Various types of adaptors with older system cable and new system micro adapter are available to connect the older 7-pole Normal (N) and Supplementary (S) system to the newest 13-pole system and vice versa. These adapters are used for electrical connections between a vehicle and a trailer or caravan with 12V electrical system. Standards: Conforms to ISO 1124 and ISO 11446 Greater mechanical resistance More reliable and safe electrical connection Nickel-plated brass contacts