The output short-circuit current bearable by the UPS has become the hot topic since 14th February 2016, when amendment A1:2013 to the international standard IEC 62040-1:2008, which regards the general and safety requirements for UPS, came into force. This amendment introduces specific requirements to the UPS output short circuit withstand current. In particular, it forces UPS manufacturers to guarantee a minimum value depending on the UPS rating in order for the UPS to be sold. Aside from the practical implications introduced with this amendment, let’s try to understand what a short circuit current is and why it is so significant.…
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