MTA-100 dust cap for 12-circuit headers
The 1-640550-2 is the 12-position closed-end dust cap in TE's MTA-100 connector accessory line, designed to cover unmated headers or receptacles during shipping or storage. It ships in bulk and is ROHS3 compliant, with no secondary latch or terminal contacts — it simply snaps over the mating face to keep debris out.
Not a replacement for a shroud
The 1-640550-2 is a dust cap, not a shroud — the AMPMODU 1-173144-4 is a 34-position shroud in a different series and package, so it does not fit the MTA-100 footprint or position count.