The series consists of a N (Normal) version complying to ISO 1724, which is generally used for standard applications, and a S (Supplementary) version complying to ISO 3732 to be used for additional connections. The S version can easily be recognized by its white coloring and by the different order of the contacts, thus preventing an incorrect connection to the N version.Littelfuse supplies these connectors in plastic body with screw and flat terminals. Included in the series of plugs are special versions with clip-plug: 00511700 - 00511900 - 00512700. Standards: Conforms to ISO 1724 & ISO 3732 recommendations and standards Accepts all 7-pole sockets that conform to ISO 1724 & ISO 3732 Screw terminal versions are mainly intended for the replacement aftermarket Flat terminal versions are generally preferred by OEM harness manufacturers.