DC-DC Converter
After looking at the various requirements, the Vicor V150B12C250BL DC-DC converter was chosen for its power rating and packaging. One key benefit of the Vicor Mini series is that it has built in support for parallel operation by connecting the PR pins on the DC-DC to each other via transformers.
Fuse
As recommended by Vicor's design guide, a Bussmann PC-Tron 5A fuse will be used on each V+ input.