A safety coupling can also be called a torque coupling or a torque coupling. It is actually a standard torque limiter plus a half-section common coupling. Under normal conditions, it acts like a common coupling. The function of connecting the two shafts and the eccentricity compensation function of the coupling, but once the transmission end is overloaded, the function of the torque limiter starts to be realized, and it will disconnect the driving end from the transmission end and play a protective function.