Tripping apparatus for use with an electrical circuit breaker ha

Details Tripping apparatus for use with an electrical circuit breaker ha Tripping apparatus for use with an electrical circuit breaker ha

1992-07-06

1993-08-17

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 21, H01H 7500

Patent

active

052372979

ABSTRACT:
An improved tripping mechanism for use in a circuit breaker wherein magnetic tripping is responsive to low levels of overcurrent by limiting the depth of engagement of a trip lever of a cradle with respect to the latch engagement tab of the armature. Responsiveness of the magnetic tripping is enhanced by positioning of the magnetic yoke adjacent to the bimetallic member while at the same time being movable with respect to the bimetallic member. Positioning the magnetic member independently of the position of the bimetallic member facilitates having magnetic tripping responsive to low overcurrent conditions while at the same time allowing thermal tripping by movement of the bimetallic member to be fully maintained.

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