The TE Connectivity 1-1971875-4 is a 12-circuit receptacle housing from the Power Triple Lock, High Temp series. The 0.319" (8.10 mm) row spacing keeps the three rows distinct — this is a power-grade grid, not a dense signal array.
This housing ships empty — the listing note says "Contacts Not Included" and it means it. The housing accepts tab-type contacts terminated via crimp, so your harness build requires a separate terminal order and the right crimp tooling. Don't land this housing on a BOM and assume it's a complete connector — the terminals are a separate line item.
The panel mount, snap-in feature means it locks into a rectangular cutout without hardware; the snap fingers hold it in place while you mate the plug side. The 3-row, 12-position layout means the mating plug must also be a 3-row, 12-position member of the same series — position count has to match exactly.
Sourcing Reality: Active Part, But Verified Stock Wins
But active doesn't mean every distributor carries it on the shelf at a consistent price. The Power Triple Lock series is a TE portfolio workhorse, but the 12-circuit 3-row variant sees variable stocking depth depending on the channel. For a BOM commitment, the right move is an RFQ with your target quantity and required date code range — that confirms availability and pricing against the current market, not a stale web price.
How It Differs From the 1-1971875-3
The 1-1971875-3 is the 10-circuit version of this same housing — same 3-row layout, same 6.00 mm pitch, same panel-mount snap-in and latch lock. If your BOM calls for 12 circuits, the -4 is the match; the -3 leaves two positions empty unless you're depopulating the harness intentionally. No other spec difference between them — same material, same temperature range, same mating half family.