Bently Nevada 3300/21 is listed as an exact-model reference within the legacy Bently Nevada 3300 rack-based monitoring family. Public manufacturer material confirms the 3300 family as a machinery monitoring and protection platform, but does not identify the /21 unit's exact channel function or electrical configuration.
Baker Hughes classifies the 3300 Monitoring System as Phase 5 obsolete from March 2014. Limited repairs continued only until 2017, when manufacturer repair and replacement support ended. These lifecycle statements apply to the 3300 system family and are not exact technical specifications for 3300/21.
Before ordering or replacing 3300/21, verify the complete front and side nameplate, installed rack generation, system monitor, power supply, backplane, communication architecture, firmware and field wiring. Do not select the unit from photographs alone.