The 50 V rating keeps it inside the low-voltage DC or AC signal envelope. In a field cabinet with a fan or a machine with moderate shock, the latch prevents the harness from backing off.
The 0.126" (3.20 mm) post length is standard for a 1.6 mm thick PCB — the solder fillet forms on the bottom side without protruding beyond the board. Mated stacking height is 19.2 mm — this is the distance from the top of the PCB to the top of the mated receptacle housing. If your enclosure has a z-height budget under 20 mm above the board, this header fits; anything tighter and you need a lower-profile series. The board guide feature (a raised rib on the housing base) centres the header during placement, reducing skew during reflow or wave soldering. It is a small detail, but on a pick-and-place line it cuts tombstoning risk.
ROHS3 compliant — the part carries the full RoHS exemption-free status for all six substances plus the four phthalates.