Part 8611401 is the Motor Controller U 731. This CT part is for use with the Siemens Definition system. Compatible models include the Somatom Def AS, Somatom Def Edge and Somatom Def Flash. Look below to view the entire list of compatible models. With a DOA rate that’s lower than the OEM’s and 24-hour support, we’re ready to be your trusted partner for all things related to Siemens medical imaging. We’re here to help, call us now.