---
product_id: 30700327
title: "Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size"
brand: "supco"
price: "฿6260"
currency: THB
in_stock: true
reviews_count: 8
url: https://www.desertcart.co.th/products/30700327-supco-spp8e-e-series-electronic-potential-relay-style-hard-start
store_origin: TH
region: Thailand
---

# Electronic relay Two-wire install UL safety certified Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size

**Brand:** supco
**Price:** ฿6260
**Availability:** ✅ In Stock

## Summary

> ⚙️ Start Strong, Stay Smart!

## Quick Answers

- **What is this?** Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size by supco
- **How much does it cost?** ฿6260 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/30700327-supco-spp8e-e-series-electronic-potential-relay-style-hard-start)

## 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

- • **Smart Protection:** Back-up electronic timing circuit safeguards your compressor from potential damage.
- • **Certified Quality:** UL recognized and NATE certified, ensuring top-tier safety and efficiency in HVAC applications.
- • **Seamless Installation:** Two-wire connection simplifies setup, making it a breeze for HVAC professionals.
- • **Power Up Your Performance:** Designed for motors greater than 1 HP, ensuring robust starting power.
- • **Voltage-Sensing Innovation:** Advanced voltage-sensing capability for optimal performance and reliability.

## Overview

The SupcoSPP8E E Series Electronic Potential Relay Hard Start Kit is engineered for motors exceeding 1 horsepower, featuring a two-wire connection for easy installation. It includes a back-up electronic timing circuit for compressor protection, voltage-sensing capabilities, and is UL recognized for safety and NATE certified for HVAC applications.

## Description

Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size

## Features

- Electronic potential relay for starting motors
- Two-wire connection for installation
- Back-up electronic timing circuit to protect the compressor
- Voltage-sensing capability
- UL recognized for safety and NATE certified for HVAC applications

## Product Details

- **Connector Type:** Screw
- **Contact Material:** Silver Cadmium Oxide
- **Contact Type:** Normally Open
- **Mounting Type:** Panel Mount
- **Brand:** Sealed Unit Parts Co., Inc.

## Images

![Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size - Image 1](https://m.media-amazon.com/images/I/814y4Zo9Y0L.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by S***0 on May 29, 2025*

Works well

### ⭐⭐⭐⭐⭐ This thing works!
*by N***E on July 8, 2012*

In Maryland, we've been having an increasing number of blackouts due to bad weather. We already had a small 3500/4400w (continuous/peak) generator hooked into a 10 circuit transfer switch. When we installed that system, we decided not to consider powering the central air conditioner.Then a major heat wave combined with a REALLY bad weather, resulted in 100+ degree weather, half the state being blacked out for up to a week, and our decision to upgrade the generator to power the whole house hvac system.We're running a single phase (~240v) Trane XE1200 with a rating of 12 RLA and 65 LRA. Not realizing the importance of the AC unit's LRA value. We bought the biggest generator we could find sitting on a shelf at Lowes, a Generac Xg8000e 8000/10000w unit. Upgraded the generator side electrical wiring in the house from 10 gauge to 6 gauge. Fed the new wiring into a dedicated sub panel and piggy backed our orignal transfer switch panel off of the new subpanel. We put in a 20 amp dual pole circuit breaker into the new sub panel and feed that into a 30 amp, center-off Leviton 1288 a/off/b dual pole switch, to cleanly switch the ac between line power and generator power, the furnace blower motor was already wired into the original transfer switch panel.So, after upgrading the generator, supply wiring and power distribution... The ac wouldn't turn over. That's when we realized 65x240= 15600, we were at least 5600 watts short of the power needed to start up the AC, 12x240 = 2880 but we had more than enough power to sustain it, once it was started. We were prepared to exchange our Generac for the larger Gp175000e (17,500/26250w) unit...Then we read about Hard Start kits and their ability to deliver serious, yet brief jolts of current to an ac unit for easier startup. We ordered a Supco Ssp8e Electronic Potential Relay hard start kit. When I opened up the ac there seemed to be a hard start cap 5-2-1 style already there. Installed the supco in parallel with the existing start cap, across the herm and common connection of the main dual purpose cap.... No luck, still wouldn't start up under generator power.Then, I removed the old starter cap and just left the supco unit installed, across the herm and common connectors of the dual purpose cap and... Bingo(!)Ac started up and has been running properly all day. On a day when it's 105 degrees out side, we're at 76 degrees inside the house, under generator power. The temp did climb to 79 degrees while I did the hard start kit install but dropped back down within an hour or two.

### ⭐⭐⭐⭐⭐ Works great with EU2000I on a 2010 travel trailer
*by M***E on July 17, 2014*

Works great with EU2000I on a 2010 travel trailer. Before I installed the capacitor, when the AC kicked on the compressor, the generator would overload. It didn't matter if I had it on econ mode or not. When I went to install it, after removing the electric box cover, I discovered that there was only one capacitor in there. It had leads each with 4 prongs on it, so it was an easy plug and play. Watched a youtube video of someone installing on an old AC unit, and it had the same 3, and he instructed that it be installed on the red and white leads (the third is labeled fan), so I did just that (without knowing which of the two should be red or white). Before touching the leads, I shorted out the red and white leads that I was going to touch, and also made sure the power was disconnected, and there was no spark at all, but maybe it did something. And then I turned on the generator on econ mode and let it run for a few minutes and then turned on the AC. The generator groaned a little and then revved up to a higher level, but the AC ran successfully without overloading. Then I let it run for a few minutes and then shut it off and after another few minutes, turned on the AC and it did fine again. Haven't taken it out camping yet, but this will be this friday, so we shall see. If successful, this far beats spending another 1K on either a companion generator or having the 3000I model, both options which would use up more fuel. If I don't update this, consider the trip a success.

## Frequently Bought Together

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-21*