Transient voltage surge suppressor (TVSS) units protect sensitive electronic equipment from transients. TVSS is a modular parallel device designed for service entrance, distribution or branch panel applications. This kit is a digital display unit and counter. It is for three phase panels, switchboards, and switchgear. The unit has a vertical orientation with the RJ45 patch cable connection at the side of the unit. This display unit is a replacement for TVSS Surgelogic.