Spanish translation: UPS pequeño/mediano de montaje independiente
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Unidad independiente de Suministro Ininterrumpible de Electricidad
Explanation: No context given, but a UPS is a Uninterruptible Power Supply, a device that keeps your computer running for a while in the case of porwer outages and turns it off correctly if the outage lasts a while. I suggest you do is as follows:
Suministro Ininterrumpible de electricidad (Uninterruptible Power Supply-UPS)
and then just use UPS after that. That´s what I do... good luck
My own daily experience, although UPS could be a number of other things