6ES7405-0KA02-0AA0
6ES7405-0KA02-0AA0
6ES7405-0KA02-0AA0
6ES7405-0KA02-0AA0
6ES7405-0KA02-0AA0
6ES7405-0KA02-0AA0
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6ES7405-0KA02-0AA0

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Siemens 6ES7405-0KA02-0AA0 is a SIMATIC S7-400 PS 405 10 A DC-input power supply that feeds the rack’s 5 V and 24 V backplane rails.
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Technical specifications for 6ES7405-0KA02-0AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7405-0KA02-0AA0
  • Product Family:
    Siemens Simatic S7-400
  • Product Type:
    SIMATIC S7-400 PS 405 power supply
  • Stock:
    1
  • Mains/voltage failure stored energy time:
    20 ms
  • Mains buffering according to NAMUR recommendation:
    Yes
  • Rated value at 24 V DC:
    4 A
  • Rated value at 48 V DC:
    2 A
  • Rated value at 60 V DC:
    1.6 A
  • Inrush current, max.:
    18 A; Full width at half maximum 20 ms
  • Type of output voltage:
    DC
  • for backplane bus (5 V DC), max.:
    10 A; no base load required
  • for backplane bus (24 V DC), max.:
    1 A; idling-proof
  • Short-circuit protection:
    Yes
  • Active power input, typ.:
    95 W
  • Power loss, typ.:
    20 W
  • Backup battery (optional):
    Yes; 2x lithium AA; 3.6 V / 2.2 Ah
  • Required slots:
    2
  • Weight:
    1.335 kg
  • Estimated shipping dimensions:
    23.3 x 29.5 x 6.3 cm
  • Tariff Code:
    85044095
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals DC Input Fit Rack Power Fault Response Product Applications

Features:

  • DC-fed S7-400 supply: PS 405 serves racks built around a 24, 48 or 60 V DC source rather than an AC mains feed.
  • Two backplane rails: The module feeds both rack voltage paths, so the station load must be considered across both rails.
  • Short-interruption support: Stored energy buffers a brief input-voltage dip; sustained loss still requires a suitable DC supply strategy.
For a DC-powered SIMATIC S7-400 station, 6ES7405-0KA02-0AA0 is a PS 405 10 A power supply rather than a CPU or field I/O module.

Its role is to energize the rack backplane, including the 5 V logic rail and the auxiliary 24 V rail used by the station.

For an existing cabinet, the DC source, module-space allowance and expected rack load define the selection before installation.

Apter Power can help source Siemens 6ES7405-0KA02-0AA0 SIMATIC S7-400 PS 405 power supply documentation and prepare an exact-model quotation.
Siemens 6ES7405-0KA02-0AA0 SIMATIC S7-400 PS 405 power supply Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, software and batteries are not included unless expressly listed in the offered item description. Prices are quoted in USD.
  • DC source: A 24, 48 or 60 V DC cabinet feed suits this PS 405 variant; an AC-fed station requires a different supply family.
  • Supply envelope: Siemens permits 19.2 to 72 V DC under static conditions, making source variation a design consideration rather than an assumed nominal-only match.
  • Current allowance: The input draws different rated currents at the three nominal voltages; upstream conductors and protective devices should suit the chosen feed.
  • Startup demand: The specified inrush peak is higher than steady-state draw, so protective-device selection should allow for energization.
  • Rack space: This 10 A PS 405 occupies two S7-400 slots, which matters when replacing a one-slot power supply.
  • Logic supply: The 5 V backplane rail serves the station modules without a minimum base-load requirement.
  • Auxiliary rail: The 24 V backplane path is rated separately and is idling-proof; it should not be confused with the external DC input.
  • Electrical separation: Siemens specifies primary-to-secondary separation and protective-conductor class I, shaping the cabinet grounding arrangement.
  • Overload recovery: For this PS 405, a short circuit or overload leads to shutdown followed by an automatic restart attempt after the fault clears.
  • 24 V rail: When overload drives the rail below its threshold, repeated disconnection and reconnection can appear until the load recovers.
  • 5 V rail: A sustained 5 V overload has a different CPU consequence, so it should not be diagnosed as only a transient 24 V issue.
  • Diagnostic cues: The supply LEDs and the CPU diagnostic buffer help distinguish a backplane power fault from a normal operating state.
  • SIMATIC S7-400 stations: This PS 405 provides rack backplane power in a controller station built for DC input.
  • 24/48/60 V cabinet systems: One wide-range supply type can be selected where the installed cabinet uses one of Siemens’ stated DC supply levels.
  • Two-rail rack loads: Stations requiring both the 5 V logic rail and the separate 24 V backplane rail can be assessed against this module’s output ratings.
Description
For a DC-fed SIMATIC S7-400 station, Siemens 6ES7405-0KA02-0AA0 supplies the rack backplane rather than processing field signals. The wide-range PS 405 design accepts 24, 48 or 60 V DC cabinet feeds, helping maintenance teams distinguish it from an AC-input supply before planning a replacement.

The 10 A 5 V rail and separate 24 V rail serve different rack loads. With 6ES7405-0KA02-0AA0, the published input-current figures are not output ratings; the installed module mix and two-slot space allowance are the more useful fit checks for an S7-400 cabinet.

Brief DC interruptions are buffered for about 20 ms, while short-circuit protection and supply diagnostics support fault assessment. For 6ES7405-0KA02-0AA0 sourcing, the optional backup batteries should be specified separately so the quotation reflects the required supply scope without assuming they accompany the module.
Alternative Names
6ES74O5-OKAO2-OAAO 6ES74050KA020AA0 6ES74O5OKAO2OAAO 6ES7 405-0KA02-0AA0 6ES7405 0KA02 0AA0 6ES7405-0KAO2-0AA0 6ES7405-0KA02-OAA0 6ES7405-OKA02-0AA0
Technical notes
Siemens lists 6ES7405-0KA02-0AA0 as the standard PS 405 10 A DC supply and 6ES7405-0KR02-0AA0 separately as the redundant variant. A cabinet designed around redundant power paths therefore needs the correct variant rather than an order-code substitution. Apter Power can help compare the installed supply code with the requested spare.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can 6ES7405-0KA02-0AA0 operate in a cabinet reaching 65 °C?
Its published operating ambient is 0 to 60 °C, so a 65 °C cabinet exceeds that limit. Apter Power can help review the enclosure conditions before sourcing.
How much heat should enclosure cooling allow for 6ES7405-0KA02-0AA0?
Siemens specifies a typical 20 W power loss. That heat should be included with the other rack equipment in the cabinet cooling budget.
What upstream power capacity should be budgeted for 6ES7405-0KA02-0AA0?
The official datasheet gives about 95 W of typical active power input. The upstream DC source should be sized for the complete station and its startup conditions.
What cable termination is specified for 6ES7405-0KA02-0AA0?
The Siemens datasheet specifies three 1.5 mm² solid or stranded conductors with end sleeves and an external cable diameter of 3–9 mm.
Will 6ES7405-0KA02-0AA0 maintain operation through a long DC outage?
Its published mains buffering is about 20 ms, so longer ride-through needs a system-level solution. Apter Power can help match the spare to that power plan.
Are backup batteries included with every 6ES7405-0KA02-0AA0 order?
Siemens describes backup batteries as optional. Please state the battery requirement when requesting a quotation so Apter Power can define the supplied scope clearly.
Can external 24 V field loads be assigned to 6ES7405-0KA02-0AA0 without checking the design?
The published 24 V/1 A rail feeds the rack backplane. External field-power arrangements depend on the cabinet design, which Apter Power can help review with the installed wiring.
What cabinet depth is needed for 6ES7405-0KA02-0AA0?
The module itself is 217 mm deep, 290 mm high and 50 mm wide. A replacement should also allow space for the installed wiring and rack arrangement.

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