US PATENT SUBCLASS 335 / 37
.~.~.~.~ With thermal element comprising magnetic flux source

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}
21  DF  .~.~ With latch or trip means {6}
35  DF  .~.~.~ Plural trips or combined operating means for single trip (e.g., magnetic with thermal) {2}
37.~.~.~.~ With thermal element comprising magnetic flux source

DEFINITION

Classification: 335/37

(under subclass 35) Subject matter wherein the trip structure includes at least one thermal element, which element acts as a winding or flux source for a magnetic device. Usually, in the patents classified here, the thermal element acts as a delayed tripping device while the magnetic device operates instantly upon excessive current in the thermal device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

141+, for other electromagnetically operated switches with additional thermal current responsive means.

SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers,

3, for multiple circuit control switches with thermal current responsive means. 361, Electricity: Electrical Systems and Devices,

99, for safety and protective systems including devices with combined thermal electromagnetic relay means, one of which may act instantaneously.