NH knife-blade fuse-links in sizes 000 to 4a, intended for protecting feeder circuits supplying turnout drives, turnout heating and station equipment. Current ratings up to 1600 A at 690 V AC and 120 kA short-circuit capability cover main outgoing feeders in railway signalling switchboards without requiring higher-level protective devices.
A dual blown-fuse indicator - mechanical and thermal - allows identification of an operated fuse both de-energized and under load. Grounded metal gripping lugs are designed for handling with a standard fuse puller, eliminating the risk of touching live parts during replacement.
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