What this 2-position header does in the MTA-100 line
The 640452-2 is a 2-position, single-row, unshrouded header from TE's MTA-100 series — a workhorse wire-to-board interconnect at 0.100" (2.54mm) pitch. Rated for 250VAC and a current that varies by wire gauge — the actual ampacity depends on the attached wire size, not the header alone.
This unshrouded header mates with MTA-100 IDC receptacles (e.g., 640550 series) for wire-to-board termination. The through-hole solder posts are 0.140" (3.56mm) long — standard for a 1.6mm PCB. The square male pins accept standard MTA-100 crimp or IDC terminals.