The Molex 431605303 is the 3-position member of the Sabre 43160 series — a single-row, right-angle through-hole header with male power blades. It carries a 18 A per-circuit rating at 600 V, which puts it in the power interconnect class rather than signal duty.
Derate above 75 °C per the product drawing; the PA46 housing is glass-filled for dimensional stability under that load.
The 431603106 is the 6-position version at the same 7.50 mm pitch, same 18 A and 600 V rating, same right-angle orientation and board lock. Everything else — footprint pitch, current headroom, locking ramp, and tin plating thickness — is identical, so the board layout scales linearly with position count.