6RY1803-0DA04 is a Siemens L04 power-interface spare assembly supplied with terminals and identified with printed-board designation C98043-A7105-L4. It is a service component for the corresponding SINAMICS DCM converter hardware.

Siemens lists the article at end of product lifecycle and names 6RY1803-1DA04 as the successor. The successor uses C98043-A7106-L4 and adds a Functional Safety designation, so the old and new boards must not be treated as identical labels.

• Provides the L04 power-interface path between DCM control electronics and the assigned power section.
• Includes the terminal-equipped hardware scope defined by the Siemens spare article.
• Supports controlled service replacement when the original converter and option assignment are documented.

• Compare the old and successor board labels, functional-safety context, terminals and converter release before substitution.
• Make the converter electrically safe and record every connector, terminal and earth connection before removal.
• Maintain the approved clearance, mounting and cable-routing arrangement when installing the service assembly.
• Complete the required diagnostics and protective-function validation before enabling production operation.

• Service of an installed SINAMICS DCM L04 power interface
• Like-for-like replacement where the original assembly remains available
• Engineered transition to 6RY1803-1DA04 and its newer PCB execution