6ES7407-0KR02-0AA0 - Power Supply Module - SIEMENS

Siemens power supply 6ES7407-0KR02-0AA0, SIMATIC S7-400 PS407

The reference 6ES7407-0KR02-0AA0 is a power supply unit from the SIMATIC S7-400 PS407 range designed by SIEMENS for SIMATIC S7-400 programmable logic controller architectures. It converts a wide mains or DC input range into the stabilized service voltages required by the chassis, notably 5 V DC, 10 A, and also provides a 24 V DC service supply depending on the system architecture. This power supply targets maintenance managers, automation engineers and integrators seeking a robust solution tolerant to mains variations and suitable for applications with limited scheduled downtime. It features a wide input range of 85 to 264 V AC, 50/60 Hz, or 88 to 300 V DC, a controlled inrush current and a typical power dissipation of 20 W. Its design supports redundant operation to increase system availability, a key factor in continuous processes and multi-station production lines.

Technical specifications

• Manufacturer reference : 6ES7407-0KR02-0AA0
• Range : SIMATIC S7-400 PS407
• Manufacturer : SIEMENS
• Type : Power supply unit for programmable controller
• Acceptable input voltage : 85 to 264 V AC, 50/60 Hz, or 88 to 300 V DC
• Output voltages : 5 V DC at 10 A, 24 V DC service
• Maximum inrush current : 63 A with a half-width of approximately 1 ms
• Typical power dissipation : 20 W
• Dimensions : 50 mm × 290 mm × 217 mm
• Redundancy : Designed for redundant operation
• Temperature range : Standard industrial operating range
• System compatibility : SIMATIC S7-400 CPU series and modules

Overview of the SIMATIC S7-400 range

The SIMATIC S7-400 series is at the heart of process automation systems and redundant central unit architectures in high-criticality environments. The PS407 modules provide the backplane bus supply in 5 V DC for CPUs and I/O cards, while also offering a 24 V DC service supply depending on the implementation. This functional separation helps stabilise the critical logic voltages and improves electromagnetic compatibility of the system. The wide input range allows international standardisation of references, useful during plant expansions or replacements in corrective and preventive maintenance. The 10 A version meets configurations with high-performance CPUs and densely populated expansion drawers, while preserving current margins needed for inrush and load transients.

For new projects as well as retrofits, choosing a PS407 range power supply ensures homogeneous integration with S7-400 chassis. The internal architecture prioritises the stability of the 5 V DC rail and the reduction of conducted noise on the backplane bus. The ability to operate in redundancy is a major lever to improve availability, particularly in 24/7 process industries. Where specific network constraints exist, the option to accept direct current inputs up to 300 V DC simplifies integration on sites with central rectifiers or networks with significant ripple.

Industrial applications

This power supply fits a wide range of automation applications where stable low voltages are critical to the continuity of the numerical control and process control systems. Typical examples include :

• Continuous processes : chemical, pharmaceutical, oil and gas, food and beverage
• Material handling and conveying : assembly lines, intralogistics, sorting
• Water and utilities : pumping stations, water treatment, utilities
• Automotive and metallurgy : presses, furnaces, cell control
• Packaging and printing : cartoners, unwinders, line control

In these contexts, reliable 5 V DC supply to the S7-400 backplane prevents unintended restarts of CPUs and cards, reduces faults related to logic thresholds and secures communication with peripherals. Unlike a variable frequency drive or a servo drive, this module does not perform motor energy conversion but conditions the power infrastructure of the programmable controller that controls those drives.

Integration and communication

The power supply unit 6ES7407-0KR02-0AA0 is mounted into the SIMATIC S7-400 architecture as specified by the manufacturer. No complex software configuration is required, as its purpose is to deliver stable voltages to the backplane bus. The 85-264 V AC or 88-300 V DC input range allows use across varied industrial networks, including environments powered by centralised rectifiers. The inrush current limited to 63 A over roughly 1 ms helps reduce stress on protection devices at power-up. The typical 20 W power dissipation simplifies thermal assessment in the cabinet, in line with the manufacturer's ventilation recommendations.

Redundancy is supported by design for architectures that require it, securing automation system power in case of a module failure. Power diagnostics and status can be integrated at the installation level using standard instrumentation and supervision practices. This module does not implement communication protocols like a network device or a drive; its role is strictly to supply the low voltages necessary for CPU and I/O operation. For maintenance, the mechanical footprint 50 × 290 × 217 mm eases planned replacement, and range compatibility reduces risks during interventions on existing installations.

Availability and warranty

Standard Exchange Industry offers the reference 6ES7407-0KR02-0AA0 as refurbished units and exchange stock, bench-tested and covered by a warranty. Shipping is provided within 24 to 72 hours to many countries to minimise production downtime. Our technical team supports you to verify that the 10 A rating suits your S7-400 drawer population, assess the need for redundancy and, if necessary, organise a repair of faulty modules. For environments combining variable frequency drives, servo drives and numerical control equipment, we check overall compatibility and the coherence of the 5 V DC and 24 V DC supplies. Selecting this PS407 power supply ensures technical continuity with the SIMATIC S7-400 range and controlled commissioning in line with your internal procedures.