HS series speed sensors are widely used in rail train traction systems and braking systems, providing a large number of products for the first and subsequent large speed increase of China railway. In recent ten years, with the development of high-speed railways, HS series Hall speed sensors have been widely used in the ATP signal system of high-speed EMU, with CTCS-300T, CTCS-300H, CTCS-300S and other mainstream ATP systems selected, and the annual sales volume exceeds 3000 sets. It has characteristics such as stable operation of equipment, good customer response and high market share.