(57) A circuit breaker comprises first and second main contacts (14,16) relatively movable
between closed and open positions, and, when closed, forming part of a main current
path through the circuit breaker. First and second arcing contacts (30,32) form part
of an arc current path through the circuit breaker, and contact movement is effected
so that during opening of the breaker the main contacts separate and an arc is located
between the first and second arcing contacts. The first arcing contact (30) is annular,
and the second arcing contact (32) lies in the space within the open centre of the
annular contact. An arc-driving coil (28) surrounds the annular contact and is connected
in series therewith in the arc current path. The second arcing contact and a conductor
assembly connected thereto, which assembly forms part of the arc current path, are
substantially symmetrical with respect to the radial mid- plane of the coil.
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