Plug-in connector element and plug-in connector for high-voltage applications

A plug-in connector, comprising:

• a plug-in connector element including an electrically conductive contact element, a housing, a contact protection element disposed so that, between the housing and the contact protection element, access to the electrically conductive contact element is prevented for an object having a diameter above a defined value, and a temperature sensor accommodated at least in part within the contact protection element and measuring a temperature of the electrically conductive contact element;
• and
• a mating plug-in connector element matable with the plug-in connector element.