cause them to provide a blinking indication. Power used for the logic circuit for the LED's and the LED's themselves and the related heat dissipation is less than 10 watts and is supplied from the power lines connected through the fuses regardless of the fuses' condition. Only two simple conductor connections are required from the fuse status indicator to each fused line of the multi-phase power system.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: November 16, 1999
    Assignee: Automatic Timing & Controls, Inc.
    Inventor: Roger S. Clarke
  • Patent number: 5986558
    Abstract: Provided is a modular precharge circuit capable of rapidly recharging an equipment circuit path prior to insertion of a modular fuse or modular circuit breaker. The precharge circuit includes a switch to begin the operation of precharging, and a charge indicator to indicate appropriate charging has occurred. Charging occurs through use of a resistive network which receives an inrush current due to capacitance in the equipment circuit path. Once an equipment circuit path has been precharged to a desired level, a charge indicator signifies such charging is complete and the precharged unit is removed whereafter an appropriate fuse module and/or circuit breaker module is inserted. The precharge circuit further includes a fusing element and an alarm indicator wherein when the circuit enters a fault state such that the fuse is open, the alarm indicator signifies such a situation.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: November 16, 1999
    Assignee: Marconi Communications, Inc.
    Inventors: William A. Crawford, David J. Michlovic
  • Patent number: 5969625
    Abstract: The method and the apparatus for detecting a deteriorating condition in a bank of standby batteries includes injecting an audio frequency current into one of the battery buses or cables, detecting an audio frequency current signal, matched to the injected audio frequency current signal, that is carried by the battery bus and detecting a voltage drop, at the audio frequency, across the bank of standby batteries. In one embodiment, current transformers are utilized in connection with an oscillator (to inject the AF current signal) and detection circuits (comparators and operational amplifiers) are utilized to generate a representative current signal and a representative voltage signal. The device detects when the standby batteries are operating in a normal, stable condition, that is, when the bank is neither being recharged nor is discharging DC power to the load.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: October 19, 1999
    Inventor: Frank J. Russo
  • Patent number: 5959537
    Abstract: In a power distribution system, a reliable, accurate, and energy efficient fault circuit indicator is provided through a microcomputer-based fault current indicator design. First, reliability is improved inherently because the microcomputer, and the software embedded therein, replace the functionality of numerous discrete, less reliable electronic components found in prior designs. Second, the embedded software is capable of placing the fault current indicator in one of a number of energy conservation states, without compromising the fault current indicator's ability to provide information relating to the occurrence of a fault. Finally, greater fault current indication accuracy is achieved by detecting excessive line current, followed by a significant drop in line voltage.
    Type: Grant
    Filed: July 9, 1998
    Date of Patent: September 28, 1999
    Assignee: McGraw-Edison Company
    Inventors: John Frederick Banting, Frank John Muench, Eugene Scott Knabe
  • Patent number: 5955956
    Abstract: The audible alarm system of the present invention incorporates an alarm condition indicator that is designed to detect an alarm condition within the AED. The audible alarm system further incorporates an audible alarm circuit that is connected to the alarm condition indicator and is designed to produce an audible alarm. The audible alarm circuit is initially activated by the alarm condition indicator and then operates independently of the alarm condition after the initial activation.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: September 21, 1999
    Assignee: SurVivaLink Corporation
    Inventors: Gary B. Stendahl, Michael D. Welsch
  • Patent number: 5939991
    Abstract: A circuit breaker has line and load terminals and a mechanism which indicates the magnitude of current flowing through the circuit breaker. The mechanism includes a current sensing resistor coupled between the supply and load terminals. An amplifier is coupled to the current sensing resistor and produces a first output signal corresponding to the current magnitude. A first light emitting diode is energized by the first output signal. A first comparator is coupled to the amplifier and produces illumination of a second light emitting diode when the first output signal exceeds a first reference voltage level. A third light emitting diode is illuminated by a second comparator when the first output signal exceeds a second reference voltage level. Thus the number of light emitting diodes that are illuminated indicates the relative level of current conducted by the circuit breaker.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: August 17, 1999
    Assignee: Eaton Corporation
    Inventor: Kan Deng
  • Patent number: 5936535
    Abstract: An air circuit breaker bell alarm accessory interacts with the circuit breaker operating mechanism to provide local target indication as well as remote signal indication of the separation of the circuit breaker contacts. An indicator switch provides remote signal indication while a lock-out switch interacts with the accessory target to prevent re-closure of the circuit breaker contacts. One of the switches is selected having "normally open" contacts while the other switch is selected having "normally closed" contacts to reduce the amount of mechanical force required to simultaneously operate the indicator and lock-out switches.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: August 10, 1999
    Assignee: General Electric Company
    Inventors: James L. Rosen, Dean A. Robarge
  • Patent number: 5926355
    Abstract: A circuit breaker includes separable contacts for movement between a closed position and an open position. An operating mechanism moves the separable contacts between the closed and open positions and has a closed state and an open or tripped state which corresponds to the open position. A trip circuit senses electrical current flowing through the separable contacts, employs the sensed current to trip the operating mechanism to the tripped state to move the separable contacts to the open position, and provides plural status signals. A display circuit cooperates with the trip circuit and includes light emitting diodes for outputting the status signals. A battery powers the display circuit which further includes an oscillator circuit for modulating the LEDs to reduce power from the battery to the display circuit.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: July 20, 1999
    Assignee: Eaton Corporation
    Inventors: Joseph J. Matsko, Richard A. Johnson, John A. Massoud
  • Patent number: 5923261
    Abstract: An air circuit breaker bell alarm accessory interacts with the circuit breaker contact position indicator to provide local and remote indication of the occurrence of a circuit interruption. A drive pin extending from the bottom of the accessory interacts with a slot on the contact position indicator lever to reset the bell alarm accessory when the circuit breaker contacts are in the process of being closed.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: July 13, 1999
    Assignee: General Electric Company
    Inventors: Roger N. Castonguay, Dean A. Robarge
  • Patent number: 5914663
    Abstract: The apparatus detects subsidence current from unfiltered as well as filtered secondary current values in the current transformer. A lack of zero crossings during a predetermined period is a reliable indication of the presence of subsidence current. If subsidence current is detected, then a signal is generated which indicates that the circuit breaker for the power system has opened, providing an accelerated indication thereof relative to an indication produced by an overcurrent element dropping out.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: June 22, 1999
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: David E. Whitehead
  • Patent number: 5909180
    Abstract: For use within an electrical distribution to control current paths through a plurality of associated circuit breakers, a circuit arrangement comprises a plurality of circuit breakers, each having a status related to open contact position and a closed contact position. An informational display is included within the load-center to display the plurality of statuses at a user access side of the display, and a control circuit, coupled to the circuit breakers and the informational display, automatically monitors the contact status of the circuit breakers and drives the informational display so that a display of the statuses is provided.
    Type: Grant
    Filed: June 28, 1991
    Date of Patent: June 1, 1999
    Assignee: Square D Company
    Inventors: Curtis J. Bailey, Ronald J. Bilas, Ronald L. Farrington, Dennis W. Fleege, Drew A. Reid
  • Patent number: 5907267
    Abstract: Photoelectric reflective object sensors are mounted in an exteriorly mounted auxiliary switch case to detect a member on a movable contact assembly of the contactor to produce logic level output signals indicative of the operational state of the contactor electromagnet. One or a pair of photoelectric sensors are used in a side mounted auxiliary switch to detect the contactor movable contact assembly in the energized or de-energized position, or en route between the two positions. A single photoelectric sensor is used in a top adder auxiliary switch to detect if the movable contact assembly is or is not in the extended (de-energized) position. The auxiliary switches provided logic level output signals directly usable with microprocessor based controllers.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: May 25, 1999
    Assignee: Eaton Corporation
    Inventors: Scott A. Reid, Francis S. Richards, Jr.
  • Patent number: 5892449
    Abstract: An electrical distribution system having a load center for programmably and remotely controlling a plurality of circuit breakers, an expander unit coupled to the load center and a plurality of external switches for providing signals to the load center representative of the status of the switches. The load center contains a control module that continually receives inputs from the expander unit via an interface module. It also contains a keyboard and display for programming instructions for closing and opening the individual circuit breakers and for displaying the status of the circuit breakers. The interface module, coupled to the control module, causes the circuit breakers to open and close according to programmed instructions received from the control module or another external device. The expander unit contains a plurality of input circuits coupled to external switches.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: April 6, 1999
    Assignee: Square D Company
    Inventors: Drew A. Reid, Kon Wong, Robert C. Ditmore, Fredric I. Graham
  • Patent number: 5886641
    Abstract: A circuit breaker with trip indicator assembly for indicating the trip status of the circuit breaker. The trip indicator assembly includes a spring powered shaft movable between a cocked position and a trip position in which the spring powered shaft protrudes through the housing of the circuit breaker to indicate the trip status. The shaft is operatively connected to a trip actuating mechanism of the circuit breaker so as to actuate the shaft in response to the trip actuating mechanism actuating an operating mechanism of the circuit breaker. A lost motion coupling is provided to assure that the trip indicator assembly is not actuated until after actuation of the operating mechanism. A bell alarm switch assembly for signalling the trip status of the circuit breaker may be operatively connected to the trip indicator assembly.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: March 23, 1999
    Assignee: Eaton Corporation
    Inventors: Phillip L. Ulerich, Gregory D. Tallman
  • Patent number: 5877691
    Abstract: The circuit breaker comprises a circuit breaker unit onto which there are fixed a communication module, a processing module and a calibration module. The communication module communicates with the processing module only via a connection with galvanic isolation, preferably an optical connection, whereas the calibration module is electrically connected to the processing module. The communication module is, in addition, connected by a mechanical connection to parts of the circuit breaker unit representative of the state of the circuit breaker, and by a bidirectional electrical connection to an external communication bus. An interface connected to the circuit breaker unit can act as support for the calibration module and for an additional module containing information representative of the breaking capacity of the circuit breaker and electrically connected to the processing module.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: March 2, 1999
    Assignee: Schneider Electric SA
    Inventors: Eric Suptitz, Henri Bellotto, Luc Weynachter, Patrice Allin
  • Patent number: 5859596
    Abstract: A plurality of monitoring devices are connected to respective pieces of switchyard equipment and associated with a common communications network. A remote host computer is connected to the network to bidirectionally communicate with each monitoring device. The communications network is the existing power line used for delivering power and control signals to the switchyard equipment. Each monitoring device includes testing and/or monitoring circuitry for testing and/or monitoring one or more conditions of the piece of switchyard equipment and generating condition data therefrom, a storage device for storing the generated data, and a transmitter adapted to transmit the data to the remote location via the power line. The remote host computer receives the data transmitted to the remote location and stores the received data therein in a database format. The monitoring device can request previously sent data from the remote host computer.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: January 12, 1999
    Assignee: CSI Technology, Inc.
    Inventor: David J. McRae
  • Patent number: 5844493
    Abstract: Switching devices can have means for contactless switching position detection. According to the invention, magnetic field sensors arranged at suitable locations inside and/or outside a device housing are provided for switching position detection. In particular, position-dependent magnetic fields are measured for ON/OFF position detection, overcurrent triggering, and contact welding; however, the magnetic field of the current flowing is detected to recognize short-circuit triggering. Differential Hall effect sensors and Reed contacts, respectively, can be used for these purposes. In addition, a sound sensor can be provided for detecting the switching noise, whose signal is evaluated together with the overcurrent triggering signal for short-circuit detection.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: December 1, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Fritz Pohl, Wilfried Jaehner
  • Patent number: 5841534
    Abstract: A device is disclosed for measuring light scatter by particles (3) suspended in a carrier medium with a view to ascertaining the density, size or size distribution of the particles. The device comprises: at least one light source (8) which directs light onto a light-scattering center (2) in the carrier medium with the suspended particles (3); a receiver (4) to pick up a portion of the scattered light from the light-scattering center; and an evaluating device connected downstream of the receiver (4). The invention provides for an elongated detection chamber bounded radially around its central axis by the wall of a housing (1) which also acts as a duct for the through-flowing carrier medium with the suspended particles (3). Each light source (8) is mounted on the wall of the housing (1) and points toward the central axis of the detection chamber.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: November 24, 1998
    Assignee: Gerhard Lorenz Innovative Technik + Messgeratebau
    Inventor: Gerhard Lorenz
  • Patent number: 5835324
    Abstract: A electronic fuse box is provided with an input device such as a keypad with alphanumeric and data entry keys, a central processing unit made from one or more integrated circuits that is communicatively coupled to said keypad as well as a power switch assembly and a metering assembly. Application is achieved by connecting a power source to the electronic fuse box at the power switch assembly. Also, a plurality of external circuits are electrically connected to the electronic fuse box at the metering assembly.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: November 10, 1998
    Inventor: Ken W. Hatton
  • Patent number: 5828540
    Abstract: The invention relates to a method of protecting against circuit breaker failure, said circuit breaker having contacts capable of moving between a closed position and an open position, and vice versa, and being fitted with protection apparatus including fault detector apparatus for putting into operation an opening electromagnetic coil that actuates circuit breaker contact drive apparatus, with position-indicator contacts of monitor apparatus being changed over as soon as the circuit breaker contacts start to move. According to the invention, in the event of a fault being detected, a time delay is generated from the indicator contacts changing over, and at the end of said time delay it is verified whether the fault current has become zero, and if not an alarm is generated.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: October 27, 1998
    Assignee: Gec Alsthom T & D SA
    Inventors: Jean Marmonier, Herve Lefort
  • Patent number: 5812352
    Abstract: Apparatus and method for opening circuit breakers in a circuit are disclosed. The apparatus includes input terminals adapted to be connected to the circuit, a switch and a load. When the apparatus is connected to the circuit and the switch is closed, a current is created in the circuit which overloads the circuit breaker. The apparatus also includes a fuse to protect the device and a LED to indicate when the device is in use. The apparatus can also include multiple loads to be able to create the overload in different circuits.
    Type: Grant
    Filed: June 26, 1996
    Date of Patent: September 22, 1998
    Assignee: Rokey Corporation
    Inventors: Stephen R. Rokita, John J. Davis
  • Patent number: 5805070
    Abstract: A system for registering a malfunction in telecommunications equipment comprises a protective device including a terminal connector pin and a ground pin connected to ground. The system also includes a housing member for housing the protective device, the housing member including a conductive member attached thereto. A main failsafe switch connects the terminal connector pin to ground through the ground pin in the event of an overvoltage, while an alarm switch connects the conductive member attached to the housing member to ground in the event of the overvoltage. An overvoltage sensitive member contacts both the main failsafe switch and the alarm switch, and retracts both the main failsafe switch and the alarm switch while in a normal operating state of the telecommunications equipment. The overvoltage sensitive member releases both switches in the event of the overvoltage.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: September 8, 1998
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Tomas S. Eriksson
  • Patent number: 5754113
    Abstract: A monitoring apparatus includes sensors for interconnection with the load output terminal of a corresponding circuit breaker. The sensors sense the closed and open states of the corresponding circuit breakers and produce closure signals at outputs. The sensor outputs are interconnected in series to produce a combined closure signal for all of the circuit breakers. An indicating circuit interconnected with the combined closure signal outputs a signal, such as a relay contact or an audible, visual, or digital signal, to indicate the combined closure status of the circuit breakers.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: May 19, 1998
    Assignee: Eaton Corporation
    Inventor: William S. Boyer
  • Patent number: 5739737
    Abstract: A fuse box is provided with LED's interconnected with all fuses carried by the fuse box for identifying a blown fuse. The LED's are interconnected with the fuses between the positive (current in) input and ground. When a fuse is blown, the fuse results in an open circuit and the flow of electricity is rerouted through the LED to illuminate the LED. Also provided is a liner which fits over an existing fuse box and includes receptacles for fuses with corresponding LEDs associated with each receptacle for indicating a blown fuse. Also provided are individual liners for individual fuses. The individual liner is sized and configured to accept a fuse therein on a first side, and to extend into a fuse box on a second side thereof. The individual liner includes a LED interconnected therewith for indicating a blown fuse. Also provided is a remote indicator having a plurality of indicators positioned away from a fuse box. Additionally provided is a remote fuse box.
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: April 14, 1998
    Inventor: Ken W. Hatton
  • Patent number: 5731760
    Abstract: A fuse protection and fuse blowing circuit includes a fuse register which has an additional fuse with respect to other fuse registers used in the system. The additional fuse has an output which indicates a blown/not blown state of the additional fuse, and that output is fed back to a blow enable input of each of the other fuses in the fuse register and the other fuse registers. When the additional fuse is set to the blown state, none of the other fuses are allowed to be blown, thereby protecting the device against any accidental blowing of fuses.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: March 24, 1998
    Assignee: Advanced Micro Devices Inc.
    Inventor: Sergio R. Ramirez
  • Patent number: 5714940
    Abstract: A bell alarm system is provided for a circuit breaker in which the actuation of a flux shift trip device causes an electrical switch to be energized thus providing a bell alarm indication that the circuit breaker has been tripped. The flux trip device impinges against a pivotally rotated lower lever mechanism which has a knee which causes rotation of an upper lever against the influence of a spring attached between the two levers. As the knee moves along a surface of the upper lever mechanism, the relative rotation of the two lever members about their support pins is such as to cause the tension on the spring to increase. Because of this vibration in the circuit breaker itself or minute low level movements of the plunger mechanism will not cause the bell alarm to be actuated.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: February 3, 1998
    Assignee: Eaton Corporation
    Inventors: Anthony J. Fishovitz, Thomas K. Fogle
  • Patent number: 5710513
    Abstract: A circuit breaker testing apparatus includes an electrical circuit, an adjustable inductor connected in the circuit and a transducer for sensing current flow in the circuit. The circuit has leads terminated by electrical connectors for connection to terminals of a circuit breaker for providing a source of electrical power to circuit from the circuit breaker. The inductor is adapted to produce an adjustable electrical load on the circuit breaker. The testing apparatus also includes an indicator connected to the transducer for producing a reading of the magnitude of current flow in the circuit and for displaying and holding the reading of the highest magnitude of current flow reached in the circuit and thereby the magnitude of current flow at which the circuit breaker is tripped by the adjustment of the electrical load on the circuit breaker.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: January 20, 1998
    Inventor: James M. March
  • Patent number: 5701118
    Abstract: The present invention is substantially an indicator cap which is removably attachable to a prior art plug-in type fuse, and the cap having an indicator light for signaling that a fuse has blown so as to notify a user of the blown condition of the fuse. Furthermore, we provide unique circuitry which in combination with the existing circuitry provides unusual results, and we also provide a method of use therefore.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: December 23, 1997
    Inventors: Harold L. Hull, Galen J. May, John J. May
  • Patent number: 5670936
    Abstract: A power controller (10) for supplying power to a power distribution network (N) in which power from a polyphase source (G) is routed to using equipment (E) connected to the network through the power controller. A plurality of solid-state power devices (82) switch each separate phase of the polyphase power to the equipment. A firing circuit (14) controls gating of the switches to route the power. Fuses (F) are connected between the switches and the using equipment to interrupt power flow to the equipment if excessive current begins to be drawn. A con, roller (20) controls a shutdown sequence employed by the controller to eliminate current spiking at shutdown. The various components are housed in an enclosure (22) which includes a mounting structure (56) for mounting the aforesaid components. A cooling system (26) employs a fan (88) for directing air flow through the mounting structure to cool the components.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: September 23, 1997
    Assignee: Emerson Electric Co.
    Inventors: Wayne S. Estes, Carl D. Russell
  • Patent number: 5657002
    Abstract: A resettable, latching indicator is described. The indicator has a pair of electrical terminals through which it connects to the circuitry whose state is being indicated. The device includes an electromagnetic coil with a first lead connected to a first terminal of the device and a second lead connected to a first contact within the device. A second contact within the device is connected to the second indicator terminal, completing the circuit within the device. In a preferred embodiment, the device is arranged as a fuse state indicator with the device terminals connected in parallel with a fuse. Before fuse blow, an internal electrical contact is formed as the first and second contacts are closed an abutment formed on a spring-biased indicator flag. When the fuse blows, current passes through the coil, thus creating a magnetic field. The field moves a spring-biased armature having a catch which normally retains the indicator flag in a non-indicating position.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: August 12, 1997
    Assignee: Electrodynamics, Inc.
    Inventor: Gerald W. Ogden
  • Patent number: 5623254
    Abstract: A drive circuit fault detection device comprising a discriminating circuit generating a digital signal, the level of which indicates a fault; and an identifying circuit generating a binary-coded signal indicating the type of fault, i.e. ground shorting of the drive circuit or an open load. The discriminating circuit comprises a resistive network connected to the output of the drive circuit, for generating a voltage indicating correct connection of the load or a fault on the drive circuit and a comparator for comparing the generated voltage with a reference voltage and supplying the digital signal at its output. The identifying circuit comprises a current mirror circuit generating an output voltage having two different logic levels in the event of short circuiting or an open load, respectively, and a combination circuit for generating the binary-coded output signal.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: April 22, 1997
    Assignee: SGS-Thomson Microelectronics S.r.l.
    Inventors: Massimiliano Brambilla, Giampietro Maggioni
  • Patent number: 5614888
    Abstract: A circuit configuration for a signalling device in circuit breaker units, in particular in power circuit breakers, which have an electronic tripping device and which become effective in the event of a fault in an electrical system to be protected, whereby the electronic tripping device includes a microcontroller which performs a fault evaluation, and for each type of fault makes available an output pin, from which the corresponding fault signal is amplified and transmitted to an electrical relay. The fault signal (FM, FM1 . . . FMn) is transmitted to the circuit configuration (SA, SA1 . . . SAn), and by means of logic operation with the action of a static standard signal and of a clock pulse signal (Clock Pulse) acts on the electrical relay, which is realized in the form of a bistable relay (RB, RB1 . . . RBn) the contact system of which corresponds to a make function or a break function, depending on the signal status of the standard signal.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: March 25, 1997
    Assignee: Klockner-Moeller GmbH
    Inventors: Oliver Borchmann, Thomas Bungartz
  • Patent number: 5604437
    Abstract: A device for measuring circuit breaker wear by integrating the square of the current to be interrupted, said circuit breaker including a control that is actuated by a trip coil. The device includes a timing delay circuit that is actuated by a signal corresponding to a change in the driven or non-drive state of the trip coil, the timing delay circuit causing integration to begin after time has elapsed that is equal to the mechanical delay of the circuit breaker, which mechanical delay is a previously-measured data item. The device further includes a circuit that delivers a signal proportional to the current carried by the circuit breaker, a circuit that squares the signal, and that applies said square to the integrator, said integration being performed for a given length of time that is longer than the maximum arcing time of the circuit breaker, which maximum arcing time is likewise a previously measured data item, the result of the integration being applied to a summing circuit.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: February 18, 1997
    Assignee: Gec Alsthom T & D SA
    Inventors: Jean-Paul Moncorge, Lionel Lucot
  • Patent number: 5602532
    Abstract: An electrically powered annunciating system, for use in electrical panel boxes, having a sensing circuit including a first acoustical transducer to transmit a sonic signal to an annunciating circuit having a second acoustical transducer at a spaced distance from the first transducer to operate the annunciating circuit responsive to a sonic signal received from the first transducer. The sensing circuit powers the first acoustical transducer to produce a sonic signal responsive to a sensed electrical event such as termination of power to an electrical component. The annunciating circuit includes a tuned amplifier for signal purification and amplification, a time delay integrator to prevent accidental circuit operation caused by noise and an annunciator and a communication interface activated responsive to a sonic signal received by the second transducer.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: February 11, 1997
    Assignee: A.C. Data Systems of Idaho, Inc.
    Inventor: Barry D. Ryan
  • Patent number: 5581218
    Abstract: A circuit breaker 10 includes a housing and an operating mechanism 12 contained within the housing. An indicating arrangement is carried by the operating mechanism 12 and is displaceable relative to the housing under the action of the operating mechanism 12 for indicating the status of the operating mechanism 12.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: December 3, 1996
    Assignee: Circuit Breaker Industries Ltd.
    Inventors: Dante Bagalini, Alan G. Sugden, Danny Hadary
  • Patent number: 5561580
    Abstract: There is provided a microcontroller for controlling the activation of a hopper, bowl feeder, and linear feeder. There is further provided a blown fuse circuit which indicates that a fuse has blown for the various components of the part feeder system as well as preventing machines at the load from being powered should the fuse blow.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: October 1, 1996
    Assignee: FMC Corporation
    Inventors: David G. Pounds, Randy K. Baird
  • Patent number: 5555456
    Abstract: A fault control apparatus is disclosed having elements that provide for an easily reconfigurable fault response. When the fault detection circuit signals that a fault has occurred, an alarm is triggered, switching means are automatically set to their fault positions, and a control output circuit is activated. The flexibility of fault response is made possible by the use of a matrix of switched connections to preset the fault positions of the relays. Additional flexibility is provided by providing an adjustable level for the control output.
    Type: Grant
    Filed: August 2, 1994
    Date of Patent: September 10, 1996
    Assignee: ITT Corporation
    Inventor: Eugene L. Waite
  • Patent number: 5546266
    Abstract: In a circuit interrupter which has multiple electronic trip circuits, such as ground fault and arcing fault trip circuits, indicators such as LED's produce an indication of the cause of the trip. The trip signals are latched to provide a continuing trip indication and ORed to actuate the trip device. In one embodiment SCR's connected in series with the indicator LED's serve as the latches and are connected in parallel to the trip device to provide the OR function. In other embodiments, flip-flops serve as the latches. In one such embodiment, the indicator LED's are connected from the respective flip-flops in parallel to the trip device to provide the OR function. In another such embodiment the flip-flops actuate the trip device and turn on switches actuating the LED's These switches energizing the cause of trip LED's are disabled until the contacts open to assure operation of the trip device.
    Type: Grant
    Filed: June 24, 1994
    Date of Patent: August 13, 1996
    Assignee: Eaton Corporation
    Inventors: Raymond W. Mackenzie, John A. Wafer
  • Patent number: RE36317
    Abstract: An indicating fuse assembly includes an electrically non-conductive housing; an array of first and second electrically conductive contacts supported by the housing, each pair of first and second contacts being adapted for connecting a replaceable fuse, the contacts being connected in a powered circuit wherein each fuse, when connected between a respective pair of the contacts, is electrically series-connected with a load of the circuit; and a plurality of illuminators electrically connected within the housing for displaying open circuit conditions of corresponding ones of the fuses when the contacts are connected in the powered circuit, electrical current in the illuminators being limited to a minor fraction of a rated current of the corresponding loads. At least some the illuminators can include bipolar pairs of light emitting diodes for activation of the respective illuminators without regard to polarity of the circuit.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: September 28, 1999
    Inventor: Jose F. Arratia