Torque Limitor is a mechanical safety device used for overload protection. It is installed between the driving and the driven component. The driving and the driven components are engaged with each other through a set of hardened and ground alloy steel balls and are pressed against each other by an adjustable spring force. Whenever the driven component gets overloaded, the driving member moves axially against the set spring force and slips, thereby engaging in the next ball groove. This axial movement can be sensed by a limit switch to send a signal to cut off the main drive.