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 + neutral (2P+N), 347Vac/600Vac voltage system (UL) rated voltage, MCOV (L-N) 550V maximum continuous operating voltage (Uc MCOV), DIN rail mounting (52.5mm width), equivalent to 1002744