Circuit breaker mechanism.

摘要

A circuit breaker actuating mechanism has a magnetic frame (120) and a load coil (122), with a magnetic pole piece (116) which is aligned with the axis of the coil. An elongate L-shaped armature (128) pivots on the magnetic frame and has a head (130) which moves transversely relative to the axis of the coil towards the pole piece. The pole piece is typically circular in section, and the head of the armature has a circular recess (134) which matches the shape of the pole piece. The head of the armature has a pair of projections (146, 148) which extend relatively close to the pole piece when the armature is in a retracted position, increasing the initial attractive force between the pole piece and the armature. The mechanism is relatively simple and economical to manufacture, and offers an improved pull-in force. <IMAGE>