... 2.Failure tripping 3.Local&remote alarm 4.Rail mount Power Supply SPD,Power SPDApplicationFor TN-S, TN-C, TN-C-S, TT ... and IT power systems of AC50Hz/60Hz, 380V and below, to protect the ... and vibration14. High mechanical resistance15. Standard 35mm rail mounting Max continuous operating voltage: 275V, 320V, 385V, 420V, 485V, 550V ...