US PATENT SUBCLASS 335 / 19
.~.~.~ Zero current


Current as of: June, 1999
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335 /   HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS

2  DF  ELECTROMAGNETICALLY ACTUATED SWITCHES {30}
6  DF  .~ Automatic circuit-interrupting devices (e.g., circuit-protective devices) {12}
18  DF  .~.~ Responsive to predetermined or abnormal current condition (e.g., direction, phase angle or amplitude) {1}
19.~.~.~ Zero current


DEFINITION

Classification: 335/19

(under subclass 18) Subject matter wherein the automatically responsive means is designed to be actuated when the current in the circuit to be controlled falls to a zero value.