3 Modes of protection (L-N : L-G : N-G) - The remaining modes continue to provide protection in the event a mode of protection is compromised as a result of a surge. LED Building Wiring Fault Indicator - This LED informs users of potentially dangerous wiring problems in the wall circuit. Always on Outlets - 8 outlet models offer dedicated space to accommodate wide transformer blocks without covering adjoining outlets and 2 always on outlets. You can plug 8 power cords including 3 transformers at the same time. In case you have equipment that has to stay on all the time, such as fax machine, you can plug it in always on outlets. The equipment will be protected and will have power supply even when the unit is switched off. 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. Computer compatibility - The "Power-Saving Outlets" feature will work regardless of whether a desktop computer, laptop or netbook is used as the "Master" device. EMI and RFI noise filtering - Reduces line noise that can cause data loss and keyboard errors. 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. Lightning and Surge Protection - To prevent damage to your equipment from electric power surges and spikes. Power-saving outlets - Automatically cuts power to idle equipment to conserve electricity. 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. Adjustable Cable Management - Keeps cords and cables neat and organized. Receptacle Shock Safety Shutters - Shutters protect users from accidental contact with unused outlets. 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. Phone Line Splitter - Allows use of two pieces of equipment at once, such as a modem and phone. Transformer Block Spacing - Connect bulky transformer block plugs without covering up other outlets. 180 degree Rotating Cord Retainer - A 180-degree rotating cord with strain relief offers flexibility in positioning the SurgeArrest, and in routing the power cord. Overload Indicator - Indicator illuminates when connected equipment draws more power than unit’s capacity. To remedy the condition, unplug less vital equipment.