Printed circuit board clamping system with flexible adjustment. It can be mounted on a UM-BASIC/PRO 122 profile from Phoenix Contact. Suitable for clamping printed circuit boards of various sizes by means of an interlocking mechanism or a screwed joint. Compatible with printed circuit boards with standard guide in the profile. The set includes a UM-PRO PROFILE with a width of 122 mm and a length of 220 mm, and a device for wall mounting.