Fuses

Choose a fuse by its full designation and matching holder or device. In this category, distinguish cylindrical and blade versions, shape, markings and exact reference.

Establish the format before the other parameters

Cylindrical and blade fuses are shown with different dimensional designations, including NH formats. Start with the existing holder type or exact intended system. Similar-looking fuse links should not be treated as substitutes solely by approximate size. Record full markings and code when comparing specific products.

For a cylindrical version, compare the fuse link dimensions with the corresponding holder's data. For blade versions, retain the full NH designation. This information is separate from the current rating. If you have only a photograph without legible markings, it is a starting point for identification, rather than sufficient grounds for selecting a replacement.

Marking is more than a single number

Category designations include gG and aM. These must remain part of the comparison by specific reference instead of being omitted when seeking an identical current rating. Check the protective purpose and suitability for the specific application in the selected fuse link's documentation. Do not treat different letter designations as interchangeable solely because the physical format looks the same.

Clarify the current, voltage and other requirements separately in the design or equipment documentation. A higher value in one item is not an independent criterion for a suitable replacement. Compare products for the same task and system without transferring parameters between sizes or series from one manufacturer.

The fuse link and remaining equipment are separate items

If you need a device with a designated fuse position, explore load-break switches and disconnectors. A fuse link in the list does not mean a holder or complete configuration is included. Check which components form part of the specific solution and which are ordered separately.

For the other type of product, use circuit breakers, and for a general distinction, circuit breakers and fuses. When replacing a fuse link, have its full designation and the holder's details to hand. The choice of a specific replacement should be checked for the equipment; here, the format and markings serve to narrow the search, without instructions for work on the installation.