The 48S3.25HEW from Calex Manufacturing is a DC to DC Converter with Input Voltage 18 to 75 V, Output Voltage 1 3.3 V, Output Current 1 25 A, Output Power 100 W, Isolation Voltage 0.7 kV. Tags: PCB Mount, Buck/Step down. More details for 48S3.25HEW can be seen below.