---
product_id: 628666032
title: "Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight"
brand: "hvac yellow hat"
price: "HK$204"
currency: HKD
in_stock: true
reviews_count: 12
category: "Hvac Yellow Hat"
url: https://www.desertcart.hk/products/628666032-capacitor-for-air-conditioner-40-5-uf-mfd-370-440
store_origin: HK
region: Hong Kong
---

# 40+5 µF dual capacitance 440V heavy-duty rating -40°C to +85°C operating temp Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight

**Brand:** hvac yellow hat
**Price:** HK$204
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your cool with precision and durability!

## Quick Answers

- **What is this?** Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight by hvac yellow hat
- **How much does it cost?** HK$204 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/628666032-capacitor-for-air-conditioner-40-5-uf-mfd-370-440)

## Best For

- hvac yellow hat enthusiasts

## Why This Product

- Trusted hvac yellow hat brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Legacy & Modern Compatible:** Ideal for upgrading or maintaining older AC units, with universal terminal layout for easy install.
- • **Dual Capacitance Powerhouse:** 40+5 µF combo supports both motor run & fan start circuits seamlessly.
- • **Built for Extreme Conditions:** Operates reliably from freezing -40°C up to scorching 85°C, perfect for any climate.
- • **Heavy-Duty Voltage Endurance:** Rated up to 440V to handle voltage spikes and extend AC system lifespan.
- • **Precision Performance Guaranteed:** ±5% capacitance tolerance ensures your AC runs efficiently without hiccups.

## Overview

This multi-purpose 40+5 µF round capacitor is engineered for air conditioner motor run and fan start applications, rated for 370V or 440V operation. Built to USA EIA-456-A standards, it offers a wide operating temperature range (-40°C to 85°C) and tight ±5% capacitance tolerance, ensuring reliable performance and longevity. Its robust aluminum housing and universal terminal layout make it a trusted choice for both legacy HVAC systems and proactive maintenance upgrades.

## Description

Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight: desertcart.com: Industrial & Scientific

Review: Reliable Spec Part—Returned After Fan Upgrade, Still Worth Considering for Legacy AC Systems - During a recent AC compressor overhaul, I purchased this 5µF capacitor as part of a proactive component refresh. I also installed a **dual-run capacitor** rated for both the compressor and fan circuits, anticipating the need for a separate fan capacitor alongside the new condenser fan motor. The 5µF unit arrived quickly, packaged securely with no terminal damage. The aluminum housing was solid, terminals spaced well, and the labeling was clear—ideal for quick identification during install prep. However, the fan motor I ended up installing had a **built-in capacitor**, which meant I didn’t need this standalone part. Instead, I wired the motor directly into the dual-run capacitor using the standard C, FAN, and HERM terminal layout. This worked flawlessly and simplified the system wiring. That’s the key takeaway for buyers: newer fan motors often include internal capacitors, so before sourcing a separate one, check your motor’s spec label or wiring diagram. If your system uses an older motor, this 5µF capacitor appears reliable and well-suited for run/start support. Even though it was returned unused, the build quality and delivery experience made a positive impression. If I were working on a legacy unit again—or troubleshooting a standalone fan circuit—this would be on my shortlist
Review: Tested out perfect. - I have been a ARIZONA registered master heat pump technician for over 25 years. The problem I have noticed with capacitors is that many of them are defective out of the box. The reason I say that is I test the microfarads while the capacitor is under load which will tell me it’s exact microfarad rating. This is done by checking the amps and volts wile it is running. I use what I call the 2652 method. The simple formula is Start Winding Amps X 2,652 ÷ Capacitor Voltage = Microfarads. Sample: 5 amps Times 2652 divided 369 volts =35µF This is the correct way to test a capacitor. There are meters that have capacitor testers settings on them but I never used them because they are pretty much useless unless you just wanna know what size it is. You need to put a capacitor under load to make sure it doesn’t have any leaking Through that dielectric. This capacitor I have bought several times and it is exact to what it is rated at. Some brands of air conditioners you will find bad capacors on every one of them when you fire them up new. I don’t wanna mention any names but one that does this the most makes air conditioners that start with the letter C and another brand with the letter B. They actually buy rejected capacitors for their units to get them cheaper so sad. It’s very important to have a correctly size capacitor to create a third leg properly. This is basically making a third phase. If you’re capacitor is leaking electricity through the dielectric it will shorten the life of your unit. About 25% of brand new air conditioner run capacitors do not pass the test. They can only be as far as 10% off of what they’re rated at is there any greater than that it’s best to throw them away. It’s also a good thing to change your air conditioning run capacitor at least every four years. In hotter states possibly more often. They make a 370 V and the 440 V capacitors I highly recommend going with the 440 V rating it will put up with more heat and will last longer. The 440 V rating only means how much electricity it can handle. So it’s basically heavier duty than the 380V ones. Your air conditioner might be 220 V but when the compressor is running the voltage across the run cap can double that. So be warned if you’re going to test a live Ron cab you’re going to have to be extremely careful because the voltage coming off that run cap can kill you. With that being said I recommend this brand.

## Features

- 40+5uf / 40+5MFD 370 Volt or 440 Volt Capacitor. Replaces BOTH 370VAC & 440VAC capacitors round motor run capacitor
- Operating Temperature:-40°C to +85°C(std.) /-40℉ to 185℉.Capacitance Range: 3-120 uF/Capacitance Tolerance: ±5% (std.) -others available. Operating Frequency: 50-60 Hz
- Built to the USA standards for AC motor run capacitors： EIA-456-A 10000AFC PROTECTED / NON-PCB'S
- Can size measures 1.97" diameter x 3.94" tall
- Multi-Purpose Round Capacitor for Air Conditioner AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BHVCFNLB |
| Best Sellers Rank | #14,685 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #27 in Industrial Electrical Capacitors |
| Capacitance Tolerance | 5 |
| Date First Available | October 11, 2022 |
| Item Weight | 7.4 ounces |
| Item model number | 40+5MFD |
| Manufacturer | HVAC YELLOW HAT |
| Maximum Voltage | 440 Volts |
| Mounting Type | Wall Mount |
| Product Dimensions | 1.97"W x 4.92"H |
| Upper Temperature Rating | 185 Degrees Fahrenheit |

## Product Details

- **Brand:** HVAC YELLOW HAT
- **Capacitance:** 40 Microfarad
- **Material:** Copper
- **Operating Voltage:** 440 Volts
- **Shape:** Round

## Images

![Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight - Image 1](https://m.media-amazon.com/images/I/41NHFB5G3TL.jpg)
![Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight - Image 2](https://m.media-amazon.com/images/I/41ji2r3mRnL.jpg)
![Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight - Image 3](https://m.media-amazon.com/images/I/41jv7qEyRAL.jpg)
![Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight - Image 4](https://m.media-amazon.com/images/I/512+nhiAmEL.jpg)
![Capacitor for Air Conditioner 40+5 uf MFD 370 or 440 Volt VAC, Multi-Purpose Round Capacitor for AC Motor Run or Fan Motor Start or Condenser Straight - Image 5](https://m.media-amazon.com/images/I/513asOSSgpL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable Spec Part—Returned After Fan Upgrade, Still Worth Considering for Legacy AC Systems
*by J***. on July 18, 2025*

During a recent AC compressor overhaul, I purchased this 5µF capacitor as part of a proactive component refresh. I also installed a **dual-run capacitor** rated for both the compressor and fan circuits, anticipating the need for a separate fan capacitor alongside the new condenser fan motor. The 5µF unit arrived quickly, packaged securely with no terminal damage. The aluminum housing was solid, terminals spaced well, and the labeling was clear—ideal for quick identification during install prep. However, the fan motor I ended up installing had a **built-in capacitor**, which meant I didn’t need this standalone part. Instead, I wired the motor directly into the dual-run capacitor using the standard C, FAN, and HERM terminal layout. This worked flawlessly and simplified the system wiring. That’s the key takeaway for buyers: newer fan motors often include internal capacitors, so before sourcing a separate one, check your motor’s spec label or wiring diagram. If your system uses an older motor, this 5µF capacitor appears reliable and well-suited for run/start support. Even though it was returned unused, the build quality and delivery experience made a positive impression. If I were working on a legacy unit again—or troubleshooting a standalone fan circuit—this would be on my shortlist

### ⭐⭐⭐⭐⭐ Tested out perfect.
*by H***S on June 30, 2022*

I have been a ARIZONA registered master heat pump technician for over 25 years. The problem I have noticed with capacitors is that many of them are defective out of the box. The reason I say that is I test the microfarads while the capacitor is under load which will tell me it’s exact microfarad rating. This is done by checking the amps and volts wile it is running. I use what I call the 2652 method. The simple formula is Start Winding Amps X 2,652 ÷ Capacitor Voltage = Microfarads. Sample: 5 amps Times 2652 divided 369 volts =35µF This is the correct way to test a capacitor. There are meters that have capacitor testers settings on them but I never used them because they are pretty much useless unless you just wanna know what size it is. You need to put a capacitor under load to make sure it doesn’t have any leaking Through that dielectric. This capacitor I have bought several times and it is exact to what it is rated at. Some brands of air conditioners you will find bad capacors on every one of them when you fire them up new. I don’t wanna mention any names but one that does this the most makes air conditioners that start with the letter C and another brand with the letter B. They actually buy rejected capacitors for their units to get them cheaper so sad. It’s very important to have a correctly size capacitor to create a third leg properly. This is basically making a third phase. If you’re capacitor is leaking electricity through the dielectric it will shorten the life of your unit. About 25% of brand new air conditioner run capacitors do not pass the test. They can only be as far as 10% off of what they’re rated at is there any greater than that it’s best to throw them away. It’s also a good thing to change your air conditioning run capacitor at least every four years. In hotter states possibly more often. They make a 370 V and the 440 V capacitors I highly recommend going with the 440 V rating it will put up with more heat and will last longer. The 440 V rating only means how much electricity it can handle. So it’s basically heavier duty than the 380V ones. Your air conditioner might be 220 V but when the compressor is running the voltage across the run cap can double that. So be warned if you’re going to test a live Ron cab you’re going to have to be extremely careful because the voltage coming off that run cap can kill you. With that being said I recommend this brand.

### ⭐⭐⭐⭐⭐ Great for the price
*by P***G on October 8, 2025*

Super easy to install, works effectively. My AC guy wanted to charge me $85, so much better.

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-20*