Choosing the right HVAC refrigeration compressor part is really a question of scope. Some repairs need a complete compressor, some need a starting assist, and some only need a wiring plug to finish the job. The four listed products range from a small connector to a full compressor, so the decision starts with whether the part is a compressor, a hard start device, or just a connector.
Quick take
The wiring harness is the lowest-priced entry. The two hard start kits follow at USD 28.99 and USD 34.67: the 5-2-1 Compressor Saver CSRU2 uses a color-coded hookup, and the Rectorseal Kickstart is a 2-wire relay/capacitor device. The Embraco NT6220Z is the only full compressor in the set, listed at USD 425.00 with a start/run kit.
Listed price comparison
| Product | Listed price | Price bar |
|---|---|---|
| HVAC Compressor Wiring Harness Plug 100213-03 SA8958 3-Pin SCR AC Connector | USD 20.00 | |
| 5-2-1 COMPRESSOR SAVER CSRU2 Hard Start Kit 3.5-4-5 tons AC HVAC CONDENSER UNITS | USD 28.99 | |
| Rectorseal Kickstart Compressor HVAC Hard Start Device KS1 | USD 34.67 | |
| EMBRACO NT6220Z R134A 3/4 HP Hermetic Compressor + Start/Run Kit Has Scratches | USD 425.00 |
Decision matrix
| Use case | Product to consider |
|---|---|
| Lowest-priced 3-pin harness replacement | HVAC Compressor Wiring Harness Plug 100213-03 SA8958 3-Pin SCR AC Connector |
| Hard start kit with a color-coded hookup | 5-2-1 COMPRESSOR SAVER CSRU2 Hard Start Kit 3.5-4-5 tons AC HVAC CONDENSER UNITS |
| Compact 2-wire hard start device | Rectorseal Kickstart Compressor HVAC Hard Start Device KS1 |
| Complete R-134a hermetic compressor | EMBRACO NT6220Z R134A 3/4 HP Hermetic Compressor + Start/Run Kit Has Scratches |
Product notes
5-2-1 COMPRESSOR SAVER CSRU2 Hard Start Kit 3.5-4-5 tons AC HVAC CONDENSER UNITS
The CSRU2 is listed for 3.5, 4, and 5 ton AC condenser units. It includes one hard start capacitor, a cable tie, two mounting screws, and a color-coded 5-2-1 hookup path: black to common, striped to start, red to run. The listing also specifies 240 V with corded electric power, and it notes CSRU1 compatibility. That makes it a strong pick when you want a guided hookup for a 240 V condenser. The main limitation is the voltage: it is a 240 V kit, so it is aimed at that supply rather than at a lower-voltage circuit.
Rectorseal Kickstart Compressor HVAC Hard Start Device KS1
The Kickstart KS1 is a 2-wire potential relay and start capacitor described as a maximum torque device for 3.5 to 5 ton units. It is the higher-priced of the two hard start kits, and its wiring is simpler than the color-coded setup. It is described as OEM tested and approved and designed to help compressors start under low voltage or high head pressures. If you prefer a compact 2-wire part, this is the one to look at. Its limitation is the price: it costs more than the CSRU2 while serving the same tonnage range.
HVAC Compressor Wiring Harness Plug 100213-03 SA8958 3-Pin SCR AC Connector
At its listed price, this molded 3-pin harness is the lowest-priced product in the group. It has pre-stripped and terminal-ended black, red, and yellow wires, and it is sold as a replacement part for air conditioning units, heat pumps, and commercial refrigeration compressors. The model is 100213-03 and the part number is SA8958. This is a harness only, not a hard start kit or a compressor. The use case is narrow: replacing a 3-pin SCR compressor wiring plug rather than addressing startup torque.
EMBRACO NT6220Z R134A 3/4 HP Hermetic Compressor + Start/Run Kit Has Scratches
This Embraco unit is the only complete compressor in the set. It is a 3/4 HP hermetic compressor for R-134a, listed at 115 V, and it comes with a start/run kit and installation parts. The kit pieces are described as having scuffs and scratches even though the item is new. That makes condition a real trade-off at the top of the price range. The 115 V rating also sets it apart from the 240 V hard start kit. If the project needs a full hermetic compressor rather than a helper device, this is the one to evaluate, with the cosmetic wear factored into the decision.
Final recommendation by use case
- For a harness-only repair, the HVAC Compressor Wiring Harness Plug 100213-03 SA8958 3-Pin SCR AC Connector is the lowest-priced choice.
- For a color-coded hard start kit on a 240 V condenser, the Compressor Saver CSRU2 is the direct match.
- For a 2-wire hard start device, the Rectorseal Kickstart KS1 is the compact alternative.
- For a full R-134a hermetic compressor, the EMBRACO NT6220Z with start/run kit is the complete unit, and its higher price reflects that scope.
