Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1989-03-31
1990-11-27
Broome, H.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 42, 335176, H01H 7510
Patent
active
049739280
ABSTRACT:
A molded case circuit breaker is provided with a magnetic trip device which allow for a relatively wide range of adjustment. The magnetic trip device allows the magnetic air gap to be varied as well as the spring force on the plunger. Additionally, the magnetic trip device allows the force required to rotate the trip bar to be varied. By providing a means for adjust the force required to rotate the trip bar, the adjustment range of the magnetic trip device can be substantially enhanced. The molded case circuit breaker includes at least one pair of separable main contacts. The separable main contacts are mounted on upper and lower contact arms. The lower contact arm may be rigidly mounted to a line side conductor, while the upper contact arm is pivotally mounted to a load side conductor. The upper contact arm is mechanically coupled to an operating mechanism. A pivotally mounted trip bar is operatively coupled to the operating mechanism. In a normal condition, the trip bar allows the operating mechanism to be latched. When the trip bar is rotated, the operating mechanism becomes unlatched and opens the separable main contacts.
REFERENCES:
patent: 3777293 (1973-12-01), Tuzuki
patent: 4503408 (1987-09-01), Grunert et al.
patent: 4691182 (1987-09-01), Mrenna et al.
patent: 4697163 (1987-09-01), Mrenna et al.
patent: 4713639 (1987-12-01), Grunert et al.
Broome H.
Donovan Lincoln
Moran M. J.
Westinghouse Electric Corp.
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