Part Number - MR-J4-20B

MR-J4-20B is

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Product Details

  • Melservo MR-J4 Servo Amplifier 200W (MRJ420B)
  • Manufacturer: Mitsubishi
  • Series: MELSERVO MR-J4

Product Description

The Mitsubishi MR-J4-20B (MRJ420B) is a Melservo MR-J4 series servo amplifier with an output wattage of 200W. The servo amplifier may connect to motors via the motor power cable to one of the amplifier’s terminal blocks and also by an encoder cable that may be connected to the CN2. There are five motors in which the MR-J4-20B may connect with the motors can be rotary, linear, or direct. The two rotary motors that may connect are the HG-KR23 and the HG-MR23. The two different linear motors that may connect are the LM-U2PAB-05M-0SS0 and the LM-U2PBB-07M-1SS0 motors. The TM-RFM002C20 direct drive may also connect to the MR-J4-20B.

The MR-J4-20B servo amplifier has a main circuit power supply is either a 3-phase or a 1-phase voltage between 200 to 240VAC and its frequency is 50/60Hz and a current of 1.5 Amp. The voltage of the amplifier is sanctioned to oscillate within the permissible range of 170 to 264VAC. The frequency can fluctuate between plus or minus 5%.

A SSC Network III/H can connect to the CN1A and the CN1B port of the servo amplifier employing the Servo System Control Network III cable. This allows the MR-J4-20B servo amplifier to connect with other amplifiers or system controllers. The command communication cycle for the SSCNET III/H is 0.222ms to 0.444ms to 0.888ms. Another possible connection is a USB communication connector that may be appended to the CN5 port. This authorizes a personal computer to have access and control over the MR-J4-20B servo amplifier and other applications connected to this amplifier.

Here is the manual referenced:

Technical Specifications

Part Number: MR-J4-20B (MRJ420B)
Module Type: Servo Amplifier
Voltage/Frequency: 200 to 240VAC, 3- or 1-phase 50/60Hz
Output Wattage: 200W
Weight: 1.76lbs (0.8kg)

Related Parts

F943GOT-LWD - Mitsubishi Operator Interface
MR-J4-100B - Mitsubishi Melservo MR-J4 Servo Amplifier
HC-UFS72K - Mitsubishi Melservo HC Servo Motor with KEY

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-J4 Shipping options vary by location. Call for an accurate quote.


  • The Mitsubishi MR-J4-20B 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-J4 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-J4 parts available for purchase.

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