NH fuse link, NH3, In: 500 A, aM, Un AC: 690 V, front indicator, live grip lugs NH fuse link SENTRON 3ND for switchgear protection in motor circuits.3ND fuses offer effective protection in the event of a short circuit and are particularly suitable for use in motor circuits due to their slow-blow switch-off characteristics.The NH fuse links 3ND are available from 6 A to 630 A and in sizes 000, 00, 0, 1, 2 and 3.SENTRON protective switching devices - a safe choice. Now even smarter.