Overload/open-phase tripping device for circuit breaker

Details Overload/open-phase tripping device for circuit breaker Overload/open-phase tripping device for circuit breaker

2005-09-06

2005-09-06

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

C337S041000, C337S049000

Reexamination Certificate

active

06940374

ABSTRACT:
An overload/open-phase tripping device for a circuit breaker includes a plurality of bimetallic elements arranged in a row; a differential shifter mechanism; and a tripping lever for transmitting a force applied by the differential shifter mechanism to a switching mechanism. The differential shifter mechanism includes a push shifter having a plurality of operation ends; a pull shifter having a plurality of operation ends; and a differential lever disposed between the push shifter and the pull shifter. The differential lever is provided with an action end for applying the force to the tripping lever upon an overload, and an action end for applying the force to the tripping lever upon an open-phase. The two action ends face the tripping lever, and the action end for the open-phase is located at a position farther from the tripping lever than the action end for the overload.

REFERENCES:
patent: 4642597 (1987-02-01), Sako
patent: 4814737 (1989-03-01), Ebnet
patent: 4845455 (1989-07-01), Sako et al.
patent: 5767762 (1998-06-01), Sako
patent: 6621403 (2003-09-01), Nagahiro et al.
patent: 6816055 (2004-11-01), Weber

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