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. The 'Institute of Electrical and 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. Underwriter's Laboratory's UL1449 surge protection safety standard uses these ratings to help users gauge performance. UL's best Transient Voltage Surge Suppressor (TVSS) Let-Through Voltage rating is "300V".

• Lightning and Surge Protection
• IEEE let-through ratings and regulatory agency compliance
• Catastrophic event protection
• Fail safe mode
• Protection Working Indicator
• Building Wiring Fault Indicator