Imagine this: you turn on the faucet and nothing comes out. You check the breaker, but the pump motor hums and refuses to start. Chances are the well pump start capacitor has failed. This small, cylindrical component provides the extra torque needed to get your submersible motor spinning. Without it, even a brand new pump is useless. In this guide, we have reviewed ten of the most popular well pump start capacitors on Amazon, focusing on compatibility with Franklin control boxes and long term reliability. Whether you need a replacement for a 1/2 HP or 2 HP system, we have you covered.
Before diving into the specific products, it helps to understand how a start capacitor works. It temporarily stores electrical energy and releases it during startup to give the motor a boost. Over time, capacitors lose capacitance due to heat and age. When the measured value drops below the required range, the motor may struggle to start or draw excessive current. Replacing it with the correct microfarad (MFD) rating is critical. If you are unsure which pump size you need, our guide on what pump you need for your well can help you match horsepower to your water demand.
Pros
- High compatibility with multiple Franklin control box models
- Sturdy aluminum construction with better heat dissipation
- Non-polarized terminals simplify installation
- Direct replacement for Franklin part 275464118
- Strong average customer rating reflects reliable performance
Cons
- Not universal, confirm your control box model and original MFD rating before ordering
- Mounting hardware not included, some installations require nylon ties or existing bent pins
- Designed for starting duty only, not a replacement for the run capacitor
The KuangBBBTools 105-126 MFD motor start capacitor is a direct replacement for Franklin well pump control boxes rated at 1.0, 1.5, and 2.0 horsepower. It is designed for homeowners, well service technicians, and pump repair professionals who need dependable starting torque to get a stalled motor running again.
This capacitor covers the 105 to 126 microfarad range and works with 220 to 250 volt AC systems at 50/60 Hz. It matches the electrical requirements of common Franklin control boxes, and the non-polarized terminals make wiring simple and reduce the chance of connection errors.
The round aluminum body measures roughly 2.05 inches wide and 3.39 inches high, fitting easily in the original control box space. It replaces Franklin part 275464118 and is compatible with multiple control box models, including 2823018110, 2801084915, 2823018310, and 2823508110. Most installations use nylon ties or a bent steel pin to hold the capacitor in place.
Before ordering, confirm that your control box matches the listed models and that the capacitance range suits your motor's start winding. This is a start capacitor, not a run capacitor, so it is not meant for continuous duty. Some users may need to supply their own mounting hardware if the original clips are missing.
Overall, the KuangBBBTools motor start capacitor offers a strong combination of fit, durability, and easy installation for Franklin pump systems. The aluminum case and larger housing promote better heat dissipation, making it a smart replacement for restoring reliable well pump operation.
Model: KuangBBBTools 105-126 MFD Motor Start Capacitor
Capacitance: 105 to 126 microfarads (MFD)
Operating Voltage: 220 to 250 V AC, 50/60 Hz
Shape: Round
Material: Aluminum
Dimensions: 2.05 inches wide x 3.39 inches high
Upper Temperature Rating: 105 degrees Fahrenheit
Compatible Control Boxes: Franklin 2823018110, 2801084915, 2823018310, 2823508110 and similar models
Replaces Franklin Part: 275464118
Unit Count: 1 capacitor
Before buying a replacement start capacitor, check the capacitance rating printed on the original part. The replacement should match both the microfarad range and the AC voltage rating of the control box.
This KuangBBBTools capacitor is designed for Franklin 1.0, 1.5, and 2.0 HP control box models such as 2823018110, 2801084915, 2823018310, and 2823508110. If your control box is not listed, verify that the physical dimensions and electrical specs are compatible.
Keep in mind that a well pump control box normally contains one start capacitor and one run capacitor. The run capacitor is usually a CBB60 or CBB65 type, while the start capacitor provides extra torque only during motor startup. Replacing the right component is essential for reliable pump operation.
Pros
- Exact OEM specification replacement
- Made in USA by Barker Microfarads
- Fits multiple Franklin models
- Compact design fits standard control box
- High customer satisfaction rating
Cons
- No returns on electronic components
- Not a universal fit, verify your control box model
- Only the capacitor, not a full control box
This start capacitor is a consumable component engineered for Franklin 1HP, 1.5HP, and 2HP well pump control boxes. It is a direct replacement for Franklin part number 275464113 and also fits control box models 2823008110, 2823018110, 2801084915, 2823018310, and 2823508110. If your pump is slow to start, hums, or trips the breaker, a weak capacitor may be the culprit.
Made in the USA by Barker Microfarads (BMI), this capacitor offers a 105-126 MFD range at 220VAC and works on 50/60Hz systems. The capacitance range matches the original Franklin spec, ensuring proper starting torque and smooth motor operation. Built with a plastic case and an 85°C temperature rating, it handles typical well pump duty cycles effectively.
The capacitor measures 3.35 inches high by 2.15 inches in diameter with a snap-in mount that fits the same mounting clips as the factory original. The cylindrical design is compact and durable, and the markings clearly show MFD and voltage ratings. Replacing a weak start capacitor with this unit restores full performance without replacing the entire control box.
The main drawback is the no-return policy for electronic components, so double-check your control box model before ordering. Also, this is only the start capacitor, not a complete control box or run capacitor. For most Franklin-compatible systems, it is an exact fit, but if you have a non-listed brand, verify compatibility via your existing capacitor spec.
For owners of Franklin 1HP to 2HP well pump systems, this TuhorsePumps start capacitor is a reliable and cost-effective replacement. It delivers OEM-grade specs in a USA-made package, and the high user rating confirms its performance. Skip the service call and keep your water flowing by swapping in this capacitor at the first sign of starting trouble.
Pros
- Matches Franklin part #275464118 as a direct replacement.
- Well rated by customers at 4.6 out of 5 stars.
- Durable aluminum shell built for heat dissipation and impact resistance.
- Easy installation using existing control box mounting hardware.
- Versatile compatibility across multiple Franklin 1 to 2 HP control boxes.
Cons
- Broad 105-126 MFD tolerance may not suit motors requiring a very precise capacitance value.
- No mounting hardware is included, so you may need to reuse the original bracket or zip ties.
- Compatibility is not universal; verify your exact control box model before ordering.
The BlueNatHxRPR 105-126 MFD motor start capacitor is a drop-in replacement component designed for Franklin electric well pump control boxes rated at 1.0, 1.5, and 2 HP. It is a practical choice for homeowners, well pump technicians, and DIYers who need to get a water system running again without replacing the entire control box.
This round capacitor is engineered to deliver reliable starting torque to the pump motor, with a broad 105-126 MFD capacitance window and 250V AC rating. User feedback highlights solid performance and a high satisfaction score, making it a dependable repair solution for common Franklin control box failures.
The aluminum shell and classic round design help with heat dissipation and durability in a demanding environment. It measures 3.33 inches high by 2 inches in diameter, matching the original footprint, and can be secured with nylon ties or the existing steel mounting pin.
One limitation is that the capacitance range is not a single fixed value, so it may not be ideal for pumps that require a very precise uF rating. Also, no mounting hardware is included, and you will need to verify that your specific control box model is compatible before purchasing.
For most Franklin 1.0, 1.5, and 2 HP setups, this start capacitor offers excellent value, easy installation, and dependable performance. If you need a straightforward replacement for a failed well pump start capacitor, the BlueNatHxRPR is well worth considering.
Product Name: Well Pump Start Capacitor
Capacitance: 105-126 MFD
Voltage Rating: 250V AC 50/60 Hz
Shape: Round
Dimensions: 3.33 inches height x 2.0 inches diameter
Net Weight: 4.2 oz
Material: Aluminum shell
Compatible Replacements: Franklin Part #275464118
Compatible Control Boxes: 2823008110, 2823018110, 2801084915, 2823018310, 2823508110
Pros
- Perfect fit for common Franklin and CRC control boxes
- Durable aluminum construction with better heat management
- Affordable price compared to OEM replacements
- Easy installation with simple mounting options
- Reliable performance based on user reviews
Cons
- Slightly longer than some original capacitors, may require minor adjustment during install
- Only suitable for 1/2 to 3/4 HP motors, not for larger pumps
- Some users recommend replacing the relay simultaneously for best results
The BlueNatHxRPR 59-71 MFD motor start capacitor is a specialized replacement component designed for Franklin 1/2HP and 3/4HP well pump control boxes, including models 2801054915 and CRC 2824075015. It is also compatible with many other similar water pump systems, making it a versatile choice for homeowners and technicians alike.
This capacitor stands out for its robust aluminum shell, which offers better heat dissipation and stability compared to the plastic CBB60 capacitors often found in these boxes. Users report that it restores pump starting power effectively, with many noting that it works perfectly after installation and continues to perform reliably over months of use.
Installation is straightforward: the round capacitor fits into the control box and can be secured with nylon ties or a bent steel pin. Some users noted that it is slightly longer than the original, but this does not affect fitment or function. The capacitor is rated at 250V AC and 50/60 Hz, matching standard household electrical systems.
A minor consideration is that this capacitor is specifically designed for 1/2 to 3/4 HP motors, so it will not work for larger pumps. Additionally, some experienced users recommend replacing the start relay at the same time for optimal performance. A few reviews also mention the need to check for other issues, such as a stuck floater, which can mimic capacitor failure.
Overall, the BlueNatHxRPR start capacitor is a cost-effective and dependable solution for restoring your well pump to working order. With a high customer rating and numerous testimonials confirming its ease of use and durability, it is a solid choice for DIY repairs on Franklin and similar control boxes.
Pros
- Excellent value and quality with high customer satisfaction (4.6 stars)
- Easy to install with no wiring changes required
- Long lifespan up to 30,000 hours reduces replacement frequency
- UL and international certifications ensure safety and reliability
- Wide application covers pool pumps, well pumps, and AC motors
Cons
- Capacitance tolerance of ±20% may not suit precision applications
- Single capacitor pack; multi-pack not available for bulk replacements
- Requires proper discharge before handling to avoid electrical shock
The BlueStars 161-193 uF MFD 125 VAC Motor Start Capacitor is a robust replacement component designed for single-phase AC motors commonly found in pool pumps, well pumps, air conditioners, and compressors. It is UL and CUL listed, meeting stringent US and Australian safety standards, which gives users confidence in its reliability and performance.
With a capacitance range of 161-193 microfarads and a voltage rating of 125 VAC, this capacitor is a direct fit for many residential and light commercial motors. Customer reviews highlight its easy swap installation, often taking just 15 minutes and saving hundreds of dollars in service calls. The product boasts a 4.6-star average rating from nearly 200 reviews, with many users praising its quality and perfect fit.
Built to last, the capacitor offers an operational life of up to 30,000 hours and can withstand temperatures from -40°F to +149°F. Its round shape and top-mounted terminals make it simple to replace without modifying existing wiring. The included lifetime protection ensures that any defects or issues are covered for the life of the product.
One potential drawback is the capacitance tolerance of ±20%, which may be too wide for some precision applications. Additionally, the capacitor is sold as a single unit, so those needing multiple replacements will have to buy separately. As with any electrical component, proper safety precautions (discharging the old capacitor) are essential to avoid shock.
Overall, the BlueStars 161-193 uF Motor Start Capacitor is an excellent choice for DIYers and professionals alike who need a reliable, safe, and cost-effective solution for a non-starting motor. Its high ratings, long lifespan, and certifications make it a top contender in its category.
Capacitance: 161-193 uF MFD
Rated Voltage: 125 VAC
Tolerance: ±20%
Shape: Round
Terminal Size: 2.8 x 1.45 inches
Operating Temperature: -40°F to +149°F
Lifetime: Up to 30,000 hours
Certifications: UL, CUL, CEL, TUV SUD
Application: 50/60 Hz AC motors
Included: 1 Capacitor
Pros
- High-quality USA-made capacitor with consistent capacitance values.
- Exact fit for popular Franklin and CRC well pump control boxes.
- Durable copper construction withstands heat and vibration.
- Trusted by hundreds of users with overwhelmingly positive feedback.
- Competitive price for a premium replacement component.
Cons
- No returns accepted for electronic components, so verify compatibility before purchase.
- Limited to 1/2 and 3/4 HP pump motors; not suitable for larger or smaller systems.
- Capacitance tolerance (59-71 MFD) may require confirmation for precise applications.
The TuhorsePumps 59-71 MFD start capacitor is a straightforward replacement part designed for Franklin 1/2 and 3/4 HP well pump control boxes. If your pump motor hums but fails to start, a weak capacitor is often the culprit. This unit, manufactured by Barker Microfarads in the USA, restores reliable starting power and extends the life of your pump system.
Standout features include its precise 59-71 microfarad range and 220VAC rating, which match the original Franklin specifications exactly. The copper construction and 105°C temperature rating ensure it can handle the heat and electrical stress common in well pump environments. Users consistently report that it fits perfectly and solves starting issues on the first try.
Real-world performance is excellent: with a 4.6-star average from over 250 reviews, most customers note immediate improvement in motor startup. The capacitor is compact (2.15 inches wide, 3.35 inches tall) and fits into standard control boxes without any modifications. Installation is simple for anyone comfortable with basic electrical work.
One honest drawback is the no-return policy on electronic components, so double-check your control box model (Franklin 2801054915 or CRC 2824075015) before ordering. Also, the capacitance tolerance (59-71 MFD) means it may not be ideal for motors that require a very specific capacitance value outside that range.
Overall, this is a reliable, well-made replacement capacitor that delivers exactly what it promises. For homeowners and technicians maintaining Franklin-based well pumps, it is a cost-effective and trusted solution backed by strong customer satisfaction.
Capacitance: 71 microfarad (range 59-71 MFD)
Voltage: 220VAC, 50/60Hz
Dimensions: 2.15" diameter x 3.35" height
Temperature Rating: 105°C
Material: Copper
Shape: Cylinder
Compatible With: Franklin 275464105, 2801054915, CRC 2824075015
Manufacturer: Barker Microfarads (BMI)
UPC: 030955064147
Pros
- Precision capacitance range ensures reliable motor starts.
- Durable metal and plastic construction withstands typical pump house conditions.
- Snap-in mount for easy installation without special tools.
- Trusted brand with a strong 4.6-star customer rating from verified buyers.
Cons
- No returns accepted for electronic components, so verify compatibility before purchase.
- Capacitor is a consumable part that will need periodic replacement over time.
- Only compatible with specific control box models; check your part number (e.g., 275464118) to ensure fit.
This start capacitor is designed for Franklin 3/4HP and 1HP well pump control boxes, making it an ideal replacement for homeowners experiencing pump start issues. It is also compatible with CRC and Tuhorse models, offering broad applicability for residential well systems.
Standout features include its USA manufacturing by Barker Microfarads (BMI), which ensures high quality and long life. The capacitance range of 86-103 MFD is precisely matched to the original Franklin specifications, delivering dependable start torque every time.
The capacitor has a compact cylinder shape measuring 2.15 inches wide and 3.35 inches tall, with a snap-in mounting design that simplifies installation. Its metal and plastic construction provides durability in typical pump house environments.
A potential drawback is that no returns are accepted for electronic components, so confirming your control box model and part number is essential. As a consumable part, it will eventually need replacement, but this is standard for start capacitors.
Overall, this is a highly rated, reliable replacement capacitor that earns strong reviews from users. For a straightforward DIY fix on common Franklin or compatible pumps, it is a smart choice.
Capacitance: 86 microfarad (range 86-103 MFD)
Operating Voltage: 220 volts
Maximum Voltage: 220 volts
Frequency: 50/60 Hz
Shape: Cylinder
Dimensions: 2.15" W x 3.35" H
Material: Metal, Plastic
Mounting Type: Snap-In Mount
Manufacturer: Barker Microfarads Inc.
Compatible Part Numbers: Franklin 275464118, 2801074915, CRC 2824085015, Tuhorse TCB15M230
Pros
- Exact fit for popular Franklin and CRC control boxes, eliminating guesswork.
- Excellent heat dissipation due to larger body, promoting longevity.
- Easy to install with basic tools and included mounting method.
- Highly rated by customers for being the correct part and working immediately.
- Cost-effective solution for well pump capacitor failures.
Cons
- One user reported capacitor failure within 24 hours, suggesting possible quality control variance.
- Does not include a depletion resistor across the terminals, which some older designs may require.
- Plastic housing may not dissipate heat as effectively as an aluminum shell, though the larger size compensates.
The KuangBBBTools 86-103 MFD Motor Start Capacitor is a direct replacement part designed for Franklin and CRC well pump control boxes, specifically for 3/4 and 1 HP pumps. This capacitor is ideal for homeowners or technicians looking to restore a non-starting well pump without replacing the entire control box.
Its standout feature is compatibility: it fits Franklin Control Box 2801074915, CRC 2824085015, and similar models, directly replacing Franklin part #275464118. The larger body housing improves heat dissipation, which is critical for capacitor longevity in enclosed control boxes. Customers report easy installation using nylon ties or a steel pin, and many confirm it works immediately.
Build quality is typical for a plastic start capacitor: round shape, snap-in mount, and rated for 250V AC. The manufacturer emphasizes a more durable design with better heat management. However, the plastic shell is not as thermally conductive as aluminum, though users note the larger size helps.
Potential drawbacks include a small risk of early failure, as one review noted the capacitor smoked and failed within 24 hours. Additionally, the capacitor lacks the depletion resistor sometimes found on original parts, which could affect compatibility with certain control circuits. Most users found it a perfect fit, but those with older systems should verify requirements.
Overall, this capacitor offers excellent value for a targeted fix. It is a reliable choice for common well pump applications, provided you purchase from a trusted seller and monitor for any initial issues. For the price, it is a smart spare to keep on hand.
Pros
- Reliable start capacitor that restores water quickly.
- Direct replacement for common well pump control box capacitors.
- Robust aluminum construction for better heat dissipation.
- Very affordable compared to replacing the entire control box.
- Positive customer feedback with many reporting perfect fit.
Cons
- Next-day delivery may not be available for all locations.
- Only provides start capacitor function; does not include run capacitor.
- Limited to 86-103 MFD range, so must verify exact requirement.
This BlueNatHxRPR start capacitor is designed as a drop-in replacement for well pump control boxes, particularly Franklin Electric 3/4 HP and 1 HP models. It is ideal for homeowners or technicians looking to fix a failed pump without replacing the entire control unit.
With a capacitance rating of 86-103 MFD and a maximum voltage of 250V AC, it delivers the precise surge needed to start single-phase well pump motors. The aluminum CBB65 housing provides excellent heat dissipation, ensuring reliable operation even in demanding conditions.
The capacitor measures approximately 2 inches in diameter and 3.3 inches tall, fitting easily into standard control boxes. Its round shape and press-fit mounting simplify installation using nylon ties or bent steel pins, as noted in the product description.
A minor drawback is that delivery may not offer next-day options, which could be inconvenient during an emergency. Also, this is only a start capacitor; if your system also needs a run capacitor, you will need to purchase that separately. Ensure your specific capacitance requirement falls within 86-103 MFD before ordering.
Overall, the BlueNatHxRPR capacitor delivers reliable performance at a fraction of the cost of a new control box. With a strong customer rating and direct compatibility with popular Franklin models, it is a smart choice for restoring water supply quickly.
Pros
- Reliable performance as confirmed by positive customer reviews
- Affordable price compared to OEM capacitors
- Durable copper material withstands power surges
- Compact design fits standard control boxes
- Quick shipping and responsive customer support
Cons
- Some units may have internal movement causing a rattle when shaken
- Not an original Franklin part, which may concern brand-loyal users
- Smaller physical size than some original capacitors, though ratings match
The Poweka 105-126 uf motor start capacitor is designed as a replacement for Franklin well pump control boxes, compatible with 1HP, 1.5HP, and 2HP models. It is ideal for homeowners or technicians needing a cost-effective alternative to OEM parts.
With a capacitance range of 105-126 uF and voltage rating of 220-250VAC, this capacitor matches the specifications required by many Franklin control boxes. Customer reviews highlight its reliable performance and quick delivery, with many users reporting successful replacements.
The capacitor features a copper construction and a compact round shape that fits easily into standard control boxes. It is rated for temperatures from -40 to +65 degrees Celsius, ensuring durability in various environments.
Some users note that the capacitor is slightly smaller than the original, and a few have reported a slight internal rattle. As a non-OEM part, it may not carry the same brand assurance, but it is fully functional and backed by customer support.
Overall, the Poweka capacitor pack offers excellent value for money, providing two units for a reasonable price. For those seeking a dependable replacement for Franklin well pump control boxes, this is a solid choice.
- Capacitance: 105-126 uF (MFD)
- Voltage: 220-250VAC
- Frequency: 50/60 Hz
- Temperature Range: -40 to +65 degrees Celsius
- Material: Copper
- Shape: Round
- Dimensions: 3.35 inches height x 1.44 inches diameter
- Pack Size: 2 capacitors
- Compatible with Franklin part numbers 2823008110, 2823018110, 2801084915, 2823018310, 2823508110
Buying Guide: How to Choose the Right Well Pump Start Capacitor
Not all start capacitors are created equal. Choosing the wrong one can damage your motor or cause repeated failures. Focus on these four factors to get a long lasting replacement.
Capacitance Range and Voltage Rating
The microfarad (MFD) rating must match your motor’s requirements. Common ranges include 59-71 MFD for 1/2 and 3/4 HP motors, 86-103 MFD for 3/4 and 1 HP, and 105-126 MFD for 1, 1.5, and 2 HP. Using a capacitor with too low a rating can prevent startup; too high may overheat the windings. Also check the voltage rating. Most well pump start capacitors are rated at 220-250 VAC, but some low voltage models like the BlueStars 161-193 uF unit operate at 125 VAC for specific applications.
Compatibility with Your Control Box
Franklin control boxes are the most common in residential well systems. Look for capacitors explicitly listed for Franklin part numbers such as 275464113, 275464118, or 275464105. Many aftermarket capacitors also fit CRC and Tuhorse boxes. For instance, the TuhorsePumps 105-126 MFD capacitor is a direct replacement for Franklin 2823008110 and similar models. Always verify your control box model before purchasing. If you are considering a quiet pump upgrade, check out our recommendations for quiet well pumps that work with these capacitors.
Build Quality and Heat Dissipation
Capacitors with larger housings dissipate heat more effectively, which extends service life. Models like the BlueNatHxRPR 105-126 MFD capacitor feature a 3.33-inch tall body compared to smaller 36mm units. The Poweka 105-126 uF pack of two also offers a compact size but may run warmer. Look for UL or ETL certification if you want added safety assurance. The BlueStars capacitor is UL listed and has been verified to meet strict North American standards.
Pack Size and Value
Some capacitors are sold individually, while others come in packs of two. Buying a pack can be cost effective if you have multiple pumps or want a spare. The Poweka 2-pack is a popular choice for budget minded buyers. However, single capacitors from TuhorsePumps or KuangBBBTools are often sufficient for a one time replacement. Consider your long term needs and storage space.
If you are installing a new well system from scratch, you may also want to review our guide on well pump kits with pressure tanks to ensure all components are compatible.
Final Thoughts
After evaluating capacitance accuracy, build quality, and user feedback, we recommend the 105-126 MFD (uF) 1.0 1.5 and 2 HP Well Pump from TuhorsePumps for its robust BMI construction and precise Franklin compatibility, and the 105-126 MFD (uF) Motor Start Capacitor Compatible from BlueNatHxRPR as a budget friendly alternative with a larger housing for better heat management. Both have been confirmed by hundreds of users to restore pump startup reliably. Choose the TuhorsePumps if you want a US made capacitor with a proven track record, or the BlueNatHxRPR if you prefer a slightly lower price without sacrificing quality.
Frequently Asked Questions
How do I know if my well pump start capacitor is bad?
Common signs include a humming motor that won’t start, a tripped breaker, or a visibly bulging or leaking capacitor. You can also measure capacitance with a multimeter. If the reading is below the rated range (e.g., 80 MFD on a 105-126 MFD capacitor), it is time to replace it.
Can I use a higher MFD capacitor for a stronger start?
No. Using a capacitor with a higher microfarad rating than specified can overheat the motor windings and shorten the pump’s life. Always match the exact range listed on the control box or motor nameplate. For example, a 1 HP Franklin pump requires 86-103 MFD, not 105-126.
How often should I replace a well pump start capacitor?
Capacitors typically last 5 to 10 years depending on run cycles and ambient temperature. If your pump starts frequently or the control box is in a hot location, consider checking it every 3-4 years. Replacing it proactively can prevent unexpected breakdowns. For more tips on maintaining your system, see our complete well pump kit for home guide.
Are all well pump start capacitors the same size?
No. Physical dimensions vary. The most common size for Franklin compatible capacitors is about 2 inches in diameter and 3.3 inches tall. Some compact models are only 1.44 inches by 3.35 inches. Always verify that the new capacitor fits inside your control box before purchasing.
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