Tin-plated phosphor bronze contacts carry a 5A per-circuit rating at 110V, and the 100.0µin (2.54µm) tin finish on the mating surface handles moderate insertion cycles in a clean indoor environment.
Derate above 25°C per the manufacturer's curve. The 110V rating is the working voltage; it gives enough creepage margin on the 2.54mm pitch for low-voltage power distribution and signal-level circuits, but not for mains-voltage isolation. For a board-edge header that gets mated once or twice in its service life, tin is perfectly adequate; for a field-serviceable connection that cycles regularly, you would want a gold-flashed variant from the same series.