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Is there any derating in the breaking capacity at 400 Hz for IC60 ?

There isn't any derating about breaking capacity performances for use of MCB in 400 Hz network. 
You have only to take into account a derating for magnetic threshold tripping .

Normally that breaking capacity level is enough, because: 
In a 400 Hz network, the short-circuit current is generally weak because the performances of the energy source come from: 
- a static converter 
- an alternator 
 
We consider the Icc, is 4 or 5 times the nominal current of the source, at the maximum. 
 
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