Automatic Voltage Regulator Low Frequency Protection Brushless Diesel Generator Parts Feature: 1. Suitable for diesel generator set, the installation of such voltage regulator is simple.2. While AVR-20 automatic voltage excitation regulator is qualified for high performance under strict rule.3. The voltage regulator can be used when there is no output voltage after starting, low voltage, overvoltage, unstable voltage, large voltage, normal voltage without load and voltage drop after loading.4. Low frequency protection and four wires, the quality of the generator controller is guaranteed, you can use it with confidence.5. Made of high quality materials, the voltage regulator can be easy to use in practical life. Specification: Item Type: Voltage Regulator AVR-20: Four Wires Mounting Hole Distance: Approx. 115mm/4.5in Mounting Hole Diameter: M Approx. 6mm/0.2in Output Current: 0-20A Output Voltage: 0-115V Low Protection Frequency: z Voltage Regulation Range: 195V- 265V Frequency: 50/60Hz Package List: 1 x Voltage Regulator 1 x User Manual