The 0.156" (3.96mm) pitch is the spacing that drives the mating header's PCB layout — wider than 0.100" signal-pitch connectors, which gives more room for power traces and higher current per contact. The 4-position count matches a 2x2 dual-row header footprint. A 6-position sibling like the 1-1644055-3 uses a 0.250" (6.35mm) pitch on the same dual-row format, but the larger pitch means the two are not footprint-compatible — swapping would require a board layout change.
Latch Lock Retention and Free-Hanging Mount
No tools needed for engagement or release — useful for harness assembly and field service. The free-hanging (in-line) mounting means the housing floats in the harness, not panel-mounted, so the latch provides the primary retention against cable pull and vibration.
Temperature Range and Glow Wire Compliance
The Glow Wire Compliant feature means the PA66 material passes the glow-wire ignition test at 850°C per IEC 60695-2-11, a standard requirement for connectors in white goods and HVAC equipment that must self-extinguish under fault conditions.