What is FR3 oil used for in transformers?

FR3 oil transformer is a natural ester-based insulating fluid primarily used for its excellent dielectric properties and environmentally friendly characteristics. It provides superior thermal stability and high fire safety compared to traditional mineral oils, making it ideal for transformers operating in critical applications. FR3 oil effectively cools and insulates transformer components while also offering additional benefits such as reducing maintenance and extending the lifespan of the transformer. Its biodegradable nature supports environmental sustainability, making FR3 oil a preferred choice in modern transformer applications.