What this header is
The Molex 430450821 is the 8-position member of the Micro-Fit 3.0 43045 series — a dual-row 0.118-inch (3.00 mm) pitch header with a four-wall shroud and board-lock feature. Tin-plated brass contacts carry 8 A per circuit at up to 600 V; the 60.0 µin (1.52 µm) mating-end plating is standard tin, consistent with the full series.
What the ratings mean for the fit
8 A per circuit at 600 V makes this suitable for low-level power distribution in addition to signal — the 8 A rating is per contact, not a derated shared bus figure, so each circuit independently carries its full 8 A up to the housing's thermal limit. The 3.00 mm pitch matches the standard Micro-Fit footprint; the board-lock feature independently stakes the header to the PCB during wave or reflow soldering and resists peel stress once mated — important in vibrating harness environments. The 0.290 inch (7.37 mm) insulation height sets the minimum standoff above the board surface and must clear any under-board componentry. Square post geometry accepts the matching Micro-Fit 3.0 crimp receptacle; the locking ramp on the shroud audibly snaps the pair together and resists accidental pull-off.
Where this class is used
The Micro-Fit 3.0 series is a mid-density board-to-cable power-and-signal interconnect used across automotive harness modules, industrial automation controllers, and medical equipment panels. The 430450821 specifically is a panel-mount header (right-angle, through-hole) — the in-harness half that receives the matching free-hanging receptacle from the wire side. The UL94 V-0 LCP housing and the -40 to 105 °C operating range cover the thermal extremes of engine-compartment-adjacent and industrial floor equipment.