Noark Surge Protection / Protective Device (SPD) with remote signal contact, 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) - 1NO+1NC (1 Normally Open + 1 Normally Closed) signal contact (max. 1.5A at 250Vac / 3A at 125Vac), DIN rail mounting (52.5mm width), equivalent to 1002779