C45N series circuit breaker is used in lighting distribution system or motor distribution system for protetsing overload and short-circuit in the system The produts is novel in strutsure, light in weight, reliable and excellent in performance. It has high breaking can trip quickly and it's installation uses with guide, it's case and body are adopted with high fire-registrant and shockproof plastics. The produts, with long life, is mainly used in AC 50HZ/60HZ single-pole 240V or two, three, four-pole 415V circuit for overload and short-circuit protetsion as well as for unfrequented on-and-off switching eletsric equipment and lighting circuit in normal case, This produts conform to GB10963, IEC60898 BS3871.