Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Latching means
Patent
1993-01-07
1994-04-05
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Latching means
335132, H01H 920
Patent
active
053009061
ABSTRACT:
A current switching device includes stationary contacts, and movable contacts which are movable between a position in which the movable contacts engage the stationary contacts and a position in which the movable contacts separate from the stationary contacts. The movable contacts are mounted on a movable contact holder. A magnetic locking element includes a permanent magnet and is pivotally mounted about a fixed axis. An actuation armature is connected to the contact holder and is movable to move the contact holder. The actuation armature is movable in proximity to the magnetic locking elements such that the actuation armature is locked to the magnetic locking element by magnetic attraction with the movable contacts engaging the stationary contacts. An opening armature is movable between a rest position and a position in proximity to the magnetic locking element, such that the opening armature is locked to the magnetic locking element by magnetic attraction. When the opening armature is in proximity to the magnetic locking element, the magnetic attraction between the actuation armature and the magnetic locking element is reduced such that the actuation armature is freed to permit the movable contacts to separate from the stationary contacts. A tripping device is sensitive to a current overload and causes the opening armature to move to the position in proximity to the magnetic locking element.
REFERENCES:
patent: 3453566 (1969-07-01), Kasahara
Blanchard Christian
Lauraire Michel
Vigouroux Didier
Donovan Lincoln
Telemecanique
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