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    The
    Mitsubishi MR-J4-40B is an AC servo drive/amplifier, not a sewing machine. It is an industrial automation component designed to control servo motors, used in applications such as material handling systems, robots, and CNC machines. 
    Product Overview 
    The MR-J4-40B belongs to the Mitsubishi Electric MELSERVO J4 series, known for high-speed response (2.5 kHz) and high-resolution encoders. 
    • Function: AC motion servo drive/amplifier with a built-in dynamic brake and regenerative resistor.
    • Rated Output: 400 W (0.4 kW).
    • Supply Voltage: 200-240 VAC (single or three-phase input).
    • Communication: Features SSCNET III/H communication capability.
    • Safety: Includes a Safe Torque Off (STO) safety function.
    • Compatibility: Compatible with servo motors like the Mitsubishi HG-KR43. 
    Regarding "Sewing Machine" 
    While Mitsubishi does manufacture industrial sewing machines (that often use these types of industrial motors and controls), the part number MR-J4-40B specifically refers to the servo amplifier/drive unit used within a broader automation system, not the complete sewing machine head itself. Juki acquired Mitsubishi's sewing machine division in 2023, so newer models and support are branded as Juki. 
    Where to Find More Information or Purchase 
    You can find detailed technical specifications and purchasing options from industrial automation suppliers and distributors: 
    • Mitsubishi Electric US
    • Valin Online
    • DO Supply 
    Units, both new and used/refurbished, are also commonly available on platforms like eBay. 
    • MR-J4-40B - AC servo drives (Mitsubishi Electric)
      +55°C ambient - equivalent to MRJ440B. Contact for availability. Please add this item to cart to request a quote or contact us at ...
      MITSUBISHI ELECTRIC Global website
    • MR-J4-40B - AC servo drives - Mitsubishi Electric
      * Marca principal. Mitsubishi Electric. * AC servo drive. * MELSERVO J4 series. * MR-J4 series. * AC motion servo drive / amplifie...
      MITSUBISHI ELECTRIC Global website
    • Mitsubishi MR-J4 Rotary Servo Motors Datasheet
      HG-SR. 1000 (1500) 6 Types. 0.5, 0.85, 1.2, 2.0, 3.0, 4.2. X. - - IP67. HF-SP. Medium inertia. This series is. available with. two...
      Valin Corporation
    • Mitsubishi MR-J4-40B Used | eBay
      NS Electric Store (613) 100% positive feedback. $430.00. As low as $38.61/mo with As low as $38.61/mo with Klarna.
      eBay
    • Mitsubishi MR-J4-40B, 1S8004 - eBay
      Item description from the seller * Condition: New. * Manufacturer Code: MR-J4-40B. * Brand : Mitsubishi Electric. * Type: cnc cont...
      eBay
    • Mitsubishi MR-J4-40B - In Stock Ships Overnight - DO Supply
      Table_title: Technical specifications for MR-J4-40B Table_content: header: | Manufacturer | Mitsubishi | row: | Manufacturer: Prod...
      DO Supply
    • SERVO AMPLIFIERS & MOTORS - AutoCont Control Systems
      Page 6. Backed by Mitsubishi MELSERVO's. global track record of proven reliability, the new MR-J4 takes machine. performance to th...
      AutoCont Control Systems
    • Mitsubishi Sewing Machines - MJ Foley Company
      In 2023 Juki acquired the sewing machine division of Mitsubishi Corp. Moving forward, machinery and controls formerly branded as M...
      MJ Foley Company
    • MR-J4-40B - AC servo drives (Mitsubishi Electric)
      +55°C ambient - equivalent to MRJ440B. Contact for availability. Please add this item to cart to request a quote or contact us at ...
      MITSUBISHI ELECTRIC Global website
    • MR-J4-40B - AC servo drives - Mitsubishi Electric
      * Marca principal. Mitsubishi Electric. * AC servo drive. * MELSERVO J4 series. * MR-J4 series. * AC motion servo drive / amplifie...
      MITSUBISHI ELECTRIC Global website
    • Mitsubishi MR-J4 Rotary Servo Motors Datasheet
      HG-SR. 1000 (1500) 6 Types. 0.5, 0.85, 1.2, 2.0, 3.0, 4.2. X. - - IP67. HF-SP. Medium inertia. This series is. available with. two...
      Valin Corporation
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