Auxiliary switch, 1 changeover contact, electronically compatible, for size NH00, accessory for fuse switch disconnector 3NP1 Fuse switch disconnector 3NP up to 630 A with improved personal and system protection and convenient connection technology. The fuse switch disconnectors protect systems in industry or infrastructure from overload and short circuits and are suitable for cross-industry use. The standard reach-around and touch protection of the new Sentron series 3NP prevents the user from touching live parts when assembling busbar systems, even when accessing from the rear. In addition, the user can easily see the fuses used through the large viewing window. The Siemens fuse switch disconnectors 3NP are characterized above all by: 1. Extremely flexible thanks to modular design and consistent accessories. 2. Suitable for floor mounting, top hat rail, and Siemens busbar system 8US 3. Electronic fuse monitoring function including network monitoring. 4. Five sizes from 100 A to 630 A up to protection class IP40. 5. Fast and safe conversion for cable outlet at the top / bottom. 6. Flexible switching times of the auxiliary switch possible (simultaneous or leading). 7. Possibility of locking and sealing.