Product Details

M31FA600A – Automatic Voltage Regulator

Marelli digital AVR; MEC20

$1,838.00 SGD

M31FA600A – Automatic Voltage Regulator

The M31FA600A MEC-20 voltage regulator is suitable for synchronous generators constructed by MARELLI MOTORI from series MJB for sizes 315 to 800.

The M31FA600A voltage regulator is a micro-processor device with pulse-width modulation (PWM) output stage, and can be calibrated using potentiometers. The circuit board is resin-bonded in order to maintain a high degree of operational reliability even in difficult environmental conditions (high levels of humidity, dust, a salty atmosphere) and in the presence of vibrations.

Technical Data:

    • Type: 1=phase.
    • From:
      • Mains
      • Auxiliary winding
      • Permanent magnet generator (PMG)
    • Range: From 170Vac to 277Vac +/-10% @ 50/400Hz.
    • Self-excitation: 5Vac.
    • Voltage:
      • 1-phase, 2 terminals
      • 3-phase, 3 terminals
      • From 220Vac to 480Vac +/-10% @ 50/60Hz.
    • Current: From 0 to 1Aac (@ 50/60Hz)
    • Range 1: From -5 to +/-5Vdc for a variation from -15% to +/-15% of the voltage reference.
    • Range 2: Suitable for connection to Power Factor Regulator M50FA400A.
    • Resistance: From 3Ω to 20oΩ .
    • Continuity: From 0 to 7 Adc.
    • Forcing 10s: From 0 to 15 Adc.
    • Soft start: Ramp time adjustable from 0 to 60s.
    • Parallel between generators:
      • Type: Reactive droop compensation
      • Droop: from 0 to 15%
      • Type: Inverse time characteristic
      • 1 maximum settable threshold, above which the limiting device operate according to the characteristic
      • 1 open collector output per signal
    • Under frequency limiting device:
      • Corner frequency adjustable from 40 to 60 Hz
      • Zero Volt frequency adjustable from 0 to 40 Hz
    • From 0 to 100% load: +/-0.5% @ PF 0.8 – balance and non deforming load and constant frequency.
    • With +/-4% engine governing: +/-1% @ steady state conditions for load and speed.
    • Steady state: +/-0.1% @ at constant load and frequency.
    • Thermal drift: +/-0.5% for a change of 30°C at T AMB in 10 minutes.
    • V/Hz: +/-2%
    • Operating temperature: From -30°C to +70°C
    • Storage: From -40°C to +80°C

Use with Power Factor Regular model M50FA400A. For varicomp model M40FA630A and M40FA632A.

Share the spares
  1. All prices and amounts displayed on this website are in Singapore dollars.
  2. Delivery Schedule:
    • Standard 4 to 5 working days ex-warehouse upon confirmation of payment received. (Transit time not inclusive.) If out of stock for some unforeseen reason, please allow 2 to 3 weeks for delivery.
    • During the post COVID-19 pandemic period, some spare parts may require up to 2 working weeks lead time. When the situation improves, we will improve. If you urgently need spare parts for replacement or repair work, please email us to confirm the delivery schedule before placing an order and paying through the online store.
    • For indented parts or items from Italy, it is estimated that it will take 4 working weeks (maybe longer) to ship out after payment is confirmed. (Not including shipping time.)
  3. Receipt: Once the parcel pick up, we will notify you via email. Airway bill no. will also be informed..
  4. Product Origin: Italy
  5. Shipping: All parts are delivered to your door via courier service. All taxes and duties at destination are the responsibility of the buyer. Unless otherwise stated in our other forms.
  6. If you have problems with the online store, please email us ( for an official quote. We will reply to your inquiry as soon as possible.
  7. The above remarks are subject to change without notice, please be sure to check the remarks before confirming your order and making payment.
Origin - Italy

Most parts sold origin from Marelli's factory in Italy. Unless some accessories or diodes may not produce by factory.

Best Offers

We offers best price & process 4 to 7 working days upon received of full payment. Airway bill alert would be send to purchaser as soon as it is ready.

Secure Payments

Online payment through paypal secure site. You would be contacted once we received your payment alert.

Worldwide Shipping

We ship to almost any part of the world. Except few locations which blocked by the courier service company.

Shopping Basket