Siemens 6ES5955-3NC41 S5 PLC Power Supply Module | Replacement, Equivalent & Selection Guide
The Siemens 6ES5955-3NC41 is a power supply module designed for the SIMATIC S5 programmable logic controller (PLC) series. This page provides full technical specifications, compatible replacement options, equivalent models, and a practical selection guide to help engineers and procurement teams make informed decisions.
Technical Specifications
- Part Number: 6ES5955-3NC41
- Manufacturer: Siemens
- Series: SIMATIC S5
- Module Type: Power Supply Module (PS)
- Input Voltage: AC 120/230 V (switchable)
- Output Voltage: DC 5 V / 24 V
- Mounting: S5 rack-compatible
- Weight: 5.72 kg
- Condition: New / Refurbished / Exchange available
- Origin: Germany
Compatible Replacement & Equivalent Models
When the 6ES5955-3NC41 is unavailable or discontinued, the following models may serve as functional equivalents depending on your system configuration. Always verify electrical and mechanical compatibility before substitution.
- 6ES5955-3NA41 – S5 power supply, lower output rating variant
- 6ES5955-3NB41 – Mid-range S5 PS, compatible rack form factor
- 6ES5955-3LC41 – Alternative S5 PS with similar I/O specs
- 6ES5955-3LF41 – Extended temperature range variant
- Third-party S5-compatible PSUs – Consult Konmask for vetted alternatives
Note: Cross-referencing must be validated against your specific S5 rack model and load requirements.
Why Choose the Original 6ES5955-3NC41
- ✅ OEM-certified compatibility with SIMATIC S5 racks (S5-115U, S5-135U, S5-155U)
- ✅ Proven field reliability in continuous industrial environments
- ✅ Siemens firmware & diagnostics integration via STEP 5 / STEP 7
- ✅ Stable DC output with built-in overload and short-circuit protection
- ✅ Long service life with Siemens-grade components
Typical Applications
- Manufacturing automation lines (automotive, food & beverage, packaging)
- Process control systems in chemical and petrochemical plants
- Power distribution and motor control centers
- Legacy S5 system maintenance and life extension projects
- Machine tool and CNC controller power supply replacement
System Compatibility
- Compatible Racks: SIMATIC S5-115U, S5-135U, S5-155U
- Programming Software: STEP 5, STEP 7 (via S5/S7 migration tools)
- Bus Interface: S5 backplane bus
- Not compatible with: SIMATIC S7-300/400/1200/1500 series (different form factor and bus)
Selection Guide
Use the following criteria to determine if the 6ES5955-3NC41 is the right module for your application:
- Step 1 – Identify your rack: Confirm your S5 rack model (S5-115U / 135U / 155U)
- Step 2 – Check load requirements: Calculate total DC 5 V and 24 V current draw from all installed modules
- Step 3 – Verify input voltage: Confirm site supply is AC 120 V or 230 V and set the selector switch accordingly
- Step 4 – Assess replacement need: If replacing a failed PS, match the suffix code (3NC41) to ensure output capacity equivalence
- Step 5 – Contact Konmask: For cross-reference validation or alternative sourcing, contact our technical team
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified industrial surplus channels
- Pre-shipment functional testing and visual inspection performed
- Traceability documentation available on request
- Packaging: anti-static, foam-protected, export-grade carton
- Lead time: typically 3–7 business days (stock-dependent)
How to Order
- Add the Siemens 6ES5955-3NC41 to your cart directly on this page
- Or contact us with your quantity, required condition (new / refurbished), and delivery timeline
- For bulk orders (>5 units), request a volume quote via email
- We accept T/T bank transfer, PayPal, and major credit cards
📧 [email protected] | 📞 +0086 19859288691
Replacement & Compatibility FAQ
Q: Is the 6ES5955-3NC41 still in production?
A: This model is part of the legacy SIMATIC S5 line. Siemens has officially discontinued S5 series production; however, new-old-stock (NOS) and refurbished units remain available through specialist distributors like Konmask.
Q: Can I replace it with an S7 power supply?
A: No. S7-series power supplies use a different form factor and bus interface and are not directly interchangeable with S5 racks.
Q: What is the difference between 3NC41 and 3NB41?
A: The suffix codes indicate different output current ratings. The 3NC41 typically provides higher output capacity. Always verify against your rack’s load calculation.
Q: Do you provide a warranty?
A: Yes. Konmask provides a 90-day functional warranty on all tested units. Extended warranty options are available on request.
Q: Can you help with S5 to S7 migration?
A: Yes. Contact our team for migration consultation and compatible S7 replacement recommendations.
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Contact: [email protected] | +0086 19859288691
