Contact arm assembly for switchgear circuit breaker having improved cooling fins and contact fingers to maximize heat rejection

摘要

A contact arm assembly (10) for a switchgear circuit breaker includes a contact arm (11) having a groove (42) in an outer periphery surface thereof. At least one contact finger (13) has a body (38) and a ball member (40) extending from the body. The ball member is received in the groove so that the contact finger makes contact with the contact arm. The contact arm includes a shaft (14) having a longitudinal axis, first and second ends (18, 28), and a constant outside diameter. A plurality of annular rings (16) extends from the outside diameter of the shaft. The rings are spaced along the longitudinal axis to define cooling fins. Diameters of the rings gradually decrease from the first end to generally the center of the shaft, and then gradually increase to the second end of the shaft.

主权项

1. A contact arm assembly for a switchgear circuit breaker comprising:
a contact arm having a groove in an outer peripheral surface thereof, and at least one contact finger, the contact finger having a body and a ball member extending from the body, the ball member being received in the groove so that the contact finger makes contact with the contact arm, wherein a plurality of heat rejection fins extends from a periphery of the body of the contact finger.