What is the accuracy class for the CTs built-inside the NSX MCCBs?
CTs we use in Micrologic trip unit of Compact NSX is an air core CT and the accuracy is not linked to the load because the load of the air core CT is always negligible you don't have any risk of saturation of the magnetic material. Air core CT (Rogowski type) is linear and due to its technology the VA rating is very low and the core in the air not saturable at all. By construction, the air core CT cannot meet any saturations. Please have a look at page 96 of the Micrologic 5/6 user guide ref LV434104
For more info about Air core CT => http://en.wikipedia.org/wiki/Rogowski_coil