Siemens 6ES7405-0DA02-0AA0 PS 405 Power Supply

Reliable Power Delivery for S7-400 Systems

This power supply module provides stable 24 V DC power to S7-400 PLC systems. It converts AC mains voltage into regulated DC power for reliable operation. Many plants rely on this unit for consistent system performance. The module incorporates comprehensive protection features for equipment safety.

Technical Specifications

Parameter	Specification
Model	6ES7405-0DA02-0AA0
Dimensions	25 mm × 290 mm × 217 mm (W × H × D)
Weight	0.80 kg
Input Voltage	120/230 V AC (switchable)
Input Frequency	50/60 Hz (automatic detection)
Input Current	0.8 A at 230 V AC, 1.6 A at 120 V AC
Output Voltage	24 V DC
Output Current	5 A continuous
Output Power	120 W
Efficiency	≥ 88% at full load
Hold-Up Time	≥ 20 ms at full load
Output Protection	Overvoltage protection, short-circuit protection, overload protection
Isolation Voltage	1,500 V AC (input-to-output)
Status Indicators	1 Power LED (green), 1 Overload LED (red)
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Humidity Range	5% to 95% RH (non-condensing)
Protection Class	IP20
Certifications	CE, UL, cULus, CSA

Input Power Configuration

The module accepts either 120 V or 230 V AC mains voltage. A manual selector switch sets the correct input range easily. Automatic frequency detection handles 50 Hz and 60 Hz power grids. This flexibility enables global installation without modification.

Output Specifications and Load Capacity

The unit delivers 5 A continuous current at 24 V DC to the backplane. Output power reaches 120 W for typical S7-400 configurations. Hold-up time of 20 milliseconds covers brief power interruptions. This capacity supports medium-sized PLC racks with I/O modules.

Protection Features and System Safety

Overvoltage protection safeguards connected modules from excessive voltage. Short-circuit protection prevents damage from wiring faults on the output. Overload protection triggers shutdown during excessive current draw. These features ensure operator and equipment safety in all conditions.

Efficiency and Thermal Management

Efficiency reaches 88% at full load for reduced energy consumption. Higher efficiency lowers heat generation within the control cabinet. The module dissipates heat through its integral heatsink design. This thermal management enhances long-term reliability of the power supply.

Mechanical Construction and Physical Attributes

This supply measures 25 mm wide with a total weight of 0.80 kg. The slim profile conserves valuable rack space in systems. Screw-type terminals connect mains input and output wiring. Installation uses the S7-400 backplane for mechanical support.

Status Indication and Diagnostic Feedback

A green LED confirms the presence of output voltage. A red LED illuminates during overload or overvoltage conditions. Operators can quickly assess power status from the front panel. This indication helps identify power-related issues rapidly.

Certifications and Compliance

The 6ES7405-0DA02-0AA0 holds CE, UL, cULus, and CSA certifications. These approvals confirm compliance with international safety standards. Each unit undergoes comprehensive testing before shipment. This quality assurance ensures reliable power delivery in critical systems.