The TSD-50B-12 from Technology Dynamics is a DC to DC Converter with Input Voltage 19 to 36 V, Output Voltage 1 12 V, Output Current 1 4.2 A, Output Power 50 W, Operating Temperature 0 to 55 Degree C. Tags: Rack mount, Buck/Step down. More details for TSD-50B-12 can be seen below.