The 2-2178661-4 is a 4-position, single-row IDC plug from the TE Mark II series. It terminates discrete wires — not ribbon cable — using insulation displacement contacts, so stripping and crimping are eliminated on the assembly line. The 0.197" (5.00mm) pitch gives enough spacing for 300 V to 600 V class wiring in industrial control panels or appliance harnesses. Silver contact finish is standard here, which provides good conductivity but lower mating cycle life than gold — expect it in a semi-permanent or low-cycle-count interconnect rather than a field-service disconnect. The plug is free-hanging (in-line), mates with the matching Mark II header, and uses a latch lock for retention. The closed-end feature means the housing has a solid back wall — no pass-through for wire tails or daisy-chaining. Typical applications are internal power or signal wiring in commercial equipment, vending machines, and HVAC controls where the 5.00mm pitch matches the terminal block spacing.
Procurement Bottom Line
Obsolete part, no direct factory replacement on record. Confirm the mating header part number and wire gauge before the order is placed.