THERMALLY RESPONSIVE ELECTRICAL CONTROL DEVICE FOR POLYPHASE CURRENTS

摘要

An electrical control device or overload relay characterized by relatively movable contacts with means for operating the contacts between open and closed positions and comprising an actuating bar, a plurality of pole units, each pole unit comprising an actuating bimetal element including an intermediate element and an outside element on each side thereof, the bimetal elements being spaced apart and disposed on one side of the actuating bar, a pair of levers between the bimetal elements and the actuating bar, one lever having one end portion in pivotal contact with the actuating bar and having another end portion in pivotal contact with the intermediate bimetal element on the side of the bimetal element opposite the actuating bar, and each lever having an intermediate portion in pivotal contact with the corresponding outside bimetal element and on the side thereof facing the actuating bar.