Current limiting circuit breaker with improved magnetic...

Details Current limiting circuit breaker with improved magnetic... Current limiting circuit breaker with improved magnetic...

H - Electricity

01

H

306/82

H01H 73/36 (2006.01) H01H 77/10 (2006.01)

Patent

CA 1101471

47,367 CURRENT LIMITING CIRCUIT BREAKER WITH IMPROVED MAGNETIC DRIVE DEVICE ABSTRACT OF THE DISCLOSURE A current limiting circuit breaker comprises an improved slot motor magnetic drive device. The threshold level of overload current which produces current limiting action is raised, yet the degree of current limiting action during high overload currents is maintained by placing a thin saturable magnetic steel plate across the open end of the slot motor magnetic drive device. During overcurrent conditions below the threshold value, the plate shunts most of the magnetic flux and prevents production of magneto- dynamic force upon the contact arm. Above the threshold level, the overcurrent generates magnetic flux sufficient to saturate the plate and forces additional flux into the air gap where the flux interacts with the contact arm to drive the contact arm into the slot and produce current limiting action in a normal manner.

309315

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