NH fuse link, NH4a, In: 500 A, gG, Un AC: 500 V, Un DC: 440 V, front indicator, live grip lugs NH fuse link SENTRON 3NA3 for selective line and system protection.The NH fuse system offers effective protection for people, equipment and systems by safely switching off in the event of an overload or short circuit.The NH fuse links are available from 2 A to 1250 A and in sizes 000, 00, 0, 1, 2, 3, 4 and 4a. The variants with communication and measuring function in size 2 from 80 A to 315 A.SENTRON protective switching devices - a safe choice. Now even smarter.