... AVR 1)CE and ISO Certification 2)AVR: SX460,SX440,AS440,MX321,MX341, R448,R449,R230,YH-8A,YH-12A,etc. Power AVR SX440 is ... a half-wave phase-controlled thyristor type Automatic Voltage Regulator(AVR) and forms part of the excitation ... % (see note 1)Thermal drift0.04% per deg. C change in AVR ambient (note 2) Typical system responseAVR response20 msFiled current to ...