Patent ID: 7298236

Claim:
A circuit breaker electromagnetic tripping device, comprising: a casing; a tripping armature and a tripping armature spring which are disposed transversely within the casing; a tripping coil fitted over the casing at a position corresponding to the tripping armature; a moveable support which is disposed longitudinally within the casing and moveable inside the casing and a lower end of the moveable support can be engaged with or disengaged from a front end of the tripping armature; an attracting armature and an attracting armature spring which are disposed longitudinally at a center of the moveable support; an attracting coil fitted over the casing at a position corresponding to the attracting armature and a longitudinal central axis of the attracting coil is consistent with that of the moveable support; and a plurality of moveable contact assemblies which are disposed at two sides of the moveable support.