US Seal RD-25-370 Motor Run Capacitor – 25 MFD, 370VAC
Keep Your Pool Pump Running Strong with a Reliable Run Capacitor
When your pool pump motor isn’t performing as it should, the problem may not be the motor itself—it could be the capacitor. The US Seal RD-25-370 Motor Run Capacitor – 25 MFD, 370VAC is designed to deliver consistent, efficient electrical support for motors used in pool pumps, spa blowers, and other water system equipment. By providing steady current, this run capacitor ensures that your motor runs smoothly, efficiently, and reliably.
US Seal is trusted across the pool industry for producing durable, OEM-grade replacement parts. This capacitor is built to withstand the heat, moisture, and vibration common in pool environments, making it the smart choice for both professionals and homeowners looking to restore or maintain peak pump performance.
Why Your Motor Needs a Run Capacitor
A run capacitor is different from a start capacitor. While start capacitors help motors get going, run capacitors supply continuous electrical support to keep the motor running efficiently. When a run capacitor begins to fail, it can cause:
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Motors that overheat or shut down prematurely
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Pumps that run weakly or inconsistently
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Reduced circulation efficiency, leading to cloudy or unbalanced water
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Increased energy costs
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Shortened motor lifespan
Replacing a failing run capacitor with the RD-25-370 is a simple and affordable way to protect your pump and avoid costly motor replacements.
Key Features & Benefits
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Electrical Rating – 25 MFD (microfarads), 370VAC
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Reliable Performance – Supplies continuous support to keep motors efficient
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Durable Build – OEM-grade construction resists heat, moisture, and vibration
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Moisture-Sealed Housing – Designed for humid, outdoor pool environments
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Universal Compatibility – Works with many popular pool and spa motor brands
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Compact Design – Cylindrical shape fits standard pump housings
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Cost-Effective Solution – Prevents premature motor replacement
Common Applications
The RD-25-370 is compatible with a wide range of systems, including:
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Pool Pumps – Keeps circulation strong and reliable
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Spa Motors – Ensures consistent jet pressure
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Blowers & Boosters – Provides stable electrical flow for optimal performance
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Compatible with major motor brands including AO Smith, Century, Emerson, Franklin Electric, and more
⚠️ Always check your motor’s capacitor label before ordering. The microfarad (MFD) rating must match exactly, while voltage can be equal or higher.
Installation Guide
Installing the US Seal RD-25-370 is straightforward for experienced pool owners and technicians.
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Turn Off Power – Always shut off power at the breaker before servicing.
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Access Motor Housing – Remove the pump’s back cover to reach the capacitor.
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Discharge Old Capacitor – Safely discharge any stored energy using an insulated tool.
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Disconnect Wiring – Note wire placement before removing the old capacitor.
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Install New Capacitor – Connect wires securely to the new RD-25-370.
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Reassemble & Test – Replace the cover, restore power, and confirm proper operation.
⚠️ If unsure, consult a pool service professional for safe installation.
Long-Term Value
At just $32.95, the US Seal RD-25-370 is a low-cost investment compared to the price of replacing a burned-out pool motor, which can run hundreds of dollars. Benefits include:
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Extended motor lifespan
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Reduced energy consumption
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Fewer unexpected breakdowns
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Consistent pool water circulation
By choosing US Seal, you’re investing in long-lasting performance and peace of mind.
Product Specifications
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Manufacturer: US Seal
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Model: RD-25-370
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Type: Motor Run Capacitor
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Rating: 25 MFD, 370VAC
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Applications: Pool pumps, spa motors, blowers
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Housing: Moisture-resistant, cylindrical design
Why Choose Benchmark Pool Supply?
At Benchmark Pool Supply, we stock only trusted brands and genuine replacement parts. Our team specializes in pool equipment, ensuring that you receive the right part quickly and affordably. When you shop with us, you’ll get:
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Genuine US Seal replacement capacitors
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Fast shipping across the U.S.
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Expert guidance on compatibility
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Competitive pricing and reliable parts
We’re committed to helping pool and spa owners minimize downtime and keep their systems running smoothly all season long.
FAQs About the US Seal RD-25-370
Q: Can I use this capacitor in place of a 440VAC model?
A: You can use a higher voltage capacitor (e.g., 440VAC) in place of 370VAC, but the microfarad rating must always match.
Q: How do I know if my run capacitor has failed?
A: Symptoms include weak pump operation, overheating motors, buzzing noises, or a visibly swollen/leaking capacitor.
Q: How often should capacitors be replaced?
A: On average, run capacitors last 5–7 years, depending on operating conditions.
Q: Is this part compatible with saltwater pools?
A: Yes, it’s designed for durability in all pool environments, including saltwater systems.
Q: What’s the difference between a start and run capacitor?
A: Start capacitors provide extra power to start the motor, while run capacitors continuously regulate power during operation.
