Limit Switch Applications Types & Functions

If you work with electrical machinery, then you’ve most likely detected the term “limit switch” before. But what exactly is it? And what's the operate of a limit switch? Below, we offer you with a basic summary of what limit switches ar, their applications and how to use them.

What Is a Limit Switch?

A limit switch is a piece of electromechanical equipment that’s made up of an actuator connected to a series of contacts. These contacts permit the limit switch to observe the presence and proximity or absence of a fabric or object, usually in industrial settings. Based on what the contact detects, the sensor moves an actuator, which in turn changes the state of an electrical circuit. This movement signals that some predetermined ‘limit’ has been reached.

Because limit switches mechanically observe preset limits, they eliminate the need for human workers to monitor those levels. This change makes operating everything from heavy machinery to industrial conveyor belts not only much easier and more precise but also much more reliable. As a result, production becomes more efficient, and work environments become safer.

Uses of a Limit Switch

Limit switches ar usually wont to tally items or materials so once a limit is reached, the switch closes or opens. This condition is usually the case in industrial applications like assembly lines. For example, once the limit switch during a specific piece of apparatus detects that it's added  a preset variety of parts to a product, the switch moves the actuator, that successively moves the piece of kit away, and the product goes on to the next station.

Limit switches may be used as safety interlocks to stop machine parts from moving any more once a particular purpose is reached. A good example of this is an automatic garage door. Without a limit switch that stops the door when it reaches the bottom rail, the door would keep moving downwards and eventually crash into the ground, causing serious damage.

Limit switches can also be used as part of a larger control system. When a certain limit is reached, the actuator can de-activate or activate a device to prevent malfunctioning or emergencies.

Types of Limit Switches

The performance of a limit switch can depend upon some factors. They include a mounting method, size, force capacity of the switch and the stroke rate used during the operation. It’s essential for the limit switch rating to match its supposed use. The major types of limit switches used in the industries are:

1- Snap Switches

Used in an application that requires basic contact parameters. It does or doesn’t need an operator.

2- Miniature Enclosed Reed

This limit switch is created from formed Zinc; it’s also referred to as kind XA. It’s suited for applications that require elevated environmental stresses.

3- Heavy Duty Precision Oil-Tight

Also called the type C limit switch, it’s very reliable due to its long mechanical and electrical lifespan.

4- Heavy Duty Oil Tight and Foundry

The significant duty oil tight and foundry is majorly utilized in factories and mills.

5- Gravity Return

Generally used in the production line and conveyor operations involving small light components. There ar completely different varieties like the lever type, roller-type, and roller type.

How to Use a Limit Switch — operational Principle

The limit switch operational principle is very easy, but as you can tell from the examples above, it’s integral to a host of industrial and commercial mechanical operations. Its most simple use is to prevent, stop, start or speed up operations. You can integrate a limit switch into a large range of mechanical device applications starting from residential garage doors to material handling in warehousing and distribution.

Limit Switch Supply

Various types of limit switches exist, including:

Snap switches

Heavy duty oil-tight switches

Gravity return switches

Safety locking and unlocking switches