US PATENT SUBCLASS 337 / 74
.~.~.~.~ Trip-free

Current as of: June, 1999
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337 /   HD   ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES

14  DF  ELECTROTHERMALLY ACTUATED SWITCHES {9}
36  DF  .~ With bimetallic elements (i.e., motion takes place in a plane at right angles to its major axis) {10}
37  DF  .~.~ With manual or other mechanical contact controlling means {12}
70  DF  .~.~.~ Latch or latch-release means {7}
74.~.~.~.~ Trip-free

DEFINITION

Classification: 337/74

(under subclass 70) Subject matter wherein the latch or latch release structure includes significant details of means which is operative, upon the occurrence of an abnormal condition in the controlled circuit, to prevent the main contacts from remaining closed or the latch from functioning regardless of the operation of a contact closing means, or wherein the main contacts are automatically opened upon the occurrence of an abnormal circuit condition independently of the position of a manual or other contact closing means.

SEE OR SEARCH CLASS

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,

24+, for similar devices combined with or particularly adapted for use in electromagnetic circuit breakers.