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 (2P), 277Vac/480Vac voltage system (UL) rated voltage, MCOV (L-N) 440V 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 (35mm width), equivalent to 1002773