US PATENT SUBCLASS 335 / 20
.~.~ Voltage responsive (under, over or no voltage)

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}
20.~.~ Voltage responsive (under, over or no voltage)

DEFINITION

Classification: 335/20

(under subclass 6) Subject matter wherein the structure includes means automatically responsive specifically to predetermined values, or some abnormal condition, of the voltage existing in the circuit to be controlled, such as, for example, over-voltage under-voltage or no voltage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

155, for electromagnetic switches, not specifically claimed as automatic circuit interrupters, having means responsive to a predetermined voltage value.

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307, Electrical Transmission or Interconnection Systems, appropriate subclasses, particularly

130, for switching systems which are voltage responsive. 361, Electricity: Electrical Systems and Devices,

88+, for voltage responsive safety or protection systems, and subclasses 139+ for relay systems which may be responsive to predetermined voltage levels.