Description
1. Unboxing & Physical Snapshot (Dynamic List)
- Model & Brand: Siemens 6ES5955-3LF11 (SIMATIC S5 Power Supply Unit PS 955)
- Physical Dimensions: Approximately 220mm x 240mm x 180mm (W x H x D)
- Estimated Shipping Weight: 5.5 kg (boxed with heavy-duty molded static-dissipative foam cushioning)
- What’s in the Box: 1x 6ES5955-3LF11 power supply module sealed inside factory protective packaging, pluggable high-current line terminal connectors, protective covers, and original OEM compliance documentation.
2. Product Introduction (Structure A: Environmental Hook)
Harsh industrial floors punish heavy power electronics with continuous thermal stress, high-voltage line transients, and airborne corrosive particulate. Standard commercial power units fracture quickly under these aggressive operating profiles, causing catastrophic facility trips and unannounced continuous-process shutdowns.
Built to endure punishing facility conditions, the Siemens 6ES5955-3LF11 maintains unyielding voltage regulation where less rugged hardware fails. (Chúng tôi frequently pull these high-capacity units from heavy continuous-process control racks, and the internal transformer windings and filtering capacitors remain entirely free of degradation.) Proper thermal management keeps internal switching components operating safely within design thresholds across large-scale S5-135U and S5-155U subracks.
3. Core Technical Specifications
| Parameter | Value |
| System Compatibility | SIMATIC S5-135U / S5-155U central and expansion automation subracks |
| Input Voltage | 120/230V AC autoranging industrial supply lines |
| Output Rails | High-amperage 5V DC logic supply and auxiliary voltage rails |
| Power Dissipation | Optimized heavy-duty thermal output under full continuous load |
| Isolation Voltage | 2kV AC primary-to-secondary galvanic isolation |
| Operating Temperature | 0°C to +55°C (natural convection and integrated cooling profile) |
| Storage Temperature | -40°C to +70°C |
| Diagnostic Indicators | Front-panel LED output voltage, overload, and status monitoring array |
| Mounting Standard | Dedicated left-bay power slot in SIMATIC S5 central subracks |
4. Global Compliance & Industry Certifications
Auditors demand verifiable documentation confirming that legacy power components comply with rigorous electrical safety mandates before plants resume operation.
- Expected Certifications: CE Mark, UL/cUL Listed (Industrial Control Equipment), CSA certification, and VDE conformity.
- Compliance Significance: UL listings verify that internal transformer insulation and high-voltage creepage distances prevent dielectric breakdown during severe grid power surges. (Class I Div 2 ratings ensure zero risk of spark ignition within classified hazardous plant sectors.) Verify specific lot certifications with OEM documentation before closing out compliance audits.
5. Long-Term Storage & Asset Preservation Guide
Warehouse storage destroys unprotected power electronics if humidity and environmental hazards go unmanaged. Keep this asset safe:
- Store the power supply unit sealed tightly inside its original protective packaging to block atmospheric moisture and dust accumulation.
- Maintain warehouse relative humidity strictly below 60% to prevent oxidation on the high-voltage terminal screws and internal filter capacitors.
- Lay the unit flat on static-dissipative foam pads to absorb structural building vibrations and prevent micro-fractures in the heavy printed circuit board substrates.
6. Physical Installation Prerequisites
Proper mechanical placement guarantees longevity and prevents localized overheating inside the heavy-duty cabinet enclosure.
- Convection Clearance: Leave at least 80mm of open space above and below the power supply chassis to permit proper vertical airflow across the high-capacity cooling fins.
- Grounding Protocol: Bond the protective earth (PE) terminal securely to the cabinet grounding busbar using star lock washers to suppress electrical noise and ensure operator safety.
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: Which Harmonized System (HS) code applies to international customs clearance for the 6ES5955-3LF11?
A: This heavy-duty power supply unit typically clears under HS code 8504.40 (Static converters / industrial power supplies), but importers should confirm final classification with their broker according to local rules.
Q: Does this surplus unit come with factory fuse protection installed?
A: New surplus hardware ships equipped with original OEM-rated high-capacity input and output fuses; check your electrical drawings to verify correct sizing before energizing the subrack.
Q: How does the declared Country of Origin (COO) influence international shipping paperwork?
A: The COO—typically Germany for this manufacturing run—dictates preferential duty rates under international trade agreements, making a verified certificate of origin essential for smooth customs processing.
