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Reliable Power Delivery for SIMATIC S5 Systems
The Siemens 6ES5955-3NF11 power supply unit provides stable DC power for S5-95U programmable controllers and their expansion modules. This unit converts AC mains voltage into regulated 24V DC output for consistent system operation. It incorporates comprehensive protection features, including overvoltage and short-circuit safeguards.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES5955-3NF11 |
| Series | SIMATIC S5 |
| Product Type | Power Supply Unit |
| Input Voltage | 120/230V AC (selectable), 50/60Hz |
| Output Voltage | 24V DC |
| Output Current | 1A |
| Output Power | 24W |
| Efficiency | Approx. 80% |
| Voltage Tolerance | ±3% |
| Residual Ripple | < 50 mVpp |
| Protection Features | Overvoltage, short-circuit, and overload protection |
| LED Indicators | 1 x green “24V OK” |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to +85°C |
| Weight | 0.7 kg |
| Dimensions (W x H x D) | 80 x 120 x 110 mm |
| Protection Rating | IP20 |
Robust Protection Mechanisms
The Siemens 6ES5955-3NF11 features comprehensive fault protection for safe system operation. The unit automatically shuts down during overvoltage conditions to prevent damage to connected PLC modules. It also handles short-circuit events gracefully, resuming normal operation once the fault clears. The overload protection ensures reliable power delivery even under varying load demands.
Integration and Compatibility
This power supply directly mounts onto the S5-95U base unit without requiring additional cabling. It supplies power to the CPU and supports up to 32 expansion modules through the backplane bus. The green “24V OK” LED provides a clear visual status indicator for quick troubleshooting.
Thermal Management and Durability
The unit operates efficiently across a wide temperature range of 0°C to 60°C. Its compact 0.7 kg design simplifies installation in standard control cabinets. The built-in cooling concept allows continuous operation without external fans in most configurations.
Application Versatility
This power supply serves as the primary energy source for S5-95U automation systems in various industries. It supports applications ranging from packaging machinery to material handling equipment. The selectable input voltage also accommodates both 120V and 230V mains supplies worldwide.