A zero-speed switch, also known as a speed sensor or overspeed switch, is an industrial safety device used to monitor the speed of rotating equipment and machinery, particularly in critical applications where overspeed or a complete loss of speed can lead to dangerous conditions. These switches are essential for ensuring safe and efficient operation in various industrial processes. Here are the key features and functions of zero-speed switches.

The Zero Speed Switch is a self-contained device that detects and sends output alarms for machinery operating at low or no speed, as well as early jamming detection. Early detection of the under-speed condition is beneficial in reducing downtime caused by jamming or transmission failure, particularly in the case of medium and large motors.