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4853820 |
Electronic circuit breaker systems
Electronic circuit breakers safeguard a load connected to a power supply against damage from overload conditions. These circuit breakers interrupt flow of overload currents to the load by...
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4758919 |
Sectionalizer for spur lines
Fault currents in the phases of a three-phase supply are detected by transformers 28 in respective phase links 14 and are counted by associated circuits 24 when any one of the circuits 24 reaches a...
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4751606 |
Circuit interrupter apparatus with a battery backup and reset circuit
A circuit interrupter includes a circuit arrangement for sampling a conditioned current value and determining operating characteristics related to the current flow through an electrical circuit....
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4707759 |
Universal fault circuit interrupter
Improved shock and electrical-fire protection circuits provide line-to-ground plus "line-to-line" fault protection in a power system, and monitor conditions after protective interruption to safely...
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4678984 |
Digital power converter input current control circuit
A digital power converter input current control circuit is connected between a power converter and a power source. This circuit monitors, and controls if necessary, the current that flows between...
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4642724 |
Trip signal generator for a circuit interrupter
A trip signal generator comprises a circuit possessing an inverse time-current characteristics for producing a trip signal in response to the occurrence of overcurrent in an alternating current...
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4634936 |
Intrinsically safe miner's lamp
An intrinsically safe battery pack arrangement for electrically powering electrical devices is disclosed. The power pack has a device for electronically determining a short in a cable or device and...
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4555742 |
Short detection circuit and method for an electrical load
A short detection circuit and method for operatively controlling current in an electrical load such as an alternator field coil includes a driving device such as a Darlington transistor for driving...
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4513343 |
Short circuit protector having fold-back trip point for solid state switching device
A transistor circuit (18) is series connected with a solid state switching device (14) and a load (4) controlled by that device (14) to protect that device (14) from overcurrents resulting from...
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4455509 |
Intrinsically safe lighting system
An intrinsically safe lighting system for energizing fluorescent lamps and the like in potentially flammable or explosive atmospheres is disclosed wherein one or more intrinsically safe power...
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4438473 |
Power supply for an intrinsically safe circuit
An intrinsically safe power supply employing a binary current interrupter connected between the power source and the electrical load. Normally the load is situated in a potentially dangerous...
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4360851 |
Electronic circuit breaker
An electronic circuit breaker is tripped to interrupt the flow of current to a load when the load experiences an over-current condition and is automatically reset by disconnection thereof from the...
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4358810 |
Circuit breaker with alarm
A circuit breaker and alarm device for a circuit having a series connected interruptible current device whereupon a circuit breaker tripping means, attached to said circuit breaker, is adapted to...
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4202023 |
Overload protector
A rapid-response overload protector interposed between a voltage source and a load powered thereby, the protector effectively decoupling the load from the source when the current drawn thereby...
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4148088 |
Electronic circuit breaker
An electronic circuit breaker feeding a d-c/d-c converter from a power supply common to several such converters includes a normally saturated main or switching transistor T 1 in series with the...
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3991366 |
Means for indicating abnormal high current flow in a high voltage electric power distribution conductor and for resetting and testing same
An indicator for flow of fault current in a conductor is enclosed in a housing carrying a metallic clamp for detachable mounting on the conductor. The indicator is operated by closure of a switch...
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3936700 |
Electronic overcurrent protection of a DC data transmission circuit
An overcurrent-protection network for a transmission line logic system is disclosed, including a line switch in said line subject to over-current conditions and an added threshold-responsive logic...
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3805113 |
ELECTRICAL ENERGY DISTRIBUTION SYSTEM
An energy distribution system includes several automatic switches connected in series to a feed line, and energy distribution busbars are connected between adjacent switches in the series. Each...
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3735248 |
APPARATUS HAVING AUTOMATIC RE-SET MEANS FOR DETECTING A FAULT CURRENT
A device for detecting fault current. The device senses the current in a line and converts it to a proportional voltage signal. The voltage signal is used to switch a solenoid to first and second...
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3686531 |
FAULT LOCATING SYSTEM FOR ELECTRICAL CIRCUITS
A fault locating system for electrical circuits consisting of three major components, a fault sensor, a control circuit or channel, and an indicating device. The fault sensors indicate an abnormal...
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3685035 |
FAULT INDICATING APPARATUS
Disclosed is fault indicating apparatus responsive to normal and excessive current associated with an external circuit conductor being monitored, the fault indicating apparatus including an...
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3500394 |
CONTROL APPARATUS
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3431486 |
PROTECTION CIRCUIT INCLUDING POWER DISSIPATION LIMITING MEANS
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3317791 |
Circuit-controlling systems
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3294987 |
Overload protective device
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3109961 |
Automatic circuit recloser with cold load pickup means
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2921238 |
Closing control scheme for a circuit breaker
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