Electric power supply 4205 allow to pilot the opening/closing of the emergency electromagnetic 2SA. This device allow to reach electric economical mode who allow to reduce the electrical consumption of the braking system. 4205 integrate extra option compare to the 4200, this EPS allow to have progressive release of the electrical calipers from 100% to 50% of the nominal torque allowing lowering maneuvers by manual control (opened loop) or regulated control through a speed data feedback (closed loop).