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Why do you have two different ratings of frame in NSX 1P & 3P (in 1P 30Amp & in 3P 32 Amp)?

After reviewing the IEC standards (60947-1 & 60947-2), it was found out that the IEC has no explicit rule for the current ratings of MCCBs. There are only preferred ratings. 30A and 32A both are within the preferred ratings. Therefore the decision of manufacturing MCCBs with ratings of 30A/32A becomes solely a marketing decision
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