How many micro-farads? what's the capacitance? Does it have a relay inside or do i need to buy one?

There is no mictofarad listing and there is no relay nor is one needed. You connect this in parallel with the run capacitor for an extra kick. This SPP5 can be installed on all Air conditioners between 4000 and 120,000 BTU. 90v-277v. I know that it is strange not having the capacitance listed. My air-conditioning unit documentation said it was compatible with SPP5 Which I thought was strange as well. Why would the air-conditioner company indicated that you might need a booster? I don’t know. Maybe it is very common. But it works fine.

Is this compatible with lennox el16xc1-036 a/c 3 ton single phase

No, this is NOT Heavy Duty enough to a 3 ton 1 phase. U need a 'bigger' Cap, but I am not sure how big. Need some electricians advice here...

does this connect to compressor or motor start capacitor? How to tell which is which?

It connects to the start capacitor.

Using supco's univ. 3 in 1 electronic relay for 1/3,1/4 and 1/2 hp compressors. can't find anything for 3/4 hp. would this work and how would connect?

This unit is not heavy duty enough for larger than 1/2 hp. It wont handle the amps for larger motors. I have no idea regarding solutions for larger systems. Grainger.com carries heavier duty equipt., I'd call them.

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Supco SPP5 Capacitor

Product ID: 274341910

Details

Color
white
Brand
Supco
Voltage
277 Volts
Material
Plastic
UPC
687152197354

⚡277V high-voltage rating

📏Compact 3.81x6.35x8.89 cm size

⚖️Lightweight 132g design

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€ 49.48

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Description

⚡ Power up your system with Supco’s trusted capacitor – don’t get left behind!

HIGH VOLTAGE ENDURANCE - Operates confidently at 277 volts for demanding electrical systems.
LIGHTWEIGHT EFFICIENCY - At just 132 grams, it’s easy to handle and install with minimal effort.
SPACE SAVVY COMPACTNESS - Small footprint fits effortlessly into tight installations without compromise.
TRUSTED BRAND ASSURANCE - Supco’s legacy means you’re investing in proven performance and peace of mind.
RELIABLE GENUINE REPLACEMENT - Authentic Supco quality ensures seamless compatibility and durability.

The Supco SPP5 Capacitor is a genuine, high-quality replacement component designed for reliable performance in electrical systems requiring 277 volts. Its compact dimensions and lightweight build make it ideal for professional-grade installations, backed by Supco’s trusted manufacturing standards.

Specifications

Manufacturer	Supco
Part Number	SPP5
Product Dimensions	3.81 x 6.35 x 8.89 cm; 132 g
Item model number	SPP5
Voltage	277 Volts
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	132 g

Reviews

L**T

Perfect! It is working perfectly.

Worked perfectly. My AC compressor did not run. After testing, the compressor is still OK, but cannot run by itself. Bought this SPP5 Hard Start kit, hoping it would help to start the compressor. Yes, it started the compressor perfectly. Now, my AC aging compressor runs well for a week without any problem so far. Recommend to use it on aging compressor.

18.06.2025

D**N

Does the job!

This seems to work really well! I just happened to install it in my unit when my compressor was on it's last leg...but when I did first hook it up, my compressor did start up when the thermostat called for it. Before, it was starting whenever it wanted to. Luckily, it wasn't super hot and I had a portable A/C unit we used until a HVAC friend of mine got me my new one. All in all, this seems to work like it says it will.

25.08.2023

D**Y

Four Stars

what I wanted ?

26.01.2015

T**M

It fixed it. 35 year old heat pump is still going!

Respected company and it couldn’t have been simpler to install. The compressor was stuck and just buzzing but started right up after. Just make sure to watch a lot of videos on doing it so you don’t get electrocuted or shocked by the capacitor. It’s easy, but no joke.

25.12.2025

A**R

Perfect fit

It worked perfectly. It resolved my issues.

28.10.2023

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