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A fuse is an overcurrent protective device containing a calibrated current-carrying member that melts and opens a circuit under specified overcurrent conditions.

The NEMA Fuse Section develops technical standards and serves as the industry voice for positively impacting product safety and performance requirements, and relevant government relations and trade activities.

Section Scope

The scope of the NEMA Fuse Section includes the following:

1. Non-renewable plug fuses.
2. Non-renewable cartridge fuses, not exceeding 1000 volts AC 1200 volts DC or less.
3. Renewable cartridge fuses and renewal links or elements, 600 volts or less.
4. Fuse holders and fuse blocks.
5. Excluded are all other types, such as miscellaneous and special purpose fuses.

For more information go to the NEMA Fuse Page

NEMA Standard for Low Voltage Cartridge Fuses

This standard covers eight classes of low voltage cartridge fuses consisting of a current-responsive element inside a fuse body with contacts on both ends, rated 600 V or less, ac and dc. The classes are G, H, J, K, L, R, T and CC. The document includes definitions, voltage ratings and interrupting rating tables along with the current carrying and temperature rise tests. It can be downloaded here.

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