Siemens Surge SuppressorsHard-wired Type 1 SPDs, formally known as TVSS, are ideal surge protection solutions for commercial/industrial, OEM, and residential applications. Most models carry a 20kA I-nominal rating, which is required for UL 96A lighting protection certification. Features include indoor/outdoor enclosure ratings, thermally protected metal oxide varistor technology, and LED protection status indication. 100kA, 200kA, and 300kA models include EMI/RFI filtering and are UL 1283 Listed. UL 1449 3rd. EditionSurge Protector, Hardwired, Location Type Type 1, Nominal Discharge Current 20kA, Voltage 120/240, Phase 3, Wire 4, Number of Poles 3, Max. Surge Current Per Phase 300, Max. Surge Current Per Mode 150, Max. Continuing Operating Voltage 150/320, Voltage Protection Rating 600/1200V(L-N), 700/1200V(L-G), 500(N-G), 1000/1000V(L-L), Short Circuit Current Rating 200, Modes of Protection 7, Mounting Style External, Material of Construction Steel, Enclosure Type NEMA 1/12/3R/4