APC’s Residential Surge Suppressors are the first line of defense against damaging electrical surges and spikes that originate outside your home. They are installed by an electrician at your circuit breaker panel and safely reduce the severity of power transients caused by utility accidents, power outages and lightning. Always use APC line cord surge suppressors in conjunction with Whole House Surge Suppressors for maximum protection of your computers, audio/video components and other electronic devices.