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I have an incoming breaker IK60, with DomaE outgoing miniatures; at a short circuit level, the main breaker tripped.

There is no total/partial discrimination/selectivity between the IK60 and Domae range. 
For a perfect combination you have to refer the tables given in the Complimentary Technical Information guide and follow the rules governing the discrimination of upstream and downstream breakers and select accordingly :

 
 
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