--- product_id: 435435094 title: "540-648 uF MFD 110-125 VAC Run Motor Start Capacitor | Fits OEM Single Phase Motor Capacitors Condenser Heat Pump Air Conditioner" brand: "bluestars" price: "¥5583" currency: JPY in_stock: true reviews_count: 8 category: "Blue Stars" url: https://www.desertcart.jp/products/435435094-540-648-uf-mfd-110-125-vac-run-motor-start store_origin: JP region: Japan --- # 540-648 uF capacitance range 110-125 VAC operating voltage Wide -40℉ to +149℉ temp range 540-648 uF MFD 110-125 VAC Run Motor Start Capacitor | Fits OEM Single Phase Motor Capacitors Condenser Heat Pump Air Conditioner **Brand:** bluestars **Price:** ¥5583 **Availability:** ✅ In Stock ## Summary > ⚡ Power your gear with confidence — the capacitor that never quits! ## Quick Answers - **What is this?** 540-648 uF MFD 110-125 VAC Run Motor Start Capacitor | Fits OEM Single Phase Motor Capacitors Condenser Heat Pump Air Conditioner by bluestars - **How much does it cost?** ¥5583 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/435435094-540-648-uf-mfd-110-125-vac-run-motor-start) ## 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 Peace of Mind:** Backed by lifetime protection for zero-hassle, long-term reliability - • **Power-Packed Precision:** High 540-648 uF capacitance ensures optimal motor start and run performance - • **Built to Brave Extremes:** Operates reliably from freezing -40℉ to scorching +149℉ for year-round durability - • **Universal Fit & Replace:** Seamlessly replaces OEM capacitors like 6FLL1 2MDU5 with quick 1/4" male connectors - • **Safety-First Engineering:** Equipped with 10,000 AFC anti-explosion pressure switch and no toxic PCBs ## Overview The 2025 Updated BlueStars 540-648 uF Run Round Start Capacitor is a premium, UL & TÜV certified replacement part designed for single-phase motors in air conditioners, heat pumps, and general electric motors. Featuring a robust 110-125 VAC rating, ±20% capacitance tolerance, and a wide operating temperature range (-40℉ to +149℉), it guarantees reliable motor startup and operation. Its universal fit with 1/4" quick-connect terminals and advanced safety features like a 10,000 AFC anti-explosion switch make installation easy and safe. Backed by lifetime protection, this capacitor is engineered for professionals who demand durability and peace of mind. ## Description [2025 Updated] BlueStars 540-648 uF MFD 110-125 VAC Volt Run Round Start Capacitor ±20% CD60 Replacement Part - Fit OEM Single Phase Motor Capacitors Condenser Straight Cool Heat Pump Air Conditioner: desertcart.com: Industrial & Scientific Review: Exact match - Easy to replace and works fine. Review: Great Capacitor, but you might not need it! - Purchased it because my air compressor kept tripping a breaker when it tried to start. Thinking it was the start capacitor, I purchased and installed this one (along with a new run capacitor because I thought they were both old so I might as well replace them both.) I turned on the compressor and...tripped the breaker. I tightened all the wire connections thinking that might be the problem and...tripped the breaker. Out of frustration and the need to have the compressor working, I took it to an electric motor repair shop. They tested the new capacitor (it was perfect) and installed it. Ran perfect. After paying $142 to the shop (grrr) I took it home and plugged it in. Tripped the breaker. Took it to another outlet on a different circuit and plugged it in. It started and ran perfectly. That's when it dawned on me that the problem was likely a faulty breaker. Switched out the breaker and flipped on the compressor. You guessed it, it ran fine. The moral of my $142 story is don't be dumb like me. Test your "bad" capacitor if you have that capability (I didn't). On the bright side, I have new start and run capacitors. :-) ## Features - WHAT YOU GET - 540-648 uf/MFD 110-125 VAC Run Round Start Capacitor. - SPECIFICATIONS - Capacitance: 540-648 uf/MFD; Rated voltage: AC 110-125 Volte; Tolerance : 20%; Shape: Round Run; Capacitor Dimensions: 1.8124 x 3.3884 inch (46 x 86 mm); Operating temperature range: -40℉ to + 149℉/ -40℃ to 65℃; No PCBs. Engineered for safety 10000 AFC anti explosion pressure switch - PREMIUM QUALITY: Compliant with the TOUGHEST US and Australian Standards for AC motor run capacitors, including UL & CUL, CEL and TÜV SÜD - UNIVERSAL REPLACEMENT: Replaces 6FLL1 2MDU5 CAP-540-110. Replaces any brand with the same capacitance capacity and voltage. Will work for 110-125VAC 1/4 in Male Quick-connect. Replaces: 6FLL1 2MDU5 CAP-540-110 - REPLACEMENT FOR: OEM Single Phase Motor Capacitors Condenser Straight Cool or Heat Pump Air Conditioner; for pool pump capacitor, water pumps, table saws and general electric motors. - EASY INSTALLATION: No need for wiring or adapter replacement. The capacitors feature two 1/4" terminal connectors and are equipped with a leakage protection resistor at the top - 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 | B09TKVVDPT | | Best Sellers Rank | #1,825 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Industrial Electrical Capacitors | | Brand | BlueStars | | Brand Name | BlueStars | | Capacitance Tolerance | 20% | | Customer Reviews | 4.4 out of 5 stars 95 Reviews | | Included Components | 1 | | Item Dimensions W x H | 1.81"W x 3.35"H | | Item Shape | Round | | Manufacturer | BlueStars | | Material | 540-648 MFD | | Material Type | 540-648 MFD | | Maximum Storage Temperature | 70 °C | | Maximum Voltage | 125 volts | | Model | 540-648 uf/MFD 110-125 VAC | | Mounting Type | Panel Mount | | Operating Voltage | 125 volts | | Part Number | 540-648 uf/MFD 110-125 VAC | | Shape | Round | | Upper Temperature Rating | 65 °C | ## Product Details - **Brand:** BlueStars - **Material:** 540-648 MFD - **Maximum Storage Temperature:** 70 Degrees Celsius - **Operating Voltage:** 125 Volts - **Shape:** Round ## Images ![540-648 uF MFD 110-125 VAC Run Motor Start Capacitor | Fits OEM Single Phase Motor Capacitors Condenser Heat Pump Air Conditioner - Image 1](https://m.media-amazon.com/images/I/71b3arfVRPL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What does "540-648 uF" mean?** A: "540-648 µF" in a motor run capacitor spec means it has a capacitance range of 540 to 648 microfarads (µF), determining its ability to store electrical energy. This range should match the motor's requirements for optimal operation. **Q: Can I replace a Motor Start Capacitor with a Motor Run Capacitor?** A: Start capacitors give a large capacitance value necessary for a motor to start for a very short period of time (usually seconds long). A start capacitor can never be used as a run capacitor because it cannot handle current continuously. **Q: I've installed the Capacitor, but my machine is still not functioning properly. What's the issue?** A: There might be several reasons for this such as: Incorrect installation, faulty motor, capacitor compatibility or other electrical issues. If the issue persists, please don't hesitate to reach out. We're here to help. **Q: Can a motor start capacitor rated 110-125 volts be hooked up to a 220 volt line input? Will it just burn out?** A: No. The voltage rating of a capacitor indicates the maximum voltage that it can handle safely. If you put a 110-120 capacitor where a 220V is required, it may start the motor a couple of times but will fail very soon. **Q: Can I repair the faulty Capacitor?** A: Capacitors are typically not designed for repair and are considered disposable components. We recommend you to replace by a new one. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Exact match *by A***J on July 28, 2026* Easy to replace and works fine. ### ⭐⭐⭐⭐⭐ Great Capacitor, but you might not need it! *by C***T on December 18, 2024* Purchased it because my air compressor kept tripping a breaker when it tried to start. Thinking it was the start capacitor, I purchased and installed this one (along with a new run capacitor because I thought they were both old so I might as well replace them both.) I turned on the compressor and...tripped the breaker. I tightened all the wire connections thinking that might be the problem and...tripped the breaker. Out of frustration and the need to have the compressor working, I took it to an electric motor repair shop. They tested the new capacitor (it was perfect) and installed it. Ran perfect. After paying $142 to the shop (grrr) I took it home and plugged it in. Tripped the breaker. Took it to another outlet on a different circuit and plugged it in. It started and ran perfectly. That's when it dawned on me that the problem was likely a faulty breaker. Switched out the breaker and flipped on the compressor. You guessed it, it ran fine. The moral of my $142 story is don't be dumb like me. Test your "bad" capacitor if you have that capability (I didn't). On the bright side, I have new start and run capacitors. :-) ### ⭐⭐⭐⭐⭐ Fit my air compressor motor housing *by D***E on May 9, 2026* Received the correct item and it fit directly into the motor housing on my air compressor. Unfortunately it was not the problem. I think my centrifugal switch is bad. So time for a new compressor. ## Frequently Bought Together - 540-648 uf/MFD 110-125 VAC Volt Run Round Start Capacitor ±20% Replacement Part by BlueStars - Fit for OEM Single Phase Motor Capacitors Condenser Straight Cool or Heat Pump Air Conditioner - VEXUNGA 25uF 25 MFD 370VAC 440VAC 450VAC 50/60Hz CBB65 C65R Run Start Capacitor for AC Unit Fan Motor Start or Pool Pump or Air Condenser Straight Cool - Premium 20 MFD uf ± 5% MFD 370 V VAC or 440 Volt Multi-Purpose Motor Run Round Capacitor by Blue Stars - Compatible for Air Conditioner or Heat Pump Condenser - Pack of 1 --- ## 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.jp/products/435435094-540-648-uf-mfd-110-125-vac-run-motor-start](https://www.desertcart.jp/products/435435094-540-648-uf-mfd-110-125-vac-run-motor-start) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-11*