With a rated current from 1600A,1250A,800A and rated operational voltage 415V, 690V, 50Hz, the NA8G series air circuit breaker is mainly used in the distribution network to distribute electric energy & protect lines and power equipment from being damaged by overload, under voltage, short circuit, single-phase grounding & other failures.Having art-oriented appearance, high breaking capacity,zero arcover and varities of intellectualized protection functions, that breaker can be used for selective protection with accurate action, no unnecessary power cut, and better power supply reliability.The product allows the wire to enter or enter from the lower port,& the open frame (draw-out) circuit breaker has isolation function.That breaker can be widely used for power stations,factories,mines etc.