Device adapter MCCB, 3-pole, 250 A, bar center distance 60 mm for 3VA12/20/21/22/52/61/62 241 x 105 mm, contact to the adapter is included. 8US busbar system for the installation of protective devices such as fuse switch disconnectors and circuit breakers - safe, space-saving, clear. The use of the Siemens 8US busbar systems 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 contact ensure economical electrical equipment in today's installation distribution board construction. The assembly takes place on longitudinal beams, the bar spacing is 60 mm. The Siemens 8US busbar systems are characterized above all by: 1. Mechanical fastening and electrical contact 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. Installation time saved and costs reduced thanks to fully assembled consumer branches. 5. High operational reliability thanks to finger-safe cover of the adapters and device carriers. 6. Wide range of usable busbars for easy adaptation to currents up to 1,600 A.