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The 3-Series hard starts provide the service professional with an OEM option when the application calls for a hard start. Combining a potential relay and start capacitor the 3 series provides a TRUE 3 wire solution.


  • Mechanical Potential Relay
  • True 3-wire solution
  • NATE® Recognized (Course #1867-0002)
  • Voltage sensing
  • Instant re-start
  • 35 amp relay contacts
  • Includes EZ snap bracket for quick installation
  • 330 VAC start capacitor
  • UL® Recognized
  • WARNING: This product can expose you to chemicals including Cadmium and Cadmium compounds, which are known to the State of California to cause cancer and birth defects or other developmental harm. For more information, go to
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Capacitor size (µF): 88 to 108 MFD
Recommended Range (hp): 1 - 3 hp
Operating Voltage VAC: 208 to 277 VAC
Hard starting compressors
Low voltage situations
Use on any single phase air-conditioner or refrigeration unit
SDS Product Sheets Cross Reference Information
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Manuals Application Sheets Software
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Replacement Part:CSRU1
Part Description:Hard Start
Manufacturer :5-2-1®

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