# US Seal RD-20-370 Run Capacitor – 20 MFD 370VAC

### Maintain Smooth, Efficient Operation in Pool & Spa Motors

A motor run capacitor plays a critical role in keeping pool pumps and spa motors running efficiently once they are started. The **US Seal RD-20-370 Motor Run Capacitor** is designed to provide stable electrical support during continuous operation, helping motors run cooler, quieter, and more efficiently. Rated at **20 MFD and 370VAC**, this OEM-grade capacitor is a dependable replacement for worn or failing run capacitors in pool pumps, spa motors, and blowers.

When a run capacitor begins to fail, motors may overheat, lose efficiency, or shut down unexpectedly. Replacing it with the correct capacitor helps protect your equipment, reduce electrical stress, and extend motor life.

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### Designed for Continuous Pool & Spa Motor Operation

Unlike start capacitors, run capacitors remain engaged while the motor is operating. Pool and spa motors rely on them to maintain proper phase balance and electrical efficiency during long run cycles. The US Seal RD-20-370 is engineered specifically for these demands, making it ideal for residential pool equipment exposed to heat, vibration, and frequent use.

This capacitor is commonly used in **single-phase pool pump motors**, spa motors, and blowers that require a 20 MFD run capacitor rated at 370VAC.

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### Why the Correct Run Capacitor Matters

Using the proper motor run capacitor ensures consistent motor performance and prevents premature equipment failure. An incorrect or degraded capacitor can cause overheating, reduced flow, and increased electrical consumption.

**Why it matters:**

-   Helps motors run cooler and more efficiently
    
-   Reduces electrical strain during continuous operation
    
-   Prevents unexpected shutdowns and motor damage
    
-   Extends the service life of pool and spa motors
    

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### OEM-Grade Quality from US Seal

US Seal is a trusted manufacturer of pool equipment components, known for producing reliable, durable electrical parts. The **RD-20-370 motor run capacitor** is built to OEM specifications, offering consistent capacitance output and moisture-resistant construction suitable for pool and spa environments.

This makes it a reliable replacement choice for both professional service technicians and pool owners performing preventative maintenance.

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### Compatibility & Common Applications

The US Seal RD-20-370 motor run capacitor is commonly used in:

-   Residential pool pump motors
    
-   Spa and hot tub motors
    
-   Pool and spa blowers
    
-   Single-phase electric motors requiring a 20 MFD, 370VAC run capacitor
    

Always verify your motor’s required MFD and voltage rating before installation.

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### Installation Notes

Always disconnect power before servicing pool or spa motors. Motor run capacitors store electrical energy and should be handled with care. If you are unsure about diagnosing capacitor issues or selecting the correct replacement, professional installation is recommended.

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### Product Specifications

Specification

Details

Product Name

US Seal RD-20-370 Motor Run Capacitor

Capacitance

20 MFD

Voltage Rating

370 VAC

Capacitor Type

Motor Run Capacitor

Application

Pool pumps, spa motors, blowers

Motor Type

Single-phase

Brand

US Seal

MPN

RD-20-370

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### Buy with Confidence from Benchmark Pool Supply

When you purchase the **US Seal RD-20-370 Motor Run Capacitor** from Benchmark Pool Supply, you’re working with a local pool equipment expert who understands real-world pool and spa repairs. We stock OEM-grade replacement parts and help ensure you get the right component the first time.

With knowledgeable staff at our Fresno location, we support both DIY pool owners and professional technicians.

## Details

- **Price:** 31.95 USD
- **Vendor:** US Seals
- **Type:** Pump Parts
- **Tags:** Ready for Links, SEO Added

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 31.95 USD | In stock |

## Images

- US Seal BC-108 Motor Start Capacitor 108–130 MFD 250V OEM pool equipment part from BPS

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> Source: [Benchmark Pool Supply](https://benchmarkpoolsupply.com/products/us-seal-rd-20-370-motor-run-capacitor)
> Updated: 2026-07-16