Made of high-quality materials, sturdy and AVR 6GA2-491-1A Easy to use 6GA2-491-1A generator is a half-wave phase controlled thyristor type Automatic Voltage Regulator and forms part of the excitation system for a brushless generator AVR 6GA2 491-1A Automatic Voltage Regulator For 1FC6 Series Generator Alternator Genset Volt Regulation 6GA2-491-1A 6GA24911A Name:Automatic Voltage Regulator Board Model:6GA2-491-1A Function:Regulate Generator Voltage Applicable:For 1FC6 Series Generator Alternator Genset Volt Regulation (Batch different, product printing characters, parts be different, does not affect the use) Colour:Green Material:PCB Package Contents: 1x Automatic Voltage Regulator Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.