Safety : Building Wiring Fault Indicator: - This LED informs users of potentially dangerous wiring problems in the wall circuit. Protection working indicator: - 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. Catastrophic Event Protection: - SurgeArrest components such as MOVs and Thermal fuse ensure instantaneous reaction to lightning strikes and wiring faults. If the surge components are damaged due to power spike or over voltage, excess power cannot reach your equipment. Unlike the APC SurgeArrest products, most surge suppressors continue to let power through even after circuits have been damaged, leaving your equipment exposed to other damaging surges. Fail Safe Mode: - Most other surge suppressors continue to let power through even after their circuits have been damaged, leaving your equipment exposed to future surges. APC´s SurgeArrest fail safe, which means that once the circuit of an APC SurgeArrest has been compromised the unit disconnects equipment from the power supply ensuring that no damaging surges reach your equipment. Protection: Lightning and Surge Protection: - To prevent damage to your equipment from electric power surges and spikes. Noise Filtering: - Attenuates EMI/RFI line noise that can cause data errors and keyboard lockups, ensuring better performance of protected equipment. Safety-Agency Approved Surge Protector: - All the APC surge protectors undergo stringent testing to comply with global and local agency safety requirements.