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Selection and application
3-12 MCCBs for high frequency circuits
Table 3-26 MCCBs for 400Hz circuits
Specify 400Hz when ordering an MCCB for a 400Hz circuit.
Frame
size
Type Ic u (k A)
Rated current
(A)
400V AC 230V AC
125AF BW125JAG 30 50
15, 20, 30, 40, 50,
60, 75, 100
BW125RAG 50 100
250AF BW250EAG 18 30 125, 150, 160,
175, 200, 225
BW250JAG 30 50
BW250RAG 50 100
400AF *1 BW400EAG 30 50 250, 300, 350
BW400SAG 36 85
BW400RAG 50 100
Note: *1 Use a load capacity 20 to 30% lower because of the skin effect.
3-12 MCCBs for high frequency circuits
Hydraulic-magnetic type and solid-state trip type MCCBs
cannot be used in 400Hz circuits because their characteristics
would vary considerably.
Since the instantaneous trip current of standard
thermalmagnetic MCCBs models (magnetic element) will
increase by 1.5 to 2.5 times the cataloged value around
400Hz, circuit breakers specially designed for use in 400Hz
circuits should be used (these models are available on
request). Because highcurrent rating MCCB (400AF to 800AF)
generate increased heat due to the skin effect, their load
capacity must be derated 20% to 30%.
Table 3-26 lists some FUJI MCCBs recommended for use in
400Hz circuits.
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