EATON Cutler-Hammer Series Surge Protective Device, Series: CVX050, 220/380/230/400/240/415/277/480 VAC Electrical Rating, 50/60 Hz Frequency, 4W+G Wires, 100 kA Short Circuit, 100 kJ/Ohm Energy, 50 kA Peak Surge Current, 20 kA Nominal Discharge, Modes of Protection: 640 L-L/320 L-N/640 L-G/320 N-G, 3 ph, Environmental Conditions: -13 to 140 deg C Operating Temperature, NEMA 4X/IP56 Enclosure, Flush Mounting, 3.55 in L x 4.75 in W x 5.67 in H Dimensions