What mates with this 3.00 mm pitch header
The 4-794638-2: The locking ramp fastening type means the mating half must have a matching ramp feature — standard Micro MATE-N-LOK receptacle housings (like the 794617 series) click into place and resist vibration-induced separation. Rated 250V, with current depending on the wire gauge of the crimp terminal used in the mating half.
Board-fit details for layout
The 0.364" (9.25 mm) insulation height gives clearance for components under the overhang; row spacing is also 3.00 mm, so the footprint is a 3.00 mm square grid.