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7593197 |
Electric circuit
An electric circuit in which a combined resistance including a plurality of resistors of a small rating is disposed. The electric circuit includes a bypass section in order to allow a short-circuit...
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7542250 |
Micro-electromechanical system based electric motor starter
A motor starter is provided. The motor starter includes micro-electromechanical system switching circuitry. The system may further include solid state switching circuitry coupled in a parallel...
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7538990 |
High voltage DC contactor hybrid without a DC arc break
An apparatus, and a method of opening and closing electrical power feed lines using a hybrid contactor, which combines a traditional set of mechanical main contacts with a high voltage solid state...
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7505236 |
Arc suppression circuit
A contactor arc suppression system for an electric propulsion vehicle having an on-board diesel-electric power generating system for supplying electric power to a plurality of DC electric traction...
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7433229 |
Flash memory device with shunt
A shunt activation signal is transmitted by an external control terminal through an external transmission interface to switch a flash memory controller in a shunt mode. The shunt activation signal...
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7405544 |
Voltage regulating circuit for uninterruptible power supply
A voltage regulating circuit has a first switch, a transformer and a second switch. The first switch has an input node, a first node and a second node. The transformer is connected to the switches...
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7391133 |
Hybrid switch
An electrical switching topology for a hybrid switch provides extremely low losses in both cryogenic and non-cryogenic electronic systems. In this switch having switch modules connected in...
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7352544 |
Method and apparatus for providing a remedial strategy for an electrical circuit
A method and electrical circuit for dynamic reconfiguration of a DC-to-AC inverter comprising first and second power rails where each the rails has a power source. The method comprises monitoring...
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7149063 |
Apparatus, methods and articles of manufacture to minimize arcing in electrical connectors
An electrical connector and methods for minimizing arcing when the connector is connected or disconnected under load are disclosed. The invention provides an arc reduction circuit with one or more...
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7145758 |
Arc suppression circuit for electrical contacts
A circuit to suppress arc across contacts of a relay is provided, in which the relay is electrically coupled to a power supply and a load. The circuit includes an arc suppression circuit...
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7079363 |
Hybrid DC electromagnetic contactor
In a hybrid DC electromagnetic contactor, by including a power unit for supplying a certain power voltage; a main contact point of a breaking switch for providing a supply path of the power voltage...
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6992466 |
Waveform control system
An apparatus for the improvement of AC waveform comprising means for applying a demand input waveform at an input of a circuit for power conditioning (including an inverter PWMVC or BBHCC) that is...
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6741435 |
Power controller with DC ARC-supression relays
A DC arc-suppressor for network appliance power managers comprises an electromechanical relay that controls the flow of battery power to a network appliance by remote control. The relay includes...
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6674619 |
Method for interrupting an electrical circuit
A method for interrupting current is provided wherein substantially all current is conveyed through a normal current carrying path in a circuit interrupter. A movable element is displaced for...
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6671142 |
Circuit for operating voltage range extension for a relay
A relay is designed to be used in a circuit where the voltage levels are high in comparison to the spacing between the contacts when open. Contact closure arcing is suppressed by actuating a MOSFET...
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6667863 |
Method and apparatus for interrupting current through deionization of arc plasma
A technique is provided for enhancing performance of a circuit interrupter by deionizing arc plasma developed during an interruption event. A source material is disposed in a secondary current...
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6665157 |
Apparatus for interrupting an electrical circuit
An electrical circuit interrupter includes a primary or normal current carrying path and a transient or alternative current carrying path. The normal current carrying path is established by a...
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6661628 |
Method for interrupting a current-carrying path
A method for interrupting current is provided wherein substantially all current is conveyed through a first current carrying path in a circuit interrupter. A movable element is displaced for...
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6643112 |
Semiconductor switch-assisted electromechanical relay
An electromechanical relay including a mechanical displacement electrical contact and a transistor parallel-connected with the electrical contact. The contact is closed for a voltage V...
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6631058 |
Method and apparatus for reducing arc retrogression in a circuit interrupter
A technique for reducing arc retrogression in a circuit interrupter includes providing a source material in a parallel current carrying path in the interrupter. The source material and parallel...
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6621668 |
Relay circuit means for controlling the application of AC power to a load using a relay with arc suppression circuitry
A solid state arc suppression circuitry is defined for placement in parallel extending over the mechanical contacts of a conventional coil and contact mechanical relay mechanism for the purpose of...
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6594126 |
Method and apparatus for extinguishing an arc through material surface ablation
A technique is provided for forcing greater voltage investment in an arc developed during interruption of a current carrying path. A source element is provided in a secondary current carrying path...
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6548769 |
Circuit breaker
A circuit breaker includes an opening and closing mechanism section with an opening and closing lever, and an alarm-outputting plate operating in response to a tripping operation. A case for the...
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6535366 |
High-speed current-limiting switch
The current-limiting switch (S) has an arc-resistant contact arrangement (K 1 ), which is intended to carry the rated current (I N ), of a first switching point (S 1 ), and two commutation paths (P...
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6347024 |
Hybrid power relay
Hybrid power relay used for opening or closing electrical circuits, including an electrical contact having a mechanical movement, a semiconductor component in parallel with the electrical contact,...
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6215632 |
Switching device
A switching device including a movable contact member. The movable contact member produces an isolating distance and includes an integral semiconductor switching element.
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6128168 |
Circuit breaker with improved arc interruption function
A fault current interrupter is provided by the parallel combination of a polymer current limiter and a voltage dependent resistor connected across a pair of separable contacts to permit the...
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6072673 |
Medium to high voltage load circuit interrupters including metal resistors having a positive temperature coefficient of resistivity (PTC elements)
A medium to high voltage load circuit interrupter and method for breaking the flow of electric current in a line having a load and a source. A main switch is connected in series with the line. A...
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6064001 |
High current electrical switching apparatus with poles interleaved and modules joined by interference fit of joining block in undercut grooves in molded casings
Two molded case electrical switches such as circuit breakers, network protectors, disconnect switches and transfer switches, are secured together side-by-side by joining blocks having tongues...
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6046899 |
Hybrid protective relay having enhanced contact response time
A protective relay of the type consisting of a relay contacts controlled by means of a relay coil further includes a pair of triacs controlled by an optical switch. The high speed response is...
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6011678 |
Electrical device with double AC breaking contacts
The device includes two breaking areas formed at each side of a contact bridge carrying main contacts that can be separated from fixed contacts located in the breaking areas and fixed to main...
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5990723 |
Filter circuits for protecting against transient electrical pulses
The present invention teaches a variety of filter circuits for protecting against transient electrical pulses such as those caused by electrostatic discharge (ESD) events. One aspect of the present...
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5956222 |
Electronic switch for quick, automatic response to current overloads
An electronic switch circuit for controlling a main circuit including a power source and a load, the electronic switch circuit including (a) an electromagnetic relay device including an...
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5953189 |
Circuit for the protected power supply of an electrical load
A circuit for the protected alternating current power supply of an electrical load, the circuit including, in series, a protective circuit breaker and a bi-directional electronic switch in parallel...
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5933304 |
Apparatus and method of interrupting current for reductions in arcing of the switch contacts
A current interrupter circuit includes a primary current path and a secondary current path in parallel with one another and provided between input and output terminals. At least one solid state...
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5886860 |
Circuit breakers with PTC (Positive Temperature Coefficient resistivity
A Positive Temperature Coefficient Resistivity (PTC) element has a resistivity that increases as the temperature increases. Circuit breakers having PTC elements can achieve better overload and...
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5867356 |
Current limiting system and method
A current limiting system for a circuit limits current flow through the system. The current limiting system comprises at least one main switch comprising first and second main switch contacts and a...
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5854729 |
Power system device and method for actively interrupting fault current before reaching peak magnitude
A device/method for actively interrupting fault current in an ac or dc power system before the fault current is capable of growing to peak magnitude or steady state condition, respectively, is...
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5805393 |
Overcurrent protection circuit with improved PTC trip endurance
An overcurrent protection system which will give a rapid response to overcurrents which cause a reduction in the voltage across the load, e.g. a partial or complete short across the load, and which...
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5790354 |
Hybrid power switching device
A hybrid power switching device for eliminating mechanical relay arcing. The device reduces mechanical relay contact damage due to arcing and substantially reduces power dissipation by placing a...
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5737162 |
Circuit breaking device
An objective of this invention is to provide a DC circuit breaking device having functions for transmitting direct currents to an electric power system and interrupting direct currents to the...
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5737161 |
Overcurrent protection device and arrangement
Overcurrent protection arrangements including a relay comprising two coils wound on a common magnetic core and a PTC device coupled in parallel with the relay contacts. The arrangement comprises a...
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5736795 |
Solid state AC switch with self-synchronizing means for stealing operating power
A solid state power switching circuit for alternating current loads, in which operating power for the circuit is diverted from the switched current during power stealing intervals self-synchronized...
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5726843 |
Current limiting circuit breaker
A plurality of solid-state switches are provided in parallel with a main circuit switch. A main circuit current is detected by a first current detecting device. A current flowing in each of the...
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5699218 |
Solid state/electromechanical hybrid relay
A hybrid or combination solid state/electromechanical relay circuit combines the advantageous features of solid state and electromechanical relays but avoids their disadvantageous features. An...
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5668691 |
Arrangement for gas circuit breaker with reactor and capacitor connected in series and method for setting its circuit parameter
A small-sized arrangement for a DC circuit breaker with a reactor and a capacitor connected in series is provided which includes a DC circuit breaker, a parallel impedance means with a suitably...
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5666254 |
Voltage sensing overcurrent protection circuit
An overcurrent protection system which will give a rapid response to overcurrents which cause a reduction in the voltage across the load, e.g. a partial or complete short across the load, and is...
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5652688 |
Hybrid circuit using miller effect for protection of electrical contacts from arcing
An IGBT semiconductor device is connected across switching contacts which are to be protected from arcing. When the contacts are in a normally open configuration, the gate portion of the IGBT is...
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5650902 |
Substation for the distribution of electrical energy protected against arcing faults
Substation for the distribution of electrical energy, and protected against arcing faults, characterized by the fact that Hall-effect sensors and additional optical fiber conductors are provided as...
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5650901 |
Curcuit breaker and circuit breaking apparatus
A circuit breaker for a distribution system includes a non-self-extinction type semiconductor switch, a current limiting element connected in series to the semiconductor switch for suppressing a...
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