Busbar system, accessory rail center distance 40 mm. Busbar holder 5-pole 12x 5, 15x 5 as end and intermediate holders. The 8US busbar system is designed for the installation of protective devices such as fuse load disconnectors and circuit breakers - safe, space-saving, and clear. The use of Siemens 8US busbar systems offers a variety of options for installing rail-adaptable connection, switching, and installation devices. The space-saving modular design and quick-mount contact ensure economical electrical equipment in today's installation distribution construction. The assembly is done on longitudinal beams, with a rail distance of 60 mm. The Siemens 8US busbar systems are characterized primarily by: 1. Mechanical fastening and electrical contact in one operation. 2. Worldwide approval, allowing for global application in machinery and plant engineering. 3. Easy replacement of individual devices or entire modules.