LED Signal Unit for Subsidiary Aspect – Calling On with Built-in Current Regulator
RDSO / Spec No.
RDSO/SPN/153/2011
Application
Indian Railways (S&T / Railway Signalling) - Calling On Subsidiary Aspect
Product Specifications & Details
The LED Signal Unit for Subsidiary Aspect – Calling On is an RDSO-approved, high-reliability lighting solution engineered for modern railway signalling systems. Equipped with an integrated current regulator, multi-array LED layout, and phantom-free design, it delivers a clear YELLOW signal indication with guaranteed visibility up to 200 meters. Fully compatible with Relay Interlocking and Solid State Interlocking (SSI) systems in both RE and Non-RE installations, this unit ensures fail-safe performance while drastically reducing operational and maintenance costs.
Key System Features & Capabilities
- Built-in Current Regulator: Internal regulation unit designed for stable 110V AC operation with a wide ±20% input variation handling capacity.
- Phantom-Free Optical Design: Prevents false visual indications caused by sunlight reflections; multi-array structure provides critical fail-safe redundancy.
- RDSO Approved & Interlocking Ready: Fully approved under specification RDSO/SPN/153/2011 for use with SSI and Relay Interlocking setups.
- High Visibility & Durability: UV-stabilized outdoor lens provides minimum 200m daylight visibility and clear driver-foot signal viewing.
- Lamp Proving Compatibility: Seamlessly integrates with Signal Lamp Proving Relays (ECR) and Electronic Interlocking (EI) diagnostics.
- Early Failure Detection: Features built-in failure detection that triggers before total light output drops below 50% of nominal levels.
Key Technical Specifications
| Parameter | Calling On Specification |
|---|---|
| Aspect Name / Signal Colour | Calling ON / YELLOW (Class ‘B’ of BS 1376/1974) |
| Power Supply & Voltage | Built-in current regulator | 110V AC nominal (88V to 132V range) |
| Input Current / Load Regulation | 150 mA (RMS) +10% / -20% | Load Regulation: ±2% (88V to 132V) |
| Display Area & Illumination | 125 mm ± 1 mm | 45–70 Lux | 4° to 10° dispersion angle |
| Guaranteed Off Voltage | 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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