ASCO™ Surge Protection Device, Series: 420, 120/240 VAC Electrical Rating, 47 to 63 Hz Frequency, 50 kA Short Circuit, Modes of Protection: L-N, N-G, L-L, Single LED Indicator, 1 ph, NEMA 4X Enclosure, DIN Rail Mounting, 3.25 in H x 3.25 in W x 4.12 in D Dimensions