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Did an install ages back,another company did EICR & C1 Zs on Mccb Square D breaker.
Not got all the details yet but anyone know the Zs acceptable on a 630 A Mccb..
The orig measurement was 0.01 ohms.
 
0.037 seems to be the max. Zs. or 0.029 for SN type.
 
My image is quite old data but probably isn't too dissimilar to newer devices but you need to know the exact mccb frame. If it is adjustable you maybe able to reduce its magnetic tripping providing this does not give rise to nuisance tripping.
 

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