Mitsubishi Electric MELSERVO-J2S Series Transition Handbook page 199

Part 5: Review on Replacement of MR-J2S-30 kW or Higher Capacity Models 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
Molded-case circuit breaker (Note)
Converter unit
Frame, rated current
MR-CR55K 30 A frame 5 A
MR-CR55K4 30 A frame 5 A
Note. To make a converter unit comply with the IEC/EN/UL/CSA standard, refer to App. 2.
(b) Drive unit
Molded-case circuit breaker (Note)
Drive unit
Frame, rated current
MR-J4-DU30K_
30 A frame 5 A
MR-J4-DU37K_
MR-J4-DU30K_4
MR-J4-DU37K_4
30 A frame 5 A
MR-J4-DU45K_4
MR-J4-DU55K_4
Note. To make a drive unit comply with the IEC/EN/UL/CSA standard, refer to App. 2.
Fuse (Class T)
Voltage AC [V] Current [A]
240 1
480 1
Fuse (Class T)
Voltage AC [V] Current [A]
240 1
480 1
5 - 38
Fuse (Class K5)
Voltage AC [V] Current [A]
300 1
600 1
Fuse (Class K5)
Voltage AC [V] Current [A]
300 1
600 1
Voltage AC [V]
250
600
Voltage AC [V]
250
600