What is the difference between an overspeed switch and a travel switch?

The core difference between an overspeed switch and a Limit Switch is that the monitoring objects and functional goals are completely different: the former monitors "rotational speed" to prevent overspeed hazards, while the latter monitors "mechanical position/travel" to control motion boundaries.

The specific differences can be clearly distinguished from the following three points:

1. Different monitoring cores

Overspeed switch: Only monitors the speed of rotating machinery (such as the revolutions per minute of motors and fans) to determine whether it exceeds the safety threshold.

Travel switch: monitors the physical position or travel of mechanical parts (such as the upper and lower limits of an elevator car or the end point of a machine tool slider) to determine whether the preset position has been reached.

2. Different functional goals

Overspeed switch: The core is safety protection. When the speed exceeds the standard, it triggers a shutdown or alarm to prevent the equipment from being damaged (such as motor burning) or causing accidents (such as elevator runaway) due to overspeed.

Limit switch: The core is limit control. When the component moves to the specified position, it triggers an action (such as stopping, reversing, starting the next process), realizing precise boundary control of mechanical movement.

3. Different typical application scenarios

Overspeed switch: mostly used in rotating equipment such as elevator traction machines, industrial motors, steam turbines, crane drums, etc.

Limit switch: mostly used for the limit position of elevator door/car, the end point of machine tool workbench, material positioning of automated production line and other linear/reciprocating motion equipment.