6ES7405-0KA01-0AA0 - Power Supply Module - SIEMENS

SIEMENS PS 405 Power Supply 6ES7405-0KA01-0AA0 - SIMATIC S7-400

The PS 405 power module, part number 6ES7405-0KA01-0AA0, integrates with programmable controllers in the SIMATIC S7-400 range to provide a stable, secure power supply to the CPU and backplane-connected modules. Designed for demanding production environments, it accepts 24/48/60 V DC inputs and delivers two separate rails: 5 V DC for controller logic and 24 V DC for auxiliaries, with built-in short-circuit protection and a 20 ms hold-up time for brief supply interruptions. Its FM rating up to 40°C (class T4) and the primary/secondary potential separation contribute to risk management. The unit occupies 2 slots on the S7-400 rack, with connections via 3 x 1.5 mm² cables and a protective conductor, in protection class I. An optional backup battery can be fitted to increase availability according to application needs.

Technical specifications

• Manufacturer part number : 6ES7405-0KA01-0AA0
• Range : SIMATIC S7-400, PS 405 power supply
• Manufacturer : SIEMENS
• Type : Power module for S7-400 rack, wide DC input range
• Input voltage : 24 V DC, 48 V DC or 60 V DC
• 5 V output : 5 V DC, 10 A for controller logic and backplane
• 24 V output : 24 V DC, 1 A for auxiliaries
• Typical active power : 104 W, losses 29 W
• Protection : integrated short-circuit protection, 20 ms hold-up
• Compliance : FM up to 40°C, class T4
• Dimensions : 50 mm x 290 mm x 217 mm
• Weight : 1400 g
• Connection : 3 x 1.5 mm² cables with protective conductor
• Protection class : I, with PE
• Isolation : primary/secondary potential separation
• Rack occupancy : 2 slots on S7-400 chassis
• Optional backup battery : 2 x lithium AA 3.6 V, 1.9 Ah

Overview of the SIMATIC S7-400 range

The SIMATIC S7-400 series is intended for large-scale automation architectures, with high availability requirements and strong modularity. PS 405 power supplies ensure system energy stability by providing regulated DC voltages to the backplane and associated equipment. They integrate natively into the mechanical format of S7-400 racks and meet the electrical safety constraints typical of industrial environments. The 6ES7405-0KA01-0AA0 reference belongs to the wide-range DC input variants, suitable for installations powered by continuous DC networks or intermediate conversion systems.

• Dedicated S7-400 power modules : distribution of 5 V for logic and 24 V for auxiliaries, with nominal capacities sized for standard system configurations.
• Continuity options : integrated 20 ms hold-up and optional backup battery to increase tolerance to brief power interruptions depending on the controller architecture.

This product family consistency simplifies maintenance and sourcing across installed bases while ensuring mechanical and electrical compatibility with existing SIMATIC chassis and modules.

Industrial applications

The 6ES7405-0KA01-0AA0 power module is intended for maintenance managers, integrators and control engineers operating S7-400 systems in constrained environments. It powers CPUs, I/O modules and communication cards, ensuring PLC cycle stability during rapid supply variations. Its 24/48/60 V DC input range makes it suitable for architectures fed by DC buses, battery systems or rectifiers.

• Continuous and batch processes : chemical, food, pharmaceutical industries where resilience to micro-interruptions supports batch quality.
• Infrastructure and utilities : water treatment, industrial HVAC, power generation and distribution.
• Discrete manufacturing : assembly lines, conveyors, packaging, requiring a stable 5 V logic supply.
• Environments with DC networks : sites with centralized DC supply, inverters or hybrid sources.
• Retrofit of installed base : like-for-like replacement of faulty PS 405 power supplies without chassis modification.

Integration and communication

Integration is performed directly on the S7-400 rack occupying 2 slots. The primary connection uses 3 x 1.5 mm² conductors with protective conductor, compliant with protection class I. The potential separation between primary and secondary contributes to electrical safety and robustness against common-mode disturbances. The 5 V 10 A and 24 V 1 A outputs are available for logic and auxiliaries according to Siemens' configuration for the S7-400 family.

Short-circuit protection and the 20 ms hold-up reduce unexpected stops caused by supply instabilities. An optional backup battery can be installed to complement service continuity according to site practices. No software configuration is required, as the unit is a dedicated backplane power module for S7-400. Thermal performance and FM compliance up to 40°C support controlled operation in industrial environments.

Availability and warranty

The SIEMENS power module 6ES7405-0KA01-0AA0 is offered by Standard Exchange Industry as refurbished or exchange units, bench-tested and supplied with warranty. Shipping within 24 to 72 hours depending on availability, with technical support for reference identification and compatible alternatives in the SIMATIC S7-400 range. In case of failure or obsolescence, our team will recommend the most suitable solution—supply, repair or exchange—to minimize your line downtime.