Circuit-breaker vl 1200 ul; type ng (cat no. nnx3u120) non-interchangeable frame w. approbation circuit-breaker to ul489 standard switching capacity 3-pole, nema rating 35ka/480v, (molded case circuit breaker) overcurrent release etu, lsig tu= 40 degr. celsius 3 phases/4 cables in= 1200a, rated current isd=1. 5 to 10 x ir, ii=10 x in short-circuit protection ir= 400-1200a overcurrent rel. f. plant protection w/o connection accessories