... 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 ... 90V dc at 207V ac inputCurrentContinuous 4 A dcIntermittent 6A for 10 secsresistance15 ohms minimumregulation+/- 1.0% (see note 1 ...