The Molex 430451029 is the 10-circuit member of the Micro-Fit 3.0 43045 series — a dual-row, vertical, through-hole header with a 3.00 mm pitch. It's built for board-to-wire power distribution in automotive, industrial, medical, and telecom gear, carrying 8 A per circuit at 600 V. The 30 µin gold on the mating surface handles repeated connect/disconnect cycles without fretting, and the 4-wall shrouding protects the square male pins during handling and guides the receptacle home.
Mates with the matching Micro-Fit 3.0 receptacle housing (e.g. 43025 series) loaded with the appropriate crimp terminals. The locking ramp gives an audible click when fully seated — you'll feel it latch. On site, that ramp is what keeps the connection from backing out under vibration; if you're re-pinning a harness, the terminals are field-serviceable with the standard Molex hand tool.
The 8 A per circuit rating at 600 V means this header carries real power — it's sized for the main DC rail or a motor feed, not a signal line. Derate above the ambient temperature the harness sees.