S7-400 PLC Power Supply Solution — SIEMENS 6ES7405-0KA02-0AA0 | PS 405 Series
Where This Product Is Used
The SIEMENS 6ES7405-0KA02-0AA0 is a 24 VDC input power supply module designed for the SIMATIC S7-400 programmable logic controller platform. It is deployed across a wide range of demanding industrial environments where stable, regulated DC bus power is critical to system uptime:
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, and engine assembly cells where S7-400 racks govern multi-axis motion and safety interlocks.
- Chemical & Petrochemical Plants: Distributed control system (DCS) hybrid architectures where S7-400 acts as the primary process controller for reactor loops, valve sequencing, and emergency shutdown (ESD) systems.
- Steel & Metals Processing: Rolling mill drives, continuous casting lines, and furnace temperature control panels requiring uninterrupted 5 VDC backplane power.
- Water & Wastewater Treatment: SCADA-integrated pump stations and filtration control panels with 24 VDC field power from existing UPS infrastructure.
- Power Generation & Utilities: Turbine control cabinets and substation automation panels where the S7-400 platform is the backbone of protection relay coordination.
- Pharmaceutical & Food Processing: GMP-compliant production lines requiring validated PLC hardware with traceable sourcing documentation.
- Machine Tool & OEM Equipment: CNC machining centers and special-purpose machines built around the S7-400 rack for high-throughput cycle control.
Technical Specifications
| Part Number | 6ES7405-0KA02-0AA0 |
| Product Family | SIMATIC S7-400, PS 405 |
| Module Type | Power Supply Module (PSU) |
| Input Voltage | 24 VDC (19.2 – 28.8 VDC operating range) |
| Output Voltage | 5 VDC (backplane bus) |
| Output Current | 4 A |
| Output Power | 20 W |
| Backplane Bus | S7-400 central rack / expansion rack |
| Redundancy Support | No (single PS; use 6ES7405-0KA02-0AA0 in parallel for redundant configs) |
| Dimensions (W × H × D) | 25 mm × 290 mm × 210 mm |
| Weight | approx. 180 g |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | −40 °C to +70 °C |
| Relative Humidity | 15 % to 95 %, non-condensing |
| Protection Class | IP 20 |
| Mounting | Slot 1 of UR1 / UR2 / ER1 / ER2 rack |
| MLFB / Order Number | 6ES7405-0KA02-0AA0 |
| Firmware | Not applicable (hardware module) |
Why Engineers Specify This Model
- Compact 25 mm Single-Slot Footprint: Occupies only one slot in the S7-400 rack, preserving maximum I/O capacity in space-constrained cabinets.
- 24 VDC Input Compatibility: Directly powered from standard 24 VDC plant bus or UPS output — no additional AC/DC converter required in the panel.
- Stable 5 VDC / 4 A Backplane Output: Delivers clean, regulated power to the S7-400 CPU and I/O modules, minimizing noise-induced faults in high-EMI environments.
- Proven S7-400 Platform Longevity: The S7-400 series has a decades-long installed base; this PSU is a direct, validated replacement for aging power supplies in legacy systems.
- Diagnostic LED Indicators: Onboard status LEDs provide immediate visual confirmation of power-good state, simplifying commissioning and fault isolation.
- Wide Operating Temperature Range: Rated to 60 °C continuous operation — suitable for non-air-conditioned enclosures in foundry, outdoor, and tropical environments.
- Drop-in Replacement: Mechanically and electrically identical to earlier -0AA0 variants; no rack modification or firmware update required.
Complete System Bill of Materials
The 6ES7405-0KA02-0AA0 is typically ordered alongside the following components to build or restore a complete S7-400 control system:
- Rack: 6ES7400-1JA01-0AA0 (UR1, 18-slot) or 6ES7401-2TA01-0AA0 (ER1, 18-slot expansion)
- CPU: 6ES7412-2XK07-0AB0 (CPU 412-2) / 6ES7414-3XM07-0AB0 (CPU 414-3) / 6ES7416-3XR05-0AB0 (CPU 416-3)
- Digital Input Module: 6ES7421-1BL01-0AA0 (32 × DI, 24 VDC)
- Digital Output Module: 6ES7422-1BL00-0AA0 (32 × DO, 24 VDC / 0.5 A)
- Analog Input Module: 6ES7431-4RD00-0AB0 (8 × AI, ±10 V / 4–20 mA)
- Analog Output Module: 6ES7432-1HF00-0AB0 (8 × AO)
- PROFIBUS DP Interface: 6ES7443-1EX30-0XE0 (CP 443-5 Extended)
- Memory Card: 6ES7952-1KK00-0AA0 (4 MB Flash EPROM)
- Front Connector / Bus Connector: 6ES7390-1AE80-0AA0 (bus connector for UR rack)
Compliance & Industry Standards
- CE Marking: Compliant with EU Low Voltage Directive (LVD) 2014/35/EU and EMC Directive 2014/30/EU.
- UL / cUL Listed: Recognized under UL 508 (Industrial Control Equipment) for North American market installations.
- IEC 61131-2: Meets programmable controller hardware requirements for power supply modules.
- ATEX / IECEx: Standard module is not ATEX-rated; for hazardous area installations, use approved Ex-rated enclosures with this module inside.
- RoHS Compliant: Manufactured in accordance with EU Directive 2011/65/EU on restriction of hazardous substances.
- ISO 9001: Produced under SIEMENS’ ISO 9001-certified manufacturing quality management system.
- REACH: Compliant with EU REACH Regulation (EC) No 1907/2006.
Quality Assurance & Sourcing
At Konmask.com, every SIEMENS automation component is subject to a multi-stage verification process before dispatch:
- Authenticity Verification: Each unit is inspected against SIEMENS’ published physical authentication markers, label formats, and holographic seals.
- Functional Pre-Test: Power supply modules are bench-tested for correct output voltage and current under load prior to packaging.
- Traceability Documentation: Batch records, date codes, and country-of-origin documentation are retained and available upon request for regulated industries.
- Anti-Counterfeit Policy: We do not source from grey-market brokers. All stock is procured through authorized distribution channels or directly from verified OEM surplus.
- Packaging Integrity: Units are shipped in ESD-safe anti-static bags with foam cushioning inside double-wall corrugated cartons.
- Warranty: 12-month replacement warranty against manufacturing defects. Defective units are replaced or refunded — no restocking fees.
How to Source This Part
- Confirm your rack slot availability — verify Slot 1 is free in your UR1/UR2/ER1/ER2 rack before ordering.
- Check input voltage — confirm your panel provides 24 VDC (19.2–28.8 VDC) at the PSU terminal.
- Calculate load budget — sum the 5 VDC current draw of all installed CPU and I/O modules; ensure total does not exceed 4 A.
- Place your order — add to cart and proceed to checkout. We accept T/T bank transfer, PayPal, and major credit cards.
- Request a quote for bulk orders — contact support@konmask.com for volume pricing on 5+ units.
- Expedited shipping available — DHL Express and FedEx International Priority options at checkout for urgent plant shutdowns.
Application-Specific FAQ
Q: Can I use two 6ES7405-0KA02-0AA0 modules in the same rack for redundancy?
A: Yes. Two PS 405 modules can be installed in Slots 1 and 2 of a UR1/UR2 rack and configured for redundant power supply operation, providing automatic failover if one PSU fails.
Q: Is this module compatible with the S7-400H (high-availability) system?
A: The 6ES7405-0KA02-0AA0 is compatible with standard S7-400 racks used in H-system configurations. Verify your H-system rack type (UR2-H) supports this PSU slot assignment.
Q: What is the difference between the PS 405 and PS 407 series?
A: The PS 405 series (this module) accepts 24 VDC input. The PS 407 series accepts 120/230 VAC input. Choose based on your panel’s available power source.
Q: My existing PSU shows a red BATT LED — does replacing it with this module resolve the issue?
A: The BATT LED indicates a low or missing backup battery on the CPU module, not the PSU. Replace the CPU’s backup battery (e.g., 6ES7971-0BA00) separately.
Q: Do you provide a certificate of conformity (CoC) or material test report (MTR)?
A: Yes. CoC documentation is available upon request for all orders. Contact support@konmask.com with your order number after purchase.
Q: What is the lead time for this part?
A: In-stock units ship within 1–2 business days. For out-of-stock items, typical lead time is 7–15 business days depending on sourcing. Contact us to confirm current stock status.
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