SurgeArrest Panelmount, 480/277V, 120kA/ph, with Surge Counter, Replaceable 3-Phase Brick Module NEMA 3R/12 enclosure Meets the requirements of a NEMA 3R enclosure for outdoor applications, and a NEMA 12 enclosure for indoor applications. Noise Filtering 120kA SurgeArrest models contain EMI/RFI filtering to reduce line noise that can cause data loss and keyboard errors. 40kA and 80kA units do not contain noise filtering components, so they can be used with powerline networking systems (X10, HomePlug, PLC, etc.). Maximum surge current ratings 40kA, 80kA and 120kA per phase maximum surge current ratings, for all your residential, commercial and individual equipment protection needs. Catastrophic Event Protection SurgeArrest Panelmount SPDs are equipped with fuses and thermal disconnects that react quickly to protect against dangerous high and low current wiring faults as well as other catastrophic surge events. These panelmount SPDs are passive, and continue to allow power through to your home or building if any of the surge components are damaged. Status Indicator LED's LED status indicators for each phase and an audible alarm provide immediate failure notification when suppression circuitry has been damaged by a heavy strike or surge. Physical Size For easy installation inside your circuit breaker panel (40kA model) or next to your power distribution panels. (80kA and 120 kA models) Chase nipple connection Allows for mounting of the PM2X units rigidly to the side of your panelboard.