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P127ALSTOM

The Alstom P127 is a high-reliability, redundant power supply unit designed for critical railway signaling systems. As part of Alstom's advanced power solutions portfolio, it delivers stable, regulated DC power to vital trackside and onboard equipment, ensuring uninterrupted operation in demanding rail environments.

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Key Features
1. Robust Power Conversion
Input: 85–264V AC / 18–36V DC (auto-ranging)

Output: 24V DC (±1% regulation), up to 20A continuous

Redundant hot-swappable modules (N+1 configuration)

2. Railway-Specific Safety
EN 50155 certified (railway electronic equipment)

SIL2 compliant (EN 50126/8/9)

Galvanic isolation (3kV input-output)

3. Smart Monitoring & Protection
Real-time voltage/current monitoring

Active PFC (Power Factor Correction) >0.95

Protections: Overvoltage, short-circuit, overtemperature

4. Ruggedized Design
-40°C to +70°C operation (EN 50155 Class TX)

EN 61373 vibration/shock resistant

IP54 enclosure (dust & splash proof)

Technical Specifications
Parameter Specification
Model P127 (P127ALSTOM variant)
Efficiency ≥92% (at full load)
Ripple Noise <1% p-p
MTBF >300,000 hours
Cooling Convection/forced air
Communication RS-485/Modbus RTU (optional)
Applications
✔ Trackside signaling (interlockings, axle counters)
✔ Level crossing power systems
✔ Onboard train control units (TCR, ATP)
✔ ERTMS/ETCS equipment power backup

Benefits
✅ Ultra-Reliable – Redundant design ensures 24/7 operation
✅ Energy Efficient – Low power loss with active PFC
✅ Easy Maintenance – Front-access modules & LED diagnostics
✅ Global Compliance – Meets UIC, IEEE, and regional standards