Matches 101 - 150 out of 253 < 1 2 3 4 5 6 >
Match Document Document Title
4631621 Gate turn-off control circuit for a solid state circuit interrupter  
A gate turn-off thyristor is connected across a pair of separable contacts for diverting the interrupted current first to the thyristor and then to a metal oxide varistor connected across the...
4626951 Singular housing of switch and protective semiconductor  
A switch comprises a mechanical switch element having contacts and a semiconductor switching element, the mechanical switching element and semiconductor element being connected in series or in...
4623948 Switching aid device  
The switching aid device includes, in the case of a main static switch, (1), a switching aid capacitor (10), parallel connected to the main static switch (1) via a loading diode (11) and, parallel...
4622513 Gating of the thyristors in an arcless tap changing regulator  
A voltage regulator using electronic control of two static switch circuits to permit tap changing without arcing at the switched electrical contacts, without interrupting the load current, and...
4618905 DC circuit breaker  
A line voltage charging type DC circuit breaker for use in DC transmission, having a series circuit connected in parallel with a commutation breaker, the series circuit being constituted by a...
4613801 Trolling motor foot control with arc suppressor  
A trolling motor on a bass boat is connected to batteries by closing a relay switch. Arcing at the switch contacts is suppressed by two capacitors, in series, nonpolarized relation, shunted across...
4598330 High power direct current switching circuit  
A DC power switching circuit connecting a load to a DC power source while suppressing arcing across a relay in the network. A normally open relay has its energizing coil connected to the control...
4594630 Emission controlled current limiter for use in electric power transmission and distribution  
Method and apparatus are provided for an emission controlled current limiting device. The apparatus may control the current thermionically, by cold cathode emission, by photo-emission, or with...
4583146 Fault current interrupter  
A fault current interrupter is provided by the parallel combination of a positive temperature coefficient resistor and a voltage dependent resistor connected across a pair of separable contacts to...
4568995 Electromagnetic interference suppression in a vehicle horn circuit  
In a military vehicle having an electric horn actuator circuit, the improent comprising the addition of a capacitor in the circuit at a location between a brush and contact ring assembly disposed...
4566051 Inverter protected in respect of the rates of increase of current and voltage  
A single-phase or multi-phase inverter protected with respect to the rates of increase of current and voltage, the said inverter comprising a filter capacitor and a choke protecting with respect to...
4555658 Circuit arrangement for the compensation of reactive power in an electrical alternating-current power system  
A compensation circuit for reactive power balance includes a capacitor, inductor and rectifier connected in series to a power system. In order to protect the rectifier from misfires of the...
4531172 Electric circuit breaker with a remote controlled static switch  
The invention relates to a miniature circuit breaker having remote control capabilities. The protection function of the circuit breaker is ensured by a magnetothermal release cooperating with an...
4525762 Arc suppression device and method  
An apparatus for the suppression of arcs at the contacts of a three phase ac electrical power contactor which has three pairs of electrical contacts and a solenoid-actuated plunger operable to open...
4516182 Current limiting apparatus  
A current limiting apparatus includes bridging electrical contacts forming a first current path across a gap in a conductor, a trigger for breaking said first current path in response to an...
4500934 Hybrid switching device employing liquid metal contact  
A hybrid electrical current switching device comprises a triggerable solid-state current switch connected in parallel with a mechanical switch in which the current flow depends on the relative...
4496941 Switch protection device  
In the particular embodiments described in the specification a device is provided to protect against failure of a switch connected to a load and to give an alarm that the switch has failed. The...
4470005 Static VAR generator having a thyristor circuit arrangement providing reduced losses  
An auxiliary thyristor control circuit inserts a zinc oxide varistor in series with the capacitor bank of a static VAR generator for discharging the capacitor bank when the static VAR generator is...
4466038 Hybrid power switch  
A hybrid power switch for AC voltage in which an SCR switch is in parallel with a mechanical switch. They are operated so that the SCR switch is closed whenever the mechanical switch is to be...
4459629 Electric circuit breaker utilizing semiconductor diodes for facilitating interruption  
This electric circuit breaker comprises a main switch and two shunting paths respectively paralleling said main switch, each shunting path containing the series combination of an isolating switch...
4445183 Electrical switch  
An electrical switch or power controller is provided controlling the application of a source voltage to a load under the control of an electrical command signal, resulting in the development of a...
4438472 Active arc suppression for switching of direct current circuits  
A DC arc suppression circuit is disclosed for suppressing arcs which occur across a mechanical switch or circuit breaker. Several embodiments are described which employ a bipolar transistor to...
4420784 Hybrid D.C. power controller  
A hybrid D.C. power controller of the relay/circuit breaker type that uses a hybrid arrangement of hard contacts (4) and power FET's (18, 20) in cooperative functional combination as the arc...
4392171 Power relay with assisted commutation  
The contacts of a power relay are shunted by a gateable semiconductor device to assist in the commutation of contact-destroying arcs upon making and breaking of the power relay contacts;...
4389691 Solid state arc suppression device  
An arc suppression device (40) for protecting the load carrying contacts (30, 31, 32) of a power contactor (20) includes gate controlled semiconductor devices (TR1, TR2, TR3) connected in parallel...
4363060 Arcless tap changer for voltage regulator  
A tap changer voltage regulator permits a tap changer selector contact to engage an open circuited new tap without arcing and has a half-tap voltage auxiliary winding which permits halving the...
4360847 Diode assisted relay contactor  
A switching circuit having hybrid contactors connects the three output lines of a 3 phase AC power source to three input lines of a load, such as a motor and the like. A single pair of relay...
4356525 Method and circuit for controlling a hybrid contactor  
A method and circuit for minimizing DC current offset generated by the voltage-integrating property of an inductive load. First, second and third hybrid contactors connect first, second, and third...
4346420 Magnetoplasmadynamic switch  
A magnetoplasmadynamic switch adapted to be coupled in parallel with an ictive energy storage circuit carrying current through an initially closed circuit interrupter. The switch includes an...
4314300 Fused short circuit and grounding switch  
A fused short circuit and grounding switch for interconnection in a main circuit, the switch having a switch member operable in one position thereof as a part of the main circuit and operable in...
4301489 Arcless tap changer utilizing static switching  
A tap changer voltage regulator permits a tap changer switch selector contact to engage an open-circuited new tap without arcing and has a half-tap voltage auxiliary winding which permits halving...
4300181 Commutation circuit for an HVDC circuit breaker  
A commutation circuit for a high voltage DC circuit breaker incorporates a resistor capacitor combination and a charging circuit connected to the main breaker, such that a commutating capacitor is...
4296449 Relay switching apparatus  
A switching circuit for selectively coupling a load to an A.C. power source is disclosed. The switching circuit includes a diode-commutated master relay contact and a pilot relay contact coupled in...
4291255 Plasma switch  
A plasma switch comprising a substantially evacuated chamber, a generally tubular cathode disposed within the chamber, an elongated anode disposed concentrically within and projecting from the...
4274122 Energizing and quick deenergizing circuit for electromagnetic contactors or the like  
An improved circuit for energizing and quickly deenergizing the DC operating winding of an electromagnetic relay or contactor from sources of AC supply. It employs a full wave rectifier bridge, a...
4271460 Soft turn-on power  
A circuit for suppressing surge or transient currents between a DC power supply and a capacitive load includes a suppression impedance of relatively high impedance connected in series with the load...
4251845 Arc suppressor circuit  
An arc suppression device for protecting the load carrying contacts (25) of a power contactor (15) includes semiconductor devices (TR1, SCR1,SCR2) connectable in parallel with such contacts through...
4241369 Electrical power source for an electronic flash unit  
An electrical power supply for an electronic flash unit with a main capacitor charged by a current flowing from a direct-current source through an electrical power source switch to the main...
4225895 Device for closing or interrupting an electric alternating current arising on a line  
The present invention relates to a device which is created in such a way that it can close or interrupt an electric alternating current arising on a line at its zero passage. The current mentioned...
4216513 D.C. Circuit breaker  
A capacitor and an inductance are connected in parallel with an interruptor disposed in a d-c circuit before the interruptor is mechanically opened. An oscillating current i o occurs in a circuit...
4209814 Synchronous circuit breaker  
A high power a-c circuit breaker having substantially no arcing during interruption consists of two identical switching circuits in series which each include a main high speed switch connected in...
4201938 Voltage regulator which eliminates arcing during tap changes  
A tap changer voltage regulator permits a tap changer switch selector contact to engage an open circuited new tap without arcing and has a half-tap voltage auxiliary winding which permits halving...
4198668 High-voltage direct current interuption devices  
a spark gap device in a high-voltage direct current interrupting device maintains a substantially constant ignition voltage by constructing the spark gap device in at least two series-connected...
4171532 Thyristor pulse control circuits  
A thyristor pulse control circuit has a main thyristor, a commutation circuit including a commutating capacitor, and a bypass contactor connected across the main thyristor, and is provided with...
4152634 Power contactor and control circuit  
The power contactor for controlling the application of power to and the character of the current to a load includes a power relay having contacts connected between a source of power and the load,...
4148085 Interconnection circuit-breaker and electric power installation employing same  
High-voltage interconnection circuit-breaker, having connected in parallel, in the first instance a main chamber, having a cut-out power, comprising a rapid functioning on opening and provided for...
4131927 A.C. power supply circuit with surge current suppression  
The current surge, normally associated with the initial application of a nominal A.C. current to an inductive load, is prevented by preventing the magnetic core of the inductive load from being...
4121268 Electrolytic cell vacuum switching system  
A vacuum switch system for interrupting electrolytic cell circuits designed to operate at very high current, relatively low DC voltage. The DC voltage is above the minimum cathode drop potential...
4075673 Operating system for generator circuit-breakers  
The invention concerns a system of several circuit-breakers controlling separate circuits fed by the same generator and in which the circuit-breakers are provided with a main cut-out chamber (C 1 ,...
4074333 A.C. Relay system  
An A.C. relay system for making and breaking an A.C. power line utilizing an electromagnetic relay having a coil for opening and closing the mechanical switching contacts, a bilateral gated...
Matches 101 - 150 out of 253 < 1 2 3 4 5 6 >