Current limiting circuit breaker with high speed magnetic...

Details Current limiting circuit breaker with high speed magnetic... Current limiting circuit breaker with high speed magnetic...

H - Electricity

01

H

306/74

H01H 71/00 (2006.01) H01H 71/24 (2006.01)

Patent

CA 1116211

48,151 ABSTRACT OF THE DISCLOSURE A molded case current limiting circuit breaker includes separable contacts, an operating mechanism releas- able to effect automatic separation of the contacts, and a high speed electromagnetic trip device operable upon over- current conditions to release the operating mechanism and separate the contacts. The trip device includes a U-shaped pole piece disposed about a conducting path through the circuit breaker and a movable laminated armature mechani- cally coupled to the operating mechanism and magnetically coupled to the pole piece. The thickness of the armature is substantially greater than the thickness of the pole piece. During extreme overcurrent conditions electrodyna- mic force is produced upon the armature by magnetic flux in the pole piece. Upon saturation of the pole piece, force upon the armature continues to increase with increasing current due to electrodynamic force produced between the armature and the conducting path.

337291

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