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PRODUCT DESCRIPTION
6ES7405-0DA02-0AA0 powers S7-400 rack electronics
Siemens 6ES7405-0DA02-0AA0 is the SIMATIC S7-400 PS 405 4A system power supply for 24, 48 or 60 V DC networks. It supplies the rack backplane with 5 V DC at up to 4 A and 24 V DC at up to 0.5 A, with a documented input range of 19.2 to 72 V DC.
The single-slot unit powers the installed rack electronics rather than external signal-module loads. Check both backplane current budgets, the coded DC power connector and protective conductor; optional battery backup serves memory retention and is not an uninterrupted supply for operating the complete rack.
The single-slot unit powers the installed rack electronics rather than external signal-module loads. Check both backplane current budgets, the coded DC power connector and protective conductor; optional battery backup serves memory retention and is not an uninterrupted supply for operating the complete rack.
BEFORE YOU BUY
Check the rack power arrangement
ACTUAL APPLICATIONS
Where 6ES7405-0DA02-0AA0 supports DC-fed control racks
The Siemens S7-400 module and installation manuals document rack-electronics supply, optional memory backup and power-fault diagnostics. Each task requires the installed rack and module load to be checked.
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01 · RACK ELECTRONICS
Supply the controller backplane
Use the PS 405 4A to power compatible S7-400 modules through the rack backplane from a supported DC network. Add the connected modules' demand separately for the 5 V and 24 V rails, and provide the signal modules' field-load voltage from the appropriate external supply. -
02 · MEMORY RETENTION
Maintain a planned backup path
Where the installed CPU and configurable modules require battery-backed RAM, use the documented optional backup arrangement and monitor its status. Check the actual battery-backed loads and approved battery before estimating retention time; this backup does not keep the control program running through an outage. -
03 · POWER DIAGNOSTICS
Investigate rack supply faults
Use the DC5V, DC24V and INTF indications together with the CPU diagnostic information to distinguish missing supply, overload and internal faults. Check the documented recovery procedure and any programmed power-supply error handling before clearing an indication and returning the station to operation.
Technical specifications for 6ES7405-0DA02-0AA0
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Product Model6ES7405-0DA02-0AA0
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Product ParametersDC Rack Power Supply
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In stock1 unit
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ManufacturerSiemens
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Nominal input voltage24, 48 or 60 V DC
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Permitted DC input range19.2 to 72 V DC
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5 V backplane outputUp to 4 A; no base load required
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24 V backplane outputUp to 0.5 A; idling-proof
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Input current at rated voltages2 A at 24 V; 1 A at 48 V; 0.8 A at 60 V
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Maximum inrush current18 A; 20 ms full width at half maximum
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Mains-failure stored-energy time20 ms
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Typical power loss16 W
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Operating ambient temperature0 to 60 deg C
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Protective constructionClass I with PE; primary/secondary isolation
View all additional
Alternative Names
6ES7405-0DA02-0AA0
PS 405 4A
SIMATIC S7-400 PS405 4A
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
S7-400 BACKPLANE POWER
Budget both voltage rails before fitting the supply
Siemens 6ES7405-0DA02-0AA0 is the SIMATIC S7-400 PS 405 4A system power supply for 24, 48 or 60 V DC networks. It supplies the rack backplane with 5 V DC at up to 4 A and 24 V DC at up to 0.5 A, with a documented input range of 19.2 to 72 V DC.
The single-slot unit powers the installed rack electronics rather than external signal-module loads. Check both backplane current budgets, the coded DC power connector and protective conductor; optional battery backup serves memory retention and is not an uninterrupted supply for operating the complete rack.
Mount the supply in the permitted rack power-supply position and use its DC-coded three-pin connector. The primary and secondary sides are isolated, while the two output rails share a common secondary ground. Keep the protective conductor and enclosure ventilation intact.
Features:
- 5 V DC output up to 4 A
- 24 V DC output up to 0.5 A
- External load voltage is supplied separately
The Siemens 6ES7405-0DA02-0AA0 requires the rack position, two output-current budgets and DC supply connection to be verified for reliable system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
Match 6ES7405-0DA02-0AA0 as PS 405 4A, not an AC-input PS 407 or a redundant 10A R variant. Record the connected rack modules, power connector coding, supply voltage, backup arrangement and current fault indications before removal.
Establish the required process safe state and disconnect the incoming supply. The standby switch suppresses the output voltages but does not provide supply isolation. Remove or insert the power connector only with power removed, and retain the protective conductor and cable strain relief.
Restore the supply and verify the DC5V and DC24V indications, CPU status and any enabled backup monitoring. The current Siemens Mall entry is PM300 Active; confirm the supplied condition and exact accessory scope in the quotation.
Features:
- Preserve the DC connector and protective conductor
- Check both backplane load totals
- Resolve faults before acknowledging with FMR
The Siemens 6ES7405-0DA02-0AA0 PS 405 4A requires replacement verification of incoming DC power, rack loading and the backup arrangement before service is resumed.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: Official documents are provided through manufacturer links. Accessories, manuals, cables, calibration data, software, certificates, and other items are not included with this equipment unless listed in the stock item description.
Features:
- Available Siemens document references are confirmed before order
- Software licensing and project backups remain the customer's responsibility
- Accessories are supplied only when listed in the quotation
Documentation for the Siemens 6ES7405-0DA02-0AA0 must be checked against the PS 405 4A section and the DC connector instructions; confirm manual availability in the written quotation.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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01
Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed size23.3 × 30.1 × 4.1 cm
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Shipping weightApprox. 0.76 kg
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS reference85044095
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OriginGermany
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
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Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 6ES7405-0DA02-0AA0
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Can the PS 405 standby switch make the supply connector safe to unplug?
No. Siemens states that the standby switch acts on the output control loop and does not disconnect the incoming supply. Isolate the upstream source and verify the required safe state before unplugging, inserting or wiring the coded power connector. -
Does the 4 A rating apply to the 24 V backplane rail as well?
No. The 4 A rating belongs to the 5 V backplane output. The 24 V backplane output is limited to 0.5 A. Calculate the installed modules' demand on each rail separately; neither value is an external field-load power allowance. -
Can two PS 405 4A units be specified as a redundant hot-swap pair?
Do not specify this arrangement from the PS 405 family name alone. The manual identifies the separate 10A R articles for redundant operation and replacement while operating. The exact 4A article is not listed as one of those redundant-capable supplies. -
What is the distinction between the 20 ms buffer figure and optional battery backup?
The 20 ms figure is the specified mains-failure stored-energy time. Optional battery backup preserves supported parameters and RAM through the backplane. It does not turn the supply into a UPS that continues running the whole rack or its field equipment. -
Why can a newly inserted supply remain off despite a correct DC input?
One documented cause is installation in an unsuitable rack slot. Siemens directs the technician to disconnect the incoming supply, install the module in slot 1 and wait at least one minute before restoring power. Check the rack layout instead of repeatedly operating the standby switch. -
What does a flashing DC24V LED after an overload has cleared indicate?
The manual describes recovery of the 24 V output after the overload is removed, with the event also recorded by the CPU. Check the connected load and the actual fault condition first; use the FMR acknowledgement procedure only after the cause has been corrected. -
Does the optional backup arrangement determine a fixed storage time for every rack?
No. Retention time depends on the approved battery capacity and the combined backup-current demand of the connected modules and supply. Determine the actual station configuration and battery condition rather than applying a retention period from an unrelated example rack. -
Which cable details should be checked before reusing the original DC connector?
The exact technical data specifies three 1.5 mm2 conductors and a cable outer diameter of 3 to 9 mm. Check connector coding, PE identification, conductor preparation and strain relief against section 4.12; replace damaged connection parts before energizing.
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