Patent ID: 7148774

Claim:
A contact assembly for a circuit breaker, said contact assembly comprising: a line conductor having a folded back fixed contact end; a fixed contact mounted on the fixed contact end of the line conductor; a movable contact; and a movable contact arm having an inner edge, an outer edge, a first end and a second end, the movable contact mounted on the first end, the movable contact arm being pivotable about the second end between a closed position in which the inner edge extends adjacent the folded back fixed contact end of the line conductor with the movable contact in contact with the fixed contact to form a reverse current loop and an open position in which the movable contact is pivoted away from the fixed contact, the movable contact arm having a cross section that is narrower in width toward the outer edge opposite the inner edge than at the inner edge, wherein the movable contact arm comprises a first inner longitudinal member and a second outer longitudinal member, the first inner longitudinal member having a higher electrical conductivity than the second outer longitudinal member and the second outer longitudinal member having a higher shear strength than the first inner longitudinal member.