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Description
The Siemens 6ES5955-3LF11 is a high-capacity power supply module engineered for the SIMATIC S5-135U, S5-150U, and S5-155U programmable controller systems, as well as the EU 185U expansion units. Designed for demanding industrial environments, this unit provides a stable 5 VDC output at 40 A, ensuring reliable operation for high-density I/O configurations and critical automation logic. Its robust design is built to withstand the rigors of heavy manufacturing, power generation, and chemical processing facilities, providing a consistent power foundation that helps prevent unplanned downtime.
Features
- Designed for seamless integration with S5-135U, 150U, and 155U central controllers.
- Switchable input voltage capability (115 VAC / 230 VAC) for global industrial compatibility.
- High-current output of 40 A at 5 VDC to support fully populated controller racks.
- Integrated interface for external battery backup (CA-6EW1000-7AA) to preserve non-volatile memory and internal clock data during power outages.
- Rack-mount form factor for secure installation in standard S5 cabinets.
Technical Specifications
| Model |
6ES5955-3LF11 |
| Manufacturer |
Siemens |
| Input Voltage |
115 VAC / 230 VAC (switchable) |
| Output Capacity |
5 VDC / 40 A |
| Compatibility |
SIMATIC S5-135U, S5-150U, S5-155U, EU 185U |
| Operating Temperature |
0 to 60 deg C |
Installation Guidelines
- Ensure the power supply is installed in a clean, dry environment with adequate ventilation to maintain operating temperatures within the 0 to 60 deg C range.
- Verify that the input voltage selector switch is set correctly for your local power grid (115 VAC or 230 VAC) before applying power.
- Always power down the rack and disconnect the main input supply before installing or removing the module to prevent electrical damage.
- Ensure the module is securely seated in the rack and that all backplane connections are fully engaged.
- When using the external battery backup, ensure the battery is correctly oriented in the external holder to prevent data loss.
FAQ
Does this power supply include the backup battery?
No, the module provides the interface for the external battery (CA-6EW1000-7AA), which must be sourced separately and installed in the designated external holder.
Is this module compatible with S5-115U systems?
No, this specific power supply is designed for the larger S5-135U, S5-150U, and S5-155U controller series. Please verify your controller model before installation.
