MR-J4-20B 200W SSCNET III/H Servo Amplifier | Mitsubishi

The Original New Mitsubishi MR-J4-20B is a 200 W (0.2 kW) digital AC servo amplifier from the MELSERVO-J4 series, designed for high-precision motion control in industrial automation systems. It operates on a 200–240 V AC single-phase or three-phase supply and communicates exclusively via the SSCNET III/H optical fiber network interface, receiving position, speed, and torque commands from compatible MELSEC motion controllers without pulse train input. Featuring a built-in dynamic brake, built-in regenerative resistor, and integrated Safe Torque Off (STO) safety function, this amplifier is a compact and reliable solution for multi-axis electronic assembly, medical device manufacturing, and precision inspection equipment.

Core Engineering Highlights:
200 W (0.2 kW) rated output | 1.5 A continuous output current | 4.5 A maximum output current (3× peak) | 200–240 V AC single-phase or three-phase input | SSCNET III/H optical fiber communication | 0.222 ms / 0.444 ms / 0.888 ms command communication cycle | Built-in dynamic brake | Built-in regenerative resistor | STO safety function (SIL 3 / PL e) | 40 mm width

Key Features:

• Original New Mitsubishi MR-J4-20B amplifier

• 200 W (0.2 kW) continuous rated output power

• 1.5 A continuous output current, 4.5 A maximum (3× peak)

• SSCNET III/H optical fiber network interface (150 Mbps full-duplex)

• Selectable command communication cycle: 0.222 ms, 0.444 ms, or 0.888 ms

• No pulse train input – commands delivered exclusively via SSCNET III/H

• Built-in dynamic brake for rapid deceleration

• Built-in regenerative resistor (10 W capacity)

• Safe Torque Off (STO) safety function

• Two-channel analog monitor output

• Natural cooling (self-cooling structure)

• Compatible with Mitsubishi HG-KR23 and HG-MR23 series servo motors

• 22-bit absolute encoder interface (262,144 pulses/revolution)

• Advanced vibration suppression control II and adaptive filter II

• J3 compatibility mode for legacy system migration

Applications:

• High-speed semiconductor assembly and pick-and-place equipment

• Multi-axis coordinated robotic joints and gantry packaging systems

• Precision linear positioning tables and metal forming machinery

• Medical device manufacturing and precision inspection equipment

• General industrial automation requiring compact multi-axis servo control

Technical Specifications:

System Compatibility:

• Compatible with Mitsubishi MELSEC motion controllers using SSCNET III/H communication

• Compatible with HG-KR23 and HG-MR23 series 200 W servo motors

• Supports J3 compatibility mode for use with existing MR-J3-B systems (HG series motors only)

• Configuration via MR Configurator2 software using USB connection

• Suitable for multi-axis systems with dense axis packing (40 mm width)

Related Products:

• MR-J4-10B – 100 W version (lower power)

• MR-J4-40B – 400 W version (higher power)

• HG-KR23 – 200 W low-inertia servo motor with 22-bit absolute encoder

• HG-MR23 – 200 W medium-inertia servo motor with 22-bit absolute encoder

• MR-BAT6V1SET – Battery for absolute encoder

• MR-J3ENCBL2M-A1 – Encoder cable, 2 m

• MR-PWS1CBL2M-A1 – Power cable, 2 m

• MR Configurator2 – PC software for parameter setting, tuning, and diagnostics

PLC ERA is an independent industrial automation distributor supplying genuine Original New products through established global supply channels. All products are factory sealed when applicable and undergo quality inspection prior to shipment. Mitsubishi, MELSERVO, and MELSEC are trademarks of Mitsubishi Electric Corporation.