U.S. Seal RD-50-370 run capacitor, 50 MFD 370 voltsU.S. Seal Run Capacitor 50 MFD 370V In stock$4299
U.S. Seal RD-50-370 run capacitor, 50 MFD 370 volts
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U.S. Seal Run Capacitor 50 MFD 370V

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$4299
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Quick overview

  • 50 MFD at 370V The two ratings that have to match the capacitor you are replacing.
  • Run capacitor Stays in the circuit while the motor runs, unlike a start capacitor that drops out.
  • Sized 2" by 3-3/4" Measure the can before ordering so it fits the bracket or the cover it lives under.
  • Wide cross reference The source lists a long set of substitute part numbers from other suppliers.
  • U.S. Seal supplied Sold under the U.S. Seal name as part RD-50-370.
  • Discharge before you touch it A capacitor can hold a charge with the power off, so cut power and discharge it before removing the old one.
Full description and specifications ↓

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Product details

This is a run capacitor rated 50 MFD at 370 volts, supplied by U.S. Seal as part RD-50-370. The can measures 2" across by 3-3/4" tall.

Matching the part

A run capacitor is chosen by two numbers, the capacitance in MFD and the voltage rating, both of which are printed on the side of the old part. Both have to match, with the one exception that a higher voltage rating is acceptable and a lower one is not. The source also carries a set of substitute numbers used by other suppliers, including RD50370, 3190029, 17586350, 319-0029, 628318313 and 628318-313, which is useful when the number stamped on your failed capacitor is not the U.S. Seal one.

Before you start

Cut power at the breaker and discharge the capacitor before you touch the terminals. A capacitor holds a charge after the motor has stopped, which is the part of the job that catches people out. If the motor hums but will not spin, or starts slowly and runs hot, the capacitor is a common cause and a cheap thing to rule out.

Specifications
Brand U.S. Seal
Manufacturer part number RD-50-370
Alternate part number 12725
Capacitance 50 MFD
Voltage 370V
Dimensions 2" x 3-3/4"
Substitute part numbers RD50370 ESS, 3190029 WAT, 17586350 MTK, 319-0029 WAT, 628318313 AOS, 628318-313 AOS, 175863-50
Type Run capacitor
Shipping weight 0.4 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

How do I know this is the right capacitor?
Match both numbers printed on the old can: the capacitance in MFD and the voltage rating. This one is 50 MFD at 370 volts.
Can I use a 370V capacitor where a 440V one was fitted?
No. Fit a capacitor with the voltage rating the original carried or higher, never lower. The MFD value has to match.
What are the substitute part numbers for?
They are the equivalent numbers other suppliers use for the same capacitor, listed so you can confirm a match when the number on your old part is not RD-50-370.
Is it safe to swap myself?
Only with the power off at the breaker and the capacitor discharged first. A capacitor stores energy after the motor has stopped, and the terminals can still bite.
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