A cover for covering electric or electronic components positioned on a board or plate. The cover has a first part attached to the board or plate and a second part, which is detachably attached to the first part. The second part has a lid part and one or more side parts. The attachment comprises a number of elements which are rotatable from an engagement position with the first part to a free position, where the rotation is performed around an axis positioned farther from the lid portion than the actual element so that the lid part and side part(s) are not deformed unnecessarily in order for the second part to be reusable.