US PATENT SUBCLASS 335 / 18
.~.~ Responsive to predetermined or abnormal current condition (e.g., direction, phase angle or amplitude)

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.~.~ Responsive to predetermined or abnormal current condition (e.g., direction, phase angle or amplitude) {1}
19  DF  .~.~.~> Zero current

DEFINITION

Classification: 335/18

(under subclass 6) Subject matter wherein the structure includes means automatically responsive specifically to predetermined current values in the circuit to be controlled or to some abnormal current condition in the circuit, such as current reversal, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

155, for switching devices, which are not specifically claimed as automatic circuit interrupting devices, and having operative means responsive to predetermined current or voltage value.

SEE OR SEARCH CLASS

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

125+, for miscellaneous switching systems responsive to electrical conditions. 318, Electricity: Motive Power Systems, appropriate subclasses for motor control switches which may be responsive to predetermined condition or abnormal current or voltage value in a motor circuit.

337, Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses for electrothermal and thermally actuated switches, which may be set to operate at a predetermined current value.

340, Communications: Electrical,

635+, for signals and alarms responsive to a predetermined condition of electrical apparatus.

361, Electricity: Electrical Systems and Devices,

91.1+, and 93.1+ for safety and protection systems and devices responsive to predetermined condition such as voltage or reverse current.