Will this unit work with a Campbell Hausfeld Model WL600701

Jim - The universal pressure switch will work on any compressor whose tank has a two wire motor connection, male 1/4 pipe thread tank fitting, and unloader connection to the compressor. It starts the compressor at around 90 psi. and shuts off at about 125 - 130 psi. Hope this helps. :)

can it run on 240 volts?

Hopefully I can help clear up the confusion on 120 vs 240 volts here. This pressure switch is a purely mechanical device, and should work just fine for 120 or 240 volt, like almost any other electric air compressor pressure switch. For 120 volt operation, you will wire line and neutral from the cord/breaker box/power source to the two terminals, and the load terminals will go to your motor. For 240 volt operation, you will instead wire L1 and L2 (two hot leads from a double pole breaker in a standard US 120/240 volt split phase panel) to the two line terminals on the pressure switch, and the two load terminals will be wired to your motor, OR to your magnetic motor starter in the case your motor is very large and/or not thermally protected. In response to the other individual who brought up amp draw, be aware that using 240 volt to power a motor that can be used at 120 or 240 volts will actually use *half* the amperage that would be otherwise be required at 120, and is one of the primary reasons for using 240 volts to power demanding appliances like air compressors. For example a 2 HP air compressor will take about 15 amps at 120 volts, or 7.5 amps at 240 volts. This means you can use higher gauge (smaller/thinner) cables, which costs less and ensures less of a voltage drop at the load. **Note that you will need to change the wiring of the motor if you are attempting to convert a 120 volt air compressor to 240 volt, and that not all motors are designed for this. The motor itself should have a low voltage and high voltage wiring diagram on the label of the motor (or in the instructions) which tells you how to wire the motor for either 120 or 240 volts, in this case** In conclusion, yes, any purely mechanical double-pole contactor or pressure switch can probably be used for either 120 or 240 volt, *assuming the connected load is designed for the voltage you are using*. An example of a switch NOT designed for 240 volts in the US/on a split phase system, is a one-pole switch or contactor, think of a typical light switch. This is because in the US, each hot lead has a voltage differential of 120 volts to ground, or 240 volts line to line. Therefore you must disconnect both hot leads from the load to truly isolate power from any given load.

will this switch work on a central pneumatic 21 gal. 2 1/2 hp compressor from harbor freight?

As long as your unloaded line is facing the same direction and your compressor is rated for the same psi, it should work. I am assuming that your compressor is 110v and single phase for home use. It worked great on a 30 gallon compressor I have. Still waiting to fix my 60 gallon one.

ASIN	B00QHZPUKC
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#95,980 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #36 in Air Compressor Replacement Parts
Brand	LEFOO
Color	Black
Compatible Hose Diameter	0.25 Inches
Customer Reviews	4.4 4.4 out of 5 stars (3,307)
Date First Available	March 30, 2009
Included Components	1 Pressure Switch
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	13.6 ounces
Item model number	LF10-4H-1-NPT1/4-95-125
Manufacturer	lefoo
Material	Metal, Plastic
Maximum Operating Pressure	150 Pound per Square Inch
Model Name	LF10-4H-1-NPT1/4-95-125
Part Number	LF10-4H-1-NPT1/4-95-125
Power Source	Electric
Product Dimensions	3.94"L x 3.54"W x 3.94"H
Style	Electric Compressor Pressure Switch With 4 Ports And Unloader Valve
Switch Style	Pressure Switch
Switch Type	4 way
UPC	703570490515 700425107048
Voltage	120 Volts

Lefoo Quality Air Compressor Pressure Switch Control 95-125 PSI 4 Port w/Unloader LF10-4H-1-NPT1/4-95-125

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