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The Premset compact metering unit M06S is integrating CTs with minimum rating is 100A. How to answer if lower ratings are asked, as 50A or less?

The minimum rating of ARC5 CTs embedded in M06S is 100/5 cl.0.2S, because lower ratings were too big to be integrated in compact metering.
But 100/5 cl0.2S means 1% accuracy down to 1A, in accordance with the standards, 
and 0.1% up to 0.1A : far enough to ensure an acceptable accuracy of +/- 1% for metering with electronic meters.
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