---
product_id: 4041344
title: "CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units"
price: "€ 77.85"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.be/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to
store_origin: BE
region: Belgium
---

# Reduces high amp start-up time Saves money by extending compressor life Multi-layer starting capacitor for power boost CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units

**Price:** € 77.85
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your A/C start with smart savings!

## Quick Answers

- **What is this?** CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units
- **How much does it cost?** € 77.85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Swift Power Boost:** Cut compressor start-up amps and protect your system instantly.
- • **Professional Grade:** Designed by technicians for technicians, ensuring top-tier performance and durability.
- • **Smart Start Technology:** Integrated multi-layer capacitor and smart switch ensure reliable, efficient compressor activation.
- • **Cost-Effective Protection:** Prevent costly compressor replacements with an affordable saver that extends equipment lifespan.
- • **Plug & Play Compatibility:** Fits 1 to 3 ton A/C units seamlessly, making upgrades hassle-free and future-proof.

## Overview

The CPS 5-2-1 CSRU1 Compressor Saver is a compact, professional-grade device designed to reduce compressor start-up amps for 1 to 3 ton A/C units. Featuring a multi-layer starting capacitor and smart switch, it enhances compressor reliability, lowers power draw, and extends equipment life—offering an affordable alternative to costly compressor replacements. Installation by a licensed technician is recommended.

## Description

Product description CPS CSRU1 | 5-2-1 Compressor Saver 5-2-1 Compressor Saver: CSRU1 For 1-2-3 Tons Tons For Scroll/Reciprocating Starting up is the hardest time in the life of any type of electrical equipment. Ever notice that light bulbs almost always burn out when you first turn them on and not while they are on? This is due to the huge current that rushes in when a switch is thrown and power is first applied. The compressor on your Air Conditioner consumes more power on start-up than any other device in your home. A compressor may consume 45,000 watts of power while the motor is trying to start-TEN times more power than it uses while running. The large burner on an electric stove only consumes approximately 2,000 watts on high. In-rush current can damage the compressor’s motor and that motor may start up more than 6,000 times in a single cooling season. Features A 5-2-1 COMPRESSOR SAVER significantly reduces the amount of time your compressor is on high amp start-up. Some top-of-the-line A/C units come from the factory with 5-2-1 technology built in. Now you can have a 5-2-1 COMPRESSOR SAVER installed in your A/C unit by a professional. The 5-2-1 COMPRESSOR SAVER uses a powerful multi-layer starting capacitor and a smart switch to give your compressor the boost it needs to start up quickly, more reliably, draw less power and save you money, too. The CSRU1 5-2-1 Compressor Saver has been pre-wired (see wiring diagram) for your convenience. There are only 3 color-coded wires which need to be connected. The Black wire will be connected to the Common side of the compressor. The Striped wire will be connected to the Start winding of the compressor and the Red wire will be connected to the Run winding of the compressor. Remember–5,2,1 = Common, Start, Run.

Review: Easy to install, MUCH cheaper than a a service call, and MUCH MUCH cheaper than a new AC! LOVE IT! - This thing is truly nothing short of a miracle. We have a mini-split heat pump installed in a guest house and had been receiving complaints from the neighbor that the thing sounded like a wounded yak every time it started up. It was making an ungodly loud buzzing sound, BRRRRAAAAAAAANNNNNNZZZZZZ for about 15 seconds, then would give up and try again a minute or so later. it would do this 5 or 6 times before finally kicking in and even then, would sound sort of anemic. We had a tech out (from a company with hundreds of 5-star Yelp reviews), and they said that the refrigerant levels were OK, the capacitors were OK -- it was just old and in need of replacement. I did a little research and decided to try a hard-start kit before ponying up for a new AC and I'm so glad I did. I had to do a little reading to make sure I understood where the 5-2-1 Compressor Saver was supposed to be installed and discovered that I needed to splice a couple of wires to make it work, since I didn't have enough free posts on the top of the existing run capacitor, but even so, installation took only 10 minutes and the problem was solved! The AC now engages instantly and runs silently. I love it so much, I'm getting another for an LG ArtCool I have installed at another location. The 120 AC shares a circuit with outdoor lights and dims them every time the compressor kicks in; the literature that came with this unit says it will solve this problem too, so I'm anxious to give it a shot. Great product, 1/4 the cost of a service call, and easy to install and use. Shipping was fast and free with Prime. Seriously, this thing works so well and with so little effort, I have a hard time believing it! I keep asking the neighbor if all is well and looking for clouds of smoke on the roof, but after several days of very hot weather, it looks like a winner.
Review: Great to revive a tired, worn compressor - My a/c unit is getting old. The compressor is weak and beginning to drag on start-up, drawing more amps than the breakers can handle. All last year, house lights would dim when the compressor kicked on and by the end of summer last year the circuit breakers began to trip at start-up. I called my HVAC guy and he came out and put on a small 2 wire hard start kit which cost $100 for the kit and $75 dollars for installation. It got my a/c working again , but by mid winter my heat pump quit working and we were forced to heat the house with the back-up electric heat strips in the furnace. Needless to say our electric bill was twice what it would have been had the compressor worked for the heat pump but we were in the middle of winter and there was no way we could afford a new system. This year I called around to get estimates on a new a/c unit and after recovering from the shock of what it was going to cost, I decided to try one more attempt to get my compressor starting again. I pulled off the $175 hard start kit only to discover it was burned to a crisp. When I installed the new 521 hard start kit, my compressor fired right up... no lights dimmed ... no breakers tripped, and it's been running perfect for almost three months now. This is a great product, very heavy duty with great build quality and cost a fraction of what I paid a "Professional" last year. I ordered it from desertcart and installed it myself. Installation was super easy. Instructions were good, but for additional reassurance, I watched a couple of videos. A/c compressors don't last forever and eventually they will have to be replaced. If your unit hasn't locked up yet , these 521's may be a life-saver and buy you some time. They could maybe even fix the problem all together until it becomes someone else's problem further down the road. WELL worth the money and I will buy again if needed.

## Features

- BOOST START-UP: A 5-2-1 Compressor Saver significantly reduces the amount of time your compressor is on high amp start-up. Some top-of-the-line A/C units come from the factory with 5-2-1 technology built in. Now you can have a 5-2-1 Compressor Saver installed in your A/C unit by a professional!
- THE RELIABLE CHOICE: The compression savor uses a powerful multi-layer starting capacitor and a smart switch to give your compressor the boost it needs to start up quickly, more reliably, draw less power and save you money, too
- AFFORDABILITY: The cost of a 5-2-1 Compression Savor is a fraction of the cost of replacing a compressor damaged by hard starts. It could add years to the life of your compressor and other electrical components associated with your A/C system
- ADDITIONAL INFORMATION: This product should only be installed by a licensed technician
- ABOUT US: CPS Products is a business built by technicians, for technicians. We design Tools for the Professional Service Technician. With the world’s most comprehensive range of Leak Detection technologies, Smart Diagnostic tools, and proven Maintenance Solutions, CPS Products has been The Workingman’s Choice since 1989

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Five Two One Inc |
| Part Number | CSR-U1 |
| Item Weight | 0.8 ounces |
| Product Dimensions | 0.1 x 0.1 x 0.1 inches |
| Item model number | CSR-U1 |
| Is Discontinued By Manufacturer | No |
| Size | 1-2-3 Tons |
| Color | Black / Red |
| Style | Portable |
| Material | Plastic |
| Power Source | Corded Electric |
| Voltage | 0.1 Volts |
| Item Package Quantity | 1 |
| Type of Bulb | CSRU1 |
| Special Features | Compressor Saver |
| Included Components | Compressor Saver, multi-layer starting capacitor, smart switch, color-coded wires |
| Batteries Included? | No |
| Batteries Required? | No |

## Images

![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 1](https://m.media-amazon.com/images/I/51uR1I9zNJL.jpg)
![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 2](https://m.media-amazon.com/images/I/61H6YBVEfgL.jpg)
![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 3](https://m.media-amazon.com/images/I/51LrAKsUTgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy to install, MUCH cheaper than a a service call, and MUCH MUCH cheaper than a new AC! LOVE IT!
*by L***A on June 17, 2015*

This thing is truly nothing short of a miracle. We have a mini-split heat pump installed in a guest house and had been receiving complaints from the neighbor that the thing sounded like a wounded yak every time it started up. It was making an ungodly loud buzzing sound, BRRRRAAAAAAAANNNNNNZZZZZZ for about 15 seconds, then would give up and try again a minute or so later. it would do this 5 or 6 times before finally kicking in and even then, would sound sort of anemic. We had a tech out (from a company with hundreds of 5-star Yelp reviews), and they said that the refrigerant levels were OK, the capacitors were OK -- it was just old and in need of replacement. I did a little research and decided to try a hard-start kit before ponying up for a new AC and I'm so glad I did. I had to do a little reading to make sure I understood where the 5-2-1 Compressor Saver was supposed to be installed and discovered that I needed to splice a couple of wires to make it work, since I didn't have enough free posts on the top of the existing run capacitor, but even so, installation took only 10 minutes and the problem was solved! The AC now engages instantly and runs silently. I love it so much, I'm getting another for an LG ArtCool I have installed at another location. The 120 AC shares a circuit with outdoor lights and dims them every time the compressor kicks in; the literature that came with this unit says it will solve this problem too, so I'm anxious to give it a shot. Great product, 1/4 the cost of a service call, and easy to install and use. Shipping was fast and free with Prime. Seriously, this thing works so well and with so little effort, I have a hard time believing it! I keep asking the neighbor if all is well and looking for clouds of smoke on the roof, but after several days of very hot weather, it looks like a winner.

### ⭐⭐⭐⭐⭐ Great to revive a tired, worn compressor
*by R***. on September 5, 2014*

My a/c unit is getting old. The compressor is weak and beginning to drag on start-up, drawing more amps than the breakers can handle. All last year, house lights would dim when the compressor kicked on and by the end of summer last year the circuit breakers began to trip at start-up. I called my HVAC guy and he came out and put on a small 2 wire hard start kit which cost $100 for the kit and $75 dollars for installation. It got my a/c working again , but by mid winter my heat pump quit working and we were forced to heat the house with the back-up electric heat strips in the furnace. Needless to say our electric bill was twice what it would have been had the compressor worked for the heat pump but we were in the middle of winter and there was no way we could afford a new system. This year I called around to get estimates on a new a/c unit and after recovering from the shock of what it was going to cost, I decided to try one more attempt to get my compressor starting again. I pulled off the $175 hard start kit only to discover it was burned to a crisp. When I installed the new 521 hard start kit, my compressor fired right up... no lights dimmed ... no breakers tripped, and it's been running perfect for almost three months now. This is a great product, very heavy duty with great build quality and cost a fraction of what I paid a "Professional" last year. I ordered it from Amazon and installed it myself. Installation was super easy. Instructions were good, but for additional reassurance, I watched a couple of videos. A/c compressors don't last forever and eventually they will have to be replaced. If your unit hasn't locked up yet , these 521's may be a life-saver and buy you some time. They could maybe even fix the problem all together until it becomes someone else's problem further down the road. WELL worth the money and I will buy again if needed.

### ⭐⭐⭐⭐⭐ Removes hvac industry license to scam and steal
*by R***L on May 6, 2026*

Works great on my trane x12. It literally saved me at least $10,000. Hvac servicemen told me to replace the locked compressor with a new unit. Due too having to use a new type freon because of global warming it would have to be a new furnace also. So they tell you you can't fix it and you must spend 10k to replace it. Well fortunately with advice from a family member, a little you tube research and amazon this fixed the compressor start up. 5 minutes to plug in and mount. Took away hvac industry scam license to steal for now.

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---

*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-05-26*