Short latch lock/eject hooks on both ends engage the matching AMP-Latch receptacle's locking ears — once mated, the pair resists vibration-induced disconnect without additional hardware. The 0.102" (2.60 mm) solder post length is typical for through-hole soldering on a standard 0.062" (1.6 mm) PCB; the square pins provide good solder fillet formation and mechanical retention in the plated hole.
Each contact is rated 1 A at 250 VAC — this is a signal-level current, not a power interconnect.
The part is ROHS3 compliant per TE Connectivity's current material declaration.
The 1761609-3 gives you 10 positions at 0.100" pitch with 30 µin gold mating finish, which matters if you need higher cycle life or a standard 0.100" ribbon footprint. The 1-1871673-2 also uses a detent lock instead of latch/eject hooks, so the mating receptacle and latching style differ.