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3
Selection and application
3-11 Protecting inverter circuits using MCCBs
Rated voltage
Motor
output
(kW)
Full load
current
(A)
MCCB rated current (A)
With DC
reactor
Without DC
reactor
200V AC
3-phase
0.1
0.68
5
5
0.2
1.3
0.4
2.3
0.75
3.5
10
1.5
6.9
10
15
2.2
9.5
20
3.7
15.5
20
30
5.5
21
30
50
7.5
27.5
40
75
11
40
50
100
15
54
75
125
18.5
68
100
150
22
84
175
30
116
150
200
37
137
175
250
45
166
200
300
55
200
250
350
75
272
350
-
90
332
400
110
380
500
Note: *1 U
Rated voltage
Motor
output
(kW)
Full load
current
(A)
MCCB rated current (A)
With DC
reactor
Without DC
reactor
400V AC
3-phase
0.4
1.15
5
5
0.75
1.8
1.5
3.5
10
2.2
4.8
15
3.7
7.8
10
20
5.5
10.5
15
30
7.5
13.5
20
40
11
20
30
50
15
27
40
60
18.5
34
75
22
42
50
100
30
58
75
125
37
69
100
45
83
150
55
100
125
200
75
136
175
-
90
166
200
110
190
250
132
225
300
160
273
350
200
342
500
220
376
280
600
315
800
355
400
1200
450
500
Note: For the MCCB types, the rated current values recommended for 50˚C or lower
panel inside temperature are shown. Select an actual type according to the
facility short-circuit interrupting capacity.
3-11 Protecting inverter circuits using MCCBs
3-11-1 Inverter circuits
Inverters usually rely on internal overcurrent protection. Therefore,
the MCCB must protect the system up to the power supply
terminal for the main circuit and must not inadvertently trip while
the inverter is operating normally.
