Signal indicator for NH fuse links of sizes 000/00/1 and 2 for mounting on the handle tabs of the fuse link NH fuse system 3NA, 3ND for selective line and system protection. The NH fuse system from Siemens as an important component of the SENTRON protection components for electrical installations offers effective protection of people, equipment and systems by safely switching off in the event of overload and short circuit. In comparison to circuit breakers, higher short-circuit currents can be achieved with better current limitation. The NH fuse system is characterized above all by: 1. Combination indicators signal the shutdown of the fuse by a clear color change from red to white. 2. Greater safety when changing thanks to insulated handle tabs. 3. High selectivity at low cost. 4. Long-term and safe operation thanks to silver-plated contact blades. 5. Fuse links available from 2 A to 1250 A and in sizes 000, 00, 0, 1, 2, 3, 4 and 4a.