Siemens 6ES7407-0RA02-0AA0 SIMATIC S7-400 PS 407 20 A Power Supply
01Overview
Siemens 6ES7407-0RA02-0AA0 is the PS 407 wide-range power supply for SIMATIC S7-400 racks. It accepts 120/230 V AC or DC sources across the documented input ranges and delivers 5.1 V DC at 20 A to the S7-400 backplane plus a short-circuit-protected 24 V DC output at 1 A. The module includes monitoring and power-failure buffering for the automation system, making input selection, rack load and backup arrangements critical engineering checks.
02Specs
| Manufacturer | Siemens |
|---|---|
| Article Number | 6ES7407-0RA02-0AA0 |
| Product Designation | PS 407 20 A |
| Automation System | SIMATIC S7-400 |
| Rated Input | 120/230 V AC or DC |
| Permissible AC Input | 85 to 264 V AC |
| Permissible DC Input | 88 to 300 V DC |
| Line Frequency | 50/60 Hz; permissible 47 to 63 Hz |
| Backplane Output | 5.1 V DC, 20 A |
| Auxiliary Output | 24 V DC, 1 A |
| Output Protection | Short-circuit protected |
| Power-Failure Buffering | More than 20 ms |
| Typical Active Power Input | 158 W |
| Typical Power Loss | 35 W |
| Commercial Status | Active product |
03Features
Key Functions
- Wide-range AC or DC input supports the documented S7-400 supply arrangements.
- The 5.1 V DC, 20 A output powers the rack backplane without a required base load.
- A separate 24 V DC, 1 A output supports the documented auxiliary use and is idle-proof.
- Short-circuit protection is provided for both output circuits.
- Power-failure buffering exceeds 20 ms under the documented conditions and follows the NAMUR NE21 requirement.
- Status monitoring supports rapid diagnosis of supply and backup conditions.
Product Identity
- Manufacturer: Siemens
- Model: 6ES7407-0RA02-0AA0
- Product Type: SIMATIC S7-400 PS 407 wide-range power supply
- Status: Active product
04Applications
- Powering higher-load SIMATIC S7-400 rack configurations within the approved current budget.
- Control cabinets with either AC or DC sources inside the permitted wide-range input window.
- Service replacement of an existing PS 407 20 A module with the same electrical design.
- S7-400 stations requiring the additional 24 V DC auxiliary output.
- Automation systems that rely on the documented short power-failure hold-up.
- Engineered redundant or backup arrangements using supported S7-400 hardware and wiring.
05Lifecycle
- Siemens identifies the exact PS 407 article as an active product.
- Calculate the complete rack current demand before selecting the 20 A power supply.
- Verify AC or DC input type, voltage range, protective devices, grounding and conductor sizing.
- Review the installed backup-battery arrangement and maintenance procedure without assuming battery details from another PS 407 variant.
- After replacement, check both outputs, rack startup, current loading, alarms, buffering and all CPU diagnostics.
06FAQ
What is Siemens 6ES7407-0RA02-0AA0?
It is the PS 407 wide-range 20 A power supply for SIMATIC S7-400 racks.
Can the module use either AC or DC input?
Yes. It accepts the documented 120/230 V AC or DC ratings within the specified permissible voltage ranges.
What is the main backplane output?
The module supplies 5.1 V DC at up to 20 A to the S7-400 backplane.
Is a 24 V output available?
Yes. A short-circuit-protected 24 V DC output rated at 1 A is provided.
How long is the documented power-failure hold-up?
The official technical data specifies more than 20 ms under the applicable operating conditions.
What must be checked after exchange?
Verify input selection, protective wiring, 5.1 V and 24 V outputs, rack load, alarms, buffering and CPU startup diagnostics.
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