C45B mini circuit breaker is mainly suitable for avoiding overload and short circuit. It is especially used in illumination and distribution system of industry and commerce. Its appearance is small and exquisite, its capability is favorable and credible. It has high breaking capacity. The shell and parts are made of fire resistance and shock resistance plastics. It has a long life. It is mainly used for avoiding overload and short circuit of AC 50/60Hz rated voltage of single pole 240V and two, three or four poles 415V circuit. It can also be used for unfrequent switch on and off the electrical equipment and illumination circuit under normal condition.