The Mitsubishi MR-J4W3-444B is a digital AC servo amplifier from the MELSERVO-J4 Series, controlling two axes at 0.4 kW rated output each. It communicates over SSCNETIII/H, the high-speed synchronous motion bus that ties it to a compatible controller without pulse-train wiring or analog tach feedback. That means the loop closure and tuning happen inside the drive, not the PLC — useful when you need coordinated multi-axis moves over a single cable.
Mitsubishi MR-J4W3-444B AC Servo Amplifier, 2-Axis, 0.4 kW,
MPNMR-J4W3-444B
Mitsubishi MELSERVO-J4 Series, MR-J4W3-444B, digital AC servo amplifier, 2-axis, 0.4 kW per axis, SSCNETIII/H compatible.
$1,931.00 – $3,397.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Product type | Digital AC-Servo Amplifier MR-J4W-B |
| Parameter | Value |
|---|---|
| B | SSCNETIII/H compatible |
| MR-J4 | AC servo amplifier MELSERVO-J4 Series |
| Weight | 2.3 Kg |
| Number of axes | W2 = 2 |
| Rated output [kW] | 444 = 0.4 |
| Dimensions (LxWxH) | 19.5cm x 8.5cm x 16.8cm |
Product details
Frequently asked questions
What does SSCNETIII/H compatible mean for this drive?
It means the amplifier communicates over Mitsubishi's high-speed synchronous motion bus, carrying position commands and feedback over a single fiber-optic or electrical cable. No pulse-train wiring or analog tach feedback is needed — the loop closes inside the drive.
Will the MR-J4W3-444B drop into a panel specified around the FX5-80SSC-S?
No. The FX5-80SSC-S is a simple motion module that generates pulse trains to external drives. The MR-J4W3-444B is a network-based servo amplifier that requires an SSCNETIII/H controller. They are not electrically or mechanically interchangeable without rewiring the motion bus.
MPN
MR-J4W3-444B