Key ratings and what they mean
The 430452028: Rated 8 A per circuit at up to 600 V — the current rating applies to the contact pair, and the 15.0 µin gold-over-nickel plating on the mating face governs cycle life and signal integrity at that current. The tin finish on the solder-post side (100.0 µin) is optimised for solderability and long-term shelf stability, not for repeated mate/de-mate cycling. If the harness sees frequent field reconnects, the gold-plated mating side preserves contact resistance across those cycles — but the locking ramp is the primary retention feature, not the plating grade. Four-wall shrouding completely encloses the contact rows on all four sides, which is the meaningful distinction from an open-row header in the same series. Combined with the locking ramp, it gives this header mis-mate protection and vibration retention that a bare dual-beam pin header cannot provide. The board guide feature pilots the header into the receptacle during assembly to prevent cocked engagement.
Style and what it mates with
The 430452028 is classified as board-to-cable — the header mounts perpendicular to the board and receives the matching Micro-Fit 3.0 dual-row receptacle housing on the cable side. The mating half is ordered separately; this listing covers the header body only. Confirm the compatible housing before committing to build-to-print — the 20-position receptacle will match the circuit count, pitch, and row spacing exactly. The insulation height is 0.390 inch (9.91 mm) — this is the seated header height above the board surface and sets the keep-out zone for any component placed behind or beside the header on the PCB. Row spacing matches the 3.00 mm pitch at 0.118 inch, so the footprint follows the standard dual-row Micro-Fit 3.0 grid.