---
product_id: 464912953
title: "[UL Certified] BlueStars 45 uF 45 MFD +5% 370-440VAC 50/60Hz Round Run Start Capacitor Replacement Part - Fit for AC Motor Run or Fan Start and Cool or Heat Pump Air Conditioner"
brand: "bluestars"
price: "143.68 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Blue Stars"
url: https://www.desertcart.tn/products/464912953-ul-certified-bluestars-45-uf-45-mfd-5-370-440vac
store_origin: TN
region: Tunisia
---

# 45 µF capacitance precision 370-440VAC high voltage rating UL & TÜV safety certified [UL Certified] BlueStars 45 uF 45 MFD +5% 370-440VAC 50/60Hz Round Run Start Capacitor Replacement Part - Fit for AC Motor Run or Fan Start and Cool or Heat Pump Air Conditioner

**Brand:** bluestars
**Price:** 143.68 DT
**Availability:** ✅ In Stock

## Summary

> ⚙️ Power your comfort with confidence — upgrade your AC’s heart today!

## Quick Answers

- **What is this?** [UL Certified] BlueStars 45 uF 45 MFD +5% 370-440VAC 50/60Hz Round Run Start Capacitor Replacement Part - Fit for AC Motor Run or Fan Start and Cool or Heat Pump Air Conditioner by bluestars
- **How much does it cost?** 143.68 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/464912953-ul-certified-bluestars-45-uf-45-mfd-5-370-440vac)

## 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

- • **Precision Power Boost:** 45 µF ±5% capacitance ensures optimal motor performance and energy efficiency.
- • **Lifetime Peace of Mind:** Backed by a 100% lifetime warranty, ensuring your investment is protected against defects and failures.
- • **DIY-Friendly Quick Swap:** Direct replacement design with easy top terminals—no rewiring or adapters needed, saving you time and service costs.
- • **Certified Safety Assurance:** UL, CUL, CEL & TÜV SÜD certifications guarantee top-tier safety and reliability standards.
- • **Heavy-Duty Voltage Endurance:** Rated for 370-440VAC, built to handle demanding AC motor and HVAC loads without fail.

## Overview

The BlueStars 45 µF Run Start Capacitor is a UL-certified, high-voltage replacement part designed for AC motors and HVAC systems. Engineered with a precise 45 µF capacitance and rated for 370-440VAC, it meets stringent US and Australian safety standards including TÜV SÜD certification. Its round, compact design fits seamlessly into existing setups, enabling hassle-free DIY installation. With a robust operating temperature range (-25℃ to 70℃) and a lifetime warranty, this capacitor offers reliable, long-lasting performance that helps you avoid costly HVAC repairs and downtime.

## Description

Product description BlueStars AC Capacitor 4 EASY STEPS TO INSTALL Step 1 Turn off the power and locate the capacitor Step 2 Discharge any stored electricity by shorting the terminals Step 3 Take a photo or note how the wires connect. Disconnect wires & install the new capacitor. Step 4 Reassemble and test

Review: Easy and fast repair - Capacitor is as described. Works great in my AC unit. For $20 vesus $150 or more that the HVAC company was going to charge. Just pull the power on the wall, remove the cover and then one screw and 3 wires is all it takes. Even people less handy can do this and save a bunch of money.
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

- NOTE: Please check technical specifications of your appliances before purchasing, or you can send us your model number, we will confirm the compatibility
- MODEL NUMBER - 45 uF 45 MFD +5% 370-440VAC 50/60Hz Round Run Start Capacitor Replacement Part
- SPECIFICATIONS - Capacitance: 45 uf; Rated voltage: AC 370-440V; Tolerance: 5%; Shape: Round Run; Capacitor dimensions: 1.79in x 4.14in (50mm x 105mm); Operating temperature range: -25℃ to 70℃; Engineered For Safety 10 000 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
- SUPER EASY to Replace: Direct replacement, No wiring or adapter changes required. Capacitor has two terminals on 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 | B0B24XKZ8S |
| Best Sellers Rank | #706 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Electrical Capacitors |
| Brand | BlueStars |
| Brand Name | BlueStars |
| Capacitance | 45 Microfarad |
| Capacitance Tolerance | 5 |
| Customer Reviews | 4.6 out of 5 stars 2,232 Reviews |
| Included Components | 45 MFD 370-440 VAC CBB65 Capacitor |
| Item Dimensions W x H | 1.97"W x 4.13"H |
| Item Shape | Round |
| Manufacturer | BlueStars |
| Material | 45 MFD 370-440VAC |
| Material Type | 45 MFD 370-440VAC |
| Maximum Storage Temperature | 70 Degrees Celsius |
| Maximum Voltage | 440 Volts |
| Model | 45uf 370-440VAC |
| Mounting Type | Surface Mount |
| Operating Voltage | 440 Volts |
| Part Number | 45uf 370-440VAC |
| Shape | Round |
| Upper Temperature Rating | 70 Degrees Celsius |

## Product Details

- **Capacitance:** 45 Microfarad
- **Brand:** BlueStars
- **Material:** 45 MFD 370-440VAC
- **Shape:** Round
- **Operating Voltage:** 440 Volts

## Images

![[UL Certified] BlueStars 45 uF 45 MFD +5% 370-440VAC 50/60Hz Round Run Start Capacitor Replacement Part - Fit for AC Motor Run or Fan Start and Cool or Heat Pump Air Conditioner - Image 1](https://m.media-amazon.com/images/I/71OEPii5FmL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy and fast repair
*by L***R on April 26, 2026*

Capacitor is as described. Works great in my AC unit. For $20 vesus $150 or more that the HVAC company was going to charge. Just pull the power on the wall, remove the cover and then one screw and 3 wires is all it takes. Even people less handy can do this and save a bunch of money.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-07-09*