NT579 is a microprocessor electronic device designed to integrate the ther- mal control of resin-cast transformers .
The monitoring unit has separated and independent inputs and outputs:
3 3-wire Pt100 inputs for each winding (total 3 inputs)
2 relays for Alarm - Trip signalling
1 FAULT common relay (sensor fault, monitoring unit working anomaly)
1 output for the direct power supply of the fans.