What is accuracy of the Rogowski CT's used in the NW breakers?

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The accuracy is not given only for the CT but for the trip unit asociated with the CT : the value announce is 1.5% for Masterpact and micrologic 5.0P, or Micrologic 5.0E for current measuring.

We refer to the standard IEC 61557-12.

Masterpact NW Air Circuit Breaker