Circuit breaker including bridging contact with magnetic structu

Details Circuit breaker including bridging contact with magnetic structu Circuit breaker including bridging contact with magnetic structu

1999-03-19

2000-08-15

Scott, J. R.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Magnetic blowout

218 27, 218 31, 218 32, 218 36, 335 16, 335195, H01H 3318, H01H 7502

Patent

active

061039861

ABSTRACT:
A U-shaped magnetic plate is positioned on the side of a movable contact shoe opposite to a fixed contact shoe, and the tips of the respective legs of the magnetic plate face via a gap the movable contact shoe in a closed condition of the movable contact shoe. A magnetic plate is attached to the surface of the movable contact shoe at the side of the fixed contact, so that the magnetic plates form a closed magnetic circuit surrounding the movable contact shoe. If a high current, such as short circuit current, flows, a magnetic flux passing through the closed magnetic circuit induces an attractive force between the upper end surfaces of the U-shaper magnetic plate and the end surface of the magnetic plate. Accordingly, the movable contact shoe is rapidly opened to quickly interrupt the current, before a signal from an overcurrent trip apparatus operates an opening and closing mechanism. The opening speed of the movable contact shoe is increased when high current flows.

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patent: 5815058 (1998-09-01), Gizaw
patent: 5834724 (1998-11-01), Asakawa et al.

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