A busbar adapter (100, 200) for contacting at least a first and a second busbar, having the following features: at least a first current supply line and a second current supply line; at least a first contact connection and a second contact connection to produce a connection with the at least two busbars; a fuse unit having at least a first fuse holder and a second fuse holder, the first and second fuse holders (151, 152) being designed to hold a first fuse and a second fuse detachably so that, after the first fuse has been inserted into the first fuse holder, the first current supply line and the first contact connection are connected to provide a first current path, and, after the second fuse has been inserted into the second fuse holder, the second current supply line and the second contact connection are connected to provide a second current path; characterised in that the busbar adapter also has the following features: a housing structure (140, 240) for accommodating the fuse unit and the first and second contact connections (121, 122), wherein the housing structure (140, 240) has isolating walls which are designed to isolate the first current path from the second current path, wherein the housing structure has an upper deck element, a lower deck element and a locking device, wherein the locking device is designed to lock the upper deck element and the lower deck element to each other, and wherein the upper deck element is designed to fasten electrical devices thereto, and the lower deck element is designed to provide an electrical connection to the first and second busbars, wherein the busbar adapter also has a mounting rail which is designed to fasten electrical devices to the upper deck element or to the upper deck of the busbar adapter (100, 200) in different positions thereon. at least a first current supply line and a second current supply line; at least a first contact connection and a second contact connection to produce a connection with the at least two busbars; a fuse unit having at least a first fuse holder and a second fuse holder, the first and second fuse holders (151, 152) being designed to hold a first fuse and a second fuse detachably so that, after the first fuse has been inserted into the first fuse holder, the first current supply line and the first contact connection are connected to provide a first current path, and, after the second fuse has been inserted into the second fuse holder, the second current supply line and the second contact connection are connected to provide a second current path; characterised in that the busbar adapter also has the following features: a housing structure (140, 240) for accommodating the fuse unit and the first and second contact connections (121, 122), wherein the housing structure (140, 240) has isolating walls which are designed to isolate the first current path from the second current path, wherein the housing structure has an upper deck element, a lower deck element and a locking device, wherein the locking device is designed to lock the upper deck element and the lower deck element to each other, and wherein the upper deck element is designed to fasten electrical devices thereto, and the lower deck element is designed to provide an electrical connection to the first and second busbars, wherein the busbar adapter also has a mounting rail which is designed to fasten electrical devices to the upper deck element or to the upper deck of the busbar adapter (100, 200) in different positions thereon. a housing structure (140, 240) for accommodating the fuse unit and the first and second contact connections (121, 122), wherein the housing structure (140, 240) has isolating walls which are designed to isolate the first current path from the second current path, wherein the housing structure has an upper deck element, a lower deck element and a locking device, wherein the locking device is designed to lock the upper deck element and the lower deck element to each other, and wherein the upper deck element is designed to fasten electrical devices thereto, and the lower deck element is designed to provide an electrical connection to the first and second busbars, wherein the busbar adapter also has a mounting rail which is designed to fasten electrical devices to the upper deck element or to the upper deck of the busbar adapter (100, 200) in different positions thereon.