Abstract: A plug and receptacle combination having a compact configuration includes a plug having a slot for receiving a raised key-like projection on the receptacle to effect a polarization function and a flush-mount latch co-aligned with the slot to resiliently engage an opening in the projection to releasably latch the plug into engagement with the receptacle. The receptacle is designed to be telescopically received within the end of the plug to provide a high degree of shielding integrity. The plug is assembled from upper and lower half-shells that retain a connection block containing contacts of a first type, and the receptacle is defined by inter-engaging inner and outer shells which retain a connection block containing contacts of a second type for inter-engaging the contacts of the first type. A resilient spring is provided on the receptacle on the side opposite the raised key-like projection to assist in maintaining the plug and receptacle in mechanical and electrical engagement with one another.