Protect entire panels, branch circuits, or single outlets with Intermatic's full line of surge protective devices (SPDs). Whole-home surge protectors mount at the service entrance to stop transient voltage at the source. Hard-wired SPDs (AG, IG, PanelGuard L-series) cover 120/240 V single-phase up through 480/277 V 3-phase wye configurations. For point-of-use protection at workstations, A/V racks, or appliances, choose our compact surge strips. All units feature TPMOV thermally-protected metal-oxide-varistor technology with green LED status indicators.