Square D™ Surge Protective Device, Isolated Ground, Series: HEPD, 120/240 VAC, 3 Wires, 25 kA Short Circuit Current, 10 kA Nominal Discharge, Modes of Protection: L-N/L-G/N-G, LED Status Light Indicator, 1 ph, Environmental Conditions: -31 to 149 deg F Operating, NEMA 4X, 3.72 in W x 2.1 in D x 3.23 in H