Part Number - MR-J4-350B

MR-J4-350B is

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Product Details

  • Melservo MR-J4 Servo Amplifier (MRJ4350B)
  • Manufacturer: Mitsubishi
  • Series: MELSERVO MR-J4

Product Description

The Mitsubishi MR-J4-350B (MRJ4350B) is a 200V servo amplifier from the MR-J4 series whose output wattage of 3.5kW. The 3-phase main circuit power supply and the 1-phase control circuit power supply both have the same voltage and frequency ranges: 200 to 240VAC voltage and 50/60Hz. This voltage and frequency may be permitted to expand to 170 to 264VAC and a wavering frequency of -5% to +5%. The MR-J4-350B’s rated output current is 17A.

There are number of servo motors that are compatible with the MR-J4-350B servo amplifier. It may harmonize with seven different rotary servo motors, four disparate linear servo motors, and three discrete direct drive motors.

The MR-J4-350B servo amplifier may connect with a servo motor by two cables. The first cable, the encoder cable, can attach to the CN2 connector, linking the amplifier to the encoder of the servo motor used; the second cable, the servo motor power cable may connect to the ‘U, V, W’ terminals. The MR-J4-350B can connect to a like module by the CN1B connector and a SSCNET III cable, putting both modules into the SSCNET II/H system. The servo amplifier can also append to the SSCNET III/H system controller by using the same cable to one of the ports. With the CN5 connector, the MR-J4-350B can attach to a USB connector. The USB utilized is the MR-J3USBCBL3M cable, permitting the interlinkage with a PC. Then, the CN8 connector may link with the MR-J3-D05, which is a safety logic module. The cable that must be used to concatenate the servo amplifier to the module is the MR-D05UDL3M-B cable.

Here is the manual referenced:

Technical Specifications

Part Number: MR-J4-350B (MRJ4350B)
Module Type: Servo Amplifier
Voltage/Frequency: 200 to 240VAC, 3-phase 50/60Hz
Output Wattage: 3.5kW
Weight: 5.07lbs (2.3kg)

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-J4-350B 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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