US PATENT SUBCLASS 361 / 44
.~.~ With differential sensing in a polyphase system

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}
42  DF  .~ Ground fault protection {5}
44.~.~ With differential sensing in a polyphase system

DEFINITION

Classification: 361/44

With differential sensing in a polyphase system:

(under subclass 42) Subject matter wherein the current going to and returning from the load in a polyphase system is compared by a sensing means and a sensed difference activates the protective circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

78, for specific quantity comparison means.