Ditek Surge Protection Device, 1-Phase, Multi-Purpose, Series: DTK-CM+, 120/240 VAC, 20 A, 50/60 Hz, 3 Wires, 10 kA Short Circuit, 50000 A Peak Surge, 10 kA Nominal Discharge, Modes of Protection: L-G, L-L, Indicators: 2-LED, NEMA 4X, Rack Mount, 3/4 Inch NPT Parallel Wired Terminal, 3.5 Inch L x 1.89 Inch W x 3.4 Inch H