SENTRON, fuse switch disconnector 3NP1, 1-pole, NH3, 630 A, for assembly and installation on mounting plate, Flat terminal, cover level 70mm Fuse switch disconnector SENTRON 3NP1 3NP fuse switch disconnector up to 630 A with enhanced protection for personnel and plants and user-friendly connection system.. Optimized technology for your safety - only from Siemens.