Siemens 6FC5247-0AA00-0AA3 NCU Box

Siemens 6FC5247-0AA00-0AA3 NCU Box is a SINUMERIK 840D/DE enclosure designed to mount the NCU (numerical control unit) modules in a machine's control cabinet. It serves as the mounting housing for NCU components including power supply, battery, and cooling fan, and accepts multiple NCU variants used by SINUMERIK 840D/DE such as NCU 561.2/561.3/561.4 and NCU 571/571.2/571.3/571.4, 572/572.2/572.3, and 573.2/573.3/573.4/573.5, enabling installation of the NCUs with required power and backup. The unit is designed to integrate with the SINUMERIK 840D/DE control architecture and is often used in retrofits or service exchanges where the NCU box handles the brain of the machine's motion control. The enclosure ships with a power unit, a backup battery, and a cooling fan to support installed NCU modules, and is listed as the replacement/assembly for the 6FC5247 series, with compatibility across several NCU generations. Typical applications include CNC machine tools that run SINUMERIK 840D/DE, where the NCU Box houses the NCU electronics and interfaces to drives and PLC logic, consolidating control hardware in a single rugged enclosure.