Mitsubishi Electric MR-J3-20B Servo Amplifier

The Mitsubishi Electric MR-J3-20B Servo Amplifier (MRJ320B) is an AC servo drive that provides precise position, speed, and torque control for Mitsubishi servo motors in automated motion systems. Designed for industrial automation, it offers digital feedback and tuning for smooth motion, with input power of 200–230 VAC three-phase and a rated output current of approximately 2–3 A (model dependent), making it well-suited for applications requiring rapid, repeatable motion and precise positioning. It accepts a pulse train or compatible network interface as the command input and uses encoder feedback (incremental or absolute depending on setup) to achieve accurate positioning. Protection features include overcurrent, overvoltage, overtemperature, and phase loss; cooling is provided by an integrated heatsink with optional forced-air cooling, and mounting supports panel or control cabinet installation. Common applications include CNC machining centers, robotics, pick-and-place systems, conveyors, packaging equipment, printing machines, and automated assembly lines. Common replacements include Mitsubishi MR-J3-40B servo amplifier and Mitsubishi MR-J2S-20B servo drive.