Samlex America 12A Non-Isolated Step-Down 24VDC-12VDC Converter - Heavy Duty Applications. 8 VDC) at 12 Amps. The SDC-15 DC-DC converter is non-isolated (no galvanic isolation between input and output) and meant for use in negative ground systems. Specifications for Samlex America 12A Non-Isolated Step-Down 24VDC-12VDC Converter - Heavy Duty Applications: Manufacturer: Samlex America Color: Black Package Contents: Samlex America 12A Non-Isolated Step-Down 24VDC-12VDC Converter - Heavy Duty Applications Samlex America SDC-15: 12A Non-Isolated Step-Down 24VDC-12VDC Converter - Heavy Duty Applications