American Power Conversion Corporation by Schneider Electric (APC by Schneider Electric) is the leading international manufacturer of state-of-the-art interruptible power supplies, redundant switches, power management software, and related equipment. APC by Schneider Electric products protect hardware, software, and data from the threat of power disturbances in business and government offices throughout the world.

In 2007, Schneider Electric acquired APC Schneider Electric and combined it with MGE UPS Systems to form Schneider Electric's Critical Power & Cooling Services Business Unit, which recorded 2007 revenue of $3.5 billion (EUR 2.4 billion) and employed 12,000 people worldwide. 

Silicon21 has started its distribution partnership with APC in 2004.