The Molex 430451227 is a 12-circuit member of the Micro-Fit 3.0 43045 series, a board-to-wire header designed for power distribution in automotive, industrial, medical, and telecom equipment. The through-hole, shrouded design with a locking ramp gives positive retention in high-vibration environments — the latch audibly clicks when fully mated, so a field technician knows the connection is secure.
The 8 A per circuit rating is the headline current for power duty — this is a power header, not a signal-only part, and the tin-plated contacts (60.0 µin on the mating surface) are rated for the full 8 A at the stated operating temperature range of -40 °C to 105 °C. The 3.00 mm pitch and 0.118" row spacing define the PCB footprint: a dual-row layout with 3.00 mm between centres in each row and between rows, which is standard for the Micro-Fit 3.0 family. The 0.125" solder-post length suits a typical 1.6 mm PCB thickness; the 0.390" insulation height above the board gives clearance for the mating receptacle's latch.