Siemens AG G85139-E1721-A88 Inverter CPU Board

Siemens AG G85139-E1721-A88 Inverter CPU Board is the central processing unit module used inside Siemens inverter drives, identified by the exact part number G85139-E1721-A88. This compact printed-circuit board handles core control tasks, interfacing with drive electronics and other control boards to execute firmware-driven commands and coordinate inverter operation. In reseller listings it is described as an inverter CPU board (CPU BOARD ASSEMBLY) for Siemens equipment, with occurrences on sources such as Radwell and other electronics marketplaces, underscoring its role as a service part for legacy installations. Because publicly available data on this specific board is limited, exact electrical specifications, connector layouts, voltage ranges, and compatibility depend on the particular Siemens inverter family and firmware revision; verifying with Siemens documentation or a qualified service partner is recommended before ordering. This part fits within Siemens’ modular control approach, enabling targeted CPU-level replacement without replacing the entire drive, which can simplify maintenance and spare-parts planning for established systems that rely on the G85139-E1721-A88 architecture.