The term class on a transformer nameplate refers to what aspect of the transformer?

The term "class" on a transformer nameplate specifically refers to the type of cooling it uses. This classification indicates how the transformer dissipates heat and ensures reliable operation. Transformers can have different cooling classes based on the cooling medium and method employed, such as oil or air cooling, and this information is crucial for understanding the transformer's thermal performance and suitability for various applications.

For instance, a transformer classified with a specific cooling method will have different operational characteristics, including its ability to handle load changes and maintain temperature under varying environmental conditions. Knowing the cooling class allows electrical professionals to correctly select transformers for specific applications and ensure they operate effectively within their thermal limits.