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Double insulation for MCCB

A Class II or double insulated electrical appliance is one which has been designed in such a way that it does not require a safety connection to electrical earth (ground). 

All Compact NSX, NT/NW/NS circuit breakers are class II front face devices. They may be installed through the door of class II switchboards (as per IEC standards) without downgrading switchboard insulation. There is no other certificate available for it as this is already mentioned in the catalog showing the same. You can refer the same, 
So a class II product complies with the double insulation connection as per the IEC standards 61140 and 60664-1 specification. 

 
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