NH fuse-bases are available for delivery in single-pole and three-pole designs and can be closely mounted in parallel rows. Each three-pole base is upplied with two phase-partition walls. NH-ISO plugon covers which clip onto the contact springs can also be supplied for these bases. Ceramic fuse-bases in sizes 00 to 3 are provided with a single-part steatite base, while size 4 has a metal baseplate with 2 ceramic bases. Plastic fuse-bases have a single-part plastic base. The stable silver-plated contact springs are made of electrolytic copper and formed from one piece. Separate springing is provided by highly resilient captive steel springs, making the contact invulnerable to high thermal stress. Size 4 NH fuse-bases are designed for size 4 fuse-links with 8 mm contact blades. Size 4a fuse-bases are designed for size 4a fuse-links with 6 mm contact blades 0 mount 0 connector single NH00 and NH0 cable terminal .
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