NH fuse insert, NH3, In: 355 A, gG, Un AC: 500 V, Un DC: 440 V, front indicator, live grip handles. The NH fuse insert SENTRON 3NA3 provides selective protection for circuits and systems. The NH fuse system ensures effective protection for people, devices, and systems by safely disconnecting in the event of overload and short circuit. The NH fuse inserts are available from 2 A to 1250 A and in sizes 000, 00, 0, 1, 2, 3, 4, and 4a. Variants with communication and measurement functions are available in size 2 from 80 A to 315 A. SENTRON protective circuit breakers - a safe choice. Now even smarter.