Mitsubishi Electric MR-J4-350B Servo Amplifier

The Mitsubishi Electric MR-J4-350B servo amplifier delivers 3.5 kW of output power for high-speed, high-precision control of servo motors in demanding automation tasks. As part of the MELSERVO MR-J4 family, it accepts 200–240 VAC, 3-phase input, uses SSCNET III/H for fast, deterministic communication, and is compatible with high-resolution absolute/incremental encoders. Designed for CNC machinery, robotics, and automated production equipment, it supports position, speed, and torque control with a frequency response up to 2.5 kHz, along with Safe Torque Off (STO) and protections against overcurrent, overvoltage, overload, and overheating. Cooling is forced air, mounting is panel-mounted, and common replacements include MR-J3-350B, MR-J2S-350B, and MR-J4-350A.