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The use of Breaker (at the secondry of transformer 630KVA) i.e.1000A,with operating voltage 690V in IT system

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


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