What is the rated earth fault breaking current (Ief1) for medium voltage switches according to IEC 62271-103?

The rated earth fault breaking current is the maximum earth fault current in the faulted phase that the switch shall be capable of breaking at its rated voltage, when used on a non-effectively earthed neutral system.
NOTE: The maximum earth fault breaking current is 3 times the cable-and line charging current occurring in normal conditions.
This covers the most severe case, which occurs with individually screened cables.

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