The MR-J4-100B-RJ is a MELSERVO J4 servo drive from Mitsubishi, rated for 1 kW output on a single-phase 200 VAC supply. It communicates over SSCNET III/H — Mitsubishi's high-speed motion bus — and runs full closed-loop control, meaning the encoder feedback is used for both commutation and position/velocity regulation, not just motor phasing.
The 1 kW output rating governs the motor it can drive — pair it with a Mitsubishi HG-JR or HG-SR servo motor of the same power class. The single-phase 200 VAC input means it draws from a standard industrial line; no step-down transformer needed for 200 V class systems. SSCNET III/H is a fiber-optic motion network with deterministic cycle times down to 0.222 ms, so this drive integrates natively into a Mitsubishi motion chain without a protocol gateway.