Control scheme for the operation of an electric motor actuator for a medium to high voltage circuit breaker

A contact actuating unit for an electrical circuit breaker, the contact actuating unit comprising:

• an electro-mechanical device, wherein an actuator of the electro-mechanical device is configured to be connected to a contact arrangement in the electrical circuit breaker;
• a control unit configured to control the electro-mechanical device to move the actuator and to bring the contact arrangement from a first position to a second position;
• and
• a motion trajectory and feed forward controller configured to provide one or more data signals,
• wherein at least one of the provided data signals is indicative of a predetermined force or torque value adapted to command the control unit to move the contact arrangement with the actuator to a predetermined position,
• wherein the predetermined force or torque value from the motion trajectory and feed forward controller corresponds to at least one desired travel curve of the contact arrangement in the electrical circuit breaker, or
• wherein the predetermined force or torque values are derived from a system model, wherein the system model represents one or more mechanical or electrical parameters of the contact actuating unit or of the electrical circuit breaker or travel curves.