Samlex America Non-Isolated Step-Down 24VDC-12VDC Converter 12A. 8 VDC) at 12 Amps. The SDC-12 DC-DC converter is non-isolated (no galvanic isolation between input and output) and meant for use in negative ground systems. Features include short-circuit reverse polarity and over-voltage protection. Specifications for Samlex America 12A Non-Isolated Step-Down 24VDC-12VDC Converter: Manufacturer: Samlex America Color: Black Package Contents: Samlex America 12A Non-Isolated Step-Down 24VDC-12VDC Converter Samlex America SDC-12: Non-Isolated Step-Down 24VDC-12VDC Converter 12A