AVR 520-35A

Technical details

Input voltage

180-240V AC.I phase2wire

Output voltage

Max.75V DC @240V AC input

Output current Continuous

25 AMP

Output current for 10sec

35 AMP

Voltage Regulation

< ± 0.5% (with 4% Engine Governing)

Voltage Build-up

Residual volts at AVR terminal > 1 VAC

External Volts Adjustment

± 7% with 1 KΩ 1 Watt trimmer

Soft Start Ramp Time


Under Frequency Protection

60 Hz system presets knee point at 57 HZ, (Factory Settings) 50 Hz system presets knee point at 47 HZ

The power supply and the sensing terminals are common and are marked L1 – N and operates on a supply of about 220 vac
(50 or 60 Hz) obtained directly from the output of the generator.
Note: be sure the frequency of the generator is fixed at 50 or 60 HZ (the adjusting of the frequency depends on the engine speed)
The AVR is not responsible for the frequency.
In order to get optimum results during on load operation, speed variation must not exceed more than +/- 2% of the nominal value.


AVR 520-35A is 35 Ampere general type AVR half-wave phase-restricted thyristor Automatic Voltage Regulator (AVR) and forms part of the excitation structure for a brush-less generator. In accumulation to regulating the generator voltage Excitation power is derived directly from the generator terminals.