(Package of 3 Pieces) Noark Surge Protection / Protective Device (SPD), UL 1449, for type 4CA applications, U4 series, L-N / N-PE 20kA (8/20µs) UL nominal discharge current, 2-poles (2P), 277Vac/480Vac voltage system (UL) rated voltage, MCOV (L-N) 440V maximum continuous operating voltage (Uc MCOV), DIN rail mounting (35mm width), equivalent to 1002738