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AVR - Automatic Voltage Regulator M40FA640A

AVR - Automatic Voltage Regulator M40FA640A

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El Marelli Motori M40FA610A (REF. 10001467) 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.

$ 209.71 209.71 USD Tax Excluded

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AVR - M40FA640A is the automatic voltage regulator of the generator: it reads the output voltage and corrects the field excitation so the voltage stays stable as the load changes.

A failing AVR shows up before it dies: voltage dips 5–30 V when a large motor starts, lights flicker, or the control panel reboots. When it fails completely the set delivers only residual voltage or trips on overvoltage.

Specifications and compatibility

Applicable to
MARELLI MOTORI
Dimensions
22 x 6,5 x 13 cm
Weight
2.00 kg

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.

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
Applicable To MARELLI MOTORI
Weight 2,00 kg
Dimensions 22 x 6,5 x 13 cm
Spare Parts
Generator Parts AVR