Device adapter MCCB, 4-pole, 250 A for 3VA12. Contacting to the adapter is included. Busbar system 8US for the installation of protective devices such as fuse switch disconnectors and circuit breakers - safe, space-saving, clear. The use of the Siemens busbar systems 8US offers a wide range of options for the installation of rail-adaptable connection, switching and installation devices. The space-saving modular design and quick-assembly contacting ensure economical electrical equipment in today's installation distribution board construction. The assembly takes place on longitudinal beams, the rail spacing is 60 mm. The Siemens busbar systems 8US are characterized above all by: 1. Mechanical fastening and electrical contacting in one operation. 2. Worldwide approval and therefore worldwide application possibilities in mechanical and plant engineering. 3. Easy replacement of individual devices or entire combinations. 4. Assembly time saved and costs reduced thanks to fully assembled consumer branches. 5. High operational safety thanks to finger-safe covers for adapters and device carriers. 6. Wide range of usable busbars for easy adaptation to currents up to 1,600 A.