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 |
Related Products
More equipment from Signalling Products
RDSO/SPN/153/2011 (Reference Specification)*
LED Signal Unit for Subsidiary Aspect – A Marker with Built-in Current Regulator
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 […]
RDSO/SPN/199/2010
LED Signal Unit for Main Aspect With Integrated Current Regulator
The LED Signal Unit for Main Aspect manufactured by General Auto Electric Corporation (GAEC) delivers high-reliability optical signaling for modern railway and metro networks. Designed in accordance with RDSO Specification No. RDSO/SPN/199/2010, this 110V AC-fed unit features a built-in current regulator, a phantom-free multi-array LED layout, and UV-stabilized lenses for harsh outdoor conditions. It is […]
RDSO/SPN/153/2011
LED Signal Unit for Subsidiary Aspect Route Signal with Built in Current Regulator
The LED Signal Unit for Subsidiary Aspect Route Signal manufactured by General Auto Electric Corporation (GAEC) is engineered for high-reliability route indication across railway networks. Compliant with RDSO Specification No. RDSO/SPN/153/2011, this 110V AC-fed LED lighting unit features an integrated current regulator, phantom-free multi-array arrangement, and UV-stabilized lenses for rugged outdoor performance. Compatible with Solid […]