The tin-plated brass contacts are rated 18 A per circuit, which means each blade carries bus-level current for a main DC rail or a power distribution point inside an enclosure. The black PA46 housing carries a board lock for through-hole solder retention and a locking ramp for positive mating with the Sabre receptacle.
The 431606304 shares the same 7.50 mm pitch, 18 A current rating, 600 V rating, tin plating, and board-lock feature as the 5-position 431600105. The only decision-relevant difference is the position count: 4 positions here versus 5 on the 431600105.