Device for fixing solar panels on a support rail, comprising: - at least one fastening element, in particular at least one spacer, which fastening element comprises at a first end at least one coupling element arranged for coupling the fastening element on a support rail, in particular a support rail for solar panels, and - at least one clamping element coupled with at least one fastening element and provided with at least one first clamping zone, wherein the clamping element is positioned at a second end, opposite from the first end, of the fastening element, - a locking arm connected to the clamping element at a distance from the first clamping zone, wherein the locking arm extends from the clamping element in the direction of the first end of the fastening element, wherein at least a part of the locking arm and at least a part of the first clamping zone of the clamping element can be positioned on either side of the fastening element, such that the first clamping zone is arranged to clampingly fasten at least one solar panel on the support rail, and such that the locking arm and the fastening element mutually enclose a receiving space for the secured reception of at least a part of a shielding element shielding the fastening element, and - at least one shielding element, wherein at least a part of the shielding element is arranged to be received in a secured manner in the receiving space enclosed by the fastening element and the locking arm, and wherein the shielding element is arranged for shielding at least a part of the fastening element, wherein the locking arm is, on a side facing toward the fastening element, provided with at least one first securing element for securing the shielding element in the receiving space, wherein the first securing element is formed by a securing tooth or a toothed profile. - at least one fastening element, in particular at least one spacer, which fastening element comprises at a first end at least one coupling element arranged for coupling the fastening element on a support rail, in particular a support rail for solar panels, and - at least one clamping element coupled with at least one fastening element and provided with at least one first clamping zone, wherein the clamping element is positioned at a second end, opposite from the first end, of the fastening element, - a locking arm connected to the clamping element at a distance from the first clamping zone, wherein the locking arm extends from the clamping element in the direction of the first end of the fastening element, wherein at least a part of the locking arm and at least a part of the first clamping zone of the clamping element can be positioned on either side of the fastening element, such that the first clamping zone is arranged to clampingly fasten at least one solar panel on the support rail, and such that the locking arm and the fastening element mutually enclose a receiving space for the secured reception of at least a part of a shielding element shielding the fastening element, and - at least one shielding element, wherein at least a part of the shielding element is arranged to be received in a secured manner in the receiving space enclosed by the fastening element and the locking arm, and wherein the shielding element is arranged for shielding at least a part of the fastening element,