Mitsubishi Electric MELSERVO-J3 Series Handbook page 199

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
(2) MR-J4 series
(a) 200 V class
Converter unit
MR-CR55K
(b) 400 V class
Converter unit
MR-CR55K4
Drive unit
1000 r/min series
MR-J4-DU30K_
MR-J4-DU37K_
Drive unit
1000 r/min series
MR-J4-DU30K_4
MR-J4-DU37K_4
MR-J4-DU45K_4
MR-J4-DU55K_4
5 - 4
Servo motor
HG-JR_
1500 r/min series
30K1 30K1M
37K1 37K1M
Servo motor
HG-JR_
1500 r/min series
30K14 30K1M4
37K14 37K1M4
45K1M4
55K1M4