Short Circuit - Switchboard kA Rating

Switchboard fault-rating check - Icu (ultimate breaking capacity) ≥ calculated I_k'' with 10 % margin.

Short circuitkASwitchboard

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

I_{cu} \geq 1.1 \cdot I_k''

Symbol	Meaning	Unit
$I_cu$	Ultimate breaking capacity	kA
$I_k''$	Initial symmetrical fault current	kA

Source: IEC 61363 / IEC 60947-2

Switchboard fault-rating check - Icu (ultimate breaking capacity) \u2265 calculated I_k'' with 10 % margin.