SAE J3105 is a recommended practice for automated connection devices (ACD) that mate chargers with battery electric buses and heavy-duty vehicles.

It covers the general physical, electrical, functional, testing, and performance requirements for automated conductive DC power transfer systems intended for heavy duty vehicles, focusing primarily on transit buses.

J3105 defines a common automated conductive charging system architecture so that any vehicle selecting one of the supplemental specific ACD implementations can use any charger that complies with that specific implementation, regardless of manufacturer, similar to how the earlier IEC 62196, SAE J1772, and SAE J3068 standards define the characteristics for a manually-plugged electric vehicle supply equipment interface.

[1] The Task Force first published the SAE J3068 recommended practice in 2018, building on work from existing international standards for charging using three-phase AC power.

Each of the recommended practices for specific ACD implementations includes the conductor dimensions and spacing, and the required alignment and connection procedure.

[8] In the United States, the first OppCharge stations were deployed in 2019 by New Flyer Infrastructure Solutions as on-route chargers for the New York City Transit Authority along its M42 route.

[14] In addition, the Port of Long Beach has announced its intentions to convert an existing fleet of 33 diesel-powered tractors to battery-electric drivetrains, which will include the installation of charging stations.

The blade implementation is slower to engage than the cross rail, but the docking process to mate the vehicle to the charger is more automated.