EZAD-M1 is a digital device for protection and work mode control of AC motors 380 V from the whole variety of powers – 0,5 – 300 kW in the electric drives of pumps ventilators, centrifuges, transport conveyors etc. that work during long or short periods of time. EZAD-M1 realizes an exact thermal model during heating and cooling of the electric motors, which is based on standardized thermal limit curves. There is an LCD display a powerful PIC processor with an in-built ADC and standard interface RS 232 allowing connection to other processing devices.