What type of extinguisher is represented by a solid blue circle?

A solid blue circle on a fire extinguisher represents a Class C fire extinguisher. Class C fire extinguishers are specifically designed to combat fires that involve electrical equipment, which can include appliances, tools, and other electrical wires.

The blue color coding is part of a standardized identification system that helps firefighters and the public easily recognize the appropriate extinguisher for various types of fires. Class C extinguishers typically use non-conductive agents, which prevents the risk of shock when used on electrical fires. Understanding this classification is crucial for safety, as using the wrong type of extinguisher on an electrical fire could exacerbate the situation, potentially causing injury or further damage.

The other classifications serve specific purposes, like Class A for ordinary combustibles, Class B for flammable liquids, and Class D for combustible metals, but they do not relate to electrical fires as Class C does.