My understanding is that most of the Masterdrive products were discontinued a while ago. According to the note below, there isn't a 1:1 migration to the new drive family (SINAMICS), but there's probably something that will do the job. I recommend contacting a Siemens rep if you're interested. If you need spare parts, tech support may still have them available (for a large markup on what they used to be,I'm sure).