6ES7405-0KR02-0AA0 - Power Supply Module - SIEMENS

Siemens Power Supply 6ES7405-0KR02-0AA0 - SIMATIC S7-400 PS405

The reference 6ES7405-0KR02-0AA0 is a PS405 power supply dedicated to the SIMATIC S7-400 series from SIEMENS. Designed to deliver stable service voltages to the programmable controller and its modules, it converts DC 24/48/60 V networks over a wide range of 19.2 to 72 V into 5 V DC / 4 A and 24 V DC rails. This power supply meets the requirements of industrial environments where continuity of service and resistance to supply variations are critical. With an active input power of 95 W, a typical power dissipation of 20 W and a 20 ms hold-up time in the event of a voltage dip, it integrates safely into S7-400 architectures. Its max. inrush current of 18 A over 20 ms, dimensions 290 x 50 x 217 mm and operating temperature up to 60°C make it a robust unit suited to the demands of workshops and process plants. It is aimed at maintenance teams, system integrators and operators seeking a reliable, ready-to-install solution to power a SIMATIC S7-400 rack and ensure the stability of the backplane bus and sensors and actuators powered at 24 V DC.

Technical specifications

• Manufacturer part number : 6ES7405-0KR02-0AA0
• Range : SIMATIC S7-400, PS405 power supply module
• Manufacturer : SIEMENS
• Category : Power Supplies
• Nominal DC input voltage : 24/48/60 V DC
• Acceptable input range : 19.2 to 72 V DC, dynamic 18.5 to 75.5 V DC
• Output voltages : 5 V DC, 24 V DC
• 5 V output current : 4 A
• Active input power : 95 W
• Typical power dissipation : 20 W
• Max. inrush current : 18 A over 20 ms
• Hold-up time on supply failure : 20 ms
• Maximum operating temperature : 60°C
• Dimensions : 290 mm x 50 mm x 217 mm
• Use : Power supply for the SIMATIC S7-400 rack and modules at 5 V and 24 V DC

Overview of the SIMATIC S7-400 range

The SIMATIC S7-400 series is a programmable controller platform designed for process applications and large-scale installations. In this architecture, PS405 power supply modules provide the internal power distribution to the rack, stabilize the 5 V DC rails for logic components and supply a 24 V DC rail for control loads and interfaces. The extended input ranges allow compatibility with different site DC networks, including 24, 48 or 60 V sources, while absorbing short-term dynamic fluctuations. The modular approach of the S7-400 allows selection of the appropriate supply power for the rack and expected load, ensuring hold-up during module startup and the headroom needed for transients. PS405 power supplies are sized to meet industrial operating conditions, with a 20 ms hold-up time that helps filter micro interruptions and preserve the coherence of real-time processing.

• Role in the S7-400 : supplying regulated voltages to the backplane bus and the cards
• Input compatibility : accepts 24, 48 or 60 V DC with extended allowable margin

This range consistency facilitates maintenance and the longevity of installations where obsolescence and spare-part availability constraints require secure replacements.

Industrial applications

The 6ES7405-0KR02-0AA0 power supply module integrates into many contexts where a SIMATIC S7-400 PLC controls the process :

• Continuous processes : production lines, chemical, food-processing, where resistance to micro-interruptions and 5 V stability are essential
• Material handling and intralogistics : conveyors, stacker cranes, accumulation stations controlled by S7-400
• Machine environments : assembly cells, peripheral robots, sensor-actuator interfaces powered at 24 V DC
• Infrastructure and energy : substation supervision, safety automation with high availability requirements
• Batch process industry : metallurgy, paper and board, pharmaceuticals, requiring a stable rack power supply

Integration and commissioning

The PS405 power supply is mounted on the SIMATIC S7-400 rack to feed the backplane bus and installed modules. The 19.2 to 72 V DC input range eases connection to site DC sources, including when rapid variations occur between 18.5 and 75.5 V under dynamic conditions. The 18 A inrush current for approximately 20 ms at startup should be considered when sizing upstream protection. The 20 ms hold-up time contributes to resilience against very short voltage dips, limiting unintended restarts of the CPU and I/O cards. The 5 V DC / 4 A and 24 V DC outputs respectively provide internal logic power and control distribution. The 290 x 50 x 217 mm form factor simplifies mechanical integration in racks where lateral compactness is required, while the operating temperature up to 60°C meets industrial environment constraints.

This unit does not involve communication protocols; its role is limited to supplying service voltages within the SIMATIC S7-400 architecture. For commissioning, verify input polarity, protection rating and the distribution of loads on 5 V and 24 V to remain within the specified nominal ranges.

Availability and warranty

The SIEMENS 6ES7405-0KR02-0AA0 power supply module is offered refurbished or as an exchange unit, bench-tested and delivered with a warranty. Standard Exchange Industry ships within 24 to 72 hours to over 120 countries. In the event of a line stop, our technical team checks compatibility with your SIMATIC S7-400 rack and guides you to the appropriate replacement solution, consistent with the planned 5 V and 24 V load and site operating conditions.