This International Standard specifies the dimensions of, and contact allocation tests and requirements for, 7-pole connectors of type 12 N for the electrical connection of towing and towed vehicles with 12 V nominal supply voltage, thus ensuring interchangeability.
NOTE For new developments and where more than 7 poles are required, as an alternative to the use of the 7-pole connector in accordance with this International Standard and ISO 3732, the use of the 13-pole connector in accordance with ISO 11446 [1] may be required.