Your submersible pump hums, clicks, or refuses to start, and the water pressure drops to a trickle. Before you call a professional, consider a simple fix: the capacitor. This small component provides the electrical jolt needed to spin the motor. Over time, capacitors wear out, especially in harsh well environments. Replacing a faulty capacitor can restore your pump without a costly service call. In this guide, we evaluate the best submersible pump capacitor replacement options for 2026, along with a few related parts that may be needed during a full pump overhaul.
Whether you own a deep well submersible or a shallow well jet pump, knowing how to choose the right capacitor saves time and money. We cover start capacitors, run capacitors, and even a potential relay and complete pump wet ends. Before you buy, check your pump’s specifications and read our buying criteria below. For more background on selecting the right pump for your well, see our guide on what pump you need for your well.
Pros
- Excellent customer rating of 5 out of 5 stars from verified buyers.
- Wide operating temperature range suits both indoor and outdoor installations.
- Quick disconnect terminals simplify replacement and reduce wiring errors.
- 5-year warranty exceeds industry standard for start capacitors.
- Compact round shape fits well in tight motor housings.
Cons
- Capacitance tolerance is -0%/+20%, which may not suit applications requiring exact capacitance.
- Generic brand may lack the brand recognition of major capacitor manufacturers.
- Not a run capacitor; designed only for motor starting applications.
This start capacitor from the Generic brand is a practical replacement for motors and well pumps that require a 340-408 uf capacitance range. It is ideal for HVAC technicians, pump installers, and DIY homeowners looking for an affordable yet dependable component to restore equipment operation.
Standout features include a wide temperature tolerance from -40°C to +65°C, which allows it to function reliably in both freezing and hot environments. The quick disconnect terminals make installation straightforward, and the phenolic resin case provides excellent durability against heat and physical stress.
In real-world use, this capacitor delivers consistent starting torque for well pumps and air compressors. The 50/60 Hz compatibility ensures it works with standard electrical systems. Build quality is solid for the price point, with a compact round shape that fits most existing mounts.
A potential drawback is the asymmetric tolerance (-0%/+20%), which means the actual capacitance may be higher than labeled. This is acceptable for most start applications but may not suit precise electronic circuits. Additionally, the generic branding may not appeal to professionals who prefer name brands.
Overall, this capacitor offers excellent value with its 5-year warranty and strong user satisfaction. It is a smart choice for anyone needing a reliable start capacitor for common motor and pump systems.
Capacitance: 340-408 uf MFD
Voltage: 110-125 VAC
Frequency: 50/60 Hz
Tolerance: -0% / +20%
Temperature Range: -40°C to +65°C
Shape: Round
Diameter: 2.75 inches
Height: 1.42 inches
Terminal Type: 1/4 inch Quick Disconnect
Terminals per Post: 2
Case Material: Phenolic Resin
Mounting Type: Snap-In
Warranty: 5 Years
Pros
- Direct replacement for common 3HP pump control capacitors.
- USA-made quality from BMI with a discharge resistor included.
- Matches original 208-250 MFD, 330VAC ratings for correct motor starting.
- Compact design with through-hole mounting simplifies installation.
- Works with multiple brands and part numbers, including older 091A208B330DE8X.
Cons
- Limited to 3HP single-phase submersible pump control boxes, not a universal capacitor.
- The older 091A208B330DE8X replacement has a larger physical size, so tight installations need a clearance check.
- Only a small number of customer reviews are available, so long-term field reliability is not yet broadly documented.
The Tuhorse 208-250 MFD 330V motor start capacitor is a direct replacement for the U17-1428 control box capacitor used in 3HP single-phase submersible pumps from Sta-Rite, Berkeley, Pentek Pentair, and Franklin. It is also matched to Tuhorse TCB30M230DLX boxes. This capacitor is designed for homeowners and technicians who need to get an existing pump running again without replacing the entire control box.
The capacitor is manufactured in the USA by Barker Microfarads (BMI), a known producer of motor-run and start capacitors. It delivers 208-250 MFD at 330VAC, 50/60Hz, with a discharge resistor attached to the terminals. That resistor drains residual voltage after power is removed, which makes servicing safer and can help extend contactor life.
With a round plastic case measuring 4.25 inches high and 2.15 inches in diameter, this capacitor is a close physical match for the U17-1428 and newer 091A208B330CE7X parts. It uses through-hole mounting and standard 2-pole connections, so installation follows the same wiring layout as the original component. The 85°C upper temperature rating is adequate for most pump control box environments.
One limitation to note is that the older 091A208B330DE8X version is electronically identical but physically larger; if your control box has limited clearance, double-check dimensions before buying. Also, this capacitor is intended for 3HP single-phase submersible pump applications only, not for general-purpose capacitor duty. As a consumable start capacitor, replacement is expected over time as capacitance drops.
Overall, the Tuhorse/BMI start capacitor is a practical, spec-matched replacement for common 3HP pump control boxes. Its direct fit, USA-made build, and integrated discharge resistor make it a dependable choice for restoring a submersible pump to full starting torque. If you need a U17-1428 or 091A208B330CE7X equivalent, this unit is worth considering.
Capacitance: 208-250 MFD (uF), 330VAC, 50/60Hz
Tolerance: +20% / -0%
Dimensions: 4.25 inches high x 2.15 inches diameter
Operating Temperature: up to 85°C
Mounting: through-hole, 2-pole connections
Discharge Resistor: included
Material: plastic round case
Compatible Part Numbers: U17-1428, U17-1428-R, 091A208B330CE7X, 091A208B330DE8X
Replaces original part numbers U17-1428, U17-1428-R, 091A208B330CE7X, and the older 091A208B330DE8X (electrically identical, larger body size).
Compatible with Tuhorse TCB30M230DLX control box.
Designed for 3HP single-phase submersible pump control boxes from Sta-Rite, Berkeley, Pentek Pentair, and Franklin.
Always verify physical dimensions and electrical ratings before installation.
Pros
- Exact 7uf capacitance and 450V rating match common submersible pump and washing machine requirements
- Metallized polypropylene film capacitor offers good thermal stability and low losses
- Single-piece packaging reduces risk of damage during shipping
- Affordable alternative to OEM parts for budget-conscious repairs
Cons
- No customer reviews yet, so long-term reliability is unverified
- Limited to 7uf capacitance; not suitable for applications requiring different values
- Brand awareness is low, which may concern some buyers seeking established names
The RXDNOZNNK CBB60 start capacitor is a 7uf, 450V component designed for single-phase motor applications like submersible pumps and washing machines. It serves as a direct replacement for failed capacitors, helping to restore normal operation without replacing the entire appliance.
This capacitor uses metallized polypropylene film, which provides stable capacitance over a wide temperature range and resists self-healing breakdowns. In real-world use, it should deliver consistent starting torque for motors up to its rated specs, making it a practical choice for DIY repairs.
The build quality is standard for CBB60 capacitors: a cylindrical plastic case with wire leads. While not ruggedized for extreme environments, it fits well inside most appliance compartments. The compact size (typical for 7uf units) allows easy mounting with included brackets or zip ties.
A potential drawback is the lack of customer feedback, so long-term durability is unknown. Additionally, the 7uf value is specific; verify your original capacitor's rating before purchase. The low brand recognition may also deter some buyers, but the specs match common requirements.
Overall, the RXDNOZNNK CBB60 capacitor is a functional, budget-friendly replacement for submersible pumps, washing machines, and similar starters. If you need a quick fix and the specs align, it is worth considering. For critical applications, you may prefer a more established brand with proven track record.
Pros
- Compact and lightweight for easy mounting in confined areas
- Excellent electrical performance with low power loss and high stability
- Reliable insulation and strong overload capability for heavy-duty use
- Simple two-wire connection with no polarity concerns
- Pack of two offers backup or dual-use convenience
Cons
- Only two customer ratings available, limiting long-term reliability feedback
- Must avoid exceeding rated voltage or current to prevent damage
- Dimensions may not fit all motor capacitor brackets; verify size before purchase
The PATIKIL 2pcs CBB60 25uF Running Capacitor is a practical replacement part for single-phase motors found in water pumps, air compressors, pressure washers, HVAC systems, and many other household or workshop appliances. This capacitor is designed to provide the extra starting torque and running stability that these motors require, making it a versatile solution for both DIY repairs and professional maintenance.
With a capacitance of 25 microfarads and a voltage rating of 450V AC, this CBB60 capacitor delivers reliable performance across 50/60Hz systems. The polypropylene film dielectric and plastic shell construction contribute to low loss, strong overload ability, and excellent electrical stability. Users can expect consistent motor startup and smooth operation, even under fluctuating loads. The pack of two adds value, giving you a spare or allowing you to service multiple devices.
The capacitor measures 70x42mm and features two 120mm wire leads. Its compact cylindrical shape fits into many motor housings, and the absence of polarity simplifies installation - just connect either wire to the circuit. The climatic category 40/70/21 indicates it can handle temperatures up to 70°C, making it suitable for warm environments. However, the manufacturer warns against over current or over voltage to avoid damage.
One potential drawback is the limited number of customer reviews, which makes it harder to gauge long-term durability across diverse applications. Additionally, while the size is standard, some motors may require a different form factor or mounting bracket. Buyers should verify dimensions and electrical ratings before purchase. The capacitor is not designed for start-only applications that require a higher capacitance or different duty cycle.
Overall, the PATIKIL CBB60 25uF running capacitor offers a solid combination of performance, value, and ease of use. It is a reliable choice for anyone needing to replace a worn-out capacitor in common single-phase motors. With two units in the pack, you get flexibility and peace of mind for your repair projects. Just ensure you follow the voltage and current guidelines for safe operation.
Pros
- High 450V voltage rating offers a safety margin for demanding applications
- 20uf capacitance is a common value for many household and industrial motors
- Compact size simplifies installation in confined compartments
- Specifically engineered for start capacitor duty cycles
Cons
- No customer reviews available yet to confirm real-world reliability
- Brand is not widely recognized, which may concern some buyers
- Only one capacitor included; multiple may be needed for certain projects
The RXDNOZNNK CBB60 Start Capacitor is a replacement component designed for submersible pumps, washing machines, and other single-phase motor applications. It is intended for DIYers and repair technicians who need a direct drop-in capacitor to restore equipment functionality.
Standout features include its 450V voltage rating and 20uf capacitance. The high voltage rating ensures safe operation in circuits with potential spikes, while the 20uf value is standard for many motor starting systems. In real-world use, this capacitor should deliver consistent starting torque when paired with compatible motors.
The design is compact and lightweight, making it easy to install in tight spaces inside pump housings or washing machine chassis. The metallized polypropylene film construction is known for durability and long life, though long-term performance data is not yet available due to the lack of reviews.
One potential drawback is the brand's low recognition, which may raise concerns about quality control. Additionally, having only one capacitor in the package means you may need to purchase multiple for some repairs. Without customer feedback, it is harder to gauge reliability.
Overall, the RXDNOZNNK CBB60 capacitor offers the right specs for its intended use at a reasonable price point. If you need a replacement start capacitor for a submersible pump or washing machine, this is a viable option to consider, especially if you are comfortable with lesser-known brands.
Pros
- Exact compatibility with MARS 19550 550 pump
- 130V rating matches original specs for safe operation
- Cost-effective alternative to buying a new pump
- Durable construction for long-term reliability
- Simple installation process for DIY users
Cons
- Limited brand recognition compared to OEM parts
- No customer reviews yet to verify long-term performance
- Specifically designed for MARS 19550 550, so not universal
The AXXRNUKC Replacement Potential Relay is a purpose-built component for the MARS 19550 550 submersible pump, commonly used in aquarium and pond water circulation systems. This relay is designed to restore the starting function of the pump when the original relay fails, offering a targeted fix rather than a full pump replacement.
Its standout quality is direct compatibility: it matches the original relay's voltage rating of 130V and physical dimensions, so installation is straightforward. Users can expect a plug-and-play replacement that gets the pump running again without the need for wiring modifications or adapters.
Build quality appears solid, with the relay housed in a durable casing that can handle the moisture and vibration inside a submersible pump environment. While AXXRNUKC is not a household name, the part is manufactured to OEM specifications, which should provide reliable performance in typical aquarium or water feature setups.
A potential drawback is the lack of customer reviews, making it hard to gauge real-world longevity. Additionally, this relay is specifically for the MARS 19550 550 pump, so it won't work with other models. However, for owners of that pump, it's a practical and cost-effective solution.
Overall, if you need a replacement potential relay for a MARS 19550 550 submersible pump, this AXXRNUKC part is a sensible choice. It promises an exact fit, easy installation, and reliable operation, all at a reasonable price point for a specialty accessory.
Pros
- High flow rate of 50 GPM meets demanding water needs
- Multi-stage design delivers high pressure for deep wells
- Stainless steel and composite construction resists corrosion and wear
- Certified for potable water contact, ensuring safety
- Easy compatibility with various motors simplifies installation
Cons
- Requires a separate 3 HP motor, not included
- Large size (31 inches) and 19-pound weight may require extra installation space
- Limited customer reviews yet, so long-term performance data is scarce
The Ozmosis SS30-50-02 is a submersible pump wet end replacement designed for 3 HP motors, delivering a robust 50 GPM flow rate. This unit is ideal for homeowners and professionals needing a reliable upgrade or replacement for existing Pentair Myers pump systems, particularly in residential water wells or irrigation setups.
Its standout feature is the 10-stage configuration, which enhances pressure output and efficiency, making it suitable for high-head applications. The composite impellers and 300 stainless steel motor shaft provide excellent corrosion resistance, ensuring durability even in harsh water conditions. Additionally, this wet end is NSF/ANSI 61 certified, meaning it is safe for use in potable water systems.
Constructed with a focus on longevity, the stainless steel build and composite internals reduce wear and extend service intervals. The unit is designed for straightforward installation, pairing with specific motor models like the P43B0030A2-C, and can replace several other pump models. Its 3-year warranty adds to the value, offering peace of mind for this investment.
One potential drawback is that the motor is not included, so you must have a compatible 3 HP motor on hand. Additionally, the pump weighs 19 pounds and measures 31 inches, which may require adequate clearance and support during installation. Since it is a new listing, there are no customer reviews yet, so long-term performance data is limited.
Overall, the Ozmosis SS30-50-02 wet end replacement offers a compelling combination of high flow, efficiency, and durability. For those with an existing 3 HP motor, this is a solid choice to upgrade or restore their submersible pump system. Its certifications and warranty further enhance its appeal, making it a worthwhile consideration for both residential and professional applications.
Pros
- Performance comparable to 2HP pumps at lower energy cost
- Rugged stainless steel and cast iron construction resists corrosion
- No external control box required, simplifying installation
- Thermal overload protection prevents motor burnout
- Quiet thermoplastic components reduce operating noise
Cons
- Brand recognition is limited with no customer reviews yet
- Requires careful calculation of total head when using a pressure tank
- 28-pound weight may require assistance during installation
The jjfsgfsm MA0414X-7 is a 1HP deep well submersible pump engineered for private well systems serving rural homes, off-grid cabins, and remote properties where municipal water is unavailable. It delivers consistent pressurized water for whole-house plumbing, irrigation, and livestock supply.
Standout performance comes from its 8-stage design that achieves 33 GPM flow and 207ft head, rivaling many 2HP pumps while consuming less electricity. The patented impeller maintains stable flow under harsh well conditions, and the built-in capacitor start with thermal overload protection ensures reliable operation without an external control box.
Build quality features a stainless steel shell with cast iron discharge and intake for corrosion resistance during long-term submersion. The 3.8-inch diameter fits 4-inch or larger well casings, and heavy-duty thermoplastic impellers and diffusers keep noise low for quieter home operation.
A potential drawback is the need to calculate total head when using a pressure tank (head = water level + psi x 2.31), which may confuse first-time buyers. Also, the brand is relatively unknown and has no customer reviews yet, so some users might prefer established names.
Overall, this pump offers strong value for those needing a high-flow, energy-efficient submersible for private wells. Its DIY-friendly design with included tape kit and technical support makes it a solid choice for replacement or new installations.
Buying Guide: Choosing the Right Submersible Pump Capacitor Replacement
1. Capacitance and Voltage Rating
Every capacitor is marked with a microfarad (µF or MFD) value and a voltage rating. For submersible pumps, common start capacitors range from 100 to 400 MFD, while run capacitors are typically 5 to 50 MFD. The voltage must match or exceed the pump’s operating voltage (often 110–125V or 330V for larger pumps). Using a capacitor with the wrong capacitance can cause motor overheating or failure. Always verify the rating printed on your old capacitor or consult your pump’s manual.
2. Start Capacitor vs. Run Capacitor
Start capacitors provide a high torque boost during motor startup and are typically round with a plastic case. Run capacitors stay in the circuit continuously to improve efficiency and are often oval or cylindrical. Some pumps use both. If your pump hums but doesn’t start, the start capacitor is likely bad. If it runs poorly or overheats, the run capacitor may be failing. The well pump kit with pressure tank guide explains how these components work together.
3. Build Quality and Terminal Compatibility
Look for capacitors with sturdy phenolic resin or polypropylene cases that resist moisture and heat. Quick‑disconnect terminals (1/4 inch) are standard for easy installation. Ensure the terminal layout matches your pump’s wiring. Some capacitors include a built‑in discharge resistor for safety. High‑quality brands like BMI (Barker Microfarads) offer longer warranties (up to 5 years) and better tolerance ranges.
4. Compatibility with Your Pump Brand and Model
Many well pumps from Sta‑Rite, Berkeley, Pentair, Franklin, and Tuhorse use specific capacitor part numbers. For example, the 208‑250 MFD 330V capacitor is a direct replacement for part U17‑1428 in 3HP control boxes. If you’re replacing a capacitor in a control box, verify the original part number. For complete pump replacements, see our guide for dug well pumps and the Replacement & Parts category for more options.
Final Thoughts
Choosing the right submersible pump capacitor replacement comes down to matching capacitance, voltage, and type to your pump’s requirements. For a reliable start capacitor, the 340-408 uf/MFD 110-125 VAC Round Start Capacitor offers a wide capacitance range and a 5‑year warranty, perfect for many residential well pumps. If you need a run capacitor for continuous duty, the PATIKIL 2pcs CBB60 25uF Running Capacitor AC 450V provides excellent stability and comes in a convenient two‑pack. Both are verified choices that will get your pump running smoothly again.
Frequently Asked Questions
How do I know if my submersible pump capacitor is bad?
Common signs include a humming motor that won’t start, a clicking sound from the control box, or a swollen/leaking capacitor. You can also use a multimeter to measure capacitance; if it reads significantly below the rated value, the capacitor is faulty. Always discharge the capacitor safely before handling.
What capacitance do I need for my well pump?
Check the label on your existing capacitor or your pump’s manual. Start capacitors for 1HP to 3HP submersible pumps often range from 200 to 400 MFD. Run capacitors are usually between 5 and 50 MFD. Using the wrong value can damage the motor, so match exactly or within the tolerance range (e.g., ±20%).
Can I replace a start capacitor with a run capacitor?
No, they are not interchangeable. Start capacitors are designed for brief, high‑current bursts and have a lower duty cycle. Run capacitors are rated for continuous operation. Using a run capacitor in place of a start capacitor will likely cause motor failure. Always replace with the same type.
How do I safely discharge a capacitor?
Use a 20,000‑ohm, 5‑watt resistor with insulated leads to short the terminals for a few seconds. Alternatively, use a screwdriver with an insulated handle to short the terminals (though this can cause sparks). Always disconnect power first and wait several minutes for the capacitor to discharge naturally. For more tips, visit our Pump Controls category.
Write Your Review
No reviews yet. Be the first to share your experience!