It is a board-to-cable/wire interconnect with a 10.16 mm pitch, right-angle through-hole mounting, and tab contacts. The housing is black UL94 V-0 rated polyester, and the assembly includes a board lock and a detent lock for secure mating. Typical applications include general-purpose industrial power distribution and harness assemblies where a high-current, vibration-resistant connection is needed.
The board lock holds the header during reflow and resists shear from cable strain.
How it compares to a same-series sibling
Against the 1-1871673-2, which is also a 4-position, dual-row right-angle header but on a 2.50 mm pitch with tin-plated mating contacts and a 250 VAC/DC rating, the 1-1123309-2 carries a significantly higher current and voltage rating (30 A at 630 V vs. current that varies by wire gauge and 250 V). The 10.16 mm pitch of the 1-1123309-2 requires a larger board footprint, but the gold-plated mating interface (15.0 µin) gives it a higher mating cycle life and better corrosion resistance than the tin-plated sibling. The board lock and detent lock are shared features. The choice between them comes down to power headroom and environmental duty — the 1-1123309-2 is the heavy-duty option.
It is ROHS3 compliant. No official cross-reference or second-source is listed beyond the Dynamic D-5200 series itself.