... ISO Certification 2)AVR: SX460,SX440,AS440,MX321,MX341, R448,R449,R230,YH-8A,YH-12A,etc. AVR for generator SX440 is ... a half-wave phase-controlled thyristor type Automatic Voltage Regulator(AVR) and forms ... part of the excitation system for a brushless alternator.Technical specificationinputvoltage190- ...