nVent ERICO Surge Protection Device, 3+0 Mode, Series: DT2, 277 VAC Electrical Rating, 200 kA Short Circuit, 20 kA Nominal Discharge, Modes of Protection: L-PEN, 25 ns Response, Mechanical Flag Indicator, Class: Class II, Environmental Conditions: -31 to 185 deg F, 5 to 95% Relative Humidity, IP20 Enclosure, DIN Rail Mounting, Thermoplastic, 3.54 in H x 2.13 in W x 2.72 in D Dimensions,