Basic Protection Against Power Surges for Computers and Electronics. SurgeArrest will warn you if its circuitry has been damaged by heavy strike or power line surge and it is unable to provide 100% protection. If still under warranty, APC will then replace your damaged SurgeArrest free of charge. Resettable circuit breaker Easy recovery from overloads; no need to replace a fuse. EMI and RFI noise filtering Reduces line noise that can cause data loss and keyboard errors. Data-line Protection Protection of data lines (Ethernet, Coaxial and Phone lines) ensures complete protection of your equipment from surges. It is very important to protect your equipment from “back door†electric surges traveling through data lines, as they can be as damaging to your equipment as surges traveling over power lines.