An air circuit breaker (ACB) is a type of circuit breaker that uses air as the interrupting medium to interrupt and break the circuit during a fault or overload condition. An air circuit breaker is designed to overcome defects and safeguard the machine before it breakdowns.
ACBs consist of a set of contacts that open and close when the breaker is operated. The contacts are housed in a metal enclosure, which is filled with air as the interrupting medium. The breaker is designed to quickly and safely interrupt the circuit when a fault occurs, preventing damage to the equipment and reducing the risk of electrical hazards.
ACBs can be manually operated, typically with a handle or lever, or can be automatically tripped by protective relays that sense fault conditions.
The main function of the air circuit breaker is to: