1,CE,TUV,UL Certification & Test Report 2,spd,Surge Protector,surge arrester 3,quick response; MODELVC20/385/3PVC20/275/3POrder No. Protection LevelC or D LEVELMax. Continuous AC voltage Uc385V275VMax. Continuous DC voltage Uc500V350VNominal discharge current In (L-N L-PE)20KA(8/20μs)Max. discharge current Imax (N-PE)40KA(8/20μs)Limit voltage Up1.8KV