US Seal RD-20-370 Motor Run Capacitor – 20 MFD, 370VAC
Keep Your Pool Pump Running Smoothly with a Reliable Run Capacitor
When your pump motor won’t stay running or struggles with efficiency, the issue may not be the motor itself—it could be the run capacitor. The US Seal RD-20-370 Motor Run Capacitor – 20 MFD, 370VAC provides consistent power regulation, ensuring that pool pumps, spa motors, and blowers run smoothly, quietly, and efficiently.
As part of US Seal’s professional-grade replacement line, this run capacitor is designed to meet or exceed OEM specifications, giving homeowners and technicians an affordable, durable solution for motor performance issues.
Why Replace a Motor Run Capacitor?
Unlike a start capacitor (which helps motors start), a run capacitor provides continuous support to keep the motor running efficiently. Over time, heat, vibration, and electrical stress cause capacitors to weaken, leading to:
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Motors that hum but run weakly
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Reduced pump efficiency and higher energy bills
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Overheating motors that shut down prematurely
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Frequent circuit breaker trips
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Shortened motor lifespan
Replacing your run capacitor early helps protect your motor, reduces operating costs, and ensures uninterrupted pool circulation.
Features and Benefits of the US Seal RD-20-370
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Electrical Rating – 20 MFD (microfarads), 370VAC
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OEM-Grade Quality – Meets or exceeds original equipment standards
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Durable Design – Built to withstand heat, moisture, and vibration in pool environments
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Extended Motor Life – Reduces strain by ensuring efficient motor operation
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Moisture-Sealed Housing – Protects against humidity and water intrusion
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Compact, Standard Size – Cylindrical design fits most pool and spa motors
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Versatile Use – Compatible with a wide range of pumps, blowers, and spa motors
Compatible Applications
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Commonly used with AO Smith, Century, Emerson, Franklin Electric, and other pool motor brands
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Ideal for residential and commercial pool pumps
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Also works with spa motors and blowers requiring a 20 MFD, 370VAC run capacitor
⚠️ Always check the capacitor label on your existing motor before ordering. Voltage and microfarad ratings must match for safe operation.
Installation Guide
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Turn Off Power – Shut off power at the breaker before servicing.
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Access Motor Housing – Remove end cover to expose capacitor.
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Discharge Old Capacitor – Use an insulated screwdriver to discharge stored energy.
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Remove Old Capacitor – Disconnect wires and note placement.
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Install New RD-20-370 – Connect wires to corresponding terminals.
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Reassemble & Test – Close housing, restore power, and verify smooth motor operation.
⚠️ If unsure, contact a qualified pool technician to avoid electrical hazards.
Long-Term Value
At just $31.95, the US Seal RD-20-370 protects your pump motor investment, which can cost hundreds of dollars to replace. By providing steady, efficient power, this capacitor:
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Extends motor life
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Reduces costly energy waste
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Prevents unexpected downtime
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Keeps your pool or spa circulation system working at peak performance
Product Specs
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Manufacturer: US Seal
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Model: RD-20-370
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Type: Motor Run Capacitor
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Rating: 20 MFD, 370VAC
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Application: Pool pumps, spa motors, blowers
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Construction: OEM-grade, moisture-resistant
Why Buy From Benchmark Pool Supply?
At Benchmark Pool Supply, we understand how critical small electrical components are to the overall health of your pool system. We stock only genuine, trusted brands like US Seal, known for reliable aftermarket replacement parts.
When you buy with us, you’ll get:
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Fresh, genuine US Seal capacitors
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Expert help with product compatibility
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Fast shipping so your pool downtime is minimal
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Affordable, professional-grade parts trusted by technicians nationwide
FAQs About the US Seal RD-20-370 Run Capacitor
Q: What’s the difference between a start and run capacitor?
A: A start capacitor helps motors start. A run capacitor (like the RD-20-370) provides continuous current while the motor is running.
Q: Can I use a 440VAC capacitor instead of 370VAC?
A: Yes, it’s safe to use a higher voltage rating, but the microfarad (MFD) value must always match your motor’s requirements.
Q: How do I know if my run capacitor is failing?
A: Signs include motors overheating, weak performance, frequent breaker trips, or a capacitor that looks swollen or leaking.
Q: How long does a run capacitor last?
A: Typically 5–7 years, depending on heat, humidity, and usage conditions.
Q: Is this part compatible with saltwater pool pumps?
A: Yes, it’s designed for use in all pool and spa environments, including saltwater systems.
