... ,MX321,MX341, R448,R449,R230,YH-8A,YH-12A,etc. Generator AVR 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 specificationinputvoltage190-264V acfrequency50-60 Hz ... per deg. C change in AVR ambient (note 2) Typical system responseAVR response20 msFiled current to 90%80 msMachine volts to ...