Product Overview

The Siemens 6AG1931-2BA00-3AA0 is a SIPLUS PS 24V/0.375A DC/DC converter designed to provide a stabilized 24 V DC output for industrial electrical and automation equipment. Based on the Siemens 6EP1731-2BA00 platform, this power supply is part of the SIPLUS product range, which includes equipment designed for applications involving environmental stresses.

Unlike a conventional AC/DC power supply, the 6AG1931-2BA00-3AA0 accepts a DC input voltage ranging from 48 V to 220 V DC. It converts the incoming DC supply into a regulated 24 V DC output with a rated current of 0.375 A. This makes it suitable for supplying compatible low-power control circuits, electronic devices, and auxiliary components in industrial installations.

The unit features conformal coating on its electronic assemblies. This coating provides additional protection against certain environmental influences, helping the equipment operate in applications where ordinary industrial electronics may be exposed to more demanding conditions. The specified operating temperature range is -25°C to +70°C.

The compact design supports integration into industrial electrical panels and auxiliary power distribution arrangements. Its role is to provide a stable low-voltage DC supply for compatible equipment rather than to serve as a high-current system power supply.

When selecting this model, engineers should verify the DC input range, output current requirement, installation environment, and compatibility with the connected load. These checks are particularly important when replacing an existing power supply or maintaining a legacy automation system.

Technical Specifications

Note: The dimensions and weight are the supplied listing values. Confirm the exact device and packaging configuration before using these figures for logistics or panel-layout calculations.

Function and Working Principle

The main function of the 6AG1931-2BA00-3AA0 is to convert a relatively high DC input voltage into a regulated 24 V DC output. This allows industrial control equipment designed for 24 V DC operation to receive an appropriate supply from a compatible DC power source.

1. DC Input Conversion

The module accepts an input voltage between 48 V and 220 V DC. This wide input range allows it to be considered for installations where the available DC supply may differ from the voltage required by connected control equipment.

Before connecting the module, the input voltage and polarity must be checked against the manufacturer’s electrical specifications. The supply source must also be capable of providing the required input power under the actual operating conditions.

2. Regulated 24 V DC Output

The converter provides a nominal 24 V DC output with a rated current of 0.375 A. Its maximum nominal output power is therefore approximately 9 W.

A regulated output is important for electronic control devices because variations in supply voltage can affect their operation. The module provides a suitable power source for compatible low-power loads within its rated output capacity.

The total current drawn by all connected devices must remain within the module’s rated output current. If the load requires more than 0.375 A, a power supply with a higher current rating should be selected.

3. Stabilized Power Conversion

The internal DC/DC conversion circuitry regulates the output voltage while the input voltage varies within the permitted operating range.

This function supports the operation of connected electronics that require a stable 24 V DC supply. Proper selection of the input source, wiring, and load is essential for achieving reliable operation.

4. Conformal Coating Protection

The 6AG1931-2BA00-3AA0 belongs to the SIPLUS product range and includes conformal coating on its electronic assemblies.

Conformal coating is a protective layer applied to electronic circuit boards. It can help reduce the effects of certain environmental contaminants and moisture exposure, depending on the coating specification and installation conditions.

This feature is particularly relevant in industrial environments where equipment may be exposed to airborne contaminants or other environmental stresses. However, conformal coating does not make the unit waterproof or suitable for unrestricted exposure to liquids.

Role in Industrial Automation Systems

A stable 24 V DC supply is an important requirement in many industrial automation installations. Sensors, electronic interfaces, control circuits, and auxiliary devices often depend on a reliable low-voltage power source.

The Siemens 6AG1931-2BA00-3AA0 can provide this supply in installations where a compatible DC source is available.

1. Supplying Control Electronics

Industrial control systems commonly contain electronic devices that require 24 V DC. The converter can supply compatible low-power equipment, provided that the combined current demand remains within the 0.375 A rating.

This makes it suitable for selected auxiliary circuits rather than large groups of high-current automation modules.

2. Supporting PLC-Related Circuits

A PLC-based installation may contain separate power arrangements for the controller, sensors, communication interfaces, and auxiliary electronics.

The 6AG1931-2BA00-3AA0 may be used to supply compatible low-power 24 V DC circuits associated with an automation system. It should not be assumed to replace the main PLC system power supply without checking the required current and voltage specifications.

3. Auxiliary Power Distribution

Industrial machines often require several different DC voltage levels. A DC/DC converter allows a suitable higher-voltage DC source to supply a lower-voltage control circuit.

This can help organize auxiliary power distribution in equipment cabinets, provided that the input and output ratings are correctly matched to the installation.

4. Maintaining Stable Electronic Operation

Electronic control devices may experience operational problems when their supply voltage falls outside the permitted range. A regulated DC/DC converter helps provide the required voltage to compatible loads.

The converter should be installed with appropriate wiring, protection, and load management to maintain reliable power delivery.

Industrial Applications

The 6AG1931-2BA00-3AA0 is intended for low-power auxiliary DC supply applications. Its 24 V DC output and 0.375 A current rating should be considered when evaluating its suitability.

1. Industrial Control Cabinets

Control cabinets contain PLCs, relays, interfaces, sensors, and other electronic devices. Some auxiliary circuits may require a separate 24 V DC supply.

This converter can be used for compatible low-power circuits where a 48–220 V DC input is available.

2. Process Automation Equipment

Process automation systems often use electronic monitoring and control devices distributed throughout a plant. Certain auxiliary components require stable DC power for their operation.

The module may support selected low-power devices in these systems, subject to output-current and environmental requirements.

3. Power Distribution Panels

Industrial power distribution installations may contain different DC voltage levels for control and monitoring equipment. A DC/DC converter can provide a lower-voltage supply from a compatible higher-voltage DC source.

The 6AG1931-2BA00-3AA0 can be considered for applications where its input range and 9 W output capacity are sufficient.

4. Auxiliary Monitoring Circuits

Monitoring equipment and electronic interfaces may require a regulated 24 V DC supply. The converter can support compatible loads in auxiliary monitoring circuits.

The actual load current, startup requirements, and voltage tolerance should be checked before connection.

5. Industrial Environments with Environmental Stress

The SIPLUS design and conformal coating make this model relevant to applications where environmental conditions require additional protection for electronic assemblies.

The installation must still comply with the specified temperature range and environmental limitations. Additional enclosure protection may be necessary depending on the site conditions.

Installation and System Integration

Correct installation is essential for safe operation and stable power conversion.

1. Verify the DC Input Voltage

Before installation, confirm that the available supply falls within the specified 48–220 V DC input range.

Check the polarity and electrical characteristics of the source. Do not connect an AC supply to this DC/DC converter.

The upstream source must also provide sufficient power for the converter and its connected load.

2. Confirm Output Requirements

The rated output is 24 V DC at 0.375 A. Calculate the combined current demand of all connected devices before connecting them.

The nominal maximum output power is approximately 9 W. Loads that exceed the current or power rating may cause abnormal operation or activate protection mechanisms.

3. Mounting and Panel Arrangement

The supplied dimensions are 100 × 110 × 35 mm, and the supplied weight is 0.171 kg.

Verify the physical dimensions and original mounting arrangement before designing or modifying the control cabinet. Allow sufficient space for wiring, ventilation, and maintenance access.

The device should be installed in an environment consistent with its specified operating conditions.

4. Wiring and Electrical Protection

Use appropriately rated conductors and terminals. Ensure that input and output wiring are correctly identified and connected.

The installation should include suitable upstream protection according to the manufacturer’s documentation and applicable electrical regulations. Avoid loose terminals and damaged insulation.

Before servicing, isolate the DC supply and verify that the circuit is safe to work on.

5. Environmental Considerations

The conformal coating provides additional protection for the electronic assemblies, but the module should not be exposed to conditions beyond its specified environmental limits.

Maintain a suitable installation environment and use an appropriate cabinet when protection from dust, moisture, or mechanical damage is required.

6. Functional Testing

After installation, verify the input voltage and measure the output voltage under normal operating conditions.

Check that the connected load operates correctly and that the total current remains within the rated output capacity. Record the installation details for future maintenance.

Compatible System Components

The 6AG1931-2BA00-3AA0 is designed to provide auxiliary 24 V DC power. Its compatibility depends on the electrical requirements of the connected devices.

The components listed above are examples of possible application equipment. They are not necessarily supplied with the converter.

Alternative Models and Replacement Considerations

The 6AG1931-2BA00-3AA0 has been cancelled by Siemens. The manufacturer identifies 6AG1332-0TA00-7AY0 as a successor product.

However, the successor has different electrical characteristics. The 6AG1931-2BA00-3AA0 provides 24 V DC at 0.375 A from a 48–220 V DC input, whereas the listed successor supports AC and DC input arrangements and provides a 24 V DC output rated at 2.5 A.

Therefore, the successor should not be treated as an automatic drop-in replacement.

Before selecting a replacement, compare:

• DC input voltage range.
• Input polarity and connection arrangement.
• Output voltage and current.
• Maximum output power.
• Startup and load characteristics.
• Mounting dimensions and terminal layout.
• Operating temperature range.
• Conformal coating and environmental protection.
• Required certifications and installation standards.

A replacement with a higher current rating may provide sufficient electrical capacity, but its input range, wiring, dimensions, and operating characteristics must still match the application.

Key Advantages

Wide DC Input Range

The converter accepts 48–220 V DC input, making it suitable for selected installations where a higher-voltage DC source is available.

Stabilized 24 V DC Output

It provides a regulated 24 V DC output for compatible low-power industrial electronics.

Compact Design

Its compact dimensions support installation in industrial electrical assemblies where space is limited.

Conformal Coating

The SIPLUS configuration includes conformal coating, providing additional protection for electronic assemblies in applications involving environmental stress.

Industrial Automation Applications

The module can support auxiliary control circuits, monitoring equipment, and other compatible low-power devices in industrial installations.

Established Siemens Product Platform

The product is based on the Siemens 6EP1731-2BA00 platform, providing a clear reference for identifying its electrical function and technical characteristics.

Technical FAQs

1. What is the Siemens 6AG1931-2BA00-3AA0?

It is a SIPLUS PS 24V/0.375A DC/DC converter designed to convert a 48–220 V DC input into a regulated 24 V DC output.

2. What is the output current?

The rated output current is 0.375 A. The connected load must remain within this current limit.

3. What is the maximum output power?

At 24 V DC and 0.375 A, the nominal output power is approximately 9 W.

4. Does this model accept AC input?

No. The 6AG1931-2BA00-3AA0 is a DC/DC converter with a specified input range of 48–220 V DC. It should not be connected directly to an AC supply.

5. What is the purpose of the conformal coating?

The coating provides additional protection for the electronic assemblies against certain environmental influences. It does not make the unit waterproof or eliminate the need for suitable installation protection.

6. Can it supply a PLC?

It may supply a compatible low-power 24 V DC auxiliary circuit, but its 0.375 A output rating is limited. Check the PLC’s required supply current and the complete load before using it.

7. Is the 6AG1931-2BA00-3AA0 still available from Siemens?

The model was cancelled effective January 12, 2024. Availability may depend on existing stock and industrial spare-parts suppliers.

8. What is the successor model?

Siemens lists 6AG1332-0TA00-7AY0 as the successor. However, its input and output specifications differ from the original model, so engineering verification is required before replacement.

9. What should be checked before purchasing?

Verify the full part number, nameplate information, input and output ratings, physical condition, terminal condition, and product history. For used equipment, request clear photographs and appropriate functional test information.

10. Can this module replace a standard 24 V AC/DC power supply?

Not automatically. It requires a DC input within its specified range and provides only 0.375 A output current. A standard AC/DC supply may have a different input arrangement, output capacity, and installation configuration.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1931-2BA00-3AA0, begin by confirming the complete order number and the electrical requirements of the existing installation.

Because the model has been cancelled, buyers should verify whether the unit is new old stock, used, or refurbished. Request clear photographs of the product label and terminal connections. Confirm the actual condition, available documentation, warranty terms, and shipping details before placing an order.

For replacement projects, do not rely on the successor designation alone. Compare the original 48–220 V DC input range and 24 V DC/0.375 A output with the proposed replacement’s specifications. Check whether the existing wiring, mounting arrangement, and protection devices can be retained.

During maintenance, inspect wiring, terminals, insulation, and the surrounding installation environment. Verify the DC input voltage and output voltage when troubleshooting supply-related faults. Keep the connected load within the rated output current and document any changes made to the power distribution arrangement.

Conclusion

The Siemens 6AG1931-2BA00-3AA0 SIPLUS PS 24V/0.375A is a compact DC/DC converter designed to provide regulated 24 V DC power from a 48–220 V DC input. Based on the 6EP1731-2BA00 platform, it includes conformal coating and is intended for compatible auxiliary power applications in industrial automation systems.

Its 0.375 A output rating makes it suitable for low-power control and monitoring circuits rather than high-current equipment. Since the model has been cancelled, accurate identification and careful evaluation of electrical compatibility are essential when sourcing or replacing this Siemens power supply.