Product details
MR-J4-500B: High-Power Single-Axis Servo Amplifier
The MR-J4-500B is a servo amplifier from Mitsubishi. It controls one axis with high precision. The STO (Safe Torque Off) safety function shuts down motor output in critical situations. It uses 3-phase 200-240 VAC power for steady motor control. A built-in dynamic brake helps stop the motor quickly and safely.
- Brand: Mitsubishi
- Model: MR-J4-500B
- Series: MELSERVO MR-J4
- Type: Servo Amplifier (single-axis)
- Rated Capacity: 5 kW
- Output Current: 28 A
- Safety: STO (IEC/EN 61800-5-2)
- Main Power: 200-240 VAC, 3-phase, 50/60 Hz
- Control Power: 200-240 VAC, 1-phase, 0.3 A
- Interface: SSCNET III/H
- Brake: Dynamic brake built-in
- Control Method: Sine-wave PWM, current control
- Cooling: Force cooling, IP20 open type
- Power Consumption: 45 W (max)
- Weight: 6.80 kg (15.00 lbs)
Why Choose MR-J4-500B?
- 5 kW rated power handles heavy industrial loads.
- SSCNET III/H interface enables fast, real-time control.
- STO safety cuts torque without removing power.
- Dynamic brake shortens stopping time for rotating motors.
- Force cooling keeps the unit stable under high load.
Expert Review
The MR-J4-500B delivers strong 5 kW output in a compact design. Its SSCNET III/H communication ensures low-latency motion control. The built-in dynamic brake and STO make it safe for high-speed axes. For demanding single-axis jobs, this amplifier is a reliable workhorse.
Manager’s Insight
Choose this drive when you need raw power and network integration. It works best with Mitsubishi’s SSCNET III/H controllers. The IP20 rating means install it inside a clean cabinet. Use an external reactor if your line has power noise. With 12-month warranty and fast shipping, it is a low-risk buy for system integrators.
Applications & Compatible Equipment
- CNC routers – spindle or heavy-duty axis
- Injection molding machines – injection and clamp axes
- Large packaging lines – high-torque rotary cutters
- Industrial presses – precise ram control
- Test stands – torque or position control loops
- Works with 3300 5mm Proximity Probes for position feedback in harsh environments.
Professional FAQ
- Can I use MR-J4-500B without a network controller?No. This B model requires an SSCNET III/H master to run.
- What happens during a dynamic brake failure?The motor will coast to stop. STO still provides safe torque off.
- Does the warranty cover lightning damage?No. Only manufacturing defects are covered for 12 months.
- How do I select between 350A and 500B?Pick 350A for pulse input and lower power (3.5 kW). Pick 500B for network control and 5 kW power.
- Is the 12-24 hour shipping real?Yes. Orders before 2 PM local time ship same day. Carriers: FedEx, UPS, DHL.
Selection Guide
- Confirm your motor power ≤ 5 kW and voltage 200-240 VAC.
- Use only with SSCNET III/H compatible controllers.
- Add an external regenerative resistor for high inertia loads.
- Keep 100 mm free space around the unit for cooling.
- For multi-axis, buy one MR-J4-500B per axis.
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