Has low ATPase activity. The SufBCD complex acts synergistically with SufE to stimulate the cysteine desulfurase activity of SufS. The SufBCD complex contributes to the assembly or repair of oxygen-labile iron-sulfur clusters under oxidative stress. May facilitate iron uptake from extracellular iron chelators under iron limitation. Part of the SufBCD complex that contains SufB, SufC and SufD. Interacts directly with SufB and SufD. Interacts with SufA (PubMed:19810706). Belongs to the ABC transporter superfamily. Ycf16 family.