(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 , 1-pole (1P), 400Vac/690Vac voltage system (UL) rated voltage , MCOV (L-N) 660V maximum continuous operating voltage (Uc MCOV), DIN rail mounting (17.5mm width), equivalent to 1002730