US PATENT SUBCLASS 361 / 78
.~ With specific quantity comparison means

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

1  DF  SAFETY AND PROTECTION OF SYSTEMS AND DEVICES {32}
78.~ With specific quantity comparison means {5}
79  DF  .~.~> Voltage and current {3}
84  DF  .~.~> Reverse energy responsive (e.g., directional)
85  DF  .~.~> Phase
86  DF  .~.~> Voltage
87  DF  .~.~> Current

DEFINITION

Classification: 361/78

With specific quantity comparison means:

(under subclass 1) Subject matter wherein a specific electrical quantity (voltage, current, etc.) is sensed in the load circuit and compared with either a reference quantity of the same type or another specific electrical quantity to determine if a fault condition exists. The protective circuitry is activated when a difference in the magnitudes of the compared quantities is found to exist.

SEE OR SEARCH CLASS

340, Communications: Electrical,

661, for a voltage comparison condition responsive indicating device.