Travel switch, also known as position switch (also known as limit switch), is a commonly used low current main control device. By using the collision of moving parts in production machinery to make their contacts move, the control circuit can be connected or disconnected to achieve certain control objectives. Usually, such switches are used to restrict the position or stroke of mechanical motion, causing the moving machinery to automatically stop, reverse, change speed, or automatically move back and forth according to a certain position or stroke.

In electrical control systems, the role of position switches is to achieve sequential control, positioning control, and detection of position status. Used for controlling the travel and limit protection of mechanical equipment. Construction: Composed of an operating head, contact system, and housing.

In actual production, the travel switch is installed in a pre arranged position. When the module installed on the moving parts of the production machinery collides with the travel switch, the contact of the travel switch moves, realizing the switching of the circuit. Therefore, a travel switch is an electrical device that switches circuits based on the travel position of moving parts, and its working principle is similar to that of a button.

Travel switches are widely used in various machine tools and lifting machinery to control their travel and provide terminal limit protection. In the control circuit of the elevator, the travel switch is also used to control the speed of opening and closing the car door, the limit of automatic door opening and closing, and the upper and lower limit protection of the car.

The travel switch can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as static objects) or moving objects (such as vehicles, doors, etc., referred to as animals). When an animal approaches a still object, the connecting rod of the switch drives the contact of the switch to open or close the closed contact. Control the operation of circuits and mechanisms by changing the on/off state of switch contacts.