The MR-JE-40A+HG-KN43J is a matched pair from Mitsubishi: an MR-JE-_A servo amplifier paired with an HG-KN43J AC servo motor, part of the MR-JE series and the HG-KN low-inertia, small-capacity motor family. Rated output is 0.4 kW at 3000 r/min, with a rated current of 2.8 A and a maximum current of 7.8 A. Maximum torque hits 3.8 N·m. The motor includes an oil seal (J designation), making it suitable for applications where lubricant ingress is a concern. Control is sine-wave PWM current control — standard for this class of servo drive, delivering smooth torque at low speeds and quiet operation across the speed range. The general-purpose interface (A type) means it accepts standard pulse-train or analog speed/torque commands without a dedicated fieldbus module.
The 0.4 kW rated output and 3000 r/min base speed match a 400 W motor frame — typical for small indexing tables, pick-and-place axes, or conveyor diverters where the load inertia is low. The 3.8 N·m maximum torque gives roughly 3× the rated torque for short bursts during acceleration or deceleration, which is enough for most light-duty positioning moves. The 2.8 A rated current sets the continuous thermal limit; the 7.8 A maximum current is what the amplifier can deliver transiently, so the upstream power supply and cabling must be sized for the peak draw, not just the continuous rating.