What is an ACB?
Air Circuit Breaker is a device used to provide Overcurrent and Short Circuit Protection for circuits ranging from 800 Amps to 10000 Amps.
One should not be confused between Air Circuit Breaker and Air Blast Circuit Breaker.
Air Circuit Breakers are usually used in low voltage applications below 450 volts. You can today find these in Distribution Panels (below 450 volts).
Air Blast Circuit Breakers are high capacity breakers and can be seen in old substations mainly above 132 kV. The working principle of these two circuit breakers are quite different. Here we will only discuss the working of Air Circuit Breaker (ACB).