Part Number - MR-J3-20B

MR-J3-20B is

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Product Details

  • Melservo MR-J3 Servo Amplifier (MRJ320B)
  • Manufacturer: Mitsubishi
  • Series: MELSERVO MR-J3

Product Description

The Mitsubishi MR-J3-20B (MRJ320B) is a 200W, 200V Melservo MR-J3 servo amplifier. The power supply has a voltage that is 3-phases and 1-phase. The voltage ranges from 200 to 230VAC for the 3-phases or 230VAC for the 1-phase. Both types of voltages in the MR-J3-20B servo amplifier have a frequency of 50/60Hz. Nevertheless, the voltage is allowed to have a larger range. For the 3-phase voltage, the sanctioned scope of the voltage is 170 to 253VAC; while, for the 1-phase voltage, the potential extendable compass of the voltage is 207 to 253VAC. The frequency is permitted to oscillate between +5% to -5% of 50/60Hz.

The MR-J3-20B servo amplifier can only attach to two disparate servo motors: HC-KP23 and HC-MP23. These servo motors may connect by the way as is described below.

The MR-J3-20B servo amplifier has five ports and three connectors. The CN2 port may connect to the encoder of the servo motor nominated. Two of the ports, the CN1A and CN1B ports, connect to other MR-J3-B servo amplifiers. The CN1A port would connect to a CN1B port of the foregoing servo amplifiers while if the CN1B port is utilized, this servo amplifier would attach to the CN1A port of a succeeding servo amplifier. The CN1A port can also connect to a MELSEC Q series motion control module. Both the CN1A and CN1B port of the MR-J3-20B servo amplifier utilize the SSCNET III. Lastly the CN5 port may connect to a personal computer that has a MR Configurator; this personal computer can then connect to a MELSEC Q series or FX series positioning or motion module.

Here is the manual referenced:

Technical Specifications

Part Number: MR-J3-20B (MRJ320B)
Module Type: Servo Amplifier
Voltage/Frequency: 200 to 230VAC, 3-phase 50/60Hz; 230VAC, 1-phase 50/60Hz
Output Wattage: 200W
Weight: 1.76lbs (0.8kg)

Shipping and Order Information

  • TRW Supply can usually ship in stock items same day before 3:30 PM EST for no extra cost and before 5 PM with a rush fee
  • Mitsubishi MELSERVO MR-J3 Shipping options vary by location. Call for an accurate quote.


  • The Mitsubishi MR-J3-20B comes with a two year warranty.
  • A three year warranty is available. Please inquire for pricing.

Additional Information

TRW Electric & Supply Company is a global automation supplier. We deliver reliable new and refurbished parts at a great value. Our product focus is Omron and Mitsubishi products, but we have been able to provide our customers with solutions from other manufacturers as well. Our goal is to supply the automation industry with the best service and pricing, and of course conduct business with a high level of integrity.

Authorized Distributors

A Mitsubishi Authorized Distributor for MELSERVO-MR-J3 is not the only source for Mitsubishi products. Many of the Mitsubishi products have been discontinued and therefore are no longer available from authorized suppliers. TRW Electric & Supply has many new and refurbished Mitsubishi MELSERVO-MR-J3 parts available for purchase.

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