The 18-75C3.3NT1850 from Acopian Technical Company is a DC to DC Converter with Input Voltage 18 to 75 V, Output Voltage 1 3.3 V, Output Current 1 12.9 to 18.5 A, Output Power 288 W, Isolation Voltage 0.3 kV. Tags: DIN Rail Mount, Buck/Step down. More details for 18-75C3.3NT1850 can be seen below.