The ES25 is a high efficiency device that optimizes the Voltage and Current (Static or dynamically) as the energy consumed increases in the approximately square of input voltage, hence the output energy would reach to an optimum level.

The diagram shows, the main winding A and secondary winding B, which is the inverse phase energy saving winding. When the supply current passes through winding A, magnetic restriction occurs in winding B, as B is connected in series to the load, the energy induced due to magnetic restriction in the reverse phase energy saving winding B, results in Voltage and Current optimization to reduce energy consumption up to 25%.