ISI Marked Type. Safe For Use On Live Electrical Equipment. Controlled Discharge. Supplied with Wall Bracket. ABC powder-type fire extinguishers are suitable for extinguishing fires caused by Class A (solid combustibles such as paper, wood, and cloth), Class B (flammable liquids such as gasoline, oil, and grease), and Class C (electrical fires) sources. ABC powder-type fire extinguishers are highly effective in quickly extinguishing fires. They work by interrupting the chemical reaction that sustains the fire, and cooling the flames and the fuel to prevent re-ignition. ABC powder-type fire extinguishers are easy to operate and can be used by anyone without specialized training. They are equipped with a simple operating lever that releases the extinguishing agent.