A CO2 extinguisher puts out fire by displacing oxygen and cooling, and leaves no residue, which is why it is chosen for electrical equipment and flammable liquid (class B) fires. Balaji's portable units come in 4 kg and 4.5 kg, with a squeeze grip valve, a rubber hose and a fire rating of 55 B. Balaji lists ISI, BIS, ISO and CE for its portable CO2 extinguishers.
For larger areas, Balaji lists a 9 kg trolley mounted CO2 extinguisher with a manganese steel cylinder, a squeeze grip valve, a 55B rating and a discharge time of more than 20 sec, marked ISI. A second trolley CO2 listing gives no further details, so we confirm its size with Balaji when you enquire.
Place CO2 extinguishers close to the electrical risk they protect. CO2 cylinders are refilled after any use, and FPS handles refilling and routine checks as part of maintenance.