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Your cart is empty. A capacitor is an electric component that temporarily stores an electrical charge. A dual "run capacitor" supports two electric motors, such as a fan motor and a compressor. Round dual run capacitors are used to start and run the unit more efficient. It saves space by combining two physical capacitors into one case. The dual capacitor has three terminals labeled "C", "FAN", and "HERM", which stand for the *C*ommon, Fan, and *HERM*etically sealed compressor.
Dual capacitors come in a variety of sizes, depending on the capacitance (µF = MFD = micro farad), such as 60 plus 5 µF, and also the voltage. A 440 volt capacitor can be used in place of a 370 volt, as it is build better, but the 370 can’t be used in place of a 440 volt. It will work for a while and will fail prematurely, as exceeding the capacitor's rated voltage will cause the dielectric to break down and the capacitor to short out. Same as an electric wire- 600V rated wire is better than 300V one .The capacitance(µF or MFD or micro farad) must be the same or stay within 10%+ or 5%- of its original value . Example: 40 µF cap can be substituted by 38 - 44 MFD with the same or better voltage ratings capacitor.
If your fan is working but compressor not, or the capacitor is bulged on top most likely your capacitor is defective. Round capacitor can be used to substitute oval shape one with the same MFD AND Volt specs.
You will ask “Why I need a Cap that is rated 440V in my A/C?”
Answer: You need to realize that a motor is an inductive device. When the supply voltage is applied to the motor run winding, the voltage across the start winding will be increased to a higher voltage value. A motor acts like a transformer with the run winding acting as the primary and the start winding acting as the secondary. This is why the capacitor has a much higher voltage rating than the 230 being the supply voltage.
If a Capacitor is not EIA-456-A approved means it is NOT approved for USA market.
Scott
2025-08-11 18:31:48
I got two of the PowerWell 40/5 MFD +/-6% capacitors. I received them on time and right away I measured them, the values were 40 and 5 MFD on both capacitors, which is fantastic since the values can vary +/-6% and they are still acceptable. The fact that they both were at 40 and 5 MFD was very impressive and it shows these capacitors are of high quality and the manufacturer pays attention to details and quality of their products.6 years ago, I bought two American made 40 MFD +/-5% motor run capacitors for over twice the price of these Powerwell caps. The nominal values of both caps were at 40.7 and 40.6 MFD which were well within the specified tolerance but I expected for such a high priced caps better quality control. The value should have been at 40 right out of the box. Of course, I installed them and they have been working for the past 6 years without any failure. They were guaranteed for 5 years. I replaced them since I do NOT want any failure in the middle of summer in Phoenix.As far as Powerwell caps, they have been working in my outside units for only a month. They have not gone through any summers yet. The summers (118 F) are brutal on motor run capacitors. Also, heat and time can change the value of the capacitor. So, my Powerwell caps have NOT gone through the time and the heat test yet. I hope they perform well during Phx's summers. I think they will, based on what I see so far. My outside units (heat pump) run very smoothly so far. I will update this review after a summer or two to let you know how these caps performed during harsh summers of Phx, AZ. At this point, I would definitely recommend them because they are priced very attractively and they have 5 years guarantee. In addition, they appear to be high quality. Also, best of all, they are filled with Caster oil and not PCB.
Don
2025-07-06 14:12:29
My AC unit stopped cooling so I did some trouble shooting before I called the service company. My unit is a split heat pump with one in the attic and the other outside. I checked the unit in the attic for an overflowed drain pan but didn't find one. The unit was running fine just blowing hot air. Next, I went outside. I could tell the compressor wasn't running. I opened the unit and manually engaged the relay but nothing happened. It was either the compressor or maybe the capacitor. I matched my old capacitor to this. It cost me $19.63 and that included the product, tax and overnight delivery. Next morning, I replaced the capacitor and turned the power on and my air condition came back to life!!! My cheapest A/C repair ever! Had I called the service company, their bill would have been in the hundreds. I replaced the capacitor over a month ago and the unit is still running fine. I'm happy!
Peter Consolo
2025-06-16 13:13:54
Its a easy task to do yourself and save yourself hundreds. Capacitors can fail for many reasons , very easy to replace *****Please use extreme caution if you do this yourself, a capacitor MUST BE DISCHARGED..!!FIRST pull your air conditioner breaker outside and or turn off the breaker inside your breaker boxRemove your AC access cover ..NOW VERY IMPORTANT check with a multimeter set to read VOLTAGE to make sure there is 0 voltage going to your AC unit THOSE THICK WIRES SHOULD "READ ZERO VOLTS" COMING INTO THE CONTACTOR ..Discharge your capacitor by using a VERY INSULATED screwdriver and jumping all the terminals together...Common, Herm, & Fan.. Make note of where the wires are on the original Capacitor or take some pictures.. IF YOU CANT SEE THE MARKINGS ON THE OLD CAP :MOST CAPS WILL HAVE 4 TERMINALS FOR COMMON, 3 FOR HERM , 1 FOR FAN.. remove wires from old cap one by one and install on your new Capacitor. Put everything back turn your power back on and you should be good to go....
NeutronFlux
2025-05-21 16:41:12
Buying through a repairman will cost you 3x more atleast. If you have an AC / SPA, best open compressor housing/ SPA morot cap cover and note values. Most have 2 for AC & just one for spa, a 5 mfd for starting the fan motor and a 40, 50 or 60 etc. for the compressor. Having a spare in the garage can save hundreds of dollars and keep the wife happy if you swap it out and get ac up and running fast. Always kill power from breaker then short common to each of the other leads before touching or removing wires. Very Important!!! Note which color wires go to HERM etc. on the cap, before removal. You don't want to put them on the wrong side! When compressor fan stops working turn off ac immediately to prevent burning out the fan motor or compressor. If you know what to listen for, you can hear the fan running when ac starts up, if it isn't running the cap is probably bad. Alternatively if it is running and ait is hot could be compressor side of cap. I have replaced my AC cap 3x in the last 17 years and my contactor once, but after 20 years the AC is still humming. I used this cap as a temp meaure for my spa pump until the 40mfd caps came in (delayed availability). Worked great and installed the correct one when it arrived 2 weeks later. Did not need the 5 mfd side for spa pump. Now have a spare 40+5.
Annie Seldner
2025-05-05 17:40:16
Keep a spare capacitor on hand. This $20 item can save you a $400 repair bill and the wait for service if you are at all willing to remove your fuse, open your AC compressor unit and swap out the capacitor.
Shady Artin
2025-04-25 11:38:23
It's installed now for 2 month and working just fine
Frank manuel
2025-03-27 14:41:10
Works perfectly no problems been 5 weeks. Feels nice and cold inside.
chicagodad
2025-03-18 12:01:42
My electrician replaced the original part with this one and it fixed the problem with my Lenox AC unit . The original unit was leaking and would not start the AC.
Customer
2025-02-23 11:52:42
It simply works on my AC unit.
Denis Savard
2025-02-15 10:35:15
Parfait
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