Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1985-10-22
1987-02-17
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335 56, 335 62, 335240, H01F 312, H01F 708
Patent
active
046443126
ABSTRACT:
A circuit breaker includes a tripping device in which a magnetic core is contained in a vessel of viscous fluid in a magnetic frame. An armature is disposed adjacent the core and is connected to a toggle mechanism. Under conditions of moderate overloads, the armature and the core ineract and the tripping device provides a time delay before it operates. Under severe fault conditions the armature is activated directly and the effect of the core is of less significance. The core or the armature are tapered, to provide a desired balance between the delayed and instantaneous operating characteristics.
REFERENCES:
patent: 3713059 (1973-01-01), Tada
patent: 3900810 (1975-08-01), Grenier
patent: 4276526 (1981-06-01), Ciarcia et al.
Baines, deceased Alfred H. P.
Baumgartl Walter A.
Campetti Gianfranco
Nusse Klaus J. R.
Donovan Lincoln D.
Goldberg E. A.
Heinemann Electric (South Africa) Limited
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