There’s more than likely not a day the goes by whereby you don’t usage or encounter a border switch in ~ home, or at her workplace.

You are watching: What is the function of a limit switch

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Types of limit switches

There room 4 general species of limit switches:

1. Whisker

2. Roller

3. Lever

4. Plunger

Depending ~ above the application, a border switch might be a combination of 2 that the general varieties such as roller-lever.


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Limit move configuration"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true" data-et-multi-view-load-phone-hidden="true">Configurations of limit switches

Limit switches are available in numerous switch configurations: generally Open, generally Closed, or one of each.

Symbols of border switches","tablet":"Limit move symbol","phone":"Limit switch symbol"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true" data-et-multi-view-load-phone-hidden="true">Symbols of limit switches

Depending on the beginning of the electrical schematic, you may see limit switches drawn in various ways.

The global Electrotechnical board of directors (IEC) and also the National electrical Manufacturers association (NEMA) have slightly various symbols.


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Let’s have actually a look inside a microswitch that is a kind of border switch.

A microswitch has actually 2 border switches operation together and also sharing a common terminal. One border switch is typically open and the various other is typically closed. 

To be technically correct, the switch construction is Single Pole Double Throw, or typically referred to as SPDT.

The dashed line indicates that both switches room mechanically connected and also will run at the exact same time. 

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Microswitch straightforward circuit"}},"slug":"et_pb_text"}" data-et-multi-view-load-phone-hidden="true">Microswitch straightforward circuit

Alright, let’s connect the microswitch come a lamp circuit. In the inactive state, the Red lamp is on together the machine is no being operated by things pushing on the trigger.

When the trigger is driven the maker will activate, and also the green lamp will certainly come on.

Limit switches in action","tablet":"Limit switch in action","phone":"Limit move in action"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true" data-et-multi-view-load-phone-hidden="true">Limit switches in action

Now that you’ve viewed the border switch in action you are more than likely thinking around some that the applications where you have seen castle in action.

For example, you might see border switches operated by a container on an assembly line, or activate by a rotating device part or through any variety of other moving mechanical objects.

Limit switches can be offered to count passing objects, or determining the position of a hydraulic cylinder.

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Limit move vs. Proximity sensor","phone":"Limit switch vs. Proximity sensor"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true" data-et-multi-view-load-phone-hidden="true">Proximity sensor vs. Border switch

Limit switches space slowly starting to disappear from plenty of industrial applications. They room being changed by proximity sensors.

Unlike a border switch, a proximity sensor has actually no mechanical relocating parts.

A proximity sensor performs the switching activity with electronic switches.

Limit switches will not totally disappear any time shortly as they outshine your proximity switch counterpart in their ruggedness and reliable procedure in daunting environments.

Generally speaking, limit switches are qualified of managing much higher current worths than proximity sensors.

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Summary","phone":"Summary"}},"slug":"et_pb_text"}" data-et-multi-view-load-phone-hidden="true">Summary

OK, let’s review…

– There room 4 general species of border switches: whisker, roller, lever, and plunger.

– border switches room electromechanical devices operated by a physics force used to that by one object.

– A limit switch is an electromechanical device consisting of an actuator mechanically linked to an electrical switch.

– limit switches are obtainable in numerous switch configurations: generally Open, normally Closed, or among each.

– relying on the beginning of the electrical schematic, you may see border switches drawn in different ways.– limit switches are being changed by proximity sensors in numerous applications. 

If you have any type of questions about using limit switches, add them in the comments below and also we will certainly get ago to girlfriend in much less than 24 hours.

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By Ted Mortenson

Automation Engineer

Posted on Oct 19, 2020

By Ted Mortenson

Automation Engineer

Posted on Oct 19, 2020

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