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In fact ,for the IT system,there is the problem of breaking capacity with one pole,which exists in the case of a double s.c. fault,while the design softwares can not manage completely.
As a conclusion ,the breaking capacity /1 pole of the breaker should be at least equal to 25% of the IK3 of the installation (for ICC>10KA)
In this case,we can use NW10H2 or NT10H1,attached ASEFA certificates which validate their usage in IT 690V