English to Greek Tech/Engineering Telecom(munications) telecommunications

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"The overcurrent relay is located in the switch box of the unit and protects the compressor motor in case of overload, phase failure or too low voltage. The relay is factory-set and may not be adjusted. When activated, the overcurrent relay has to be reset in the switch box and the controller needs to be reset manually"

I translated the "compressor motor" as "μηχανοκίνητος συμπιεστής"
How you would translate it?