10.16 mm Pitch, 3-Position, Single-Row — Harness Drop Housing
At 10.16 mm (0.400") pitch, the contacts sit far enough apart that you get generous creepage for higher-voltage runs — this is a power interconnect housing, not a signal-density part. The single-row, free-hanging (in-line) format mates with the matching Dynamic D-5200 plug header, and the polarizing key ensures the connector half goes on one way only, which saves a headache on the assembly line when you're wiring a dozen identical drops. The black colour is the standard for the D-5200 line — no colour-coding for keying here, just the mechanical polarising rib.
The housing accepts the crimp terminals through the rear, and the terminal locks into place with a positive retention latch. For a harness builder, this means you stock the housing and the terminals as separate BOM lines, and you only load the contacts after the wire ends are stripped and crimped.
Polarising Key — One-Way Mate, No Guesswork
The polarising key on the 1-179958-3 is a raised rib inside the housing cavity that mates with a corresponding slot on the plug header. It prevents the connector halves from being plugged in backwards or misaligned — a simple but effective mechanical safeguard. On a 3-position connector it might seem like overkill, but when you're building a harness with several identical-looking drops, that key saves you from a continuity check that finds the power and return swapped.