--- product_id: 292715902 title: "SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque" brand: "supco" price: "฿3892" currency: THB in_stock: true reviews_count: 5 category: "Supco" url: https://www.desertcart.co.th/products/292715902-supco-spp6-relay-capacitor-hard-start-kit-with-500-increase store_origin: TH region: Thailand --- # 500% boost in starting torque Compatible with PSC single-phase A/C & heat pumps Easy 10-min professional install SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque **Brand:** supco **Price:** ฿3892 **Availability:** ✅ In Stock ## Summary > ⚡ Start Strong, Stay Cool — The Ultimate Hard Start Upgrade ## Quick Answers - **What is this?** SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque by supco - **How much does it cost?** ฿3892 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/292715902-supco-spp6-relay-capacitor-hard-start-kit-with-500-increase) ## Best For - supco enthusiasts ## Why This Product - Trusted supco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Quiet & Smooth Start:** Reduce startup noise and mechanical strain for lasting performance. - • **Smart Relay Protection:** Built-in relay disconnects capacitor post-start to extend motor life. - • **Versatile Compatibility:** Perfect for residential & commercial PSC A/C and heat pump systems. - • **Power Up with 500% More Torque:** Supercharge your compressor start-up effortlessly. - • **Plug & Play Professional Upgrade:** Quick install designed for savvy DIYers and pros alike. ## Overview The SUPCO SPP6 Hard Start Kit delivers a massive 500% increase in compressor starting torque, ensuring your PSC single-phase A/C and heat pump systems start faster and quieter. Featuring an integrated relay to protect your motor and designed for easy panel or surface mounting, this kit is a cost-effective, professional-grade solution favored by HVAC pros and savvy DIYers alike. ## Description Relay/CAPACITOR hard start kit 500% incr starting torque,increased compressor starting torque. Designed for use on permanent split CAPACITOR single phase a/c and heat pump systems. Multiple use includes: room air conditioner units, residential or commercial psc AC units.. the country of origin is china. Review: Worked perfectly Review: Worked great !!! Installed on my condenser because compressor was having issues starting. Completely fixed it ## Features - Relay/capacitor hard start kit 500% incr starting torque - Increased compressor starting torque. Designed for use on permanent split capacitor single phase a/C and heat pump systems - The country of origin is china ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002YTLFE | | Brand Name | Supco | | Capacitance | 156 Microfarad | | Customer Reviews | 4.6 4.6 out of 5 stars (1,746) | | Global Trade Identification Number | 00687152197361 | | Included Components | Electrical Replacement Parts^Electrical Replacement Parts^replacement-household-furnace-control-circuit-boards | | Item Dimensions W x H | 16.5W x 18.4H centimeters | | Item Shape | Round | | Item Type Name | Relay/Capacitor Hard Start Kit 500% Incr Starting Torque - 661389 | | Item Weight | 0.3 Pounds | | Manufacturer | SUPCO | | Material Type | Copper | | Maximum Voltage | 277 Volts | | Mounting Type | Panel Mount or Surface Mount | | Operating Voltage | 277 Volts | | UPC | 687152031528 687152197361 | | Unit Count | 1 Count | ## Product Details - **Brand:** Supco - **Capacitance:** 156 Microfarad - **Material:** Copper - **Operating voltage:** 277 Volts - **Shape:** Round ## Images ![SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque - Image 1](https://m.media-amazon.com/images/I/51BsUWQMdTL.jpg) ![SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque - Image 2](https://m.media-amazon.com/images/I/31LvJXYzB6L.jpg) ## Questions & Answers **Q: I live in Az.I need a hard start kit for a 30,000 btu 2.5 ton,which one do you recommend?** A: The Supco uses a Positive Temperature Coefficient Relay (as stated on their website) not a Potential Relay. Not Good! Only use Hard Start Kits that use a true Potential Relay. The RectorSeal Kickstart (2 wire) and the 5-2-1 Compressor Saver (3 wire) hard start kits use a Potential Relay. I recommend the Kickstart (it uses 2 wires that connect to the Run Capacitor - HERM and COM). But the Compressor Saver is also good (3 wires with one connecting to the common / ground on the Contactor relay). They both work the same way - the Potential Relay detects the pickup voltage (back EMF). This causes the relay to disconnect the start capacitor when the compressor reaches about 75% speed (usually less than a second). Note: Supco does have hard start kits with a Mechanical Potential Relay (Models 3W1, 3W2, & 3W3) but they are not available on Amazon. **Q: If there is an existing start capacitor, can you put this one in parallel with it or the run capacitor?** A: This takes the place of the start capacitor. It gives an old compressor a "punch" as it starts and it immediately goes out of the start up circuit. They work! It is wired in parallel with the run capacitor, which stays in teh circuit so your compressor will run more efficiently..electrically speaking. **Q: Can a hard start kit help an a/c compressor start when powered by a generator which more than satisfies the unit's FLA but is just shy of the LRA?** A: Greetings,I use these for my rental apartment AC units they keep these old units running and starting easy! They need to be checked every 2 year or so. If you are just shy of the Locked Rotor Amperage; The amperage the motor draws when the voltage is first applied to the motor and the rotor has not started to turn. This amperage is usually up to 300% of the motors running amperage. Once the rotor starts to turn the motor generates a back EMF (electro motive force) that opposes the high inrush current. This back EMF drives the amperage down until the motor gets up to its rated speed at which time the motor amperage will be at its run amperage. This device helps starting and should make you successful. Make sure that your line voltage is being properly supplied during the high current peak that you have proper AWG for the load and length from your generator to your compressor as it could be a voltage drop issue.Never the less a good part and should help.Best of LuckDarrell **Q: Is this pretty easy to install? Is it just removing two wires from the old capacitor and reattaching to the new hard start capacitor? Thanks.** A: The hard start cap installs in parallel with the old cap. You connect one wire to the common and one wire to the herm terminals on the old cap. This just gives the compressor an extra kick. I would recommend that you get the 5-2-1 hard start kit instead. I have tried both and the 5-2-1 works better. Just search on Amazon for 5-2-1 hard start kit. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by I***S on 2 October 2025* Worked perfectly ### ⭐⭐⭐⭐⭐ Review *by J***S on 6 December 2024* Worked great !!! Installed on my condenser because compressor was having issues starting. Completely fixed it ### ⭐⭐⭐⭐⭐ Review *by A***R on 17 July 2025* This was a 10 min install, but you need to savvy and comfortable working on electrical items, especially capacitors. There are You Tube videos that are constructive. After opening the nearby circuit breaker, opening up the electrical cover, grounding out the capacitor(s), and mounting/connecting the Hard Start kit, the kit performed as advertised. The AC compressor started up more easily and isn’t as loud at startup. This particular HS kit has an integrated Relay to disconnect its internal capacitor to prevent damage to the compressor motor after startup. Other comparable professional two wire or three wire HS kits cost about $150. My AC vendor offered to install their HS kit for $389, ## Frequently Bought Together - SUPCO SPP6 Relay/Capacitor Hard Start Kit with 500% Increase Starting Torque - VEXUNGA 45/5 uF 45+5 MFD 370V or 440V Dual Run Start Round A/C Capacitor 45 5 uF 370 440 Volt VAC CBB65B Air Conditioner Capacitors for AC Unit Fan Motor Start or Heat Pump or Condenser Straight Cool - TITAN PRO, 1 Count (Pack of 1), No Color Packard TRCFD455 45+5MFD 440/370V Round Run Capacitor Replaces PRCFD455 --- ## 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.co.th/products/292715902-supco-spp6-relay-capacitor-hard-start-kit-with-500-increase](https://www.desertcart.co.th/products/292715902-supco-spp6-relay-capacitor-hard-start-kit-with-500-increase) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-23*