---
product_id: 505800647
title: "[UL Listed] BlueStars 40 uF MFD 370-440 VAC Volts CBB65A Round Run Start Capacitor - for AC Motor Run or Fan Start Cool Heat Pump Air Conditioner or Condenser Straight - Lifetime up to 30,000 Hours"
brand: "bluestars"
price: "¥5301"
currency: JPY
in_stock: true
reviews_count: 13
category: "Blue Stars"
url: https://www.desertcart.jp/products/505800647-ul-listed-bluestars-40-uf-mfd-370-440-vac-volts
store_origin: JP
region: Japan
---

# 30,000 hrs lifetime durability 40 µF high capacitance 370-440 VAC wide voltage range [UL Listed] BlueStars 40 uF MFD 370-440 VAC Volts CBB65A Round Run Start Capacitor - for AC Motor Run or Fan Start Cool Heat Pump Air Conditioner or Condenser Straight - Lifetime up to 30,000 Hours

**Brand:** bluestars
**Price:** ¥5301
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your AC’s heartbeat with BlueStars — power, precision, and peace of mind!

## Quick Answers

- **What is this?** [UL Listed] BlueStars 40 uF MFD 370-440 VAC Volts CBB65A Round Run Start Capacitor - for AC Motor Run or Fan Start Cool Heat Pump Air Conditioner or Condenser Straight - Lifetime up to 30,000 Hours by bluestars
- **How much does it cost?** ¥5301 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/505800647-ul-listed-bluestars-40-uf-mfd-370-440-vac-volts)

## 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

- • **Built to Last:** Engineered for up to 30,000 hours of continuous operation, minimizing downtime and costly repairs.
- • **Power Your Comfort:** Reliable 40 µF capacitance ensures smooth AC motor and fan starts every time.
- • **Plug & Play Installation:** No rewiring needed—clearly labeled terminals make DIY replacement effortless and safe.
- • **Certified Safety & Quality:** UL, CUL, CE, and TÜV SÜD approved for peace of mind in your home or office.
- • **Universal Voltage Compatibility:** Works seamlessly across 370-440 VAC systems—one capacitor to rule them all.

## Overview

The BlueStars 40 µF CBB65A Round Run Start Capacitor is a premium, UL-listed component designed for AC motors, fans, heat pumps, and condensers. Operating reliably within a 370-440 VAC range and rated for up to 30,000 hours, it offers a perfect direct replacement with easy installation and robust safety certifications, making it the go-to choice for proactive professionals and DIYers aiming to avoid costly HVAC failures.

## Description

[UL Listed] BlueStars 40 uF MFD 370-440 VAC Volts CBB65A Round Run Start Capacitor - for AC Motor Run or Fan Start Cool Heat Pump Air Conditioner or Condenser Straight - Lifetime up to 30,000 Hours: desertcart.com: Industrial & Scientific

Review: Easy install, fixed the heater right away - Installed this BlueStars 7.5 µF capacitor as a replacement and it was super easy to install. The fit was correct and everything hooked up without any issues. Once installed, the heater started working great immediately. No humming, no delays it did exactly what it was supposed to do. Solid replacement part and saved me from a more expensive repair. Would definitely buy again.
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.

## Features

- MODEL NUMBER - 40 uF/MFD 370-440VAC Round Run Start Capacitor. Replaces BOTH 370VAC & 440VAC capacitors round motor run capacitor
- SPECIFICATIONS - Capacitance: 40 uf; Rated voltage: AC 370-440V; Tolerance: 5%; Shape: Round Run - Capacitor dimensions: 50mm x 105mm; Operating temperature range: -25℃ to 70℃; temperature coefficient : 40/70/21; 10000AFC - 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
- EXACT REPLACEMENT: It is a perfect replacement to solve cooling problems for your air conditioner and gear motor applications. Multi-Purpose Round Capacitor for Air Conditioner AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool
- INSTRUCTIONS: No wiring or adapter changes are required. Two terminals on the top are labeled "Herm"/"H" for the compressor motor or "Fan"/"F" for the fan, and "C" for the common line.
- 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 | B0BL77F3CY |
| Best Sellers Rank | #1,394 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Electrical Capacitors |
| Brand Name | BlueStars |
| Capacitance | 40 Microfarad |
| Capacitance Tolerance | 5 |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,188) |
| Included Components | 40 MFD 370-440 VAC CBB65A Capacitor |
| Item Dimensions W x H | 1.97"W x 4.13"H |
| Item Shape | Round |
| Manufacturer | BlueStars |
| Material Type | 40 MFD 370-440VAC |
| Maximum Storage Temperature | 70 Degrees Celsius |
| Maximum Voltage | 440 Volts |
| Model | [Upgraded] 40uf 370-440VAC |
| Mounting Type | Snap-In Mount |
| Operating Voltage | 440 Volts |
| Part Number | [Upgraded] 40uf 370-440VAC |
| Upper Temperature Rating | 70 Degrees Celsius |

## Product Details

- **Brand:** BlueStars
- **Capacitance:** 40 Microfarad
- **Material:** 40 MFD 370-440VAC
- **Maximum Storage Temperature:** 70 Degrees Celsius
- **Shape:** Round

## Images

![[UL Listed] BlueStars 40 uF MFD 370-440 VAC Volts CBB65A Round Run Start Capacitor - for AC Motor Run or Fan Start Cool Heat Pump Air Conditioner or Condenser Straight - Lifetime up to 30,000 Hours - Image 1](https://m.media-amazon.com/images/I/71S7qns+uqL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy install, fixed the heater right away
*by R***L on January 29, 2026*

Installed this BlueStars 7.5 µF capacitor as a replacement and it was super easy to install. The fit was correct and everything hooked up without any issues. Once installed, the heater started working great immediately. No humming, no delays it did exactly what it was supposed to do. Solid replacement part and saved me from a more expensive repair. Would definitely buy again.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Research before you spend a lot of money
*by P***O on April 4, 2026*

Great product. Installed it in a pool heater, working great. Instead of client buying a new one for $3,500.00 and$1,000.00 to install, a $23.00 capacitor did the trick.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-07-07*