What it is and where the 30A rating lands
The 1720430406: Silver plating at 100µin (2.54µm) — heavier than the typical gold flash on signal connectors — is the series standard for this current class. The thickness resists wear across reconnect cycles and maintains low contact resistance under load, which is what matters at 30A more than the plating alloy itself. The glass-filled LCP housing carries the thermal load: at 30A per circuit through a 4-position header, the per-pin dissipation stays within the material's 125°C operating ceiling, but the board designer needs to verify trace thermal relief under the solder tail for any sustained full-load condition.