Siemens 6ES5955-3LF12 SIMATIC S5 Power Supply 115/230VAC 5VDC 40A

Siemens 6ES5955-3LF12 SIMATIC S5 Series 955 Power Supply Unit with 115/230VAC 5VDC 40A

1. Product Overview
The Siemens 6ES5955-3LF12 is an original power supply unit for the SIMATIC S5 series, specifically designed for CC 135U/150U/155U and EU 185U racks. It stably converts 115/230 V AC industrial power into a 5 V DC output at 40 A, providing continuous, interference-free power to all S5 PLC modules, ensuring long-term, reliable operation of the entire automation system.

2. Key Features
• Wide input voltage: Supports 115 V and 230 V AC switching, adapting to global power grids
• High current output: 5 V DC 40 A, meeting the needs of high-power expansion racks
• Integrated short-circuit, overload, and overtemperature protection, with automatic recovery to reduce downtime
• Metal housing with forced air cooling, capable of full-load operation at 50°C
• Modular rail mounting allows for quick hot-swap maintenance without downtime
• Tested by the manufacturer in Austria, MTBF > 100,000 hours, industrial-grade stability

3. Technical Parameters
Input voltage: AC 115/230 V ±10%, 47–63 Hz
Output voltage: DC 5 V ±3%
Output current: 0–40 A
Ripple & noise: < 50 mVpp
Efficiency: ≥ 82% (typical)
Operating temperature: 0°C … +60°C
Dimensions (W × H × D): 345 × 455 × 116 mm
Net Weight: Approximately 5.2 kg
Certifications: CE, cULus, FM, ATEX (Zone 2)

4. Compatibility and Applications
• Compatible with SIMATIC S5-135U/150U/155U Central Racks and EU-185U Expansion Racks
• Typical Applications: Automotive production lines, chemical process control, energy management, warehousing and logistics, and other applications requiring 24/7 continuous operation for legacy system upgrades or spare parts replacements

5. Product images

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