Limit Switches

More Information about Limit Switches

The durability and reliability of mechanical limit switches make them ideal for heavy-duty applications. Limit switches are used in locations where object detection would be challenging for other types of sensors.

Limit switches come in different sizes and types, from micro limit switches for small-scale applications to larger, more robust switches for heavy machinery. Their installation varies based on the application, but they are often fixed in place and wired into the machinery's control circuit. In some cases, the actuator is designed to return to its original position after being triggered, allowing for repeated use.

In terms of electrical connections, limit switches can be wired into a circuit in various ways, either to break or complete the circuit when triggered. The wiring can be through direct cable connections or terminal connections, depending on the specific design of the switch.

FAQs

How does a limit switch work?

A limit switch works by converting a physical motion into an electrical signal, which is typically used to control electrical machinery.

Limit Switch Basics 

What are limit switches?

Limit switches are electromechanical switches that operate based on the movement or presence of an object. They are designed to detect the presence of an object using an actuator connected to a series of contacts to detect the presence and proximity or absence of a material or object. When the switch's actuator is moved by an object it will change the state of an electronic contact set. This movement signals that some preset limit has been reached. There are many different ways a switch can be actuated depending on the type of switch that is being used. Some use a roller and lever, some use a button or plunger, while others might use a rotating arm and rod attached to the main body of a switch. The type of switch that is used will largely be dictated by the specific application.

Where are limit switches used? 

Limit switches can be used to tally or count items, so that when a limit is reached, the switch will open or close. This open and closing action can be counted by a controller allowing the action to be totalized. Limit switches can be used as safety interlocks to prevent machine parts from moving any further when specific point is reached. Limit switches are also commonly used in larger control systems. For example, when a certain limit is reached, the actuator can deactivate or activate a device to prevent it from malfunctioning.