Protection from damaging power transients Protection Working Indicator Surge Arrest will warn you if its circuitry has been damaged by heavy strike or power line surge & it is unable to provide 100% protection. If still under warranty, APC will then replace your damaged Surge Arrest free of charge. Overload Indicator Indicator illuminates when connected equipment draws more power than unit’s capacity. To remedy the condition, unplug less vital equipment. Right Angle Plug Plug angle allows for equipment & furniture to be placed closer to the wall than with a standard power cord. Reduces cord stress too.IEEE let-through ratings & regulatory agency compliance Stringent third-party testing gives you confidence that APCs surge protectors will safeguard your equipment & data from potentially damaging surges & spikes.AV Surge Protectors Features & Benefits Safety Building Wiring Fault Indicator Immediately warns you of wiring problems like improper grounds that could cause shocks or prevent adequately suppressing surges. Catastrophic Event Protection Surge Arrest components such as MOVs & Thermal fuse ensure instantaneous reaction to lightning strikes & wiring faults. If the surge components are damaged due to power spike or over voltage, excess power cannot reach your equipment. Unlike the APC Surge Arrest 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 Surge Arrest fail safe, which means that once the circuit of an APC Surge Arrest has been compromised the unit disconnects equipment from the power supply ensuring that no damaging surges reach your equipment.IEEE let-through rating & UL 1449 compliance The Institute of Electrical & Electronics Engineers (IEEE) Let-Through Voltage rating is based on a test that subjects a Surge Protector to a 6, 000 volt spike. The rating equates to the amount of excess voltage that reaches connected equipment. The lower the number, the better the performance of the Surge Protector is. Underwriters Laboratorys UL1449 surge protection safety standard uses these ratings to help users gauge performance. ULs best Transient Voltage Surge Suppressor (TVSS) Let-Through Voltage rating is "300V". Protection Noise Filtering Attenuates EMI/RFI line noise that can cause data errors & keyboard lockups, ensuring better performance of protected equipment.