Item Type: R230 AVR Automatic Voltage Regulator Material: ABS Voltage Regulation: Approx. 0.5% Power Supply Range: 85-139 V Potentiometer for Voltage Setting: 1000/0.5W, Minimum Setting Range 5% Use: Voltage Regulator Gross Weight: Approx. 325g/11.5oz1Self Excited Function: The alternator with shunt excitation is self excited with an R230 automatic voltage regulator. 2Monitoring of Excitation Current: The regulator monitors the exciter excitation current as a function of the alternator output voltage. 3No Sustaining Short Circuit: Very simple design, alternators with parallel excitation have no sustaining short circuit capability. 4Perfect Replacement Parts: The automatic voltage regulator board is professionally designed for a perfect fit and finished for easy assembly. 5Durable Material: The R230 AVR automatic voltage regulator is made of high grade ABS material for stable and reliable use. 1 x R230 AVR Automatic Voltage Regulator 1 x Manual