The 9-146277-0-05: Current rating is 3A per contact.
The insulator is black Liquid Crystal Polymer (LCP) rated UL94 V-0 — the highest vertical burn rating for unattended equipment inside an enclosure. Insulation height is only 0.090" (2.29mm) above the board surface. In a dense layout where components sit close to the header, this low profile avoids interference with adjacent parts or heatsinks.
