M63FA310A ‘MGC II’ – Marelli AVR


M63FA310A MGC II analog for Marelli Motori generators series 630 to 800.

Price is included Thai Import Tax and VAT.

Price to customers outside of Thailand is 1270 € + courier service 100 €. Taxes and duty fees at destination at buyer cost.

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The M63FA310A is a analog automatic voltage regulator made by Marelli in Italy. Standard on 630-800 frames. This regulator senses 2 phases and adjusts excitation when needed. Auxiliary windings is needed to power the AVR.

Technical Data
– Regulation Accuracy: +/- 1% steady state conditions
– Voltage Drift: +/- 0.5% voltage change, for 50 ° C amb. temperature change
– Respond Time: 1 cycle
– Operating Temperature: -20 ° C to +60 ° C
– Exciter Field Resistance: 3 Ω (min) ÷ 25 Ω (max)
– Supply Voltage: 170 -270 V
– Power Supply: 1000VA (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)


Generator frame size Standard
AVR supply Auxiliary winding*,
Voltage sensing Single phase
Voltage remote control Arrangement
Radio interference supressor Internal
MGC II 10004378
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
Interface Potentiometers, dip-switches
Function Droop compensation
Protection Under-frequency limiter
Internal fuse, replaceable
Control External potentiometer, 1 kΩ – 2 W
External DC voltage signal (-3/+3 V)
L 176 mm
B 105 mm
K 160mm
H 70 mm
D 6.5mm
Weight 410g



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


  • Marelli 10004378
  • Marelli MGC II
  • Marelli M63FA310A




– 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.


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