What this header is
The Molex 430452012 is the 20-circuit, dual-row member of the Micro-Fit 3.0 43045 series — a 3.00 mm pitch, through-hole header with a 4-wall shroud, locking ramp, and a board guide feature on the solder side. The 600 V rating opens the part for industrial power distribution and lighting control — applications where circuit voltage, not current, is the governing constraint. Contact finish is tin on both the mating interface and the solder tail, at 100.0 µin (2.54 µm) on the mating side — a heavier tin deposit than many tin-graded peers in the same series, which reduces whisker risk in sustained high-temperature operation up to 105 °C.
Mechanical fit — what the shrouding and locking ramp do
The 4-wall shroud encloses three sides of the contact array and the locking ramp engages the matching receptacle housing at a defined snap-in point, resisting vibration disconnection in industrial and automotive environments without a secondary jack-screw. The board guide feature — alignment fins on the solder side — guides the header into the PCB during through-hole placement and resists lateral shift before the solder reflow sets; it is particularly useful in multi-connector board stacks where connectors are loaded in sequence. Insulation height is 0.390" (9.91 mm) and the post length is 0.125" (3.18 mm) — check the board thickness and solder mask opening against your layout before committing; the kinked pin is a press-fit retention feature on the solder side that limits drop-in compatibility with some socket patterns.
Where the class is used
The Micro-Fit 3.0 series is a board-to-wire power interconnect in harness assemblies across industrial automation, automotive, medical equipment, and telecom infrastructure, with a 600 V rating extending its reach into AC power distribution.
Lifecycle and sourcing
The 430452012 is Active and ROHS3 Compliant. No official successor or cross-reference appears in the lifecycle record. The Micro-Fit 3.0 43045 family is widely second-sourced — if a provable cross-reference is needed, query the RFQ with your alternate-mfr requirement.