What is an SX460 AVR? What does it look like? What are the SX460's specifications? What is an SX460 AVR? An SX460 AVR is an Automatic Voltage Regulator, made by Stamford. The Stamford company name has been Newage International, Stamford AVK and Cummins Generator Technologies. What does the SX460 AVR look like? The SX460 AVR looks like the image below. This is an original Stamford SX460 AVR. The current Stamford AVR looks like this. Make sure you don't buy a fake AVR. - You can buy a genuine SX460 here.