A multiphase medium voltage vacuum contactor

摘要

A multiphase medium voltage vacuum contactor comprising a mounting frame (10) on which there are positioned:
- for each phase, a current interrupter (1) comprising a vacuum bulb which contains a fixed contact and a corresponding movable contact;
- an actuator (20) for moving the movable contacts between a closed position where they are coupled each to a corresponding fixed contact and an open position where they are each electrically separated from the corresponding fixed contact, and an electronic unit driving the actuator. A voltage transformer (30) for feeding the electronic unit is mounted on the frame and is at least partially encased by an electrically insulating coating; one or more sacrificial fault-protection devices (50) are operatively associated to the voltage transformer and are embedded into the electrically insulating coating. Current sensors for motor protections can be also embedded into the insulating coating.