Features 1、Self Excited Function: The alternator with shunt excitation is self excited with an R230 automatic voltage regulator. 2、Monitoring of Excitation Current: The regulator monitors the exciter excitation current as a function of the alternator output voltage. 3、No Sustaining Short Circuit: Very simple design, alternators with parallel excitation have no sustaining short circuit capability. 4、Great Replacement Parts: The automatic voltage regulator board is professionally designed for a great fit and finished for easy assembly. 5、Premium Material: The R230 AVR automatic voltage regulator is made of high grade ABS material for stable and dependable use. Specifications Item Type: R230 AVR Automatic Voltage Regulator Material: ABS Voltage Regulation: Approx. ±0.5% Power Supply Range: 85-139 V Potentiometer for Voltage Setting: 1000Ω/0.5W, Minimum Setting Range ±5% Use: Voltage Regulator Gross Weight: Approx. 325g/11.5oz Package List 1 x R230 AVR Automatic Voltage Regulator 1 x ManualAVR R230 Automatic Voltage Regulator Stable Replacement Generator Parts 85‑139V SZRH A-C