What it is
The Molex 430450414 is the 4-circuit member of the Micro-Fit 3.0 43045 series — a dual-row 3.00 mm pitch header designed for board-to-cable interconnect in harness assemblies. The four positions are fully loaded, the mating interface carries gold plating (30.0 µin / 0.76 µm) over brass, and the solder tails are thick tin (100.0 µin / 2.54 µm). Rated 8 A per contact at up to 600 V, with a four-wall shroud and locking ramp for positive retention during vibration.
What the ratings mean
The 8 A per circuit rating is the headline figure, but the contact finish grades split the decision: gold on the mating side (30.0 µin) supports repeated cycling and maintains low contact resistance on first mate, while the 100.0 µin tin on the solder tail gives strong solderability and corrosion resistance at the PCB interface. The 600 V rating puts this header in AC power distribution territory — the LCP glass-filled body carries a UL94 V-0 flammability rating, so it is acceptable in equipment enclosures where flame propagation is controlled. The four-wall shroud and locking ramp are the mechanical keying and retention features for the harness side — the board guide ribs on the header body help align the mated housing during assembly. The 0.390 in (9.91 mm) insulation height and 0.125 in (3.18 mm) tail length are the stack-up dimensions the layout engineer routes into the PCB keep-out.
Where this class is used
Micro-Fit 3.0 headers appear in wire-to-board power interconnects across automotive control modules, industrial automation I/O blocks, medical equipment power rails, and telecom rack hardware — applications where the 600 V rating and the 8 A per circuit headroom matter more than high-speed signaling. The board-to-cable orientation means this is the PCB-mounted half of a harness pair; the matching Micro-Fit 3.0 receptacle housing and crimp terminal make up the cable side.