For surge protection at the sub panel or near sensitive equipment. Designed for residential and light commercial/industrial applications. Dimensions: 6 5/16 x 4 3/4 x 3 9/16 (160mm x 120mm x 90mm). Ten-year, unconditional product warranty. Electrical Service: 120/240/120V, Hi-Leg Delta. Surge Protection: 160kA. NOTE: Add suffix -A to part number for NO/NC dry contact relay for connecting remote monitoring device. Add suffix -B to part number for EMI/RFI noise filter. Add -AB to part number for both options.