The GEC Alsthom TOG (Model 03820040) is a specialized “Tropic” series voltage relay designed for high-reliability monitoring of 110V DC control circuits in power plants, substations, and harsh industrial environments.
Product Parameters (Datasheet)
- Model: TOG
- Part Number: 03820040
- Rated Voltage: 110V DC
- Series: Tropic (specifically treated for high humidity/temperature)
- Relay Type: Instantaneous or Delayed Voltage Monitoring
- Contact Configuration: Typically 2 Changeover (C/O) or specific multi-contact arrangements
- Enclosure: Compact plug-in or surface mount case (often size 1/2N or similar)
- Burden: Low power consumption to minimize heat within control panels
- Reset Type: Automatic reset once voltage returns to threshold
- Compliance: IEC 60255 or equivalent electrical standards for protective relays
Country of Origin
This relay was originally manufactured by GEC Alsthom (now part of the Alstom/GE grid legacy) in France or the United Kingdom, depending on the specific production batch.
Application Fields
The TOG 03820040 is primarily used in the following sectors:
- Electrical Substations: Monitoring the health of 110V DC battery banks and control buses.
- Railway Infrastructure: Voltage supervision for signaling and trackside control cabinets.
- Power Generation: Used in turbine control panels to ensure auxiliary DC power is stable.
- Tropical/Marine Environments: The “Tropic” designation indicates specialized internal coating to prevent fungus and corrosion in humid climates.
Product Usage Instructions
- Mounting: Ensure the relay is securely seated in its compatible terminal base or rail mount.
- Wiring: Connect the 110V DC sensing lines to the designated input terminals. Observe correct polarity as specified on the side-label diagram.
- Setting: If the unit has an adjustable potentiometer, set the pick-up or drop-out voltage threshold using a calibrated DC power source.
- Testing: Manually simulate a voltage drop to verify that the output contacts switch correctly to trigger alarms or trip circuits.
- Environment: While designed for “Tropic” conditions, ensure the cabinet has adequate ventilation to prevent extreme heat buildup.
Product Technical Description
The GEC Alsthom TOG series is renowned for its “Tropic” build quality, which involves vacuum-impregnating coils and using non-corrosive materials for all mechanical pivots. The 03820040 model specifically targets the 110V DC standard common in global utility grids. It acts as a protective supervisor; if the DC bus voltage falls below a critical level (undervoltage) or exceeds limits, the relay changes state to protect sensitive electronic components and provide a “Power Fail” signal to the SCADA system.
Q&A (Common Questions)
Q: What does the “Tropic” designation actually mean? A: It signifies that the relay components are treated with anti-fungal and anti-corrosive coatings, making it suitable for high-humidity and high-temperature regions (e.g., Southeast Asia, Middle East, South America).
Q: Is this relay compatible with AC voltages? A: No, the 03820040 is specifically designed for 110V DC. Using it on an AC circuit will cause improper operation and potential coil damage.
Q: Can I replace a TOG relay with a modern digital equivalent? A: Yes, many GE Multilin or Schneider MiCOM relays can perform these functions, but the TOG is often preferred for simple “fit-and-forget” legacy replacements without requiring complex software programming.
Q: Does it have a manual reset button? A: Most TOG models are self-resetting, meaning they return to the normal state once the voltage stabilizes, but always check the specific contact logic printed on your unit’s casing.
Similar Model Recommendations
- GEC Alsthom TOG 03820030 (48V DC Variant)
- GEC Alsthom TOG 03820050 (220V DC Variant)
- Alstom MVAA (Multi-contact Auxiliary Relay)
- GEC Alsthom GTT (Timer Relay version)
- GE/Alstom P122 (Modern Digital Voltage Relay)
For procurement or technical support regarding the GEC Alsthom TOG 03820040, please contact our industrial relay specialists.
