Disaster protection SurgeArrest components such as MOVs and overtemperature fuses ensure that there is an immediate response to lightning strikes and cabling faults. If the protection components are damaged due to power peaks or overvoltage, excess power will no longer reach the connected devices. Unlike APC SurgeArrest products, most surge protectors will continue to flow power even after the circuits have been damaged and the devices are subsequently exposed to further surges. Protection indicator SurgeArrest warns you if its circuit has been damaged by a severe impact or a voltage surge in the power line and can no longer provide 100% protection. If protection still exists, APC will replace your damaged SurgeArrest free of charge. Wiring problem indicator This LED signals potentially dangerous wiring problems in the flush-mounted cables.