American Power Conversion (APC) today announced a voluntary recall of two models in its Back-UPS CS uninterruptible power supply (UPS) line due to “potential safety issues that may result in overheating and represent a potential fire hazard.” The total number of affected devices being recalled worldwide is approximately 2.1 million with approximately 900,000 devices recalled in the U.S. The recall is limited to the Back-UPS CS 350 and the Back-UPS CS 500, in both 120-volt and 230-volt models. The affected units were manufactured between November 2000 and December 2002. Further information is available here.