Bussmann Whole House Surge Protector Bussmann whole house surge protector. Provides electrical system overvoltage protection for light commercial, residential, and UL Underwriter's Laboratories 508A applications. Protects against static discharge, lightning, or inductive load switching as well as additional protection for appliances, high-end electronics, security systems, and motor controls. Thermal disconnect technology eliminates the need for additional fusing. Install at the main service panel of new or existing homes. Can also be installed anywhere in the electrical system, loadside or lineside of the service entrance protective device to meet NEC installation location requirements. If installed outdoors, provide a degree of protection against rain, snow, windblown dust, splashing water, ice, and corrosion. LED light emitting diode light provides SPD status at a glance. Certified electrician required to install. 2 year warranty. Voltage 120V/240V, Mount Type Panel, Maximum Continuous Operating Voltage 150/300Vpk, Voltage Protection Rating 50V, Nominal Discharge Current 20kA, Short Circuit Rating 50kA, Dimensions 4-1/2 In. W x 4-1/2 In. H x 4-9/10 In. L, SPD Type Type 1, UL Listed Yes, CSA Listed Yes, Pkg Qty 1, Package Type Box