APC's Commercial/Industrial Surge Suppressor provide protection for your commercial facility, industrial building and data center from damaging power surges and spikes. This TVSS (transient voltage surge suppressor) unit can be installed at your service entrance and electrical panels throughout your facility. This surge suppressor protect against severe voltage spikes caused by lighting and utility accidents, as well as smaller, far more frequent surges caused by normal everyday operation of motors, pumps and other large equipment inside your facility. This surge suppressor come in modular (replaceable surge suppression modules) and nonmodular designs, and feature the latest industry approvals and safety ratings.