Patent ID: 6479780
Filing Date: 2002-11-12
Classification: H01F,H01H

Abstract:
A circuit breaker having a plurality of terminals for a corresponding plurality of phases for a medium voltage or a high voltage network, comprising at each phase:at least one fixed contact and at least one corresponding moving contact to be engaged and disengaged with each other; a rotatable turning shaft for each phase having an axis of rotation, each corresponding moving contact being fastened to the turning shaft for rotation about the axis; a lever arm coupled to the turning shaft for each phase; a high voltage fuse at each phase, each fuse having an end including trip means thereat and further including a striker and a trip pin extending from the end of the fuse for engaging the lever arm, said shaft being rotatable between a first position wherein the lever arm engages the trip pin and a second extreme position wherein said lever arm is separated therefrom, said shaft having a dead spot therebetween adjacent to the first position, and said circuit breaker being electrically connected with the high voltage fuse at each corresponding phase; at least one link-spring mechanism for holding the at least one fixed contact and the corresponding movable contact in electrical contact at the first position and for separating them to the extreme position, the turning shaft being positionable a the first position adjacent the dead spot by the link-spring mechanism, and the turning shaft being rotatable over the dead spot; each lever arm engaging the trip means, said trip means being operable to release the lever arm for rotation from the first position over the dead spot to the second position with the turning shaft to thereby move the moving contact over the dead spot and out of engagement with the corresponding fixed contact; a casing for receiving the circuit breaker therein; and a feedthrough insulator fastened to the casing for electrically connecting the circuit breaker therethrough.