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I've searched for the numbers, 2001-42 and TW9569 and not finding anything. How would you go about searching for this type of replacement capacitor?

It came from an American Standard Jacquzzi/whirlpool motor that hums when I try to turn it on. I can't seem to find just this part on their website, they only sell the whole motor for e.g. $200.

enter image description here

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    \$\begingroup\$ FYI you may find those large capacitors at shops catering to HVAC repair, as air conditioners often have a capacitor serving the identical function (startup of compressor motor). \$\endgroup\$
    – Ben Voigt
    Sep 27 at 16:40
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    \$\begingroup\$ These may help. There's no 30uF capacitor in them, but 27u or 33u may work. \$\endgroup\$ Sep 27 at 16:50
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    \$\begingroup\$ @user28910 They are aluminum but not electrolytic, even though Digikey located them intentionally under aluminum electrolytic capacitors. And their intended application is Motor Start. Check the series datasheet. \$\endgroup\$ Sep 27 at 18:56
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    \$\begingroup\$ @Rohat Kilic They are aluminum electrolytic but non-polarized. They are exactly what is needed. A polarized electrolytic would be instant failure not a poor substitute. The 33uF 330V would be my choice, \$\endgroup\$ Sep 27 at 19:51
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    \$\begingroup\$ 2001-42 may well be the manufacturing date, the 42nd week of 2001 \$\endgroup\$ Sep 28 at 14:51
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The things you didn't search for are all the things you should have searched for:

  • Capacitance 30µF (some vendors use uf so you don't have to type the special symbol).
  • Voltage 300 VAC (It's OK to get one rated for a higher voltage.)
  • Temperature limits -25°C/+70°C
  • Frequency, 50/60 Hz. (Probably not an issue if this isn't specified as long as you're selecting a capacitor for motor starting)

You might also need to select the physical size/shape to fit into the enclosure, as well as the termination type.

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  • \$\begingroup\$ This is really useful, I forgot to mention I did search for 300vac but did not search the capacitance, temp limits or frequency. \$\endgroup\$ Sep 27 at 17:00
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    \$\begingroup\$ Please mention that the voltage can be 300 VAC or higher. \$\endgroup\$
    – winny
    Sep 27 at 17:07
  • \$\begingroup\$ Thanks again, now I am wondering if someone else already used a higher one, and maybe I can get a 240VAC one etc. I am going to try to find the electronic schematic for the motor and see if it is somehow specified. \$\endgroup\$ Sep 27 at 17:37
  • \$\begingroup\$ I also see a tool called the Capacitor Wizard, which is too pricey for this project right now, but looks like it can determine what capacitor to use if one doesn't know. \$\endgroup\$ Sep 27 at 19:50
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    \$\begingroup\$ You should never use a smaller one. 240VAC peaks at 340 V, so never go below the ratings that come installed in the device or you're making yourself a fire hazard. \$\endgroup\$ Sep 28 at 12:06
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Did a little parametric search on digikey.

Not the same, but will work just fine.

The product i selected

The parametric search

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    \$\begingroup\$ Thanks, I just saw in another video that I can use a 460VAC in a 300VAC use case, but no vice versa. So the product you selected (460VAC) should work for my 300VAC use case, right? \$\endgroup\$ Sep 27 at 17:00
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    \$\begingroup\$ @ElijahLynn No issues with higher voltage rating. \$\endgroup\$
    – winny
    Sep 27 at 17:09
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    \$\begingroup\$ @ElijahLynn The voltage rating is how much it can take before failing. A higher voltage rating on a capacitor is never a problem. \$\endgroup\$ Sep 28 at 1:43
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The capacitor pictured is a non-polarized electrolytic motor start capacitor. You can find such capacitors by searching "motor start capacitor." The capacitor selected by @ElectronicsStudent appears to be a metalized polypropylene, motor run capacitor. I believe that a motor run capacitor can be safely substituted for a motor start capacitor (but not vice versa). However, the motor run capacitor will tend to be a bit larger. Motor start capacitors have voltage ratings comfortably above the supply voltage. It is not a good idea to substitute a capacitor with a lower voltage rating than the one that had been used.

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    \$\begingroup\$ Thanks for explaining the differences between the two. I wasn't sure what to make of the motor run capacitor looking so different so that makes much more sense. \$\endgroup\$ Sep 27 at 19:51

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