LED Signal Unit for Subsidiary Aspect – A Marker with Built-in Current Regulator
RDSO / Spec No.
RDSO/SPN/153/2011 (Reference Specification)*
Application
Indian Railways (S&T / Railway Signalling) - Subsidiary Aspect & Marker Signalling
Product Specifications & Details
The LED Signal Unit for Subsidiary Aspect – A Marker is a high-reliability, fail-safe lighting solution engineered specifically for modern railway signalling systems. Featuring a built-in current regulator, multi-array LED layout, and phantom-free design, it provides a bright, clear WHITE signal indication with exceptional visibility up to 200 meters. Compatible with both Relay Interlocking and Solid State Interlocking (SSI) systems in RE and Non-RE areas, this unit drastically lowers operating and maintenance costs while ensuring continuous lamp-proving compatibility.
*Specification Disclaimer: While designed in alignment with the general standards of RDSO/SPN/153/2011 for railway LED signaling units, please note that Marker signals (such as A Marker and AG Marker) fall outside the direct scope of RDSO approval certification under this spec.
Key System Features & Capabilities
- Built-in Current Regulator: Integrated regulation unit designed for stable 110V AC supply operation with ±20% input variation handling.
- Phantom Free & Multi-Array Design: Eliminates false optical indications caused by sunlight reflection; multi-LED layout ensures failsafe redundancy.
- Fail-Safe & ECR Proving: Compatible with Signal Lamp Proving Relays (ECR) and Electronic Interlocking (EI) diagnostic systems.
- High Visibility & UV Protection: UV-stabilized lens offers a minimum 200m visibility range in bright daylight and short-range driver-foot visibility.
- Low Power Consumption: Solid-state LED architecture reduces energy load and field maintenance requirements.
- LED Failure Detection: Automated failure detection triggers before overall light output drops below 50% of nominal rating.
Key Technical Specifications
| Parameter | A Marker Specification |
|---|---|
| Aspect Name / Signal Colour | A Marker / Clear WHITE (Class ‘C’ of BS 1376/1974) |
| Operating Voltage / Current | 110V AC (88V to 132V input range) | 150 mA (RMS) +10% / -20% |
| Load Regulation | ± 2% (across 88V to 132V range) |
| Display Area & Illumination | 125 mm ± 1 mm | Min 50 Lux (without stencil) | 4° to 10° dispersion angle |
| LED Count & Guaranteed Off Voltage | Minimum 30 LEDs | Guaranteed OFF below 60V AC |
| Dielectric & Insulation Protection | Isolation: 1.5 kV AC (RMS) for 1 min | Insulation: > 100 MΩ |
| Operating Temperature / RH | -10°C to +70°C | Relative Humidity up to 95% |
| Unit Weight | Approx. 1.5 Kg |
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