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6ES5451-4UA12

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6ES5451-4UA12 is a Siemens SIMATIC S5 32-channel digital output module for 24 V DC, 0.5 A loads. The module provides short-circuit protection and alarm behavior for legacy S5-115U control cabinets.
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Technical specifications for 6ES5451-4UA12

  • Manufacturer:
    Siemens
  • Part Number:
    6ES5451-4UA12
  • Product Family:
    Siemens Simatic S5
  • Product Type:
    SIMATIC S5 Digital Output Module
  • Stock:
    1
  • Module function:
    Digital output
  • Output count:
    32
  • Rated load voltage:
    24 V DC
  • Maximum output current:
    0.5 A per channel
  • Minimum output current:
    5 mA
  • Off-state residual current:
    Less than 0.5 mA
  • Off-state residual voltage:
    Less than 3 V
  • On-state output voltage:
    Greater than supply minus 1.5 V
  • Output protection:
    Short-circuit protected
  • Diagnostic behavior:
    Short-circuit alarm
  • Permissible cable length:
    Less than 400 m
  • Rack width:
    1 slot
  • Output paralleling:
    Not permitted
  • Output technology:
    Transistor
  • Fault recovery:
    Remove the field fault before reset or replacement
  • Weight:
    1.01 lbs (0.46 kg)
  • Estimated shipping dimensions:
    2 x 19.5 x 25.5 cm
  • Tariff Code:
    8537101190
  • 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 Applications Diagnostics & Protection Output Switching Performance & Efficiency

Features:

  • Switches thirty-two discrete 24 V DC loads from one SIMATIC S5 slot.
  • Provides up to 0.5 A per output with documented short-circuit protection.
  • Reports output-side faults through the module alarm behavior.
The exact spare is 6ES5451-4UA12, a 32-output 24 V DC module in the SIMATIC S5 family.

It translates S5 control commands into protected transistor outputs for panel and machine actuators.

Confirm rack, address, connector, supply grouping, load current, and program logic before moving field wiring.

Availability is subject to Apter Power inventory and sourcing confirmation.
Verified resources for Siemens 6ES5451-4UA12: Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Control solenoids, interface relays, lamps, and other 24 V DC industrial loads.
  • Maintain established S5-115U output sections that require the exact 32-channel configuration.
  • Restore a failed output bank after wiring and the original short-circuit cause have been resolved.
  • Short-circuit protection limits damage when an output circuit is overloaded or faulted.
  • The module alarm should be incorporated into troubleshooting before a board is replaced.
  • Investigate field wiring, load inrush, and suppression so a replacement does not repeat the failure.
  • Each channel is specified for 5 mA to 0.5 A within the overall operating limits.
  • The on-state voltage remains above the 24 V supply minus the documented 1.5 V drop.
  • Outputs must not be connected in parallel to increase current capacity.
  • Thirty-two outputs occupy one documented rack slot, supporting dense cabinet construction.
  • Field cables may extend to the documented maximum when installation rules and voltage drop are satisfied.
  • Low off-state residual current and voltage support predictable de-energized load behavior.
Description
Siemens 6ES5451-4UA12 is the 32-point digital output module documented for SIMATIC S5 equipment. Each transistor output is intended for 24 V DC service with up to 0.5 A load current under the specified group and module limits.

The module switches actuators such as solenoids, relays, indicator circuits, and other discrete DC loads from the S5 process image. Short-circuit protection and the associated alarm behavior help the controller identify output-side faults.

Do not parallel output channels, and do not treat the module as equivalent to another 451 suffix without checking the rack, addressing, connector, load grouping, diagnostic response, and program. Verify field-energy isolation and inductive-load suppression before transferring conductors.
Alternative Names
6ES5451-4UA12 6ES5 451-4UA12 6ES5-451-4UA12 6ES54514UA12 Siemens 6ES5451-4UA12 SIMATIC S5 451-4UA12 S5 32DO 24VDC 0.5A Siemens 451 Digital Output Module
Technical notes
For 6ES5451-4UA12, never parallel outputs; verify group current, inductive suppression, connector wiring, rack addressing, and short-circuit cause before energizing.
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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.
What output capacity is documented for Siemens 6ES5451-4UA12?
It provides 32 short-circuit-protected 24 V DC transistor outputs rated up to 0.5 A each within the module limits.
Which S5 installation details must match Siemens 6ES5451-4UA12?
Confirm rack type, slot, address range, front connector, 24 V load supply, common grouping, output program, and diagnostic handling.
What loads are commonly controlled by Siemens 6ES5451-4UA12?
It operates appropriately rated DC solenoids, interface relays, indicators, and other discrete actuators in legacy SIMATIC S5 systems.
What is the procurement status of Siemens 6ES5451-4UA12?
The S5 module is legacy hardware; Apter Power can check exact-order-number stock, condition, quantity, and delivery options.
Can another 6ES5451 module replace Siemens 6ES5451-4UA12 directly?
Not by family number alone; channel count, voltage, current, connector, addressing, protection, diagnostics, and rack approval must all match.
What should be supplied with a Siemens 6ES5451-4UA12 quotation request?
Send front and side labels, rack model, connector number, load-voltage and current schedule, fault history, quantity, and destination.

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