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: 120/240V, Single 0 3-Wire and Ground. Surge Protection: 80kA. 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.