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The main requirement for low voltage power switches is the withstanding of high short circuit currents. The short circuit switching capacity of power switches is determined in tests according to IEC/EN 60947-2 <xr id="tab:Testing for the Short Circuit Breaking Capacity of Low Voltage Power Switches According to IECEN 60947-2 (Shortened Summary)"/><!--(Tab. 13.3)-->. These test differentiate between the maximum short circuit current switching capacity (ultimate current limit) I<sub>CU</sub> and the operational (or service) short circuit current capacity I<sub>CS</sub> .
Das sichere Beherrschen hoher Kurzschlusströme ist die Hauptaufgabe von
