11. OPTIONS AND AUXILIARY EQUIPMENT 
 
11 -  60 
 
11.10 Molded-case circuit breakers, fuses, magnetic contactors (recommended) 
(1)  For main circuit power supply 
Always use one molded-case circuit breaker and one magnetic contactor with one servo amplifier. When 
using a fuse instead of the molded-case circuit breaker, use the one having the specifications given in 
this section. 
 
Molded-case circuit breaker (Note 1)    Fuse   
Frame, rated current 
Servo amplifier 
Power factor 
improving reactor is 
not used 
Power factor 
improving reactor is 
used 
Voltage AC 
[V] 
Class Current [A] 
Voltage AC 
[V] 
Magnetic 
contactor 
(Note 2) 
MR-J4-10A(-RJ)  30 A frame 5 A  30 A frame 5 A 
MR-J4-20A(-RJ)  30 A frame 5 A  30 A frame 5 A 
10 
MR-J4-40A(-RJ)  30 A frame 10 A  30 A frame 5 A  15 
MR-J4-60A(-RJ)  30 A frame 15 A  30 A frame 10 A 
MR-J4-70A(-RJ)  30 A frame 15 A  30 A frame 10 A 
MR-J4-100A(-RJ)  30 A frame 15 A  30 A frame 10 A 
20 
S-N10 
S-T10 
MR-J4-200A(-RJ)  30 A frame 20 A  30 A frame 20 A  40 
S-N20 
(Note 3) 
S-T21 
MR-J4-350A(-RJ)  30 A frame 30 A  30 A frame 30 A  70 
S-N20 
S-T21 
MR-J4-500A(-RJ)  50 A frame 50 A  50 A frame 50 A  125  S-N35 
MR-J4-700A(-RJ)  100 A frame 75 A  60 A frame 60 A  150 
MR-J4-11KA(-RJ)  100 A frame 100 A  100 A frame 100 A  200 
S-N50 
MR-J4-15KA(-RJ)  125 A frame 125 A  125 A frame 125 A  250  S-N65 
MR-J4-22KA(-RJ)  225 A frame 175 A  225 A frame 175 A 
240 T 
350 
300 
S-N95 
MR-J4-60A4(-RJ)  30 A frame 5 A  30 A frame 5 A  10 
MR-J4-100A4(-RJ)  30 A frame 10 A  30 A frame 5 A  15 
MR-J4-200A4(-RJ)  30 A frame 15 A  30 A frame 10 A  25 
S-N10 
S-T10 
MR-J4-350A4(-RJ)  30 A frame 20 A  30 A frame 15 A  35 
MR-J4-500A4(-RJ)  30 A frame 20 A  30 A frame 20 A  50 
S-N20 
(Note 3) 
S-T21 
MR-J4-700A4(-RJ)  30 A frame 30 A  30 A frame 30 A  65 
S-N20 
S-T21 
MR-J4-11KA4(-RJ)  50 A frame 50 A  50 A frame 50 A  100  S-N25 
MR-J4-15KA4(-RJ)  60 A frame 60 A  60 A frame 60 A  150  S-N35 
MR-J4-22KA4(-RJ)  100 A frame 100 A  100 A frame 100 A 
480 T 
175 
600 
S-N50 
 
Note   1.  When having the servo amplifier comply with the IEC/EN/UL/CSA standard, refer to appendix 4. 
    2.  Use a magnetic contactor with an operation delay time (interval between current being applied to the coil until closure of 
contacts) of 80 ms or less. 
    3.  S-N18 can be used when auxiliary contact is not required.