Adjustable-speed PACEMASTER DC Drives are robust, rugged and reliable. PACEMASTER 4 provides four-quadrant operation and is available in 1/4 to 2 HP ratings, operating from single phase 115 or 230 VAC. PACEMASTER 5 provides four-quadrant operation and is available in 3 to 5 HP ratings, operating from single phase 230 VAC. Each drive solution provides linear performance and EMI noise immunity.