In the electrical control system, the function of the limit switch is to detect the sequence control, positioning control and position state. Travel and limit protection for operating machine equipment.

Limit switches, also known as travel switches, can be installed on relatively stationary objects (such as fixed frames, door frames, etc.) or moving objects (such as cars, doors, etc.) referred to as animals).

When the animal approaches the still life, the connecting rod of the switch drives the contact of the switch, thus closing the closing contact or disconnecting the contact. The circuit and motor are controlled by changes in the connection and disconnection states of the switching contacts.

In the actual production process, the limit switch application is installed in a pre-arranged place.

When the module installed on the moving part of the production machinery encounters the travel switch, the contact of the limit switch moves, thus enabling the switching of the circuit. Therefore, the stroke switch is an appliance that switches the circuit according to the stroke position of the moving part, and its working principle is similar to a button.