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Danfysik has developed a novel Slow Kicker Magnet Power Supply ERMPPS (Energy Recover Magnet Pulsed Power Supply) with associating magnet achieving high stability, long flat top and low energy consumption. Two Slow Kicker Magnet Systems have been built to Rutherford Apple ton Laboratory (RAL), one low and one high current supply. The magnets are laminated window frame type. The ISIS synchrotron at RAL produces high energy proton bunches at 50 Hz rate. The Slow Kickers operate at 10 Hz, directing a portion of the extracted protons to a second beam line. The flat top width is 600 musec with a flat top and peak-peak stability better than 100 ppm. The rise and fall times are 12 msec. The power supply has been developed having following highlights: High accuracy with adjustable output current from nearly zero, wide range setable flat top width and rise time, energy recovery, digital flat top and rise time regulation loop in FPGA and variable repetition frequency down to one shot operation. The flat top width and rise time settings are bounded by the actual load and internal component values.