12-position right-angle pinout and board fit
The 6-102523-0: 12 circuits, single row, all positions loaded. The 0.240" (6.10 mm) mating pin length engages with the receptacle contact beam; the 0.110" (2.79 mm) post length sinks into the board for solder joint formation.
What the tin plating and 3 A rating mean for your assembly
The 3 A per-contact rating is derated from the 30 °C rise limit of the housing; in a 12-position header, total current is limited by the sum of all active circuits and the board trace width.
The 4-wall shroud protects the pins from stubbing during blind mating; the push-pull latch provides retention without a secondary locking mechanism. The 12-position single-row right-angle configuration is specific — a board layout change would be required to substitute a different position count or orientation.