Mitsubishi MR-J3-350B Servo Amplifier 3.5kW | Replacement, Equivalent & Selection Guide
The Mitsubishi MR-J3-350B is a 3.5 kW AC servo amplifier from the MELSERVO-J3 series, designed for high-precision motion control in industrial automation. This page provides full technical specifications, compatible replacement models, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MR-J3-350B |
| Manufacturer | Mitsubishi Electric |
| Series | MELSERVO-J3 |
| Rated Output | 3.5 kW |
| Control Mode | Position / Speed / Torque |
| Communication Interface | SSCNET III (High-speed serial bus) |
| Input Voltage | 3-phase 200–230 VAC, 50/60 Hz |
| Encoder Compatibility | 17-bit absolute / incremental encoder |
| Regenerative Brake | Built-in (external resistor optional) |
| Protection Rating | IP20 |
| Ambient Temperature | 0–55°C (operating) |
| Weight | Approx. 4.46 kg |
| Applicable Servo Motor | HF-SP352 / HF-SP352B and equivalents |
Compatible Replacement & Equivalent Models
When the MR-J3-350B is discontinued or unavailable, the following models are commonly used as direct or near-direct replacements:
| Model | Series | Rated Power | Interface | Compatibility Notes |
|---|---|---|---|---|
| MR-J4-350B | MELSERVO-J4 | 3.5 kW | SSCNET III/H | Direct upgrade; backward compatible with SSCNET III via adapter |
| MR-J4-350B-RJ | MELSERVO-J4 | 3.5 kW | SSCNET III/H + Safety | Adds functional safety (STO); recommended for new designs |
| MR-JE-70A | MELSERVO-JE | 0.75 kW | Pulse / Analog | Lower power; suitable only if load requirements allow downsizing |
| MR-J3-350B (Refurbished) | MELSERVO-J3 | 3.5 kW | SSCNET III | Drop-in replacement; verify firmware version |
Note: Always verify motor-amplifier pairing and controller compatibility before substitution. Contact Konmask for application-specific guidance.
Why Choose the Original MR-J3-350B
- Proven reliability in high-cycle manufacturing environments
- Native SSCNET III compatibility with existing Mitsubishi motion controllers (Q-series, L-series)
- Seamless integration with existing MR-J3 series infrastructure — no re-engineering required
- Established spare-parts ecosystem for maintenance and repair
- Lower total cost when replacing a single failed unit in a multi-axis system
Typical Applications
- CNC machine tools and machining centers
- Semiconductor and electronics assembly equipment
- Packaging and labeling machinery
- Robotic arms and multi-axis motion systems
- Printing and converting equipment
- Injection molding machine axes
System Compatibility
The MR-J3-350B is designed to operate within the Mitsubishi MELSERVO-J3 ecosystem:
- Motion Controllers: Q172DCPU, Q173DCPU, L72, LD75 series
- Servo Motors: HF-SP352, HF-SP352B, HF-SP502 (with derating)
- Software: MR Configurator2 (SW1DNC-MRC2), MT Works2
- Network: SSCNET III — up to 32 axes per controller
- Regenerative Options: MR-RB032, MR-RB12 external resistors
Selection Guide
Use the following criteria to confirm the MR-J3-350B is the right choice — or to identify the best alternative:
- Power match: Confirm motor rated output is 3.5 kW (HF-SP352 or equivalent)
- Network protocol: Existing system uses SSCNET III → MR-J3-350B or MR-J4-350B (with adapter)
- Safety requirements: STO/SBC needed → upgrade to MR-J4-350B-RJ
- Budget & lead time: Refurbished MR-J3-350B available for faster delivery at lower cost
- New design: Recommend MR-J4-350B for longer product lifecycle support
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Each unit undergoes functional testing and visual inspection before shipment
- Genuine Mitsubishi Electric products with traceable serial numbers
- Refurbished units include 90-day warranty; new units carry manufacturer warranty
- Export documentation and customs support available for international orders
How to Order
- Confirm your model number: MR-J3-350B
- Specify condition: New / Refurbished / Exchange
- Provide your shipping destination and required delivery timeline
- Contact us via email or phone for a quote — typically responded to within 24 hours
- Payment via T/T, PayPal, or trade terms for qualified accounts
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Replacement & Compatibility FAQ
Q: Can I replace MR-J3-350B with MR-J4-350B directly?
A: Yes, with the SSCNET III/H–SSCNET III conversion adapter (MR-J3ADPCBL03M). Motor wiring and parameters must be re-configured.
Q: Is the MR-J3-350B still in production?
A: Mitsubishi Electric has transitioned to the J4 series. MR-J3-350B is available as new-old-stock or refurbished through authorized surplus suppliers like Konmask.
Q: What servo motor pairs with MR-J3-350B?
A: The primary pairing is HF-SP352 / HF-SP352B (3.5 kW, 2000 rpm). Consult the MR-J3 catalog for full motor compatibility tables.
Q: Does MR-J3-350B support absolute positioning?
A: Yes, when paired with an absolute encoder motor and a battery backup unit (MR-J3BAT).
Q: What is the difference between MR-J3-350B and MR-J3-350A?
A: The “-B” suffix denotes SSCNET III bus interface; “-A” models use pulse/analog input. They are not interchangeable without controller changes.
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