US Seals Run Capacitor RD-50-370 – 50 MFD, 370VAC | Pool & Spa Motor Replacement
Restore Power and Efficiency to Your Pump Motor
When your pool or spa motor starts to hum, overheat, or lose power, the culprit is often a failing capacitor. The US Seals Run Capacitor RD-50-370 – 50 MFD, 370VAC is a direct replacement part engineered to restore consistent, efficient motor operation. Built with OEM-grade materials and sealed for moisture resistance, this capacitor is designed to thrive in poolside environments where heat and humidity can quickly wear out inferior components.
US Seals has built its reputation on producing durable, reliable replacement parts that pool professionals trust. Whether you’re maintaining a residential pool, a spa, or commercial equipment, this run capacitor helps ensure your system runs safely and efficiently.
Why a Run Capacitor is Essential
Your motor relies on a run capacitor to regulate electrical current while in operation. Unlike a start capacitor, which only assists during motor startup, a run capacitor works continuously.
When a run capacitor weakens or fails, it can lead to:
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Sluggish pump performance – weak suction or low water flow
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Overheated motors – premature shutdown or damage
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Higher energy bills – inefficient operation consumes more power
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Shorter equipment life – increased stress on the motor windings
Replacing a failing capacitor with the RD-50-370 ensures your motor runs smoothly, extending its life and saving you from costly repairs.
Key Features & Benefits
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Electrical Rating: 50 MFD, 370VAC
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Continuous Support: Regulates motor current for efficient performance
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OEM-Grade Quality: Compatible with leading motor brands (Century, AO Smith, Emerson, Franklin Electric, and more)
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Moisture-Sealed Housing: Built for poolside conditions with high humidity and heat
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Corrosion-Resistant: Designed for long-lasting reliability in outdoor settings
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Cost-Effective Replacement: Prevents premature motor failure and expensive pump replacements
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Universal Fit: Standard cylindrical size for easy installation
Common Applications
The RD-50-370 is widely used in:
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Pool Pumps – Maintains circulation strength and water clarity
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Spa Motors – Delivers steady power for jets and blowers
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Boosters and Blowers – Keeps auxiliary equipment running efficiently
⚠️ Important: Always match the microfarad (MFD) rating exactly. Voltage can be the same or higher, but never lower.
Installation Made Simple
Installing the US Seals RD-50-370 is quick and straightforward for experienced pool owners and technicians:
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Shut Off Power – Disconnect at the breaker before starting.
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Relieve Pressure & Access Housing – Open the motor’s back cover.
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Discharge Old Capacitor – Use an insulated tool to release stored charge.
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Document Wiring Setup – Take a photo for reference.
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Replace with RD-50-370 – Connect wires securely to the new capacitor.
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Reassemble & Test – Restore power and verify smooth motor operation.
⚠️ If you’re unsure or not comfortable with electrical work, hire a qualified pool technician.
Long-Term Value
At just $54.95, the RD-50-370 is a small investment compared to replacing an entire pool pump motor. Benefits include:
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Extended motor lifespan
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Lower operating costs through improved efficiency
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Consistent pool water circulation
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Peace of mind knowing your motor is protected
Product Specifications
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Manufacturer: US Seals
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Model: RD-50-370
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Type: Motor Run Capacitor
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Rating: 50 MFD, 370VAC
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Shape: Cylindrical, sealed housing
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Applications: Pool pumps, spa motors, blowers
Why Buy from Benchmark Pool Supply?
At Benchmark Pool Supply, we specialize in carrying OEM-grade replacement parts for pool owners and service professionals. When you order from us, you’ll get:
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Genuine US Seals capacitors
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Expert guidance on part compatibility
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Competitive pricing and fast shipping
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Trusted support from a pool supply specialist
We make it easy to get the right replacement parts so your pool equipment stays reliable season after season.
FAQs About the RD-50-370 Run Capacitor
Q: Can I use a higher voltage capacitor instead?
A: Yes. A 440VAC capacitor can safely replace a 370VAC unit, but the MFD rating must always match exactly.
Q: How do I know my run capacitor is failing?
A: Look for weak pump performance, motor humming, overheating, or a visibly swollen/leaking capacitor.
Q: How long should this capacitor last?
A: On average, run capacitors last 5–7 years, depending on usage and environment.
Q: Is this compatible with saltwater pools?
A: Yes. Its sealed, corrosion-resistant design is suitable for both freshwater and saltwater systems.
Q: Can I install this part myself?
A: Yes, if you’re comfortable with basic electrical work. Otherwise, a licensed pool technician can install it quickly.
