| Patent Number |
Title Of Patent |
Date Issued |
| 5295037 |
Molded case circuit breaker-process loop unit |
March 15, 1994 |
| An integrated protection unit is a circuit breaker which includes basic overcurrent protection facility along with selective electrical accessories. A molded plastic accessory access cover secured to the integrated protection unit cover protects the accessory components contained wit |
| 5243489 |
Protection circuit for multiple phase power system |
September 7, 1993 |
| A protection circuit for three-phase power systems incorporates overcurrent protection along with phase loss and phase imbalance by means of common current sensing transformers. The phase loss and phase imbalance are determined by a pairwise comparison algorithm. |
| 4967304 |
Digital circuit interrupter with electric motor trip parameters |
October 30, 1990 |
| A digital circuit interrupter includes a microprocessor programmed for tailored overcurrent protection to industrial power systems containing a plurality of electric motors as well as motor protective relays. A communication link permits the overcurrent set points to be selectively s |
| 4937757 |
Digital circuit interrupter with selectable trip parameters |
June 26, 1990 |
| A digital circuit interrupter includes a microprocessor programmed for tailored overcurrent protection to power systems. A communication link permits the over-current set points to be selectively set within the microprocessor memory from a remote location. The over-current trip param |
| 4876622 |
Circuit breaker warning relay and control accessory |
October 24, 1989 |
| A circuit breaker warning and control relay provides visual indication of an impending overcurrent condition. Sufficient time is thereby allotted for manual intervention to prevent damage to material and equipment utilized within sensitive manufacturing processes. The relay can be ar |
| 4741002 |
RMS calculation circuit |
April 26, 1988 |
| The root mean square value of sensed current within a protected circuit is calculated. A frequency multiplying circuit produces a pulse stream having a frequency proportional to the square of the amplitude of an analog signal representation of the circuit current. A root mean square valu |
| 4706158 |
Circuit breaker with self-contained electronic trip actuator and undervoltage release control ci |
November 10, 1987 |
| A molded case circuit breaker provides both overcurrent protection as well as accessory protection function by means of a self-contained electronic trip actuator module. Undervoltage release function is provided by a separate undervoltage release assembly that includes the undervoltage c |
| 4685024 |
Overcurrent circuit interrupter using RMS sampling |
August 4, 1987 |
| An electronic overcurrent circuit interrupter utilizes a digital processor for performing RMS sampling of circuit current for comparison to stored long time and short time current values and time delays before tripping the breaker. A magnetic core current transformer is employed for prov |
| 4672501 |
Circuit breaker and protective relay unit |
June 9, 1987 |
| Circuit protection and protective relay functions are provided by common circuit elements under the control of a single processor unit. Voltage and current values are obtained on a continuous basis and these values are continuously monitored within the processor to determine the electric |
| 4658323 |
RMS calculation circuit for digital circuit interrupters |
April 14, 1987 |
| The root mean square value of sensed current within a protected circuit is used to determine the occurrence of an overcurrent condition. A frequency multiplying circuit produces a pulse stream having a frequency proportional to the square of the amplitude of an analog signal represen |
| 4589052 |
Digital I.sup.2 T pickup, time bands and timing control circuits for static trip circuit breaker |
May 13, 1986 |
| Digital implementation of the overcurrent determination and time delay before tripping in a static circuit breaker trip unit allows the trip unit circuit to be manufactured in a single chip configuration. The signal after A/D conversion is compared within a magnitude comparator to de |
| 4550360 |
Circuit breaker static trip unit having automatic circuit trimming |
October 29, 1985 |
| An analog signal processor used within a static trip unit is provided with an A/D converter, a digital processor and an electrically alterable non-volatile memory (EAROM) for providing trimming and calibration facility to the trip unit. The EAROM provides the ability to store paramet |
| 4510611 |
Transceiver circuit for interfacing between a power line communication system and a data process |
April 9, 1985 |
| A transparent transceiver interface between a broadband power line communication system and a baseband data processor includes an autocorrelation receiver. The autocorrelation receiver achieves an extremely narrow bandpass function without passive elements. The receiver accepts wideb |
