Audible failure alarm Calls attention to a damaged surge supressor, identifying the need for service. Reduces the time protected equipment is at risk due to compromised surge suppression. Themal overload protection Prevents thermal run-away when metal oxide varistors (MOVs) become damaged, or when a continuous overvoltage condition exists. Manual disconnect switch Enables the surge supressor to be de-energized for service without disconnecting the protected load. Surge counter Records the number of power surges the unit is exposed to which can be used as an indicator that the unit is providing protection as intended. A high number of surges can be an indicator of poor facility power quality and the need for additional corrective actions NEMA 3R/12 enclosure Meets the requirements of a NEMA 3R enclosure for outdoor applications, and a NEMA 12 enclosure for indoor applications. Alarm contacts Enables remote monitoring of TVSS alarm status. Replaceable individual phase modules Significantly reduces the time to repair a damaged surge protector, minimizing the time that critical loads are unprotected from transients. 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. Noise Filtering Surge Protector attenuates EMI/RFI line noise that can cause data errors and keyboard lockups, ensuring better performance of protected equipment. Lightning and Surge Protection To prevent damage to your equipment from power surges and spikes.