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SurgeArrest components such as metal oxide varistors (MOV) and thermal fuses ensure instantaneous reaction to lightning strikes and wiring faults. If the surge components are damaged due to a power spike or an over voltage condition, 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.
IEEE tests simulate a surge of 6000 volts, such as in a direct lightning hit. The let-through rating indicates the maximum voltage that will reach your equipment when suppressed by a Surge Protector. A lower let-through rating indicates better protection. UL's best available rating against devastating surges and spikes is 330V of let-through. APC's Professional SurgeArrest has 85V let through voltage, thus exceeding UL's requirement. SurgeArrest attenuates EMI/RFI line noise that can cause data errors and keyboard lockups, ensuring better performance of protected equipment.