The TE Connectivity 1-640511-0 is a 9-position receptacle housing from the MR (Miniature Rectangular) series, laid out in 3 rows on a 4.20mm pitch. The panel-mount snap-in fit and latch lock fastening mean it clips into a panel cutout and stays there without a secondary fastener; the latch holds the mating plug against vibration in a harness assembly.
As a receptacle housing, this part accepts male pin contacts and mates with the corresponding MR series plug housing. The latch lock provides the primary retention — a positive snap that resists the road buzz and machine vibration that can walk a friction-only mate apart over time. The 9-position, 3-row layout at 4.20mm pitch means the mating half must match that exact position count and row arrangement.