Modular system for electrical printed circuit boards with centering contacts on front elements and separate locating contacts, notably with contact blades in the rack assembly

The invention relates to modular systems that include a rack assembly for inserting electrical printed circuit boards. Such rack assemblies include at least opposite cross-connecting bars made of electrically conductive material, which are covered with guide bars situated opposite each other in pairs. Such rack assemblies thus provide volume elements suited for the insertion of electrical printed circuit boards. Such volume elements are also called mounting sites and are normally arranged parallel side by side. Electrical printed circuit boards can be inserted into such volume elements, which are then also arranged parallel side by side. A rack assembly () includes cross-connecting bars () and guide bars () for printed circuit boards (). These guide bars each include a fixing device () for the placement of a receiving element () which has a contact zone () and is placed into electric contact on a cross-connecting bar. The invention also provides for front elements () having centering contacts () that protrude into, and thereby come into contact with, the contact zone, in a low-ohmic, current-carrying manner, when the front element is set in place. The receiving element preferably has a contact blade () which extends into a guide groove () of the guide bar.