SB Connectors are available from 50 up to 500A. The SB connectors ar genderless and are both color and mechnanically keyed to prevent cross mating different voltages (flip one 180 degrees and they will mate to each other).  All the connectors are UL rated to 600 volts so the keys and colors are just identifiers to prevent accidents. Contacts are traditionally silver plated to minimize electrical resistance while offering supreme durability and reliability. Popular SB applications include: Electrical Testing Equipment, Commercial Trucking Charger, Automatic Guided Vehicles, UPS, Material Handling, Motive Power and Electric Vehicles.