Samlex 30A Non-Isolated Step-Down 24VDC-12VDC Converter [SDC-30]30A Non Isolated Step Down 24VDC 12VDC Converter This high efficiency switch mode step down DC DC converter converts an input voltage of 24 VDC nominal (range 20 VDC to 32 VDC) to a highly regulated output voltage of 12 VDC nominal (13. 8 VDC) at 30 Amps. The SDC 30 DC DC converter is non isolated (no galvanic isolation between input and output) and meant for use in negative ground systems. Features include overload, over heating, reverse polarity and