The product adopts a pole-mounted installation design with a compact structure and light weight, saving installation space and facilitating on-site construction and later maintenance. Equipped with a high-performance spring operating mechanism, it has small operating energy and reliable action, with a mechanical life of more than 10,000 operations, no frequent maintenance required, and greatly reduces operation and maintenance costs. With a rated current of 630A and a rated short-circuit breaking current of 20kA, the circuit breaker has excellent breaking performance and insulation performance. It can be widely used in urban and rural distribution network transformation, industrial and mining enterprise power distribution, photovoltaic/wind power new energy station supporting facilities, and 10kV distribution line protection and control of key facilities such as railways and airports, providing reliable guarantee for the safe, stable and efficient operation of the power system.