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IEC Transformer Protection

IEC Transformer Protection

IEC Transformer Protection

(OP)
NEC is very clear about the selection of transformer over current protection. However I am unable to find some guideline for selection of transformer protection in IEC.

I have a 75kVA isolating transformer (400V primary, 400V secondary). In IEC world, can I use 125A breaker on both primary and secondary, or should it be 160A? Thanks for help!

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