M40FA610A ‘MGC I’ – Marelli AVR


M40FA610A MGC I analog for Marelli Motori generators of the MJB 500 and 560 series.

Price is included Thai Import Tax and VAT.

Price to customers outside of Thailand is 663 € + courier service 100 €. Taxes and duty fees at destination at buyer cost.

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The voltage regulator type “MGC I”, is suitable for Synchronous Generators of MARELLI MOTORI make, M8B and MJB series, size range 160-500 frames. This regulator is proper to operate on machines rated from 10 up to 2000 kVA. The regulator is fully insulated in order to maintain high reliability also with severe ambient conditions (high level of humidity, dust, salt atmosphere), and in case of high vibrations level. The regulator is proper both for single and 3-phase operation.

The M40FA610A is a analog automatic voltage regulator made by Marelli in Italy. The AVR’s main purpose is the sense and regulate the generator voltage and keep it at a constant reading by +/-1%

Technical Data
– Regulation Accuracy: +/- 1% steady state conditions
– Voltage Drift: +/- 0.5% voltage chage, for 50 ° C amb. temperature change
– Respond Time: 1 cycle (20ms – 16.6ms)
– Operating Temperature: -20 ° C ÷ +60 ° C
– Exciter Field Resistance: 3 Ω (min) ÷ 25 Ω (max)
– Supply Voltage: 170 -270 V
– Power Supply: 1000 VA (max)
– Power Dissipated: 30 W (max)
– Voltage Sensing: 170 -270 / 380 – 415 / 440 – 480 V
– Output voltage (DC): 30 V
– Output Current (DC): 8 A (max, continuous)
– Output current (DC): 15 A (max one minute forcing)

– Delivery Schedule: 4 working days ex-warehouse upon confirmation of payment received. (Transit time not inclusive.) In the event of some unforeseen reason out of stock, please allow 2 to 3 weeks lead time.
– Receipt: Once the parcel pick up, we will notify you via email. Airway bill no. will be advise as well.
– Product Origin: Italy
– Shipping: All parts ship door to door via courier service. All taxes and duty fees at destination at buyer cost.
– Should you not able to add more quantity, which means the value exceed the libility cost. Please send us an email (info@thai-avr.com) to request for official quotation. We will respond to your enquiry asap.

Generator frame size Standard
AVR supply Auxiliary winding*,
Voltage sensing Single phase
Voltage remote control Arrangement
Radio interference supressor Internal
MGC I 10001467
Over-exitation device Arrangement for varicomp
Parallel operation with the mains Arrangement for device
Parallel operation with similar generators Arrangement
Limiters Under-frequency
Function Auxiliary inputs
Power supply voltage 170 ÷ 277 Vac @ 50/60 Hz
Power supply source Auxiliary windings, mains
Voltage build-up 5 Vac
Voltage sensing type 1-phase
Voltage sensing range 170 ÷ 480 Vac
Current sensing type 1-phase
Current sensing range 1:00 AM
Maximum continuative field current 0 ÷ 8 Adc
Maximum forcing field current 0 ÷ 15 Adc
Maximum field voltage 100 Vdc
Field resistance 3 Ω ÷ 20 Ω
Regulation accuracy from no load to full load ±1 %
Steady state accuracy ±0.1 %
Accuracy with ±4% engine governing ±1 %
Thermal Drift ±0.5 %
Response time 1 cycle
Operating temperature -30°C ÷ +60°C
Storage temperature -40°C ÷ +70°C
L 176 mm
B 105 mm
K 160mm
H 41 mm
D 6.5mm
Weight 460g



The M40FA610A is a analog automatic voltage regulator made by Marelli in Italy. Standard on 500-560 frames. This regulator senses 2 phases and adjusts excitation when needed. Auxiliary windings is needed to power the AVR.


  • Mainly used on Olympian, FG Wilson & Caterpillar CAT generator sets


  • Marelli 10001467
  • Marelli MGC I
  • Marelli M40FA610A





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