Patent ID: 6977568
Filing Date: 2005-12-20
Classification: H01H

Abstract:
1. A moving contact assembly for electric power switching apparatus comprising: a carrier body; carrier legs supporting the carrier body for pivotal movement between a closed position and an open position; an outer carrier secured to the carrier body and having an outer carrier stop; an inner carrier mounted in the outer carrier for pivotal movement between a withstand position and a blow open position and having a cam profile and an inner carrier stop; a plurality of contact fingers mounted on the inner carrier; a cam follower pin; and cam springs seated against the outer carrier biasing the cam follower pin against the cam profile, the cam profile being configured so that for current through the plurality of contact fingers less than a threshold current the inner carrier is biased to the withstand position which is established by the inner carrier stop engaging the outer carrier stop, and for current through the plurality of contact fingers greater than the threshold current, the inner carrier rapidly pivots to the blow open position.