Working principle of air circuit breaker

Question

Accepted Answer

An air circuit breaker is an electrical device that provides protection against overcurrents by using air as the medium to extinguish the arc.

Air circuit breakers work on the principle of thermal and magnetic tripping.
When an overcurrent flows through the circuit, the bimetallic strip in the breaker heats up and bends, causing the contacts to open.
The arc generated during the opening of contacts is extinguished by the blast of compressed air.
Air circuit breakers are commonly used in low voltage applications, such as in residential and commercial buildings.
They are capable of interrupting large fault currents and provide reliable protection for electrical systems.

Accepted Answer

air circut brekar can trip in faulty condition and arc is extugushe by using air

Top Logicon Facility Management Electrical Maintenance Engineer interview questions & answers