H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/56
H01H 71/24 (2006.01) H01H 1/54 (2006.01)
Patent
CA 1071274
ABSTRACT OF THE DISCLOSURE This circuit breaker comprises closing-assist means for opposing the contact-repulsion forces developed when a high current flows through the circuit breaker. This closing-assist means comprises spaced segments of high permeability material fixed to opposite sides of the usual movable contact rod and projecting laterally there- from. Two stationary bridging members of high permeability material are located at opposite sides of said contact rod, and each extends between said segments when the contacts are engaged. The segments are located in proximity to but slightly spaced from the bridging members when the contacts are engaged so that said bridging members and said segments define a high permeability path around the contact rod containing short gaps between said segments and said brid- ging members. The flux resulting from current through the contact rod traverses said high permeability path and produces an attractive force between the bridging members and the segments acting on the segments in a direction to hold the contacts closed. Opening-assist means of a construction similar to that of the above-described closing-assist means acts to assist an opening operation when the contacts are separated a short distance by an opening impact.
272284
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