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  • Supco SPP E Series Electronic Potential Relay Style Hard Start Kit
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by Supco

Supco SPP E Series Electronic Potential Relay Style Hard Start Kit

Available in multiple versions

66 customer reviews

Price: $19.98 - $37.64
Product Specifications
Brand Name Supco
Specification Met UL
UNSPSC Code 39122300

This Supco SPP E series electronic potential relay style hard start kit has... Read full product description


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1 - 4 Horsepower Range, 130-156F Capacitor Size B004XS1OHS
In Stock (5)
$28.22
1/2 - 3 Horsepower Range, 88-106F Capacitor Size B002JP3MEK
In Stock (72)
$22.50
Greater than 1 Horsepower Range, 189-227F Capacitor Size B0002YTKXW
In Stock (22)
$24.78
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Product 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

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0071OXD8E
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (66 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

12 of 13 people found the following review helpful By Neigel G Creese on July 7, 2012
Size: Greater than 1 Horsepower Range, 189-227F Capacitor Size Verified Purchase
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...
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7 of 7 people found the following review helpful By flutterby42 on July 10, 2013
Size: Greater than 1 Horsepower Range, 189-227F Capacitor Size
Our Houston home primary AC went out in 103 degree heat wave. I was so worried and called a large AC repair company. The technician spent about 30 seconds diagnosing the problem as a bad start capacitor. He suggest a replacement as well as the additions of a "hard start kit". Cost? $600. Yeah, hold on a sec. I googled AC start capacitor on my phone, and saw them for $20-ish. And hard start kits, or the Supco SPP8E for about $35. I asked why we couldn't just grab the capacitor off the smaller upstairs unit that was sitting inches away. He got real defensive: started explaining how the company had overhead, blah, blah. I sent him packing and made the temporary swap to keep us going. Jump to the end: Installed this dandy in about 2 minutes with a nut driver and my 3 year old handing my the part. AC starts noticeably smoother. Now, does that keep me going for years, or is it just a short-term solution to an obviously worn AC compressor motor? For $35 I'll take that bet.
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9 of 10 people found the following review helpful By Delbert Brown on May 16, 2012
Size: 1/2 - 3 Horsepower Range, 88-106F Capacitor Size Verified Purchase
This little unit worked super well on my RV air conditioner. I was having trouble running my AC on a 3000 generator if the generator was set in economy mode; it would send the generator into overload. Everything work great now doesn't even dim lights anymore when the AC comes on, it now will start on a 15 amp household breaker without any problems. Very satisfied
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8 of 9 people found the following review helpful By J. Abshire on December 4, 2011
Size: 1/2 - 3 Horsepower Range, 88-106F Capacitor Size Verified Purchase
The SUPCO SPP6E Relay and Hard Start Capacitor work really well. My generator wouldent power the AC on my trailer so I installed the Hard Start Capacitor and it works like a champ.
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4 of 4 people found the following review helpful By Amazon Customer on October 11, 2012
Size: 1/2 - 3 Horsepower Range, 88-106F Capacitor Size Verified Purchase
An ac service person charged me over $200 for 15 minutes of work to replace a blown capacitor with this when my compressor would not start. Next Time, I'll do it my sself for around $20. Read the instructions or look for installation videos before use. Warning: You could get a shock, if you do not.
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4 of 4 people found the following review helpful By Liberty on July 22, 2012
Size: Greater than 1 Horsepower Range, 189-227F Capacitor Size Verified Purchase
Lowered my start up amps from 90 to 50 on a 5 ton a/c. Purchased two but one was defective. Amazon mailed a replacemet immediately. Works great
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3 of 3 people found the following review helpful By Shadow on October 19, 2012
Size: Greater than 1 Horsepower Range, 189-227F Capacitor Size Verified Purchase
Installation is easy used this to repair a 2yr old 12000BTU 110v window unit it's designed more for 220v central air units but with some work I fit it into to case of my window unit seems to take about 30sec to charge up on the 110v then it's turns over even the stiffest compressors great money saver vs buying a new a/c and worth the try if for the $20-$30 to save a unit vs buying a new a/c at $300+ I would generally recommend it for the larger window units Supco's website has a listing with the hp size of your compressor and recommended model to use
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2 of 2 people found the following review helpful By Mr. Picky on July 6, 2013
Size: 1/2 - 3 Horsepower Range, 88-106F Capacitor Size Verified Purchase
I installed this on the compressor for a central AC for which I have a 10KW stationary BU generator. The lights used to dim in the house when the compressor would kick on at the same time as the fans for the condenser and the air circulation. With this in place, one moment it's off; the next moment everything is on. I also checked out the start with the BU generator running and it seems to be fine.
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