6ES7405-0RA01-0AA0 - Power Supply Module - SIEMENS

Siemens power supply 6ES7405-0RA01-0AA0 - SIMATIC S7-400 PS 405 Wide Range 20 A

The power module 6ES7405-0RA01-0AA0 belongs to the SIMATIC S7-400 PS 405 family from Siemens. Designed to power S7-400 programmable controllers, it provides 5 V DC at a nominal current of 20 A to the backplane bus, ensuring electrical stability for CPUs and expansion modules. Its 24/48/60 V DC input range allows direct connection to DC networks commonly found in industrial installations, including applications using auxiliary DC power. This module meets production availability requirements by providing a stable supply, native mechanical integration into S7-400 racks and simplified maintenance through single-unit replacement.

Technical specifications

• Référence constructeur : 6ES7405-0RA01-0AA0
• Gamme : SIMATIC S7-400 PS 405
• Constructeur : Siemens
• Type : Power module for S7-400 rack
• Tension d’entrée : 24/48/60 V DC, wide admissible range
• Tension de sortie : 5 V DC
• Courant de sortie nominal : 20 A
• Destination : Supply for the backplane bus of SIMATIC S7-400 CPUs and modules
• Compatibilité : SIMATIC S7-400 programmable controllers
• Montage : Direct integration on S7-400 chassis/rack

Overview of the SIMATIC S7-400 range

The SIMATIC S7-400 series is Siemens' controller architecture aimed at advanced control applications, continuous processes and installations requiring high modularity. The PS 405 power modules are specifically designed to supply the 5 V DC backplane voltage, ensuring proper power to CPUs, communication modules and I/O cards. The 6ES7405-0RA01-0AA0 model stands out with a wide range DC input, useful where AC mains power is not available or where the infrastructure favors stable DC networks.

• Wide range DC modules : suitable for DC-powered environments, offering compatibility with 24/48/60 V DC to meet various plant standards.
• Modules for S7-400 architectures : native mechanical and electrical integration into chassis, distributing the 5 V DC backplane voltage to modules.

In SIMATIC systems, the PS module plays a central role in availability. A correctly sized and dedicated 5 V DC bus supply helps reduce faults caused by voltage drops and prevents unexpected restarts of CPUs and cards.

Industrial applications

This Siemens power module is suitable for installations where controller reliability is critical for service continuity. The combination of 24/48/60 V DC input and 5 V DC / 20 A output meets the needs of a wide range of industrial applications :

• Process and utilities : automation of processing units, auxiliary supervision, management of safety-instrumented equipment around an S7-400.
• Machines and assembly lines : control of axes, conveyors and manipulators via S7-400 CPUs and distributed I/O modules.
• Packaging and intralogistics : equipment synchronization, flow control and traceability, where stability of the controller's 5 V DC backplane is critical.
• Water, energy and environment : operating stations requiring available DC power, with the need for a reliable internal supply for the central controller.
• Process industries : chemical, food, paperboard and cement plants, where unplanned downtime must be minimised by robust controller power supplies.

Integration and communication

The 6ES7405-0RA01-0AA0 is installed directly on the S7-400 chassis. The input connection is made to the available 24/48/60 V DC source in the facility, while the output supplies the 5 V DC backplane bus for CPUs and modules. The module is dedicated to power delivery; it requires no software configuration and does not need any fieldbus. This operational simplicity facilitates preventive and corrective maintenance, and minimises downtime during replacements.

From a system engineering perspective, choosing a PS 405 power supply sized at 20 A allows absorbing the cumulative consumption of cards installed in the rack, within the limits specified by the manufacturer. Siemens documentation provides the recommended placement calculation to validate the balance between module count, bus load and supply capacity. For specific architectural requirements, notably redundant systems present in some configurations of the range, refer to the S7-400 technical documentation.

Availability and warranty

The Siemens power module 6ES7405-0RA01-0AA0 is offered by Standard Exchange Industry as refurbished units or standard exchange, bench-tested and delivered with warranty. Depending on the chosen service, the warranty period ranges from 6 to 24 months. Shipping is provided within 24 to 72 hours to over 120 countries to meet line restart constraints. If you have any doubts about compatibility with your SIMATIC S7-400 chassis, our technical team can verify the match between the 20 A capacity, your modules' load profile and rack topology. A repair service is also available when keeping the existing reference in place is required. For further information, the Siemens datasheet for the reference details limitations, wiring instructions and recommended operating conditions.