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What is the percentage of derating of a circuit breaker in the enclosure having IP 30/ 31/ 43/ 55 (Prisma Plus) and IP 66 for Himel?

You have to follow the temperature derating charts which are provided in the relevant Catalogs of our Circuit Breakers.
For the Masterpact NT/NW we have in the Catalog (page B-15 of 2012 Masterpact Catalog) a chapter explaining the de-rating in switchboards (IP31 and IP54). The values are given for standard IP ratings and we do not have the ratings for IP66 and for this you have to use the temperature derating charts (IP66 is never recommended for indoor applications).

kindly find attached PDF for more info
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