Patent ID: 6849813

Claim:
A preselector for an elongated tap selector switch of a tapped transformer comprising: a longitudinally extending housing of insulating material separate from the tap selector switch and extending therealong; a switch rod longitudinally displaceable in said housing; for each of a plurality of phases to be switched, a plurality of fixed preselector contacts mounted in said housing and spaced apart in a direction of displacement of said switch rod, each of said fixed preselector contacts having a circular portion concentrically surrounding said switch rod; and a respective contact bridge on said rod for each of said phases and adapted to selectively bridge between pairs of said preselector contacts of the respective phase upon displacement of said switch rod, each said contact bridge comprising a plurality of radially resilient contact members arranged around the switch rod and of a length sufficient to bridge between the pairs of preselector contacts such that each of said contact members is urged inwardly against a spring force as the respective contact bridge runs onto a preselector contact.