The APC Surge Protector delivers surge protection for computers and other electronics devices.APC surge protectors undergo stringent testing by IEEE, and are awarded "let-through ratings", which indicate the maximum voltage level that can possibly reach your equipment after a surge or voltage spike has passed through an electric surge protector. Lower IEEE let-through ratings indicate better protection and performance. The APC Essential SurgeArrest series offers optimal performance with a let-through rating of less than 330V for North American products, and a rating of less than 15% for products sold worldwide. All APC products comply with local agency safety requirements, including UL in North America and TelepermitIt has a manual switch that enables the surge suppressor to be de-energized for service without disconnecting the protected load. Plug angle allows for equipment and furniture to be placed closer to the wall than with a standard power cord.