TEP 100-4812WIR - 

Traco 100W Single Output Regulated Isolated DC-DC Converter - TEP-100WIR Series
The Tracopower TEP 100WIR series is a family of 100W single output, regulated, isolated, high performance DC-DC converters in a rugged, sealed industry standard half brick package. These railway approved DC-DC converters have a high efficiency of up to 92%, allowing an operating temperature up to 60°C with natural convection cooling; which can be increased up to 70°C with heatsink or up to 85°C if mounted on an iron base plate. The TEP 100WIR series of DC-DC converters feature a very wide input voltage range and reverse input voltage, which makes them an interesting solution for battery operated systems. Ideal applications for these single output, regulated, isolated, high performance dc-dc converters are in Telecom/Datacom, industry control and Railway systems for on board power distribution.