The 0.118" (3.00 mm) post length is enough for a 1.6 mm board with a through-hole solder fillet. The board guide and keying slot prevent misalignment during assembly — the keying slot also prevents mating the wrong receptacle in a multi-connector panel, a common field-service error. Insulation height of 0.445" (11.30 mm) means the header stands tall above the board — plan for clearance under any adjacent components or enclosure lids.
ROHS3 compliant. Bulk packaging — the header ships in tubes or bags, not tape and reel, so it feeds a hand-insertion or selective-solder line, not a high-speed pick-and-place.
The closest functional alternative in the ledger is the 1-2232960-3 — also a 3-position, 2.50 mm pitch shrouded header, but with a locking ramp instead of a latch holder and rated 2 A (vs. gauge-dependent current on the 3-1871843-3).