Voltage Stabilizer 1)CE and ISO Certification 2)AVR: SX460,SX440,AS440,MX321,MX341, R448,R449,R230,YH-8A,YH-12A,etc. Voltage Stabilizer SX440 is a half-wave ... phase-controlled thyristor type Automatic Voltage Regulator(AVR) and forms part of the ...