MR-J4-350A4-RJ
Buying MR-J4-350A4-RJ from Flexa Systems
Buy the Mitsubishi MR-J4-350A4-RJ MELSERVO-J4 servo drive, in stock brand new, or send yours to Flexa Systems for repair. Rated 480V, 7.9A and 3.5KW, it runs from a 480V supply and drives a servo axis sized to that output, typically a heavier axis on packaging, material handling or machine tool equipment. When it replaces a failed MELSERVO-J4 drive, the servo motor, its feedback device and the axis parameters must all match what the old drive was running. A refurbished MR-J4-350A4-RJ is available on request, bench-tested before shipment with the same 2-year warranty, at 30-60% below the cost of new.
Repair option: send in your faulty unit for component-level repair — $1,090.00 with free diagnostics, a 2-year warranty, and a 5–30 business day turnaround. Repair typically costs 40–70% of a new unit, saving you 30–60%. Learn more about our Mitsubishi repair and servo drive repair service.
MR-J4-350A4-RJ at a glance
| Part Number: | MR-J4-350A4-RJ |
| Manufacturer: | Mitsubishi |
| Voltage: | 480V |
| Current: | 7.9A |
| Power: | 3.5KW |
| Type: | MELSERVO J4 Series |
| Control Modes: | Position, velocity, torque |
| Communication: | General-purpose interface: pulse train position command, analog speed/torque command |
| Feedback: | Absolute multi-turn encoder |
| Safety: | Safe Torque Off (STO) and SS1 as standard - EN ISO 13849-1 cat. 3 PL d, IEC 61508 SIL 2 |
| Enclosure: | IP67 |
| Software: | MR Configurator 2 |
MR-J4-350A4-RJ FAQ
What must match before swapping in an MR-J4-350A4-RJ?
Confirm that the servo motor on the axis suits a 480V, 7.9A, 3.5KW drive and that its feedback device matches what the original drive used. Back up or record the parameters from the old MELSERVO-J4 unit so the axis can be restored without retuning from scratch.
Refurbished or brand new MR-J4-350A4-RJ: which should I order?
Brand new units are in stock, which suits getting a stopped axis running again quickly. Refurbished drives are available on request and work well as planned spares or for budget-limited machine rebuilds. Both carry the same 480V, 7.9A, 3.5KW rating.
Can I trade in a failed MELSERVO-J4 MR-J4-350A4-RJ?
Yes. Use the Trade-In button on this page to get a free evaluation of your unit. Any credit is applied toward the purchase of your replacement.
Compatible alternatives
Equivalent units from other manufacturers — all in-stock at Flexa, covered by the same 2-year warranty.
