What this part is
The Molex 430452029 is the 20-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, 3.00 mm pitch board-to-wire header designed for through-hole vertical mating. All 20 positions are loaded. The connector ships in tray packaging.
Ratings that drive the fit decision
At 8 A per circuit and 600 V the 430452029 sits above many mid-power Micro-Fit 3.0 variants — the current headroom is meaningful for automotive and industrial power nodes where the circuit count itself is the primary BOM constraint. The contact finish split is what determines how to assign it: gold plating on the mating face (30.0 µin / 0.76 µm,) gives wear resistance for repeated matings; thick tin on the solder tail (100.0 µin / 2.54 µm,) governs solderability and shelf stability. The -40°C to 105°C operating range covers the full automotive and industrial envelope without derating caveats at the rating boundary.
Mechanical retention for the board and the harness
The locking ramp on the header body — not a friction-latch — holds the mated pair against vibration; the 4-wall shroud keeps the housing seated during cable dress. The integrated board guide aligns the housing during blind mating and prevents lateral drift of the housing relative to the header pins during assembly. For the field service technician this stack means the connection resists accidental unmating without requiring tool actuation on every service event.
Where this class of connector is used
Micro-Fit 3.0 headers are the board-side half of a board-to-wire power interconnect — they mate with the matching receptacle housing. The series appears across automotive harness junctions, industrial automation node modules, medical device power rails, and telecom rack equipment. The UL94 V-0 flammability rating is the compliance gate for equipment enclosures in most of those markets.
Sourcing and compliance posture
The 430452029 is Active and ROHS3 Compliant. It carries a tray package — important for high-volume panel assembly where reel-fed placement is not viable. No official L* successor is listed; the base product number 043045 is the series anchor for a pin-compatible search if sourcing tightens. Quoted to order against BOM quantity; confirm the mating half (the matching Micro-Fit 3.0 receptacle housing) is specified in the same BOM line before committing.