IDC poke-in for 28-31 AWG magnet wire
The 1217234-1 is the Size 2, Style 300 member of TE's Mag-Mate series — an IDC poke-in terminal that terminates 28-31 AWG magnetic wire without stripping or soldering. A locking feature holds the wire in the insulation-displacement slot; the splice stays closed under vibration where a friction-only contact would walk apart.
Size 2 vs 18-20 AWG sibling
The 1217234-1 (Size 2, 28-31 AWG) and the 1394476-1 (Size 2, 18-20 AWG) share the same Mag-Mate Size 2 body but serve different wire gauges — the 1217234-1's IDC slot is sized for fine magnet wire, while the 1394476-1 uses a pin termination for heavier conductors.