A panel element for use in a modular wall system with vertical support structures, in which at least one of the vertical support structures comprises first and second electrical power supply contacts within said at least one of the vertical support structures and further openings in a surface of the at least one of the vertical support structures, configured to passage of pins to contact the first and second electrical power supply contacts, the panel element comprising - a panel having a planar surface and side edges transverse to the planar surface; - an electrical connector comprising a first connector pin and a connector second pin for forming electrical connections, the first and second connector pins having a cross-section configured to fit within further openings, the connector pins being movably coupled to the panel so as to allow movement of the first and second connector pins in at least one direction parallel to the planar surface, between an extended position and a pulled-in position of the electrical connector, the electrical connector being spring loaded to exert a force towards assumption of the pulled-in position; and - a detent (300, 302) configured to latch the electrical connector with the connector pins in the extended position; wherein the electrical connector comprises a housing within or attached to the panel and characterised in that the electrical connector comprises a movable part that is movable relative to the housing, the first and second connector pins being located on the movable part; and the panel element further comprising a hinge coupling between the housing and the movable part, configured to allow rotation around a rotation axis normal to the back plane of the panel, whereby the first second and connector pins (220a, 220b) are moved in a plane parallel to the back plane of the panel. - a panel having a planar surface and side edges transverse to the planar surface; - an electrical connector comprising a first connector pin and a connector second pin for forming electrical connections, the first and second connector pins having a cross-section configured to fit within further openings, the connector pins being movably coupled to the panel so as to allow movement of the first and second connector pins in at least one direction parallel to the planar surface, between an extended position and a pulled-in position of the electrical connector, the electrical connector being spring loaded to exert a force towards assumption of the pulled-in position; and - a detent (300, 302) configured to latch the electrical connector with the connector pins in the extended position; wherein the electrical connector comprises a housing within or attached to the panel and characterised in that the electrical connector comprises a movable part that is movable relative to the housing, the first and second connector pins being located on the movable part; and the panel element further comprising a hinge coupling between the housing and the movable part, configured to allow rotation around a rotation axis normal to the back plane of the panel, whereby the first second and connector pins (220a, 220b) are moved in a plane parallel to the back plane of the panel. wherein the electrical connector comprises a housing within or attached to the panel and characterised in that the electrical connector comprises a movable part that is movable relative to the housing, the first and second connector pins being located on the movable part; and the panel element further comprising a hinge coupling between the housing and the movable part, configured to allow rotation around a rotation axis normal to the back plane of the panel, whereby the first second and connector pins (220a, 220b) are moved in a plane parallel to the back plane of the panel.