The through-hole solder termination and 0.120" (3.05mm) post length suit it for PCB stacking or wire-wrap backplane layouts where the full 1.040" (26.42mm) overall contact length provides clearance through multiple board layers.
Rated 5A per contact at 110V, the current capacity is typical for a 0.100" pitch header — the 30.0µin (0.76µm) gold plating on the mating surface is what governs the real duty cycle here. That gold thickness supports repeated mating in test fixtures or programming stations where tin-plated contacts would wear through after a few hundred cycles.