Understanding The Function of a Limit Switch

13th November 2022

A limit switch is a type of electronic switch used to detect the movement of objects in an industrial setting. A limit switch allows presence sensing, which is the act of detecting the presence or absence of an object with a contact or non-contact device. This component is named limit switch because of how it operates. When an object (or target) comes into touch with the switch operator, it finally moves the actuator to the “limit”, where the electrical connections change state.

As the name suggests, a limit switch defines the endpoint or limit over which an object travels before it comes to halt. This switch gets engaged to monitor travel at this point.

In simple words, limit switches are used to restrict or limit unwanted movements, thereby limiting any equipment damage. In addition, these limit switches operate mechanically and are capable of managing higher currents due to their heavy-duty contacts.


How Does a Limit Switch Operate?

In order to clearly understand the operations of a limit switch, you can just look around appliances in your home. Limit switches are found in many home appliances, including refrigerators; when the door is opened, the light inside instantly turns on, and when the door is closed, it shuts off. This is possible only because of a limit switch. The switch is triggered when the door is opened, sending an electrical current to the light. When the door is shut, the opposite occurs.

Limit switches are used in manufacturing settings as well; mostly employed as control devices and safety devices for both machines and the people operating them. These are inexpensive and critical pieces of electrical equipment since they create a link between the electrical and physical domains.

A limit switch is an electromagnetic device that uses physical interaction to convey an electronic signal. Limit switches detect the presence of items, allowing the system to perform the specified action.


Benefits of a Limit Switch

Following are some of the benefits of a limit switch:

  • It can be used in practically any industrial setting.
  • In terms of accuracy and repeatability, it is quite exact.
  • Use very minimal electrical energy.
  • Can switch large inductance loads.
  • Can manage several loads.


Uses of a Limit Switch

Limit switches are commonly found in elevators for position detection, safety and operational state of the elevator. Apart from this, a limit switch can be found in many appliances in households and manufacturing settings. The applications of limit switches can be separated into the following categories:

  • Product Detection: Limit switches are used in settings which require regular count and product detection in their operations. The limit switch conveys a signal to the control system as soon as the product pushes against it.


  • Personnel Safety: It can be used to detect the opening of a safety guard, which causes the machine to de-energize entirely. The machine comes to a halt when the guard is opened during operation. The limit switch is utilized in both circumstances to protect the operator from potential danger.


  • Preserves Machinery: Limit switches are also used to protect the machinery from damage. The components more prone to damage or gradually wear down are the motor clutch, gears, shift etc.


Get The Best Quality Limit Switches

Limit switches are an integral part of various applications across the production floor as well as in households. They ensure the safety of the people operating on machinery as well as ensure a long life for the machinery as well. When looking for sellers, make sure they provide guarantees on their products as well as provide quick assistance in times of need.