Mediates the transport of the dicarboxylates fumarate, malate, and succinate across the cytoplasmic membrane via a Na(+)-electrochemical gradient. Transports 2 Na(+) for each dicarboxylate. The binding of Na(+) at the extracellular surface probably precedes the binding of dicarboxylate, since there is a competitive activation of succinate transport by Na(+) and an uncompetitive nature of succinate on Na(+) affinity. Belongs to the SLC13A/DASS transporter (TC 2.A.47) family. NADC subfamily.