The Cooper Power Systems' Auto-Booster regulator is a single-phase autotransformer for voltage regulation without the high degree of sophistication of thirty-two step regulators. It provides four-step voltage boost or buck (depending on connection) with a 6% or 10% range. Each step represents 1-1/2% voltage change for 6% units and 2-1/2% change for 10% units. Auto-Boosters are equipped with a simplified control with fixed bandwidth and fixed time delay. These regulators are intended for use on laterals with a limited number of tap changes per day.