|
Match
|
Document |
Document Title |
|
|
4027123 |
Vacuum circuit breaker comprising series connected vacuum interrupters and capacitive voltage-distribution means
This circuit breaker comprises a plurality of vacuum interrupters electrically connected in series. The voltage distribution across the interrupters is controlled by a plurality of capacitive...
|
|
|
4025820 |
Contactor device including arc supression means
An electrical contactor device includes a solid state arc suppression circuit connected in parallel with main relay contacts. Auxiliary contacts provide gating signals to the arc suppression...
|
|
|
4021699 |
Device for limiting currents
The combination of a current limiting device and at least one openable isolating point electrically connected therewith, the current limiting device including a variable, pressure-sensitive...
|
|
|
RE29172 |
Voltage-dividing DC circuit breaker and method
The voltage dividing DC circuit breaker comprises serially connected high voltage and low voltage switches to carry load current. Serial capacitors are connected in parallel thereto and a crossed...
|
|
|
3921038 |
Static surge-current limiter
A solid state or static current limiter which provides a relatively low impedance electrical current conducting path between a source of power and a load or between two interconnected sources or...
|
|
|
3889131 |
Long life reliable relay
A long life reliable relay for applying a voltage to a load in which the voltage is coupled to the load through a first contact assembly preferably comprising a plurality of radially resilient...
|
|
|
3868549 |
CIRCUIT FOR PROTECTING CONTACTS AGAINST DAMAGE FROM ARCING
This disclosure deals with a circuit for substantially reducing or eliminating switch contact damage due to arcing when opening or closing the switch contacts under heavy AC current load...
|
|
|
3867669 |
POWER SOURCE WITH A SPARKPROOF OUTPUT
A power source with a sparkproof output, comprising a transformer with a rectifier, a spark proofing unit for limiting electric energy released as a result of commutation of the output circuit of...
|
|
|
3809959 |
CIRCUIT INTERRUPTING MEANS FOR HIGH-VOLTAGE DIRECT CURRENT
A high voltage direct current interrupting arrangement consists of two electrical switches connected in series. One of the switching devices is a commutating circuit breaker which is connected in...
|
|
|
3783305 |
ARC ELIMINATION CIRCUIT
A circuit arrangement for eliminating arcs formed across a set of contacts on the opening or closing thereof comprising a thyristor connected across the contacts to be protected. The control...
|
|
|
3739192 |
NON-OSCILLATING ARCLESS SWITCHING OR INDUCTIVE D.C. LOADS
A circuit interrupter for arclessly interrupting current flow to an inductive D.C. load, comprising first and second switches which are functionally offset, in opening sequence, by a predetermined...
|
|
|
3736439 |
CURRENT-LIMITING SWITCH EMPLOYING LOW TEMPERATURE RESISTOR
A circuit interrupter is provided with a parallel-connected resistor which is cooled to a temperature of from 4° K to 80° K, but higher than the critical temperature of the resistance material....
|
|
|
3736437 |
VACUUM SWITCH APPARATUS
A vacuum switch apparatus comprising a vacuum switch having a pair of electrodes, and a series circuit consisting of a resistor and capacitor disposed between one of said electrodes and ground to...
|
|
|
3729655 |
PROTECTIVE CIRCUIT ARRANGEMENT FOR A SWITCHING TRANSISTOR IN AN INDUCTIVE LOAD CIRCUIT
A protective circuit arrangement for a switching transistor in an inductive load circuit has a series circuit consisting of a resistor and a controlled auxiliary valve shunted across the...
|
|
|
3711668 |
SWITCH WITH SURGE PROTECTION
An insulating member of metal oxide varistor material separates the two conductive parts of a hermetically sealed enclosure to which the electrodes of the switch are attached. The metallic oxide...
|
|
|
3697774 |
THYRISTOR CIRCUITS FOR APPLYING A VOLTAGE TO A LOAD
Thyristor circuits are disclosed for applying a voltage to a load wherein substantial improvements are provided with respect to increasing the operating life of switch contacts employed therein. A...
|
|
|
3678289 |
MAGNETIC FIELD CONTROL CIRCUIT FOR CROSSED FIELD SWITCHING DEVICES
A conducting crossed-field switching device in a high voltage circuit can be offswitched by temporarily reducing the magnetic field to non-conductive conditions. While high voltage rises across the...
|
|
|
3668374 |
DRIVE CIRCUIT FOR PULSED INDUCTIVE WINDINGS
A pulse forming drive circuit for a high speed counter actuated by a solenoid wherein a pulsing switch controls the energization of the solenoid. The drive circuit is connected in parallel with the...
|
|
|
3656022 |
ALTERNATING CURRENT CIRCUIT BREAKER COMPRISING A SERIES REACTOR FOR SHAPING CURRENT AND VOLTAGE WAVES NEAR CURRENT ZERO
Discloses an a-c circuit breaker comprising the series combination of a reactor and a circuit interrupter that opens in response to overcurrents. The reactor saturates during a severe overcurrent...
|
|
|
3656024 |
TRANSIENT PROTECTION FOR ELECTRICAL IRRIGATION CONTROL SYSTEMS
Current induced in an electrical irrigation control system by lightning, for example, is delayed and discharged around the relay contacts and solid state components of the individual sprinkler...
|
|
|
3651375 |
PROTECTIVE CIRCUIT FOR A THYRISTOR TYPE SWITCH
The invention concerns a protection device for a thyristor type switch comprising a protection circuit consisting of two Zener diodes of opposite conductivity in series with each other and in...
|
|
|
3646355 |
AUTOMATIC POWER TRANSFER SWITCH
A static switch is operated upon sensing a loss of a primary power supply r providing a rapid temporary connection of a secondary power supply to a load. Slower acting power contactors are also...
|
|
|
3639808 |
RELAY CONTACT PROTECTING CIRCUITS
A contact protecting circuit for a relay having its operating coil energized from a DC supply and its contact controlling an AC load circuit. A triac connected in parallel with the contact conducts...
|
|
|
3636292 |
VACUUM SWITCH FOR ALTERNATING CURRENT INTERRUPTION
A vacuum switch for alternating current interruption comprises two pairs of separable operating contacts arranged in a vacuum chamber and connected in an alternating current circuit. A...
|
|
|
3633069 |
ALTERNATING CURRENT CIRCUIT-INTERRUPTING SYSTEM COMPRISING A RECTIFIER SHUNT PATH
A medium- or high-voltage switching system for AC current comprising two series-connected switches substantially simultaneously opened by random operated opening means. The first switch is shunted...
|
|
|
3622867 |
LOAD TAP CHANGER SYSTEM INCLUDING PROTECTIVE APPARATUS FOR MONITORING THE OPERATION THEREOF
A load tap changer system for electrical transformers, including a tap selector switch, a bypass switch, a vacuum switch, and a divider reactor, interconnected to interrupt load current in the...
|
|
|
3617862 |
ARCLESS LOAD TAP CHANGING APPARATUS
A load tap changing voltage regulator has a dial type tap-changing switch and an odd-even switch integral therewith having first and second pairs of contacts connected in series with first and...
|
|
|
3590357 |
BATTERY BOOSTER
A system for use in boosting the weak battery of a vehicle to permit operation of the starter of such a vehicle including at least one booster battery for providing the required energy for boosting...
|
|
|
3571614 |
TRANSISTOR SWITCH WITH MINIMIZED TRANSITION POWER ABSORPTION
A transistor switch, an inductor and the load are serially connected so that during turn-on transition of the transistor, the inductor holds back current flow until the transistor is saturated. A...
|
|
|
3562584 |
ARC-SUPPRESSING SWITCHING DEVICE
An arc-suppressing switching device particularly for application to bimetallic element containing thermostats of electric blankets, electric irons, electric cookers, electric foot warmers, and the...
|
|
|
3558977 |
HYBRID CIRCUIT BREAKER HAVING MEANS FOR DETECTING THE LEADING EDGE OF THE ARC VOLTAGE AT THE CONTACTS THEREOF
A hybrid circuit breaker comprising a pair of contacts actuated by an electromagnet, a thyristor for shunting the contacts, an extinction condenser for the shunt thyristor, an extinction thyristor...
|
|
|
3558910 |
RELAY CIRCUITS EMPLOYING A TRIAC TO PREVENT ARCING
Disclosed is circuitry for controlling the flow of current from an AC source to a load and includes a bilateral semiconductor switch such as a semiconductor triac connected in parallel with the...
|
|
|
3555353 |
MEANS EFFECTING RELAY CONTACT ARC SUPPRESSION IN RELAY CONTROLLED ALTERNATING LOAD CIRCUITS
A relay controlled alternating current load circuit having a set of relay switch contacts connected in series with the load across the alternating current source is provided with a bilateral...
|
|
|
3543047 |
CONTACT ARC SUPPRESSOR USING VARISTOR ENERGY ABSORBING DEVICE
|
|
|
3539775 |
DOUBLE-MAKE CONTACT SWITCHING APPARATUS WITH IMPROVED ALTERNATING CURRENT ARC SUPPRESSION MEANS
|
|
|
3538276 |
HIGH-VOLTAGE CIRCUIT BREAKER HAVING TWO-STEP CLOSING RESISTANCE
|
|
|
3538278 |
HIGH VOLTAGE ELECTRIC CIRCUIT BREAKER
|
|
|
3538277 |
HIGH VOLTAGE CIRCUIT BREAKER WITH RESISTANCE MEANS
|
|
|
3534226 |
SEQUENTIAL SWITCHING CIRCUIT BREAKER FOR HIGH POWER AC OR DC POWER TRANSMISSION CIRCUITS
|
|
|
3525927 |
CONSTANT VOLTAGE AC POWER SUPPLY
|
|
|
3524104 |
PARALLEL ASSISTED CIRCUIT INTERRUPTION DEVICE WITH INTERLOCK
|
|
|
3515940 |
PARALLEL-ASSISTED CIRCUIT INTERRUPTING DEVICE
|
|
|
3504233 |
ELECTRIC CIRCUIT INTERRUPTING DEVICE WITH SOLID STATE SHUNTING MEANS
|
|
|
3489873 |
TRIGGERED VACUUM TYPE CIRCUIT INTERRUPTER
|
|
|
3475620 |
HEAVY CURRENT ARCING SWITCH
|
|
|
3474293 |
ARC SUPPRESSING CIRCUITS
|
|
|
3469048 |
VACUUM-TYPE CIRCUIT BREAKER HAVING PARALLEL TRIGGERED-TYPE CIRCUIT INTERRUPTERS
|
|
|
3466503 |
ASSISTED ARC A.C. CIRCUIT INTERRUPTION
|
|
|
3462646 |
CIRCUIT BREAKER WITH HIGH SPEED CIRCUIT RESTORING MEANS
|
|
|
3454832 |
ELECTRIC CIRCUIT INTERRUPTER
|