Among various firefighting devices, dry powder fire extinguishers are commonly found in homes, offices, factories, and other workplaces. Their wide applicability and easy operation make them ideal for tackling initial fires. Understanding the different classifications of dry powder extinguishers scientifically helps users make more reasonable choices for their specific needs.

1. Classification by Mobility Based on mobility, dry powder fire extinguishers can be divided into three types: portable, backpack, and trolley models. Portable extinguishers are the most common, easy to carry and operate, suitable for personal use. Backpack models are ideal for use in larger or more complex environments. Trolley types are designed for large-scale fire incidents and are often used in high-risk areas such as oil depots and chemical plants.

2. Classification by Extinguishing Agent According to the composition of the extinguishing agent, dry powder extinguishers are mainly divided into BC and ABC types. BC extinguishers, filled with sodium bicarbonate, are suitable for flammable liquid, gas, and electrical fires. ABC extinguishers use ammonium phosphate as the main agent, offering broader applicability, effectively combating solid, liquid, gas, and electrical fires, making them perfect for general-purpose settings.

3. Classification by Fire Type Extinguishers can also be categorized by the type of fire they tackle. Class A is for solid material fires, Class B for liquid fires, Class C for gas fires, and Class D for combustible metal fires. Most dry powder extinguishers are ABC type, but they are not suitable for metal fires.

4. Classification by Pressure Mechanism They are also divided into gas cartridge type and stored pressure type, depending on whether the propellant gas is stored externally or internally.

Choosing the right dry powder fire extinguisher is crucial for effective fire response and safety. It is recommended to select and maintain extinguishers according to specific environmental requirements, ensuring maximum protection when it matters most.