... 3.Best after-sale servie STAMFORD AVR SX460: AVR SX460 is a half-wave phase- ... controlled thyristor type Automatic Voltage Regulator(AVR) and forms part of the excitation system ... AVR as follows: Stamford series: SX440,AS440,MX341,AS480 Leroy somer series: R230,R438,R448,R449,R250 Universal AVR:GAVR-8A,GAVR-12A ... ,GAVR-15A AVR for brush generator:YS-100 ...