Siemens 6ES7405-0KA02-0AA0 Power Supply Module – Obsolete S7-400 Spare Part

Technical Dossier

Product Details And Specifications

Siemens 6ES7405-0KA02-0AA0 Power Supply Module – Obsolete S7-400 Spare Part

The 6ES7405-0KA02-0AA0 is no longer manufactured by Siemens. DriveKNMS holds RFQ-reviewed sourcing status of this module. For plant managers operating aging S7-400 infrastructure, this listing represents a direct path to avoiding that capital expenditure.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The S7-400 platform entered end-of-life phasing beginning in 2020, with Siemens officially discontinuing new hardware orders for many sub-components. The 6ES7405-0KA02-0AA0 power supply is among the modules that can no longer be sourced through standard distribution channels.

Power supply modules are the most failure-prone component in any PLC rack — they operate continuously under thermal and electrical stress, and their electrolytic capacitors degrade over time regardless of load. In an S7-400 system, the PS module is not hot-swappable in most configurations without a controlled shutdown. A failed PS module means the entire rack goes dark.

DriveKNMS specializes in sourcing exactly these components — modules that have left the active supply chain but remain essential to operating assets.

Condition & Reliability Assurance

All obsolete modules supplied by DriveKNMS pass a structured 5-step inspection protocol before dispatch review:

• Step 1 – Visual Inspection: Full external examination for physical damage, burn marks, cracked housings, and connector pin condition. Corroded or bent pins are flagged for rejection.
• Step 2 – Electrolytic Capacitor Assessment: Capacitor aging is the primary failure mode in legacy power supply modules. Each unit is assessed for capacitor bulging, leakage, and ESR deviation. Units with degraded capacitors are either reconditioned with OEM-equivalent components or rejected.
• Step 3 – Firmware Version Verification: Where applicable, firmware or EPROM versions are documented and matched to the customer's existing system revision to prevent compatibility conflicts.
• Step 4 – Functional Power-On Test: Output voltage and current stability are verified under load conditions. Ripple and regulation are checked against published Siemens specifications.
• Step 5 – Anti-Static Packaging & Documentation: Units are packaged in ESD-safe materials with full inspection records. Traceability documentation is provided on request.

Key Features for System Maintenance

• Drop-in replacement: The 6ES7405-0KA02-0AA0 installs directly into any compatible S7-400 rack slot without hardware modification.
• No reprogramming required: The CPU and I/O modules retain their configuration. Replacing the PS module does not affect PLC program memory or data blocks.
• No engineering rework: Field wiring, bus connectors, and rack backplane remain untouched. Swap time for a trained technician is under 30 minutes.
• Avoids system migration cost: Maintaining PS module spares defers the need for a full S7-400 to S7-1500 migration, which typically requires 6–18 months of engineering effort and significant capital outlay.
• Extends asset life by 5–10 years: A proactive spare parts strategy — holding 1–2 PS modules per critical rack — provides a statistically reliable operational buffer for facilities with a defined end-of-life horizon on their automation assets.

Q: Can you source other S7-400 discontinued modules?
A: Yes. DriveKNMS maintains an active sourcing network for the full S7-400 product family, including CPU modules, interface modules, and I/O cards. Submit your BOM for a sourcing assessment.