Definition and classification of air circuit breaker

Air circuit breaker (automatic switch): A circuit breaker. Insulating medium is air. A manually (or electric) closing, with the closing position to maintain lock by acting on the tripping mechanism and having an arc extinguishing device tripping pressure switch, is being widely used below 500V AC and DC devices in the circuit in as connected, breaking and carrying rated current and short-circuit and overload fault currents. When the circuit from Electric energy meter, short circuit, the voltage electri cenergy meter or disappeared, can automatically cut off the circuit for reliable protection. Breaker dynamic and static contact and touch bar design pattern varied, but to improve the circuit breaker breaking capacity is the main purpose. Currently, the use of certain contact structure, mcb circuit breaker the short-circuit current limiting peak limiting principle, to improve the breaking capacity of the circuit breaker has a significant role, and are widely used.
ACB has said automatic air switch, used to making and breaking load circuit can also be used to control the infrequent start motor. From a functional perspective, it is equivalent to knife switch, over-current relay, loss of voltage relays, thermal relays and other electrical leakage protection function of some or all of the sum of the short circuit, overload, under voltage and leakage protection and so on.