Standard 10A Swiss adaptor using SN SEV 1011 standard. This is the Type 13 3-pin single-phase plug. Charge at up to 6 mph / 10 km/h.
The Type 23 (16A) and Type 13 (10A) single-phase plugs and sockets look similar except that the 16A version plugs use square pins and the sockets use square holes. The 10A versions have round pins and holes. As a result, you can use the 10A plug (with round pins) in the 16A socket (with square holes), but not the other way around.