Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1982-11-10
1985-03-05
Goldberg, E. A.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 23, H01H 7348
Patent
active
045034087
ABSTRACT:
A molded case circuit breaker apparatus is taught with an operating mechanism which is triggered in response to the movement of a trip bar. The trip bar in turn is responsive to current flowing in the main terminals of the circuit breaker apparatus. The trip bar is responsive to electrothermal conditions as a gradual overload increases. It is also responsive to a short circuit condition due to a magnetic reaction between an armature and an electromagnet. The armature is flexibly attached to the trip bar for flexible movement in one direction and non-flexible movement in the other direction so that a short circuit may be accommodated by a relatively small air gap by non-flexible movement of the armature and the trip bar to cause a tripping operation. On the other hand, a wide range of angular movement is available for a high degree of calibrated reaction to a wide range of overload currents because the armature member is flexibly attached to the trip bar in one direction and is held stationary against the facing magnet even after the trip bar continues movement for an otherwise non-allowable increment of electrothermal calibration.
REFERENCES:
patent: 2294838 (1942-09-01), Dorfman
patent: 2426880 (1947-09-01), Jackson et al.
patent: 2939929 (1960-06-01), Hobson, Jr.
patent: 3946345 (1976-03-01), Gryctko et al.
patent: 4231006 (1980-10-01), Belttory
Haugh Charles E.
Mrenna Stephen A.
Thomas Glenn R.
Andrews George
Goldberg E. A.
Moran M. J.
Westinghouse Electric Corp.
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