Importance

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Abstract

In an arc interrupter fixed and movable contacts provide an openable current path. When the path between the contacts is opened an arc is generated between one of the contacts or a surface electrically continuous therewith providing an inner first arcing surface, and an electrode providing an outer second arcuate surface. The opening and closing of the current path is achieved by angular movement of the movable contact about an axis offset from the fixed contact. At least in the break position, the electrode surrounds and is separated by an annular gap from a coaxial arc-driving coil. The coil is accommodated within and is coaxial to the inner first surface and is included in series with both said surfaces in the arc current path at least during a later part of the movement of the movable contact to the break position for generating a magnetic field that rotates the arc to assist its extinguishment.

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First Claim