The Molex 0430450428 is a 4-position (2×2), dual-row header from the Micro-Fit 3.0 43045 series, designed for board-to-cable/wire power interconnects. It carries 8 A per circuit at 600 V on a 3.00 mm pitch — the 8 A rating means each contact handles bus-level current, sized for a DC power rail or a moderate load circuit, not a signal line. Gold-plated mating contacts (15.0 µ") resist fretting corrosion over repeated matings; tin-plated solder posts (100.0 µ") wet reliably in wave solder.
Within the Micro-Fit 3.0 43045 header family, the 0430450428 at 4 positions (2×2) is the compact power entry compared to the 16-position 430451610 at the same 3.00 mm pitch. Both carry the same 8 A per circuit and 600 V rating, so the choice comes down to circuit count: the 4-position fits a 2×2 grid for a single power pair or a small load group; the 16-position fills a 2×8 layout for a multi-circuit harness. No pitch or footprint difference — just the position count matching the BOM line.
Mates with the matching Micro-Fit 3.0 receptacle housing (e.g., 43025 series) using the standard crimp terminal. The 4-wall shroud aligns the pair during blind mating.