Connection device for conductors, wherein the connection device has at least the following: a. a plurality of single-conductor terminals (2a, 2b; 3a, 3b, 4a, 4b) which are designed as direct plug-in terminals, for which purpose each of the single-conductor terminals (2a, 2b; 3a, 3b, 4a, 4b) in each case has i. a metallic contact element, in particular a metallic clamping cage (5 or 5'), ii. a spring support (6 or 6') made of a non-conductive material, in particular a non-conductive plastic, iii. as well as a clamping spring, b. a busbar with a main direction of extension, to which the contact element is attached, c. in each case two of the plurality of single-conductor terminals are combined to form double-conductor terminals on the busbar, and in that a plurality of the double-conductor terminals on the busbar are arranged one behind the other in the main direction of extension of the busbar, characterized in that d. the plurality of spring supports (6, 6') made of non-conductive material are each attached to at least one corresponding receiving element made of non-conductive material, e. wherein one or more mounting means for mounting the respective spring support on a respective corresponding receiving element made of non-conductive material is/are formed on the plurality of spring supports made of non-conductive material, and f. wherein the respective receiving element for the respective spring support is in each case a further spring support, or in that the respective receiving element is an intermediate piece which is in each case attached to the at least one of the spring supports and to the respective further one of the spring supports of the respective double-conductor terminals. a. a plurality of single-conductor terminals (2a, 2b; 3a, 3b, 4a, 4b) which are designed as direct plug-in terminals, for which purpose each of the single-conductor terminals (2a, 2b; 3a, 3b, 4a, 4b) in each case has i. a metallic contact element, in particular a metallic clamping cage (5 or 5'), ii. a spring support (6 or 6') made of a non-conductive material, in particular a non-conductive plastic, iii. as well as a clamping spring, i. a metallic contact element, in particular a metallic clamping cage (5 or 5'), ii. a spring support (6 or 6') made of a non-conductive material, in particular a non-conductive plastic, iii. as well as a clamping spring, b. a busbar with a main direction of extension, to which the contact element is attached, c. in each case two of the plurality of single-conductor terminals are combined to form double-conductor terminals on the busbar, and in that a plurality of the double-conductor terminals on the busbar are arranged one behind the other in the main direction of extension of the busbar, characterized in that d. the plurality of spring supports (6, 6') made of non-conductive material are each attached to at least one corresponding receiving element made of non-conductive material, e. wherein one or more mounting means for mounting the respective spring support on a respective corresponding receiving element made of non-conductive material is/are formed on the plurality of spring supports made of non-conductive material, and f. wherein the respective receiving element for the respective spring support is in each case a further spring support, or in that the respective receiving element is an intermediate piece which is in each case attached to the at least one of the spring supports and to the respective further one of the spring supports of the respective double-conductor terminals.