---
product_id: 343269190
title: "[UL Certified] BlueStars 50+5 MFD 50/5 uF 370 or 440 Volt VAC Dual Run Start Round AC Capacitor Replacement Part - Fit for Condenser Straight Cool Heat Pump Air Conditioner, Replaces 97F9850 97F9970"
brand: "bluestars"
price: "$55"
currency: NZD
in_stock: true
reviews_count: 13
category: "Blue Stars"
url: https://www.desertcart.nz/products/343269190-ul-certified-bluestars-50-5-mfd-50-5-uf-370
store_origin: NZ
region: New Zealand
---

# 50+5 MFD dual capacitance 370-440V high voltage rating 10000 AFC anti-explosion safety [UL Certified] BlueStars 50+5 MFD 50/5 uF 370 or 440 Volt VAC Dual Run Start Round AC Capacitor Replacement Part - Fit for Condenser Straight Cool Heat Pump Air Conditioner, Replaces 97F9850 97F9970

**Brand:** bluestars
**Price:** $55
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your comfort with confidence — never sweat a capacitor fail again!

## Quick Answers

- **What is this?** [UL Certified] BlueStars 50+5 MFD 50/5 uF 370 or 440 Volt VAC Dual Run Start Round AC Capacitor Replacement Part - Fit for Condenser Straight Cool Heat Pump Air Conditioner, Replaces 97F9850 97F9970 by bluestars
- **How much does it cost?** $55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/343269190-ul-certified-bluestars-50-5-mfd-50-5-uf-370)

## 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:** Dual run capacitor with exact 50/5 µF capacitance and ±5% tolerance ensures peak AC motor efficiency.
- • **Safety-First Engineering:** Equipped with a 10000 AFC anti-explosion pressure switch for ultimate peace of mind during operation.
- • **Universal Fit & Easy DIY:** Compact 2.36" x 4.73" round design replaces multiple OEM parts, perfect for hassle-free, cost-saving self-installation.
- • **Heavy-Duty Voltage Endurance:** Operates reliably at 370-440 VAC, built to handle demanding HVAC systems without compromise.
- • **Lifetime Reliability Guarantee:** Backed by a 100% lifetime protection warranty, ensuring your investment stays protected long-term.

## Overview

The UL Certified BlueStars 50+5 MFD dual run capacitor is a premium replacement part designed for condenser, straight cool, and heat pump AC units. Rated for 370-440 volts AC with a tight ±5% capacitance tolerance, it features a robust aluminum casing and a 10000 AFC anti-explosion pressure switch for enhanced safety. Its universal round form factor fits a wide range of OEM models, making it an ideal DIY upgrade that saves costly HVAC repair fees. Backed by a lifetime warranty, this capacitor delivers reliable, long-lasting performance to keep your cooling system running smoothly.

## Description

[UL Certified] BlueStars 50+5 MFD 50/5 uF 370 or 440 Volt VAC Dual Run Start Round AC Capacitor Replacement Part - Fit for Condenser Straight Cool Heat Pump Air Conditioner, Replaces 97F9850 97F9970: 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 - 50+5 MFD uf PW-50/5/R 370V/440V Dual Run Circular Start Capacitor
- SPECIFICATIONS - Capacitance: 50/5uf; Rated voltage: AC 370-440V; Tolerance : +/-5%; Shape: Round Run; Capacitor dimensions: 2.36 inch x 4.73 inch / 60mm x 120mm; Operating temperature range: -25℃ to +70℃/ -13℉ to 158℉; 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
- REPLACEMENT FOR - 97F9850 97F9970 97F9970BZ3 TRCFD505 RC0120 12790 RC0121 1094993 38514D018 P2915053R HC98CA050 P291-5053RS 024-25338-000 43-25133-25 P291-5053R HC98JA051 43-23204-15 432320415 05706036 D6789043 B94577400 B945774-00 CARG32458 TT-CAP-50/5/440R 27L601 TP-CAP-50/5/440R HCKS500D050R440Z B9457-7400
- 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 | B094C7PZLJ |
| Best Sellers Rank | #2,438 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Industrial Electrical Capacitors |
| Capacitance Tolerance | 5 |
| Date First Available | May 7, 2021 |
| Item Weight | 10.2 ounces |
| Item model number | 50+5 MFD uf |
| Manufacturer | BlueStars |
| Maximum Voltage | 440 Volts |
| Mounting Type | Panel Mount |
| Operating Voltage | 440 Volts |
| Package Dimensions | 5.31 x 2.52 x 2.48 inches |
| Upper Temperature Rating | 70 Degrees Celsius |

## Product Details

- **Brand:** BlueStars
- **Capacitance:** 50 Microfarad
- **Material:** 50+5 MFD 370-440VAC
- **Maximum Storage Temperature:** 70 Degrees Celsius
- **Shape:** Round

## Images

![[UL Certified] BlueStars 50+5 MFD 50/5 uF 370 or 440 Volt VAC Dual Run Start Round AC Capacitor Replacement Part - Fit for Condenser Straight Cool Heat Pump Air Conditioner, Replaces 97F9850 97F9970 - Image 1](https://m.media-amazon.com/images/I/61UkBLrmzTL.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.

## Frequently Bought Together

- BlueStars 50+5 MFD uf 370 or 440 Volt VAC Dual Run Circular Start Capacitor Replacement Part - Exact Fit for Condenser Straight Cool or Heat Pump Air Conditioner - Replaces 97F9850 97F9970
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- 45+5 uF 45/5 MFD ±6% 370V/440V CBB65 AC Capacitor, Dual Run Round Capacitor Replacement, 45 5 uF 440 Volt HVAC Capacitor for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-16*