The Molex 1720430402 is a 4-position right-angle male header from the Super Sabre 172043 series. It carries male blades on a single row at 0.295" (7.50 mm) pitch, rated 30 A per circuit at 600 V. That current rating puts it in the power distribution class — think DC bus bars, server PSU outputs, or battery interconnects — not signal duty. The locking ramp and board lock keep the mated pair together in high-shock environments; the finger-proof shroud meets safety requirements for exposed power circuits.
The only meaningful difference between this 4-position header and the 6-position 1720430606 is the circuit count. Pitch, current rating, voltage, contact plating, mounting orientation, board lock, and finger-proof housing are identical. If your BOM calls for 4 circuits, this is the one; if you need 6, grab the 1720430606. No other spec changes — same footprint class, same mating half, same tooling.