--- product_id: 541628035 title: "[UL Listed] BlueStars 3 uF MFD ±5% 370-440VAC Volt CBB65 Oval Run Start Capacitor 50/60 Hz AC Electric Replacement Part - for Central Air-Conditioners Heat Pumps Condenser Fan Motors AC Compressors" brand: "bluestars" price: "€ 23.36" currency: EUR in_stock: true reviews_count: 13 category: "Blue Stars" url: https://www.desertcart.pt/products/541628035-ul-listed-bluestars-3-uf-mfd-5-370-440vac-volt store_origin: PT region: Portugal --- # 3uF capacitance ±5% precision 370-440VAC high voltage rating 10000 AFC anti-explosion safety [UL Listed] BlueStars 3 uF MFD ±5% 370-440VAC Volt CBB65 Oval Run Start Capacitor 50/60 Hz AC Electric Replacement Part - for Central Air-Conditioners Heat Pumps Condenser Fan Motors AC Compressors **Brand:** bluestars **Price:** € 23.36 **Availability:** ✅ In Stock ## Summary > ⚙️ Power your comfort with precision and safety — don’t get left in the heat! ## Quick Answers - **What is this?** [UL Listed] BlueStars 3 uF MFD ±5% 370-440VAC Volt CBB65 Oval Run Start Capacitor 50/60 Hz AC Electric Replacement Part - for Central Air-Conditioners Heat Pumps Condenser Fan Motors AC Compressors by bluestars - **How much does it cost?** € 23.36 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/541628035-ul-listed-bluestars-3-uf-mfd-5-370-440vac-volt) ## Best For - bluestars enthusiasts ## Why This Product - Trusted bluestars brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Lifetime Confidence:** Backed by 100% lifetime protection—never worry about premature failure again. - • **Safety-First Design:** Equipped with a 10000 AFC anti-explosion pressure switch for ultimate peace of mind. - • **DIY-Friendly Upgrade:** Snap-in mount and exact OEM dimensions make replacement quick, easy, and cost-saving. - • **Precision Power Boost:** 3uF capacitance with tight ±5% tolerance ensures reliable motor startup every time. - • **High Voltage Endurance:** Rated for 370-440VAC, built to handle demanding HVAC systems without compromise. ## Overview The BlueStars 3uF ±5% 370-440VAC Oval Run Start Capacitor is a UL-listed, premium-quality replacement part engineered for central air conditioners, heat pumps, and condenser fan motors. Featuring a robust aluminum casing, precise capacitance stability, and a high safety rating with a 10000 AFC anti-explosion switch, it ensures reliable motor startups and long-lasting performance. Designed for easy DIY installation with exact OEM fitment and backed by a lifetime warranty, it’s the smart choice to avoid costly HVAC repairs and keep your system running smoothly. ## Description [UL Listed] BlueStars 3 uF MFD ±5% 370-440VAC Volt CBB65 Oval Run Start Capacitor 50/60 Hz AC Electric Replacement Part - for Central Air-Conditioners Heat Pumps Condenser Fan Motors AC Compressors: desertcart.com: Industrial & Scientific Review: Solid product and a good value - Capacitors are wear items that are best either proactively replaced before they go bad or, at the very least, you should keep a properly rated spare on hand for when the one in your current AC unit inevitably quits. Furthermore, replacing a capacitor is a job that is well within the average DIY’er with nothing but the most basic tools required. There are plenty of YouTube videos on how to do it and do so safely. That is, unless you want to pay an HVAC repair company $200/$300/$400 or more when your capacitor quits (and it will eventually) on the hottest day of the year. Yes, that is what they charge to replace a capacitor. This Blue Stars brand dual run capacitor arrived promptly and when tested with my Klein MM700 multimeter was almost spot on the label rating and well within the claimed 5% tolerance. Replaced an aging Dayton (Grainger) part number 2MEK3B of the same specifications (50 + 7.5 mfd) in a 20 year old Lennox central air unit (not the original capacitor). The dimensions of the Blue Stars capacitor (both diameter and height) matched the Dayton unit being replaced exactly and were consistent with the product listing. The capacitor being replaced was still working and tested OK so it will go on the shelf as a spare. The capacitor itself is clearly marked (C=common, FAN, and HERM (compressor)). Terminals feel solid as does the metal (aluminum) casing. Did not weigh it but felt as heavy (if not slightly more) than the capacitor it was replacing. The product labeling clearly shows China as the place of manufacture but claims it is UL (USA) and CE (Europe) certified (but I have no way to verify this). Product listing in desertcart states a 100% lifetime warranty. Can’t vouch for that either. When installed and tested, the AC unit fired right up with the new capacitor. Far less expensive than I could find locally (Southwest Ohio). Certainly inexpensive enough to either purchase to have a spare on hand or, like me, proactively swap out an aging part before a problem occurs so I could do it at my convenience and schedule. As noted above, replacing a capacitor is not rocket science and within the ability of anyone that can replace a household light switch. Just make sure you get a capacitor of the right microfarad (MFD) rating for your application and TURN OFF THE POWER before you even think about starting the project. This means either flipping the circuit breaker in the main panel for the AC unit off or using the exterior safety disconnect switch where the AC interconnects to the house power. Simply turning off the switch on the furnace or thermostat IS NOT ENOUGH. Also, a capacitor, even one that has failed, can hold a residual charge and, therefore, make sure you discharge the old unit. Again, there are many videos available on how to do this and do it safely. Do some homework if this is new to you as saving a few dollars is not worth a serious injury or electrocution. Can’t comment yet on durability or service life but will update if it fails prematurely. Otherwise, a good solid product and an excellent value. Five (blue) Stars. DISCLAIMER: I am a member of the desertcart Vine program. This means that I receive some products free of charge to use and review. I only request/accept items I will actually use. My reviews are based on this real-world usage – they are not mere regurgitations of the desertcart product description or insincere hype. I am not a shill and I do not consider the fact that an item was provided without charge as part of my ratings. I have given Vine products one star, five stars, and all points in between. I put serious effort into my reviews and they represent my honest opinion of the product. My hope it they will help someone make an informed, educated choice whether or not a product is right for them. Review: Perfect Replacement Capacitor – Saved Me $300! - I bought this 7.5 μF run capacitor to replace the weak blower motor capacitor in my HVAC system after a maintenance tech quoted me $300, and doing it myself was much easier than expected. I shut off power at the furnace switch and breaker, removed the blower door, located the old capacitor, took a quick picture of the two purple wires, then disconnected them and safely discharged the capacitor by touching both terminals together with an insulated-handle screwdriver. After removing it from the mounting clamp, I installed the new capacitor, tightened the clamp, pushed the connectors on firmly until they were fully seated, closed the blower door to engage the safety switch, restored power, and tested the system. The blower started instantly, airflow improved noticeably, and the whole HVAC system runs smoother now. The specs matched perfectly, quality seems excellent, and replacing it myself saved me a full $300. Highly recommended for anyone comfortable with basic DIY work. ## Features - WHAT YOU GET - 3uF mfd ±5% 370-440VAC Volt Oval Run Start Capacitor - SPECIFICATIONS - Capacitance: 3uf; Rated voltage: 370-440V; Tolerance: +/-5%; Shape: Oval Run; Capacitor dimensions: 31.5mm x 51.5mm x 55mm; Operating temperature range: -25℃ to +70℃/ -13℉ to 158℉; No PCBs. Engineered for safety 10000 AFC anti explosion pressure switch - REPLACEMENT FOR - Rheem Ruud Weatherking 43-25134-01, 43-20847-01, 43-20847-02, 43-19182-01, 43-19182-02, 43-100496-02, 800P305H37A and other Start Capacitors with this uF/Mfd & VAC Rating - PREMIUM QUALITY - The replacement part is made from durable high-quality aluminum and well-tested by the manufacturer - Meets OEM standards - Ensures long-lasting and effective performance. This capacitor will provide your electric motors with an outstanding electrical characteristic of high capacitance stability over time and temperature, and very low internal power loss - 100% LIFETIME PROTECTION: Enjoy reliable performance with our lifetime protection, ensuring that your product will always be covered for any defects or issues that may arise. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0C3HJDGLC | | Best Sellers Rank | #2,403 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Industrial Electrical Capacitors | | Capacitance Tolerance | 5 | | Date First Available | June 18, 2022 | | Item Weight | 3.84 ounces | | Item model number | 370-440VAC | | Manufacturer | BlueStars | | Maximum Voltage | 440 Volts | | Mounting Type | Snap-In Mount | | Operating Voltage | 440 Volts | | Package Dimensions | 3.23 x 2.17 x 1.34 inches | | Upper Temperature Rating | 70 Degrees Celsius | ## Product Details - **Brand:** BlueStars - **Capacitance:** 3 Microfarad - **Material:** 3 MFD 370-440VAC - **Maximum Storage Temperature:** 70 Degrees Celsius - **Shape:** Oval ## Images ![[UL Listed] BlueStars 3 uF MFD ±5% 370-440VAC Volt CBB65 Oval Run Start Capacitor 50/60 Hz AC Electric Replacement Part - for Central Air-Conditioners Heat Pumps Condenser Fan Motors AC Compressors - Image 1](https://m.media-amazon.com/images/I/71bRbiWMMjL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Solid product and a good value *by D***. on April 13, 2024* Capacitors are wear items that are best either proactively replaced before they go bad or, at the very least, you should keep a properly rated spare on hand for when the one in your current AC unit inevitably quits. Furthermore, replacing a capacitor is a job that is well within the average DIY’er with nothing but the most basic tools required. There are plenty of YouTube videos on how to do it and do so safely. That is, unless you want to pay an HVAC repair company $200/$300/$400 or more when your capacitor quits (and it will eventually) on the hottest day of the year. Yes, that is what they charge to replace a capacitor. This Blue Stars brand dual run capacitor arrived promptly and when tested with my Klein MM700 multimeter was almost spot on the label rating and well within the claimed 5% tolerance. Replaced an aging Dayton (Grainger) part number 2MEK3B of the same specifications (50 + 7.5 mfd) in a 20 year old Lennox central air unit (not the original capacitor). The dimensions of the Blue Stars capacitor (both diameter and height) matched the Dayton unit being replaced exactly and were consistent with the product listing. The capacitor being replaced was still working and tested OK so it will go on the shelf as a spare. The capacitor itself is clearly marked (C=common, FAN, and HERM (compressor)). Terminals feel solid as does the metal (aluminum) casing. Did not weigh it but felt as heavy (if not slightly more) than the capacitor it was replacing. The product labeling clearly shows China as the place of manufacture but claims it is UL (USA) and CE (Europe) certified (but I have no way to verify this). Product listing in Amazon states a 100% lifetime warranty. Can’t vouch for that either. When installed and tested, the AC unit fired right up with the new capacitor. Far less expensive than I could find locally (Southwest Ohio). Certainly inexpensive enough to either purchase to have a spare on hand or, like me, proactively swap out an aging part before a problem occurs so I could do it at my convenience and schedule. As noted above, replacing a capacitor is not rocket science and within the ability of anyone that can replace a household light switch. Just make sure you get a capacitor of the right microfarad (MFD) rating for your application and TURN OFF THE POWER before you even think about starting the project. This means either flipping the circuit breaker in the main panel for the AC unit off or using the exterior safety disconnect switch where the AC interconnects to the house power. Simply turning off the switch on the furnace or thermostat IS NOT ENOUGH. Also, a capacitor, even one that has failed, can hold a residual charge and, therefore, make sure you discharge the old unit. Again, there are many videos available on how to do this and do it safely. Do some homework if this is new to you as saving a few dollars is not worth a serious injury or electrocution. Can’t comment yet on durability or service life but will update if it fails prematurely. Otherwise, a good solid product and an excellent value. Five (blue) Stars. DISCLAIMER: I am a member of the Amazon Vine program. This means that I receive some products free of charge to use and review. I only request/accept items I will actually use. My reviews are based on this real-world usage – they are not mere regurgitations of the Amazon product description or insincere hype. I am not a shill and I do not consider the fact that an item was provided without charge as part of my ratings. I have given Vine products one star, five stars, and all points in between. I put serious effort into my reviews and they represent my honest opinion of the product. My hope it they will help someone make an informed, educated choice whether or not a product is right for them. ### ⭐⭐⭐⭐⭐ Perfect Replacement Capacitor – Saved Me $300! *by P***P on December 9, 2025* I bought this 7.5 μF run capacitor to replace the weak blower motor capacitor in my HVAC system after a maintenance tech quoted me $300, and doing it myself was much easier than expected. I shut off power at the furnace switch and breaker, removed the blower door, located the old capacitor, took a quick picture of the two purple wires, then disconnected them and safely discharged the capacitor by touching both terminals together with an insulated-handle screwdriver. After removing it from the mounting clamp, I installed the new capacitor, tightened the clamp, pushed the connectors on firmly until they were fully seated, closed the blower door to engage the safety switch, restored power, and tested the system. The blower started instantly, airflow improved noticeably, and the whole HVAC system runs smoother now. The specs matched perfectly, quality seems excellent, and replacing it myself saved me a full $300. Highly recommended for anyone comfortable with basic DIY work. ### ⭐⭐⭐⭐⭐ Good Quality. *by M***E on October 21, 2025* This item was used on the squirrel cage fan in my AC unit. Sam 20uF cap. works great! I have no complaints. this item appears to be of good quality with no noticeable discrepancies. very easy to install. I hope the lifespan is good. I will update if it goes out. otherwise it's still working for me. Its a good price, good product. I'd recommend this. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/541628035-ul-listed-bluestars-3-uf-mfd-5-370-440vac-volt](https://www.desertcart.pt/products/541628035-ul-listed-bluestars-3-uf-mfd-5-370-440vac-volt) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-04-22*