Connection system comprising an adapter element and a component to be connected or connected therewith, wherein the adapter element comprises - at least one plug element for producing an electrical plug connection with a plug component pertaining to the component by moving the plug component relative to the plug element in a designated connection direction and - at least two receiving elements for a respective engagement element pertaining to the component, wherein the receiving elements each form a receptacle with a designated mounting end position for the engagement element, wherein the receptacles are each delimited by a guide surface contrary to the designated connection direction, which guide surface runs curved or obliquely to the designated connection direction at least in one section, and wherein the component comprises - at least one plug component for producing an electrical plug connection with a plug element on the adapter element and - two engagement elements each for engagement in a respective receptacle on the adapter element, characterized in - that a spacing of the engagement elements from one another is variable by means of an adjusting device pertaining to the component, wherein the adjusting device comprises a rotatable shaft and a transmission device for conversion of a rotational movement of the shaft into a linear movement of the engagement elements; - that the receptacle of the receiving elements following the designated connection direction is in each case delimited by a running surface which at least in a partial region runs in a curved manner or obliquely to the designated connection direction; - that the receptacles of the receiving elements each have an inlet opening - and that the receptacles of the receiving elements run from their respective inlet opening to the respective mounting end position. - at least one plug element for producing an electrical plug connection with a plug component pertaining to the component by moving the plug component relative to the plug element in a designated connection direction - at least two receiving elements for a respective engagement element pertaining to the component, wherein the receptacles are each delimited by a guide surface contrary to the designated connection direction, which guide surface runs curved or obliquely to the designated connection direction at least in one section, and wherein the component comprises - at least one plug component for producing an electrical plug connection with a plug element on the adapter element and - two engagement elements each for engagement in a respective receptacle on the adapter element, characterized in - that a spacing of the engagement elements from one another is variable by means of an adjusting device pertaining to the component, wherein the adjusting device comprises a rotatable shaft and a transmission device for conversion of a rotational movement of the shaft into a linear movement of the engagement elements; - that the receptacle of the receiving elements following the designated connection direction is in each case delimited by a running surface which at least in a partial region runs in a curved manner or obliquely to the designated connection direction; - that the receptacles of the receiving elements each have an inlet opening - and that the receptacles of the receiving elements run from their respective inlet opening to the respective mounting end position. - at least one plug component for producing an electrical plug connection with a plug element on the adapter element and - two engagement elements each for engagement in a respective receptacle on the adapter element, - that a spacing of the engagement elements from one another is variable by means of an adjusting device pertaining to the component, wherein the adjusting device comprises a rotatable shaft and a transmission device for conversion of a rotational movement of the shaft into a linear movement of the engagement elements; - that the receptacle of the receiving elements following the designated connection direction is in each case delimited by a running surface which at least in a partial region runs in a curved manner or obliquely to the designated connection direction; - that the receptacles of the receiving elements each have an inlet opening - and that the receptacles of the receiving elements run from their respective inlet opening to the respective mounting end position.