The ABB 2TLA040033R4100 is a JSM D11B ball latch type component, rated 20 A with a NEMA L15-20P plug-mount configuration. The black nylon housing suits panel or enclosure integration where a locking plug connection is needed for a 20 A, 3-phase, 250 VAC circuit (the L15-20P standard).
The plug-mount design and ball latch mechanism indicate this is a connector or interlock component — the latch holds the plug engaged under vibration, common on machine-tool or conveyor line disconnect points. The 3-inch length fits standard panel-mount receptacles.