Circuit breaker trip unit employing a rotary plunger

Details Circuit breaker trip unit employing a rotary plunger Circuit breaker trip unit employing a rotary plunger

2005-07-26

2005-07-26

Lee, K. (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Latches

C200S400000, C200S401000, C335S167000, C335S176000, C335S023000

Reexamination Certificate

active

06921873

ABSTRACT:
A circuit breaker trip unit includes a housing and a rotary plunger pivotally mounted within the housing. The rotary plunger has an on position and a tripped position. A portion of the rotary plunger is pivoted outside of the housing in the tripped position. A trip bar is pivotally mounted within the housing and includes a first tab latching the rotary plunger in the first position and releasing the rotary plunger from the first position. The trip bar also includes a second tab. A trip actuator includes a solenoid and a rotary trip lever engaging the second tab of the trip bar, in order to pivot the trip bar and release the rotary plunger from the on position. A spring biases the trip bar, in order that the first tab latches the rotary plunger in the on position. A pair of springs biases the rotary plunger to the tripped position.

REFERENCES:
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patent: 6225883 (2001-05-01), Wellner et al.
patent: 6437261 (2002-08-01), Bryant et al.
patent: 6448522 (2002-09-01), Rosen et al.

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