Mitsubishi Electric MELSERVO-J3 Series Handbook page 251

Part 5: Review on Replacement of MR-J3-DU_ with MR-J4-DU_
(2) For control circuit power supply
When the wiring for the control circuit power supply (L11/L21) is thinner than that for the main circuit
power supply (L1/L2/L3), install an overcurrent protection device (molded-case circuit breaker or fuse) to
protect the branch circuit.
(a) Converter unit
Converter unit
MR-CR55K
MR-CR55K4
Note. When having the converter unit comply with the IEC/EN/UL/CSA standard, refer to "MR-CV_/MR-CR55K_/MR-J4-DU_(-
RJ) instruction manual".
(b) Drive unit
Drive unit
MR-J4-DU30K_
MR-J4-DU37K_
MR-J4-DU30K_4
MR-J4-DU37K_4
MR-J4-DU45K_4
MR-J4-DU55K_4
Note. When having the drive unit comply with the IEC/EN/UL/CSA standard, refer to "MR-CV_/MR-CR55K_/MR-J4-DU_(-RJ)
instruction manual".
Molded-case circuit breaker (Note)
Frame, rated current Voltage AC [V]
30 A frame 5 A
30 A frame 5 A
Molded-case circuit breaker (Note)
Frame, rated current Voltage AC [V]
30 A frame 5 A
30 A frame 5 A
Fuse (Class T)
Current [A] Voltage AC [V]
240 1
480 1
Fuse (Class T)
Current [A] Voltage AC [V]
240 1
480 1
5 - 56
Fuse (Class K5)
Current [A] Voltage AC [V]
300 1
600 1
Fuse (Class K5)
Current [A] Voltage AC [V]
300 1
600 1
250
600
250
600