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A customer wants to install a breaker with a nominal voltage at 725V + 6% is it possible for NS range According to 769 V

A customer wants to install a breaker with a nominal voltage at 725V + 6% is it possible for NS range According to 769 V (I speak about AC voltage not DC !!).
So concerning 769 Vac we are at +11% of the maximum voltage of our standard offer (690 Vca).
According to the IEC's standard we perform 690V + 10%; 1% more will not cause damage on the MCCB.
The real question if as follow : Do you have a lot of margin regarding the Isc (I short circuit) and the Icu given in the NS catalog ? For exemple a NS400N at 660/690V have a Icu = 10 kA if you have Isc = 10 kA it might be a risky situation, so you must choose a NS400H. You can keep in mind that Icu > Isc + 20%
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