Patent ID: 7236071
Filing Date: 2007-06-26
Classification: H01H

Abstract:
1. A medium voltage vacuum contactor comprising: for each pole, a vacuum envelope which contains a fixed contact and a corresponding movable contact; and actuating means providing the energy required to move the movable contacts, wherein said actuating means comprise an electromagnetic actuator having a magnetic yoke which has an inner cavity communicating with the outside through at least a first opening, at least one coil accommodated in said cavity, a movable armature which is operatively connected to at least one movable contact through coupling means, said movable armature being mounted axially displaceable in said cavity along an axis of displacement with at least one end protruding from said first opening, and at least one permanent magnet devoted to directly hold said movable armature either in a first stable position in which said fixed and movable contacts are electrically coupled and in a second stable position in which they are electrically separated, and there are provided means for guiding the movement of said movable armature, said guiding means being positioned outside said yoke at at least said first opening, wherein said guiding means comprise at least a first substantially planar element having a through hole suitable to be operatively associated to said first opening and coupling teeth for connecting to supporting flanges fixed to the yoke.