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→13.4.2.4 Switching Capacity
====13.4.2.4 Switching Capacity====
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 ''(Table 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>csCS</sub> .