APPENDIX
App. - 6
(b) Selection example of MCCB and fuse
When a servo amplifier is protected by T class fuses or circuit breaker having an interrupting rating
not less than 300 A effective value and 240 V maximum, use T class fuses or molded-case circuit
breaker (UL489 Listed MCCB) as the following table. The T class fuses and molded-case circuit
breakers in the table are selected examples based on rated I/O of the servo amplifiers. When you
select a smaller capacity servo motor to connect it to the servo amplifier, you can also use smaller
capacity T class fuses or molded-case circuit breaker than ones in the table. For selecting ones
other than Class T fuses and molded-case circuit breakers below, refer to section 11.10.
1) 200 V class
Servo amplifier Molded-case circuit breaker (240 V AC) Fuse (300 V)
MR-J4-10_/MR-J4-20_/MR-J4-40_/MR-J4-60_/MR-J4-70_/
MR-J4W2-22B
NF50-SVFU-5A (50 A frame 5 A) 10 A
MR-J4-60_ (Note)/MR-J4-70_ (Note)/MR-J4-100_/
MR-J4W2-22B (Note)/MR-J4W2-44B/MR-J4W2-77B/
MR-J4W3-222B/MR-J4W3-444B
NF50-SVFU-10A (50 A frame 10 A) 15 A
MR-J4-200_/MR-J4W2-44B (Note)/MR-J4W2-1010B NF50-SVFU-15A (50 A frame 15 A) 30 A
MR-J4-350_/MR-J4W2-77B (Note)/MR-J4W3-444B (Note) NF50-SVFU-20A (50 A frame 20 A) 40 A
MR-J4-500_ NF50-SVFU-30A (50 A frame 30 A) 60 A
MR-J4-700_ NF50-SVFU-40A (50 A frame 40 A) 80 A
MR-J4-11K_ NF100-CVFU-60A (100 A frame 60 A) 125 A
MR-J4-15K_ NF100-CVFU-80A (100 A frame 80 A) 150 A
MR-J4-22K_ NF225-CWU-125A (225 A frame 125 A) 300 A
Note. For 1-phase 200 V AC power input
2) 400 V class
Servo amplifier Molded-case circuit breaker (480 V AC) Fuse (600 V)
MR-J4-60_4 NF100-HRU-5A (100 A frame 5 A) 10 A
MR-J4-100_4 NF100-HRU-5A (100 A frame 5 A) 10 A
MR-J4-200_4 NF100-HRU-10A (100 A frame 10 A) 15 A
MR-J4-350_4 NF100-HRU-10A (100 A frame 10 A) 20 A
MR-J4-500_4 NF100-HRU-15A (100 A frame 15 A) 30 A
MR-J4-700_4 NF100-HRU-20A (100 A frame 20 A) 40 A
MR-J4-11K_4 NF100-HRU-30A (100 A frame 30 A) 60 A
MR-J4-15K_4 NF100-HRU-40A (100 A frame 40 A) 80 A
MR-J4-22K_4 NF100-HRU-60A (100 A frame 60 A) 125 A
(c) Power supply
This servo amplifier can be supplied from star-connected supply with grounded neutral point of
overvoltage category III set forth in IEC/EN 60664-1. However, when you use the neutral point for
single phase supply, a reinforced insulating transformer is required in the power input section. For
the interface power supply, use an external 24 V DC power supply with reinforced insulation on I/O
terminals.
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