The 1658527-4: The blue housing colour is a visual key for the 622 series — not a functional spec, but useful when multiple connector families share a panel.
Cable termination is IDC — the contacts pierce the insulation on the 26-28 AWG stranded or solid conductors as the cover is pressed down. No wire stripping, no crimp tool; the termination force is set by the connector's own tooling. The 26-28 AWG range covers the common ribbon cable gauges for signal-level interconnects (serial data, parallel bus, sensor lines).
Built-In Strain Relief and Keying
The housing includes a feed-through design, a polarizing key, and a strain relief — three features that together prevent mis-mating and protect the termination point from cable pull. The polarizing key ensures the receptacle can only be inserted one way into the matching header, which eliminates the risk of a reversed cable in a daisy-chain or backplane run. The strain relief grips the ribbon cable jacket after termination, transferring tensile load to the housing rather than to the IDC contacts. For a harness that will be routed through a cabinet or flexed during maintenance, that strain relief is the difference between a reliable connection and an intermittent open.