Current Regulator Calling On, ‘A’ Marker, ‘AG’ Marker
RDSO / Spec No.
RDSO/SPN/153/2011
Application
Indian Railways (S&T Sector) - Auxiliary & Subsidiary Railway Signalling Aspects
Product Specifications & Details
The Current Regulator Calling On, ‘A’ Marker, and ‘AG’ Marker LED Signal Units manufactured by General Auto Electric Corporation (GAEC) provide essential subsidiary and marker signaling across Indian Railways. Compliant with RDSO Specification No. RDSO/SPN/153/2011, these 110V AC units feature an integrated current regulator, phantom-free design, and high-durability UV-stabilized lenses. Engineered for RE and NON-RE installations, they integrate seamlessly with SSI, Relay Interlocking, and Electronic Interlocking (EI) platforms while maintaining fail-safe performance.
Key System Features
- Integrated Current Regulator: Built-in regulation ensures steady illumination across voltage fluctuations.
- Visibility Range: Minimum visibility distance of 200 meters in clear daylight; visible at the foot of the signal.
- Fail-Safe Architecture: Phantom-free layout with multi-array LED design for high operational safety.
- Lamp Proving Compatibility: Works with Signal Exchange Relays (ECR) and Electronic Interlocking (EI).
- Signal Variations: Available in YELLOW (Calling ON) and WHITE (‘A’ Marker and ‘AG’ Marker).
- RDSO Approved: Fully certified under RDSO Lucknow for RE and NON-RE railway tracks.
Technical Specifications Table
| Parameter | Calling ON Aspect | ‘A’ Marker / ‘AG’ Marker |
|---|---|---|
| Color of the Unit | YELLOW | WHITE |
| Power Supply & Variation | 110V AC Built-in Current Regulator | ± 20% Variation (88V to 132V) | |
| Input Current & Load Reg | 150 mA (RMS) +10% -20% | Load Regulation: ± 2% (88V to 132V) | |
| Illumination & Dispersion | 45-70 Lux | Dispersion: 4° to 10° | Min 50 Lux (No stencil in front of LED) |
| Color Co-Ordinates | Class ‘B’ of BS 1376/1974 | Class ‘C’ of BS 1376/1974 |
| Display Area & LED Count | 125 mm dia ± 1 mm | Min. 30 LEDs | |
| Operating Temperature | -10°C to +70°C (RH UPTO 95%) | |
| Isolation & Insulation Level | Isolation: 1.5 KV AC (RMS) for 1 min | Insulation: > 100 MΩ | |
| Off Voltage, Detection & Weight | Guaranteed Off Voltage: Below 60V AC | Failure Detect: < 50% nominal light | Weight: 1.5 Kg | |
Note on Specification Coverage
* A/AG and other specific marker signals operate on similar optical standards but may have localized application guidelines outside standard main aspect RDSO coverage.
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RDSO/SPN/153/2011 (Reference Specification)*
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