H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/60
H01H 73/48 (2006.01) H01H 71/40 (2006.01) H01H 71/52 (2006.01)
Patent
CA 1110299
THERMAL-MAGNETIC CIRCUIT BREAKER ABSTRACT OF THE DISCLOSURE The present invention relates to circuit breakers of a par- ticular 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 nor- mally 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 con- tact arm, without resort to a current-carrying coil for the elec- tromagnet.
330174
Horton Arnold
Roy Nilendu
Federal Pacific Electric Company
Gowling Lafleur Henderson Llp
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