The Molex 1718500300 is a 3-circuit receptacle housing from the Micro-Fit 3.0 171850 series, designed for wire-to-board power interconnects in harness assemblies.
Terminal Position Assurance (TPA) Lock
The housing includes a Terminal Position Lock (TPA) feature — a secondary retainer that locks each crimped terminal into its cavity after insertion. This prevents back-out under vibration or wire pull, a common failure point in unkeyed housings. No tools needed for mating or unmating in the field.
Stock both halves or neither — an orphan housing with no terminals on the shelf is dead stock.