Electromagnetic actuator and electrical contactor comprising such actuator

摘要

The actuator has a control unit providing a ring voltage during closing operation of the actuator, and a maintaining voltage during maintaining operation of the actuator in a closed position, to a control coil (3). The control unit has a maintaining voltage regulating unit (50) with a step down transformer (51) that step-downs the ring voltage for providing the intermediate voltage lower and proportional to the ring voltage. Another step down transformer (52) step-downs the intermediate voltage for providing the maintaining voltage that is lower and proportional to the intermediate voltage.