Fuji Electric EW32EAG - Protecting Inverter Circuits Using Mccbs; Inverter Circuits

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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 50 0
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 4 0
11 20 30 5 0
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 25 0
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.