1、For Brushless Generators: This automatic voltage regulator is used for brushless generators, precisely and stably regulates and stabilizes voltage. 2、Under Frequency Indication: With under frequency roll off protection, and under frequency LED indicator, easy for you to observe and operate. 3、Safety Control: This AVR module also includes speed and loss of power protection, ensures safe and reliable control of the generator. 4、Excellent Semiconductor: This automatic voltage regulator uses mature semiconductor, makes ensure a positive voltage build up from the residual level. 5、Professional Module: The AVR is professionally manufactured with seamless design, can be perfectly matched with the generator, has good wear resistance, easy to install. Item Type: Automatic Voltage Regulator Board MAaterial: PC, copper Model: 6GA2 491-1A Burden: 500VA Phase: Three phase and single phase Across: 220 380 440Vac, 1 phase, 2 wires Frequency: 50/60Hz jumper selector Features: 4. 120 or 240 Vac sensing, jumper selectable 5. Underfrequency roll off protection 6. With underfrequency LED indicator 1 x Automatic Voltage Regulator Board