AVR - Automatic Voltage Regulator M40FA610A
El Marelli Motori M40FA610A es un regulador de tensión tipo “W1” para generadores síncronos Marelli Motori series M8B y MJB (160-500) de 10 a 2000 kVA. Totalmente aislado para alta fiabilidad en condiciones ambientales severas (humedad, polvo, sal, vibraciones), es apto para operación monofásica y trifásica. Ofrece una fuente y detección de voltaje de 170-277 V (50/60 Hz), con una corriente de campo continua de 8 A (15 A forzada por 1 minuto) y 100 V de voltaje de campo máximo. Destaca por su precisión de regulación de ±1%, deriva térmica de ±0.5% y un tiempo de respuesta de 1 ciclo, operando entre -20°C y +60°C.
AVR - M40FA610A belongs to the generator excitation circuit and holds the output voltage within about ±1 % when the load steps up or down.
AVR wear is thermal. It works inside the generator compartment with no ventilation of its own, so it is usually the first module to age on a high-hour set. Keeping one on the shelf avoids a multi-day stop for a low-cost part.
Specifications and compatibility
- Brand
- OEM
- Model
- M40FA610A
- Applicable to
- MARELLI MOTORI
- Dimensions
- 22 x 6,5 x 13 cm
- Weight
- 2.00 kg
- Country of origin
- China
How to verify before ordering
- Check that the reference printed on the AVR label (for example AS440, MX341, R120) matches exactly; variants differ in sensing range and excitation level.
- Confirm the excitation input voltage and the generator type it serves. They are not interchangeable across generator makes or speed ranges.
- Inspect wiring and brushes before replacing the module: a loose connection produces exactly the same symptoms as a burnt AVR.
- The reference shown on this listing is M40FA610A; cross-check it against the one stamped on the removed part.
- Declared origin: China. Check this if your purchase requires a specific origin.
Frequently asked questions
How do I know the fault is the AVR and not the generator?
Measure output voltage at steady load. If it is low and does not respond to the excitation trim, while windings and rotating diodes are healthy, the AVR is the suspect. A cross-test with a spare AVR confirms it in minutes.
Can the voltage be trimmed after installation?
Yes. Most of these regulators have a voltage and a stability trim pot. Set them at no load to the site nominal voltage, then verify under load before signing off.
Related parts
See the spare parts catalogue or request a quotation quoting the equipment reference. Third-party trademarks are cited for identification purposes only.
Specifications
| Characteristics | |
|---|---|
| Brand | OEM |
| Country of Origin | China |
| Model | M40FA610A |
| Applicable To | MARELLI MOTORI |
| Weight | 2,00 kg |
| Dimensions | 22 x 6,5 x 13 cm |
| Spare Parts | |
|---|---|
| Generator Parts | AVR |
