Starting Torque Limiters are designed for soft starting of 1 and 3 phase AC motors. It is easy to install in between motor starters and motors. It is a ball pressing mechanism. It offers to press a ball by a spring into a round hole. They have a smaller diameter than the ball formed at the end surface of an input member of the torque limiter main body. It is designed to actuate accurately when the load torque exceeds a specific value. They have rotation limiting means for limiting the relative rotational angle of the input member and output member within a specific angle. The main body is put in action, and positioning mechanism for positioning the output member in cooperation with the action of the torque