Answer / omer a.osman

What do you mean by SDF. I guess Star/Delta.
In this case, the starting current will be reduced & within 15 to 20 Sec. the Sytem will changed to Direct on line in running Condition by taking the full load current. Hence, the recommended MCCB rating as protective device to protect the feeders should not be less than the current carrying capacity & tripping current about 1.45In. However, the breaking Capacity of the MCCB is an essential factor.

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