A busbar adapter is provided with a first contact connection and a second contact connection for connecting two busbars, a fuse unit having a first fuse holder and a second fuse holder, and a housing structure for accommodating the fuse unit and the first and second contact connections. The first and the second fuse holders releasably retain a first and second fuse. A first supply lead of the first fuse and the first contact connection are connected after inserting the first fuse into the first fuse holder. A second supply lead of the second fuse and the second contact connection are connected after inserting the second fuse into the second fuse holder. The housing structure has insulating walls arranged such that a first current path of the first fuse is isolated from a second current path of the second fuse.