The Amphenol Air LB SIM (Modular InterconnectIon SySteM) is a Modular, Rectangular, Multicontact, and Multifunctional con- nector. Its available in metallic or composite versions, shielded or not, and qualified according to the EN 4165 spec.It consists of standard or flanged mount receptacles that can be as- sembled side by side on a panel, standard or rack and panel plugs, easily removable click-in modules.- Two shell types are available : 2 modules and 4 modules.- There are two mating types: clicker nut and rack panel plug.When mating the plug to the receptacle, polarization is mechanically ensured by an asymmetrical mounting screw. The coupling screw includes a polarizing system with 6 versions of hexagonal nuts and keys, providing 36 keying combinations.