---
product_id: 616248757
title: "[UL Certified] 70 uF MFD 370-440VAC Volts ±5% Round Run Capacitor 50/60 Hz AC Electric Replacement Part by Blue Stars"
brand: "bluestars"
price: "$46.70"
currency: USD
in_stock: true
reviews_count: 13
category: "Blue Stars"
url: https://www.desertcart.us/products/616248757-ul-certified-70-uf-mfd-370-440vac-volts-5-round
store_origin: US
region: United States of America
---

# 70 µF high capacitance -25°C to 70°C operating range UL & international safety certified [UL Certified] 70 uF MFD 370-440VAC Volts ±5% Round Run Capacitor 50/60 Hz AC Electric Replacement Part by Blue Stars

**Brand:** bluestars
**Price:** $46.70
**Availability:** ✅ In Stock

## Summary

> 🛠️ Upgrade your AC game with BlueStars — power, safety, and reliability in one sleek capacitor!

## Quick Answers

- **What is this?** [UL Certified] 70 uF MFD 370-440VAC Volts ±5% Round Run Capacitor 50/60 Hz AC Electric Replacement Part by Blue Stars by bluestars
- **How much does it cost?** $46.70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/616248757-ul-certified-70-uf-mfd-370-440vac-volts-5-round)

## 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:** 70 µF ±5% capacitance ensures optimal motor performance and energy efficiency.
- • **Lifetime Peace of Mind:** Backed by a 100% lifetime warranty, so you’re covered for the long haul.
- • **Plug & Play Simplicity:** Labeled terminals (Herm, Fan, Common) make installation a breeze—no rewiring needed.
- • **Built to Brave Extremes:** Operates flawlessly from -25°C to 70°C, perfect for any climate or environment.
- • **Certified Safety Assurance:** UL, CUL, CE & TÜV SÜD certifications guarantee top-tier safety and reliability.

## Overview

The BlueStars 70 µF Round Run Capacitor is a UL-certified, dual-run capacitor designed for 370-440VAC systems. It features a ±5% capacitance tolerance, operates reliably between -25°C and 70°C, and meets stringent US and international safety standards. With easy installation via clearly labeled terminals and a robust aluminum casing, it’s engineered for long-lasting performance and comes with a lifetime warranty, making it the smart choice for proactive HVAC maintenance or emergency replacement.

## Description

[UL Certified] 70 uF MFD 370-440VAC Volts ±5% Round Run Capacitor 50/60 Hz AC Electric Replacement Part by Blue Stars: 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

- NOTE: Please check technical specifications of your appliances before purchasing, or you can send us your model number, we will confirm the compatibility
- PART NUMBER: 70 uF MFD uf 370 or 440 Volt VAC Round Dual Run Capacitor.
- SPECIFICATIONS: - Dimensions: Diameter 2.36" (60 mm) x Height 4.73" (120 mm) - Operating Temperature Range: -13℉ to +158℉/ -25°C to +70°C - No PCBs. Engineered for safety 10000 AFC anti explosion pressure switch
- INSTRUCTIONS: No wiring or adapter changes are required. Three terminals on the top are labeled "Herm"/"H" for the compressor motor, "Fan"/"F" for the fan, and "C" for the common line.
- PREMIUM QUALITY: Compliant with the TOUGHEST US and Australian Standards for AC motor run capacitors, including UL & CUL, CEL and TÜV SÜD
- 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 | B0CJTZWGGX |
| Best Sellers Rank | #1,200 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Electrical Capacitors |
| Brand Name | BlueStars |
| Capacitance | 70 Microfarad |
| Capacitance Tolerance | 5 |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,123) |
| Included Components | 70 MFD 370-440VAC Capacitor |
| Item Dimensions W x H | 2.36"W x 4.72"H |
| Item Shape | Round |
| Manufacturer | BlueStars |
| Material Type | 70 MFD 370-440VAC |
| Maximum Storage Temperature | 70 Degrees Celsius |
| Maximum Voltage | 440 Volts |
| Mounting Type | Surface Mount |
| Operating Voltage | 440 Volts |
| Upper Temperature Rating | 70 Degrees Celsius |

## Product Details

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

## Images

![[UL Certified] 70 uF MFD 370-440VAC Volts ±5% Round Run Capacitor 50/60 Hz AC Electric Replacement Part by Blue Stars - Image 1](https://m.media-amazon.com/images/I/710hTkTxpCL.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.

### ⭐⭐⭐⭐⭐ 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.

---

## 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.us/products/616248757-ul-certified-70-uf-mfd-370-440vac-volts-5-round](https://www.desertcart.us/products/616248757-ul-certified-70-uf-mfd-370-440vac-volts-5-round)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-11*