Which NEMA symbol corresponds to a fuse?

The NEMA symbol that corresponds to a fuse is correctly identified as III. This symbol is used to indicate the presence of a fuse in electrical diagrams and specifications.

NEMA (National Electrical Manufacturers Association) developed these ratings and symbols to establish a consistent standard for electrical enclosures and devices. The symbol III is distinctly associated with fuses in the context of electrical systems, indicating that it is designed to provide overcurrent protection. Fuses act as an essential safety mechanism, breaking the circuit when an excessive current flows, thereby preventing equipment damage or electrical fires.

Understanding the application and appropriate use of NEMA symbols is critical for professionals in the electrical industry, as it aids in correctly interpreting electrical schematics and ensuring safe electrical installations.