Patent ID: 9418810
Filing Date: 2016-08-16
CPC Classification: H01H

Claim Text:
1. A multiphase medium voltage vacuum contactor for connection to an associated multiphase electrical circuit, comprising: a mounting frame on which there are positioned: for each phase, a current interrupter for operative connection to a corresponding phase of a multiphase electrical circuit, said current interrupter having a vacuum bulb which contains a fixed contact and a corresponding movable contact; an actuator for moving the movable contacts between a closed position where the movable contacts are coupled each to a corresponding fixed contact and an open position where the movable contacts are each electrically separated from the corresponding fixed contact; an electronic unit driving the actuator: a voltage transformer for feeding said electronic unit, the voltage transformer being mounted on said frame and at least partially encased by an electrically insulating coating; and one or more sacrificial fault-protection devices which are operatively associated to said voltage transformer and are embedded into said electrically insulating coating.