The Amphenol FCI 87901-128HLF is a 28-position dual-row unshrouded header from the BERGSTIK® II series, on the standard 0.100" (2.54mm) pitch. Rated 5A per circuit at 110V, with 30.0µin (0.76µm) gold plating on the mating surface — the gold thickness supports repeated mating cycles without the contact fretting you would see with tin on a frequently disconnected line.
Within the BERGSTIK® II family, the 28-position 87901-128HLF sits between the 20-position and 36-position variants at the same 0.100" pitch and dual-row layout. The selection decision is purely the circuit count matching the BOM — the footprint, current rating, and plating grade are consistent across the loaded-position range.
Termination is through-hole solder — the 0.120" (3.05mm) post length suits standard PCB thicknesses from 0.062" to 0.093".