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How to Select the Right Air Compressor Switch Replacement

All right. So what do we know about pressure switches? Most air compressors have them. They also tell the compressors when they should start and when they should stop. So do you think a functioning pressure switch is important? Right. They are.


Pressure switches come in different forms, and sometimes even different shapes. Some have fixed cut-in pressure point (pressure at which it closes) and cut-out pressure point (pressure at which it opens).  Others have a fixed pressure differential (difference between the cut-in and cut-out pressure) while the cut-in is adjustable. Of course on others, they are both adjustable.

You would be surprised to know that adjustable pressure switches are more expensive because they give you more freedom, compared to fixed pressure switches that are relatively cheaper.


How do you find a good replacement switch?

An exact replacement of the old one from the manufacturer is usually quite expensive. Your new pressure switch, however, does not have to be completely the same! Some say that it is cheaper to find your own replacement switch. What you need to remember though, is that the replacement should have the same maximum pressure and electrical rating.

Other Things that You Should Check Before Buying a Replacement:


On and Off Switch

Small compressors are switched on and off directly by the pressure switch. But usually, bigger compressors do not have a switch for on and off on their pressure switch. What they have is a separate control panel where you will find the control buttons. Yes. This is where you will find the on and off switch.


Physical Connections

Common connection sizes are ¼”, 3/8” and ½” NPT female. You can make use of an adapter, but of course it is so much easier to just buy a new switch that would fit directly on your compressor.


Unloader valve

You can often locate the unloader valve of piston or reciprocating compressors on the side or probably on the bottom of the pressure switch. When this is the case, then the new pressure switch that you should buy must be one with the same connections or it must come with an unloader valve. If your new pressure switch has an unloader valve, you have to be sure that they have the same physical compressed air connection.


These are some of the important things that you should look for and know when you are replacing your pressure switch. As you can see, it is not that difficult as you probably thought. They are standard components and you will definitely find one to suit your needs.

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