Welcome to the Amphenol Industrial AT Circular (ATC) J1939 Connector Series product training module. The presentation will introduce the AT Circular connection system. It will cover the features and potential application markets for these connectors and highlight mechanical, material, and electrical characteristics. The tutorial will review the part number information for the parts in the series and present typical applications. The AT Circular Series started as a 9 pin black thermoplastic connector in accordance with the J1939 specification interface. The line has been expanded to include a five and three contact version along with a strain relief option for the nine pin. Two available shell styles are the square flange and jam nut (which is ideal for quick installation by not requiring screws). AT Contact technology is already used successfully at major OEM’s and features machined contacts with both nickel and gold plating.