What it is
The Molex 430451226 is the 12-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, shrouded male header designed for board-to-wire applications in industrial and automotive harness assemblies. The 3.00 mm pitch carries a 600V rating, which is meaningfully above typical low-voltage signal-header levels and opens industrial control-bus and power-supply routing that a 250V sibling would not cover. All 12 positions are populated, the housing is UL94 V-0 rated LCP in black, and the insulation stands 0.390 in (9.91 mm) above the board surface when mounted.
8A per circuit — the series ceiling rating
The 8A per contact rating is the top of the Micro-Fit 3.0 range and governs power-distribution or higher-current signal legs in the harness. For a 12-position dual-row layout this means the 430451226 can handle mid-range power segments — instrument clusters, relay coils, actuator feeds — without stepping up to a dedicated power connector family. The per-contact figure, not a derated total, applies here; the circuit count drives how many parallel paths the harness builder routes, not the connector's own current ceiling.
Contact plating: gold on mating, tin on post
Gold at 30.0 µin (0.76 µm) on the mating interface governs reconnection cycle life — this thickness is above the minimum for industrial fretting resistance and handles field-service swaps without replating. Tin at 100.0 µin (2.54 µm) on the solder-post side maximises wetting and joint reliability in through-hole reflow. The asymmetry is intentional: durability where the connector cycles, solderability where it stays fixed. The contact material is brass throughout.