SIEMENS 6EP1437-2BA20 — 40A Stabilized DC Power Supply | SITOP PSU300S Series
Engineering Background
The SITOP PSU300S series represents Siemens’ flagship three-phase industrial power supply platform, engineered for demanding continuous-duty applications in process automation, machine building, and critical infrastructure. The 6EP1437-2BA20 delivers a regulated 24 VDC / 40 A output — 960 W of clean, stable DC power — from a wide-range three-phase AC input, making it the preferred choice for high-current 24 V bus architectures in SIMATIC S7, PCS 7, and third-party PLC panels.
Product Positioning
Konmask.com stocks the 6EP1437-2BA20 as a verified OEM unit sourced through authorized industrial distribution channels. Every unit undergoes incoming inspection against Siemens factory documentation before dispatch. This listing is intended for procurement engineers, panel builders, and MRO buyers who require traceable, specification-compliant hardware with short lead times.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Siemens Order Number | 6EP1437-2BA20 |
| Product Family | SITOP PSU300S |
| Input Voltage (AC) | 400 – 500 V AC (3-phase, 3-wire + PE) |
| Input Frequency | 47 – 63 Hz |
| Input Current (typical) | ≤ 4.5 A at 400 V AC / 40 A load |
| Output Voltage (DC) | 24 V DC (adjustable 22.8 – 26.4 V) |
| Output Current (rated) | 40 A |
| Output Power | 960 W |
| Output Ripple & Noise | < 150 mV peak-to-peak (20 MHz BW) |
| Efficiency (typical) | ≥ 93 % at full load |
| Power Factor Correction | Active PFC, λ ≥ 0.99 |
| Hold-up Time | ≥ 20 ms at full load |
| Inrush Current Limiting | Electronic soft-start |
| Overload / Short-circuit | Hiccup mode, auto-restart |
| Overvoltage Protection | Latching shutdown, manual reset |
| Signaling Output | Floating relay contact (DC OK), 24 V / 0.5 A |
| Parallel Operation | Yes — redundancy & power boost (with SITOP diode modules) |
| Mounting | DIN rail (EN 60715 TH35) or screw mounting |
| Dimensions (W × H × D) | 80 × 125 × 145 mm |
| Weight | approx. 3.6 kg |
| Operating Temperature | −25 °C to +70 °C (derating above 60 °C) |
| Storage Temperature | −40 °C to +85 °C |
| Relative Humidity | 5 – 95 % RH (non-condensing) |
| Protection Class | IP20 (IEC 60529) |
| Pollution Degree | 2 |
| Certifications | CE, UL 508, cULus, GL, ATEX Zone 2, IECEx |
| EMC Compliance | EN 61000-6-2 (immunity), EN 61000-6-4 (emission) |
| MTBF | > 500,000 h (IEC 61709, 40 °C) |
Proven Application Environments
- SIMATIC S7-300 / S7-400 / S7-1500 control panels — primary 24 V bus supply for CPU, I/O racks, and HMI
- PCS 7 DCS cabinets — redundant PSU configurations with SITOP UPS modules
- Automotive body-shop lines — high-cycle servo and pneumatic valve power rails
- Water & wastewater SCADA panels — continuous-duty, wide-temperature outdoor enclosures
- Oil & gas wellhead RTU panels — ATEX Zone 2 certified installations
- Pharmaceutical cleanroom automation — low-ripple supply for sensitive analytical instruments
- Railway trackside signaling — GL-certified rolling stock and infrastructure applications
Engineering Advantages
- Active PFC (λ ≥ 0.99) — minimizes harmonic distortion on the plant power network; compliant with IEC 61000-3-2 Class A
- ≥ 93 % efficiency — reduces heat dissipation in sealed enclosures; extends MTBF of adjacent components
- 20 ms hold-up — bridges micro-interruptions without triggering PLC CPU faults or I/O resets
- Parallel-capable architecture — N+1 redundancy or current-boost configurations without external load-sharing modules
- Floating DC OK relay — direct wiring to PLC digital input for predictive maintenance integration
- Wide input range (400–500 V AC) — single SKU covers European, Asian, and Middle Eastern grid standards
- DIN rail + screw mount — flexible panel integration; no adapter plate required
System Architecture & Signal Flow
The 6EP1437-2BA20 employs a three-stage power conversion topology:
- EMC Input Filter + Soft-Start — suppresses conducted emissions; limits inrush to < 30 A peak
- Active PFC Boost Stage — shapes input current to near-unity power factor; generates regulated ~400 V DC bus
- LLC Resonant DC/DC Stage — high-frequency isolation transformer; tight output regulation ±1 % across full load and line range
The DC OK relay closes within 20 ms of output reaching 90 % of set voltage, providing a clean “power good” signal to the PLC CPU. On overload, the unit enters hiccup mode (off-time ≈ 500 ms) to protect wiring and downstream devices while allowing automatic recovery once the fault clears.
Sourcing & Quality Verification
- OEM Origin: Siemens AG, manufactured in Germany / China (Siemens-controlled facility)
- Traceability: Each unit ships with Siemens factory label, date code, and serial number intact
- Incoming Inspection: Visual inspection, label verification, and functional power-on test performed by Konmask technical staff
- Packaging: Original Siemens retail carton or equivalent ESD-safe packaging with foam insert
- Documentation: Siemens product datasheet and EU Declaration of Conformity available on request
- Warranty: 12-month Konmask warranty against manufacturing defects; DOA replacement within 7 business days
Procurement Process
- Confirm quantity & delivery timeline — contact support@konmask.com or use the live chat for real-time stock check
- Request quotation — volume pricing available for orders ≥ 3 units; OEM project pricing on request
- Place order — secure checkout via Shopify Payments, T/T bank transfer, or PayPal
- Dispatch — in-stock units ship within 1–2 business days via DHL Express, FedEx, or SF International
- Customs & documentation — commercial invoice, packing list, and HS code 8504.40 provided; Form E / CO available for eligible destinations
Technical FAQ
Q: Can two 6EP1437-2BA20 units be paralleled for 80 A output?
A: Yes. Use Siemens SITOP diode decoupling modules (e.g., 6EP1961-2BA11) to balance current sharing and prevent reverse feed. Both units must be set to identical output voltage.
Q: Is this unit compatible with SITOP UPS modules?
A: Yes. The 24 V output is fully compatible with SITOP UPS1600 (6EP4134-3AB00-0AY0) and UPS500S series for battery-backed redundancy.
Q: What is the derating curve above 60 °C?
A: Output current must be linearly derated from 40 A at 60 °C to 0 A at 70 °C (i.e., −4 A/°C). Ensure adequate enclosure ventilation above 60 °C ambient.
Q: Does the unit require neutral (N) connection?
A: No. The 6EP1437-2BA20 accepts 3-phase 3-wire (L1, L2, L3 + PE) without neutral, simplifying wiring in industrial panels.
Q: What is the replacement / cross-reference for the discontinued 6EP1437-2BA10?
A: The 6EP1437-2BA20 is the direct successor with identical form factor, improved efficiency, and active PFC. It is a drop-in replacement.
Q: How do I verify authenticity of the unit received?
A: Scan the Siemens DataMatrix code on the product label using the Siemens Industry Online Support app or verify the serial number at support.industry.siemens.com.
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