The standard electrically held contactor consists of three vacuum bottles. Optimized for IntelliVAC control. An electro-magnet assembly and a mechanical linkage are used to close the contacts. When the IntelliVAC or IntelliVAC Plus control module receives a close command, the contactor coils (two connected in series) are energized and the current creates an electromagnet with the coils. The electromagnet pulls the armature plate towards the coil core, rotating the shaft and causing the actuator plate to move upwards. As the actuator plate moves, it pushes the insulator and movable shaft up, closing the contacts in the vacuum bottle. The IntelliVAC or IntelliVAC Plus control module supplies the current required to close the coils for 200 milliseconds. Afterward, the coil current is reduced to a lower hold-in value. When the IntelliVAC or IntelliVAC Plus control module has the close command removed, the coils are de-energized, opening the contactor.
