Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1979-03-26
1980-10-28
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 37, 335 43, 337 75, H01H 7348
Patent
active
042310067
ABSTRACT:
A circuit breaker is provided with a thermally responsive latching member connected in circuit between a load terminal and a movable contact. A mounting member, holding a portion of the latching member adjacent one end thereof, is pivotally mounted in the circuit breaker housing. A U-shaped field piece is affixed to the mounting member with legs of the piece extending at both sides and toward the latching member, and toward an armature spaced on the opposite side of the latching member. The armature has its associated armature spring provided with an annular boss which is adapted to fit within a locating hole in the latching member. The field piece is adapted to intercept lines of flux of a magnetic field created by a predetermined amount of current flowing through the latching member to attract the armature to rotate the latching member thereby disengaging a latching surface of the latching member from a trip arm, releasing the trip arm for movement to a tripped position. A mounting spring bears against the housing and urges the field piece against a support member, and further urges the armature spring against the latching member and positions the boss into the locating hole.
REFERENCES:
patent: 3671908 (1972-06-01), Belttary et al.
patent: 3909764 (1975-09-01), Belttary
Broome Harold
Fisher Fred
Sylvania Circuit Breaker Corporation
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