Selective trip unit for a multipole circuit breaker

Details Selective trip unit for a multipole circuit breaker Selective trip unit for a multipole circuit breaker

1997-11-12

1998-11-03

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 35, 335 41, 335172, H01H 7500

Patent

active

058314997

ABSTRACT:
A selective magnetic trip unit comprises a fixed magnetic armature located facing a movable magnetic armature and a damping device with a blade mounted on the movable magnetic armature. The damping device is designed to be in an inactive state up to an intermediate non-tripping position when the movable magnetic armature is attracted by polar parts of the fixed magnetic armature during a first travel, switching to the active state resulting from a deformation of the damping device during a second travel of the movable armature between the intermediate position and the final attraction position causing tripping of the circuit breaker.

REFERENCES:
patent: 3278708 (1966-10-01), Casey et al.
patent: 3384845 (1968-05-01), Johnson et al.
patent: 3950714 (1976-04-01), Mrenna et al.
patent: 5225800 (1993-07-01), Pannenborg et al.
patent: 5469121 (1995-11-01), Payet-Burin
patent: 5686709 (1997-11-01), Casagrande et al.

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