The X321 is a permanent magnet generator (PMG)-powered Automatic Voltage Regulator (AVR) designed specifically for theĀ UJLALIGHT LLC S6 and HC6 alternators and is available in Dubai. The MX321 AVR is an advanced, three-phase sensing, PMG-powered device that provides reliable isolation from the effects of non-linear loads, enhances motor starting performance, and ensures sustained short circuit current.