What it is and what drives the fit decision
The Mitsubishi MR-J4-10B-RJ020 is a servo amplifier in the MR-J4 series, rated for 0.1 kW output on a 1-phase 200 VAC supply. It communicates over SSCNET III/H, Mitsubishi's high-speed motion network, and supports full closed-loop control — meaning the drive reads encoder feedback directly from the load, not just the motor, to correct for mechanical backlash or compliance.
What the ratings mean for the panel
The 0.1 kW rating sets the continuous mechanical power the amplifier can deliver to the motor — sized for small indexing tables, pick-and-place axes, or tensioning spindles. The 1-phase 200 VAC supply is common in Asian and European machine-tool panels; verify the incoming line is single-phase, not three-phase, before wiring. Full closed-loop control adds an encoder input for load-side feedback, which catches lost motion in belts or couplings that a motor-only loop would miss.