This specification covers four series of electrical connectors (plugs and receptacles) with removable crimp contacts and accessories (see 6.1). AS81511 connectors are not recommended for new design. All AS81511 detail sheets that specified class D and/or H have been cancelled without replacement, therefore all class D and H requirements have been deleted from this specification. Electrical, mechanical and environmental features of these connectors include: a Environment resisting at sea level and high altitude. b Quick disconnect. c RFI/EMI (Radio Frequency Interference/Electromagnetic Interference) protection (includes shell to shell grounding spring members). d High density insert arrangements. e Low level circuit capabilities. f Scoop-proof. g Fluid resistant class provided. h High temperature class provided. i Several voltage service ratings available. j Individual contact release from the rear of the connector (series 3 and 4 only).