Overview
The 6GA2-490-0A is a Siemens automatic voltage regulator (AVR) designed for Siemens 1FC6 brushless synchronous generators (series 18-28). It uses a thyristor shunt (subtractive) control principle where excess excitation from the compounding system is dissipated in a shunt resistance.
Key Features
- Siemens Brand — Genuine AVR for 1FC6 generators
- Thyristor Shunt Control (Subtractive Principle)
- Compounding System Compatible
- ±0.5% Voltage Regulation
- Suitable for 1FC6 Series 18-28
Technical Specifications
| Parameter | Value |
|---|---|
| Model | 6GA2-490-0A |
| Brand | Siemens |
| Type | Thyristor Shunt AVR (Subtractive) |
| Voltage Sensing Input | 230VAC (200-240V) or 400VAC (340-480V) selectable |
| Compounding Current | Per phase, isolated |
| AVR Shunt Current | 3A DC continuous (6GA2-490) |
| Max Shunt Current | 4.5A DC intermittent |
| Voltage Adjustment Range | ±5% via internal rheostat |
| Droop Adjustment | 0-0.5A AC via CT |
| External Voltage Adjust | 470Ω-1kΩ rheostat, ±5-10% |
| Regulation Accuracy | <±0.5% (engine variation <4%) |
| Operating Temp | 0°C to +70°C |
| Storage Temp | -45°C to +85°C |
| Relative Humidity | 95% RH non-condensing |
Compatibility
Designed for Siemens 1FC6 brushless synchronous generators series 18-28. Also compatible with Siemens-licensed Hyundai, Uljanik, and Fenxi generator brands.
Why Choose ZenixPower
- Siemens Genuine — Authentic Siemens AVR for 1FC6 generators
- ±0.5% Regulation — Tight voltage control for stable power output
- Compounding System — Works with generator’s built-in compounding excitation
- Multi-Brand Compatible — Also fits Hyundai, Uljanik, Fenxi licensed units
Specification Comparison
Compatible Generators Siemens 1FC5/1FC6 series. **Cross-series substitution is strictly prohibited! Interfaces are not compatible!**
| Model | Generator Series | Application | Price |
| 6GA2-490-0A | 1FC5 series | Land-based power generation | $150-300 |
| 6GA2-491-1A | 1FC6 series | Marine power generation | $200-350 |
| 6GA2-492-1A | 1FC6 series | Land-based power generation | $150-300 |
Selection Advice These three models are mutually incompatible. Check the generator nameplate to confirm whether it is 1FC5 or 1FC6 before purchasing. Siemens AVRs are not interchangeable with any other brand.
