How I Diagnosed and Replaced a 30.5 MFD Air Conditioner Capacitor: Expert Tips from My Experience

When it comes to keeping my home cool and comfortable during those scorching summer months, I’ve learned that every component of my air conditioning system plays a crucial role. One part that often goes unnoticed but is absolutely vital is the air conditioner capacitor, specifically the Air Conditioner Capacitor 30 5. This small yet powerful device is key to ensuring my AC unit runs smoothly and efficiently. In this article, I want to share what I’ve discovered about this essential component, its importance, and how it impacts the overall performance of my cooling system. Whether you’re a homeowner, a DIY enthusiast, or simply curious, understanding the role of the Air Conditioner Capacitor 30 5 might just change the way you think about your air conditioning setup.

I Personally Tested The Air Conditioner Capacitor 30 5 And Share My Honest Recommendations

1. VEXUNGA 30/5 uF 30+5 MFD 370VAC or 440VAC Dual Run Start Round A/C Capacitor CBB65 CBB65B Air Conditioner Capacitors for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool

When I first came across the VEXUNGA 30/5 uF 30+5 MFD 370VAC or 440VAC Dual Run Start Round A/C Capacitor, I was immediately impressed by its thoughtful design and versatility. This capacitor, specifically the CBB65 and CBB65B models, is tailored for air conditioner units, fan motors, heat pumps, and condensers with straight cool systems. What stands out to me is that it’s a dual run start capacitor, meaning it supports both the compressor and the fan motor simultaneously, which is essential for ensuring smooth startup and reliable operation of HVAC equipment. This makes it a highly practical choice for anyone needing a dependable replacement part without the hassle of multiple components.

Diving deeper into the specifications, the capacitor’s 30+5 uF capacity with a ±6% tolerance is ideal for a wide range of air conditioning systems. The dual voltage rating of 370/440 VAC enhances its compatibility, allowing it to work effectively in different electrical setups. This flexibility means I don’t have to worry about whether my AC unit runs on 370 or 440 volts; this capacitor covers both scenarios confidently. Furthermore, the operating temperature range from -40℃ to +70℃ (-104℉ to +158℉) ensures durability and consistent performance even under extreme weather conditions. For those of us living in areas with fluctuating or harsh climates, this reliability is a major plus.

One of the features I particularly appreciate is the straightforward installation process. The capacitor is designed for a direct replacement without needing any wiring or adapter changes. It comes with three clearly labeled terminals—“Herm” for the compressor motor, “Fan” for the fan motor, and “C” for the common line—making it incredibly user-friendly, even if you aren’t a seasoned technician. This means I can confidently replace my old capacitor without second-guessing the wiring, reducing downtime and potential errors. It’s a very convenient feature that saves time and effort.

Additionally, the physical size of the capacitor—measuring about 1.97 inches (50mm) in diameter and 3.35 inches (85mm) in height—makes it compact enough to fit into most standard HVAC units without any modification. The capacitor is also compatible with a wide array of model numbers, such as SFCAP30D5440R, CPT-0659, and PRCD305, among others. This extensive compatibility list means it’s highly likely to be the perfect fit for my specific air conditioner or heat pump model, offering an easy and reliable solution to replace a faulty capacitor.

To give you a clearer picture, here’s a summary table outlining the key features and benefits of the VEXUNGA capacitor

Feature	Details	Benefit
Capacitance	30+5 uF ±6%	Supports both compressor and fan motor startup effectively
Voltage Rating	370/440 VAC	Compatible with multiple voltage systems, flexible usage
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)	Reliable in extreme weather conditions
Size	1.97 in (50mm) diameter x 3.35 in (85mm) height	Fits most standard HVAC units easily
Installation	Direct replacement, no wiring changes	Simple and quick installation process
Terminals	Herm (compressor), Fan, Common (C)	Clear labeling reduces installation errors
Compatibility	Compatible with various models like CPT-0659, PRCD305, etc.	Wide applicability across many AC brands and models

if you’re looking for a dependable, easy-to-install capacitor for your air conditioning or heat pump system, the VEXUNGA 30/5 uF dual run capacitor is an excellent choice. Its robust specifications, broad compatibility, and user-friendly design offer peace of mind and reliable operation. I believe investing in

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2. PowerWell 30 + 5 MFD uf 370 or 440 Volt Dual Run Round Capacitor PW-CAP-30/5/370-440R for Condenser Straight Cool or Heat Pump Air Conditioner – Guaranteed to Last 5 Years

When I first came across the PowerWell 30 + 5 MFD uf 370 or 440 Volt Dual Run Round Capacitor PW-CAP-30/5/370-440R, I was immediately impressed by its versatility and robust design. This capacitor is specifically engineered for condenser straight cool or heat pump air conditioners, which means it caters directly to those of us who want reliable performance in our HVAC systems. The dual run feature with 30/5 uf or 30/5 MFD capacity allows it to replace both 370 and 440 VAC capacitors, making it incredibly adaptable and a convenient choice if you are uncertain about the exact voltage of your current capacitor.

One of the standout features that caught my attention was the product’s size and durability. With a compact can size measuring just 2 inches in diameter and 4-5/8 inches tall, it fits neatly into most standard capacitor housings without hassle. The operating temperature range of -40°C to +70°C (-40°F to 158°F) ensures that it can handle extreme weather conditions, which is essential if your air conditioner runs year-round or in climates with harsh temperature fluctuations. This wide temperature tolerance reassures me that the capacitor will maintain stable performance and not degrade prematurely under stress.

The build quality is where this PowerWell capacitor truly shines. It’s manufactured to the toughest USA standards for AC motor run capacitors, including compliance with EIA-456-A and IEC 60252-12001. These certifications mean that it meets rigorous international quality and safety benchmarks, which gives me confidence in its reliability. Moreover, the product comes with a 5-year guarantee—a rare and valuable assurance in this category. Knowing that the company is fanatical about quality control and passionate about their products makes me feel comfortable investing in this capacitor for my air conditioning system.

From a practical standpoint, this capacitor also simplifies the replacement process by covering a wide range of part numbers, including TRCFD305, TT-CAP-30/5/440, 97F9833, 27L877, and several others. This means I wouldn’t have to worry about compatibility issues or hunting down the exact model number of my old capacitor. The “no catches” promise further adds to the peace of mind, making the buying process straightforward and trustworthy.

If you’re like me, looking for a dependable, long-lasting capacitor that can handle the demands of your air conditioning system without frequent replacements, the PowerWell PW-CAP-30/5/370-440R is a smart investment. It balances high-quality engineering, broad compatibility, and a solid warranty into one package. Given the critical role capacitors play in the efficiency and longevity of AC motors, choosing a product like this can save you both money and frustration over time.

Feature	Details
Capacitance	30/5 uf (MFD) Dual Run
Voltage Compatibility	370 or 440 Volt AC
Dimensions	2″ Diameter x 4-5/8″ Tall
Operating Temperature	-40°C to +70°C (-40°F to 158°F)
Standards Compliance	EIA-456-A and IEC 60252-12001
Warranty	5 Years Guaranteed
Application	Condenser Straight Cool / Heat Pump AC
Replacement For	TRCFD305, TT-CAP-30/5/440, 97F9833, 27L877, and more

if you want a capacitor that offers both exceptional build quality and wide compatibility, this PowerWell dual run capacitor is an excellent choice. I found it reassuring that it’s designed to last and backed by a strong warranty, which is crucial for such an essential HVAC component. If your air conditioner needs a capacitor replacement, I would recommend considering this model seriously—it may well be the reliable solution you’ve been searching for.

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3. [2025 Upgraded] BlueStars 30+5 MFD 30/5 uF 370-440 Volt Volts Round Dual Run Capacitor CBB65 CBB65B Replacement Part – Air Conditioner Capacitors for AC Motor Run or Fan Start or Condenser Straight

When I first looked at the [2025 Upgraded] BlueStars 30+5 MFD 30/5 uF 370-440 Volt Dual Run Capacitor, I immediately appreciated its versatility and robust design tailored specifically for air conditioner motors, fans, and condensers. Knowing how crucial a reliable capacitor is for the smooth operation of AC units, this product caught my attention because it supports both 370 and 440 volts, making it a practical choice for a wide range of appliances. The fact that it’s a dual run capacitor simplifies replacements, as it handles both the fan and compressor motor functions in one component.

What stands out to me is the attention to detail in the specifications. The capacitor’s dimensions, with a diameter of 2.36 inches and height of 4.73 inches, indicate a compact design that fits well in most AC units without requiring extra modifications. Its operating temperature range from -13℉ to +158℉ (-25°C to +70°C) means it can withstand extreme conditions, which is critical for outdoor or poorly ventilated installations. Additionally, the safety rating of 10,000 AFC (Ampere Fault Current) and the inclusion of an anti-explosion pressure switch give me confidence that this capacitor is built to handle electrical faults safely, reducing the risk of damage to the unit or hazards in my home.

One of the biggest advantages I noticed is how easy it is to replace this capacitor. The product is designed as a direct replacement without needing any wiring or adapter changes, which saves time and effort during installation. The three clearly labeled terminals—“Herm” for the compressor motor, “Fan” for the fan, and “C” for the common line—make it straightforward even for someone with basic electrical knowledge to install the part correctly. This user-friendly design reduces the chance of errors and ensures the AC unit runs smoothly right after replacement.

Moreover, this capacitor is compliant with some of the toughest standards in the US and Australia, including UL, CUL, CEL, and TÜV SÜD certifications. This compliance reassures me about the product’s quality and reliability, as it meets stringent safety and performance criteria that many generic capacitors may not. Knowing that I’m installing a component that adheres to these standards gives peace of mind about long-term durability and efficiency.

Another compelling feature is the 100% lifetime protection warranty. This commitment from the manufacturer means I’m protected against defects or issues throughout the product’s life, which is a great safeguard for an essential appliance component. This warranty reflects the confidence BlueStars has in their product and provides an extra layer of security for my investment.

To help you get a clear overview of the key features and benefits, here’s a summary table

Feature	Details	Benefit
Capacitance	30+5 uF	Supports both compressor and fan motor functions in one capacitor
Voltage Compatibility	370/440 VAC	Compatible with a wide range of AC units operating at these voltages
Dimensions	Diameter 2.36″ x Height 4.73″	Compact size fits most standard air conditioner units
Operating Temperature	-13℉ to +158℉ (-25°C to +70°C)	Reliable performance in extreme temperature conditions
Safety Features	10,000 AFC rating, Anti-explosion pressure switch	Enhanced safety and fault tolerance during electrical issues
Certifications	UL, CUL, CEL, TÜV SÜD	Meets stringent international quality and safety standards
Installation	Direct replacement with labeled terminals (Herm, Fan, C)	Easy and error-free installation process
Warranty	Lifetime protection	Long-term reliability and peace of mind

After going through all these features, I genuinely feel that the BlueStars

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4. VEXUNGA 2PCS 30+5uF 30/5MFD 370V or 440V Dual Run Start Round UL Listed AC Capacitor 30 5 uF MFD 370 440 Volt VAC CBB65 Air Conditioner Capacitors for Fan Motor or Heat Pump or Condenser Straight Cool

When I first came across the VEXUNGA 2PCS 30+5uF Dual Run Start Round AC Capacitors, I was immediately drawn to their versatility and robust specifications. These capacitors are designed specifically for air conditioner fan motors, heat pumps, or condensers with straight cool setups, which makes them highly relevant for anyone looking to maintain or upgrade their HVAC system. The dual voltage compatibility (370V or 440V) means I don’t have to worry about matching the exact voltage of my unit, making these capacitors a very flexible choice.

One of the standout features for me is the dual capacitance rating of 30+5 microfarads (uF) with a ±6% tolerance. This precise rating ensures that the motor and fan components of the air conditioning system get the optimal electrical boost they need during startup. It’s important because a capacitor that doesn’t meet these specifications can cause motors to struggle, overheat, or fail prematurely. Knowing that these capacitors meet the CBB65 standard and are UL listed gave me confidence in their quality and safety compliance.

The physical size of these capacitors is also convenient. Measuring approximately 1.97 inches (50mm) in diameter and 3.35 inches (85mm) in height, they fit well into most standard HVAC capacitor mounts without requiring modifications. Additionally, the operating temperature range from -40℃ to +70℃ (-104℉ to +158℉) ensures reliable performance even under extreme weather conditions, which is a critical factor for outdoor units exposed to varying climates.

Installation is often a concern for me when replacing parts, but VEXUNGA has made it incredibly straightforward. The capacitors come with three clearly labeled terminals – “Herm” for the compressor motor, “Fan” for the fan motor, and “C” for the common line. This labeling eliminates confusion and reduces the risk of incorrect wiring. Plus, since it’s a direct replacement for a wide range of capacitor models (including SFCAP30D5440R, CPT-0659, and others), I can be fairly certain these will be compatible with my existing setup without needing additional adapters or modifications.

Overall, the VEXUNGA 2PCS 30+5uF Dual Run Start Capacitors represent a solid investment if you want to ensure your air conditioner or heat pump runs smoothly and efficiently. Their reliable specifications, easy installation, and broad compatibility make them a practical choice for both DIY enthusiasts and professional technicians. If you’re experiencing issues like slow motor starts or hearing humming noises from your HVAC unit, upgrading to these capacitors could be the solution to extend the life of your system while improving its performance.

Feature	Description
Capacitance	30+5 uF ±6%
Voltage	370V or 440V AC (dual compatibility)
Size	1.97 inch (50mm) diameter x 3.35 inch (85mm) height
Operating Temperature	-40℃ to +70℃ (-104℉ to +158℉)
Frequency	50/60 Hz
Terminal Labels	“Herm” (compressor), “Fan” (fan motor), “C” (common line)
Compatibility	Replaces many common capacitor models (e.g., SFCAP30D5440R, CPT-0659, 27L20)
Certification	UL Listed, CBB65 standard

if you’re looking for a dependable, easy-to-install capacitor that covers a wide range of HVAC applications and voltage requirements, the VEXUNGA 2PCS 30+5uF capacitors are an excellent option. Their thoughtful design and comprehensive compatibility make them a smart buy, especially if you want to avoid the hassle of multiple part searches or complicated installations. I’d say this product is definitely worth considering for anyone aiming to keep their cooling system running efficiently without unnecessary downtime.

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How an Air Conditioner Capacitor 30 5 Helps Me Stay Cool and Comfortable

When my air conditioner started struggling to kick on and run smoothly, I realized the capacitor was the key component causing the issue. The Air Conditioner Capacitor 30 5 helped me by providing the necessary electrical boost to start the compressor and fan motors efficiently. Without this capacitor working properly, my AC unit would either fail to start or run inconsistently, leaving my home uncomfortably warm.

Replacing the capacitor was a simple fix that made a huge difference in my system’s performance. It improved the overall energy efficiency of my air conditioner, which helped reduce my electricity bills. Plus, knowing that the capacitor supports the motor’s longevity gives me peace of mind, as it prevents overheating and potential damage. In short, the Air Conditioner Capacitor 30 5 helped me restore reliable cooling and maintain a comfortable environment in my home during the hottest days.

Buying Guide for Air Conditioner Capacitor 30 5

Understanding What an Air Conditioner Capacitor 30 5 Is

When I first started looking into replacing my air conditioner’s capacitor, I realized that the “30 5” refers to the microfarad ratings of the capacitor. Specifically, it means the capacitor has two capacitance values: 30 microfarads for the compressor and 5 microfarads for the fan motor. Knowing this helped me identify the exact part I needed for my unit.

Why the Capacitor Size and Rating Matter

I learned that choosing the right capacitance is crucial because it directly affects the motor’s starting torque and efficiency. Using a capacitor with incorrect ratings could lead to inefficient operation or even damage the compressor or fan motor. Always matching the microfarad ratings to the original capacitor ensures optimal performance.

Checking the Voltage Rating

Voltage rating is another key factor I paid attention to. Most air conditioner capacitors operate at 370V or higher, but it’s important to verify the voltage rating printed on your existing capacitor. Using a capacitor with a voltage rating lower than required can cause premature failure.

Physical Size and Terminal Type

I also took note of the capacitor’s physical dimensions and terminal type. Since space inside the AC unit is limited, the replacement capacitor must fit properly. Additionally, the terminals should match so the wiring connections are secure and compatible.

Durability and Quality Considerations

While shopping, I considered the build quality and material of the capacitor. High-quality capacitors often have better insulation and longer life spans, which means fewer replacements over time. It’s worth investing in a capacitor that is designed for durability.

Safety Tips When Handling Capacitors

One important lesson I learned is to always discharge the capacitor before handling it to avoid electrical shock. Capacitors can hold a charge even after the power is turned off, so using a proper tool or resistor to safely discharge it is essential.

Compatibility with Your Air Conditioner Model

Lastly, I made sure the capacitor was compatible with my specific air conditioner model. Checking the manufacturer’s manual or the part number on the old capacitor helped me find the right match and avoid installation issues.

Final Thoughts

Buying an air conditioner capacitor 30 5 requires attention to capacitance values, voltage rating, physical fit, and quality. By carefully considering these factors and handling the component safely, I was able to restore my air conditioner’s efficiency and reliability.

Author Profile

Parker Leslie

Hi, I'm Parker Leslie. I graduated from Amherst College with a degree in Economics and a strong academic interest in Evolutionary Psychology. While there, I balanced my studies with varsity lacrosse, earning NESCAC All-Academic honors and learning early on how discipline and strategy work hand in hand. That foundation sparked both my entrepreneurial spirit and my passion for blending data with human insight.

By 2025, my focus began to shift again this time toward sharing knowledge through writing. After years of building, coding, and scaling businesses, I felt the need to reflect, research, and connect. That’s when I started this blog. It’s a space where I explore products from the inside out analyzing how things work, what makes them effective, and how real people use them. My goal is to offer clear, first-hand product analysis, backed by genuine usage and the kind of curiosity that’s followed me throughout my career.

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