Thermal-magnetic circuit breaker

Details Thermal-magnetic circuit breaker Thermal-magnetic circuit breaker

1978-06-22

1982-02-16

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 43, 337 75, H01H 7512

Patent

active

043161634

ABSTRACT:
The present invention relates to circuit breakers of a particular class, namely, the type in which a toggle is manually erected to drive a "heart" as a unit for closing the circuit breaker. The "heart" includes a contact arm, an actuator, and overcurrent releasable latch means which collectively form a normally latched unit. Under excess-current conditions, the latch means releases the actuator, and contact arm then opens the circuit.
The latch means includes a conventional bimetal fixed at one end to the contact arm. The bimetal carries a pivoted latch lever, and is surrounded by a core-and-armature unit adjacent its secured end, for operating the latch lever in response to high overcurrents. High magnetic trip sensitivity is achieved in a construction wherein the whole electromagnet moves with the contact arm, without resort to a current-carrying coil for the electromagnet.

REFERENCES:
patent: 2631208 (1953-03-01), Page
patent: 2842635 (1958-07-01), Cole
patent: 2854546 (1958-09-01), Cole
patent: 2876309 (1959-03-01), Wiktor
patent: 3134871 (1964-05-01), Norden
patent: 3784940 (1974-01-01), Torre

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