It is suitable for circuits with AC 50Hz, rated working voltage below 230V/400V, and rated working current up to 125A. It uses mechanical methods to separate the moving and stationary contacts of small circuit breakers when breaking the circuit. When closing, opposite mechanical movements are used to close the moving and stationary contacts. During the operation of connecting and disconnecting the load circuit, an arc will be generated between the static contact and the moving contact. It is used for overload and short circuit protection of office buildings, residential buildings and building lighting, distribution lines and electrical equipment, as well as infrequent switching of lines. It can protect lines and power equipment from damage. Its structure is advanced, performance is reliable, breaking capacity is high, and appearance is beautiful and compact