1、Brushless Alternator Use: This parallel excitation automatic voltage regulator is used for brushless alternators, very practical. 2、Wide Voltage Range: The AVR monitors exciter field current as a function of alternator output voltage, with input voltage of AC 85‑139V. 3、Flame Retardant Material: Made of flame retardant and heat resistant material, this AVR module is safe and reliable in use. 4、Precise Regulation: The voltage regulator automatically and precisely adjusts and stabilizes the voltage, provides good performance for alternators. 5、Good Stability: Manufactured by exquisite workmanship, professional and standard, the board has great stability. 1 x Automatic Voltage Regulator Board1 x Manual Item Type: Automatic Voltage Regulator BoardMaterial: ABSModel: R230Power Input: Voltage 85-139VAC, frequency 50/60HzMagnetic Field Output: Maximum 90VDC when input voltage 120VAC, maximum 8A continuous current output, 10A within 10 seconds non continuousVoltage Regulation Rate: ± 0.5%Working Environment Temperature: -25℃ to 70℃Usage: This is shunt type excitation automatic voltage regulator for brushless alternators