Board footprint and series fit
The 2-644486-9: The 4-wall shrouding protects the square male pins during mating and guides the receptacle into alignment — useful in blind-mate or panel-feed applications where the connector isn't visible during assembly. The friction lock mates with the corresponding MTA-100 receptacle housing, providing positive retention against vibration without requiring a secondary latch.
Current rating and termination
Current rating is listed as varies by wire gauge — in the MTA-100 system, the per-contact limit depends on the crimp terminal and the wire size used in the mating receptacle. The tin-on-tin contact interface is rated for moderate mating cycles — suitable for field-service connections cycled a few times per year, not daily hot-plug duty.