... ,AS440,MX321,MX341, R448,R449,R230,YH-8A,YH-1 Generator AVR SX440 is a half-wave phase-controlled thyristor type ... 97%300msExternal voltage adjustment+/- 10% with 1 k ohm 1 watt trimmer(see note 3)Under frequency protectionSet point95% Hz(see ... to 30 HzUnit power dissipation12 watts maximumBuild up voltage4 volts Generator AVR