The present invention relates to an electrical plug-in connector (1) in particular for high-voltage connections, comprising an outer body (2) having a plug opening (5) for receiving a mating plug-in connector (101), a terminal housing (8, 8′, 8″, 13, 13′, 13″, 13′″) for fastening an electrical contact (36), and a finger protection member (25) projecting into the plug-in direction (X) towards the plug opening (5). Further, the present invention relates to a finger protection member (25) for an electrical high-voltage plug-in connector (1), with a bar-shaped body having a protection end (56), and to a construction kit for a high-voltage electrical plug-in connector (1), comprising an outer body (2) with a plug opening (5) for receiving a mating plug-in connector (101), and at least one terminal housing (8, 8′, 8″, 13, 13′, 13″, 13′″) for fastening an electrical contact (36). Finally, the present invention relates to a method for assembling a plug-in connector (1), in particular for high-voltage connections, wherein a terminal housing (8, 8′, 8″, 13, 13′, 3″, 13′″) of the plug-in connector (1) is inserted into an outer body (2) of the plug-in connector (1) having a plug opening (5) which opens towards a plug-in direction (X) of the plug-in connector (1). In order to provide a plug-in connector (1) which is more plug-compatible than 1 known connectors with a finger protection device (25), yet user friendly, the present invention provides that the finger protection member (25) is a separate piece engaged with the terminal housing (8, 8′, 8″, 13, 13′, 13″, 13′″).