Hard Start Kit, Relay and Start Capacitor, Voltage 90-277, 1/2 to 10 HP, Application For Use on Residential and Commercial Air Conditioning Units, Heat Pumps and Room Air Conditioners, Provide Additional Starting Torque to all Single Phase 115 thru 288 Volt Units, For Use With PSC and CSIR Compressors, Includes Lead Wires, Electronic Potential Relay (EPR), 330 V Capacitor RestrictionsCalifornia Proposition 65 Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Refrigeration and Air Conditioner Start Assist Kits4E239, 4E240, 4E241 are for residential and commercial air conditioning units, heat pumps, and room air conditioners. Provide additional starting torque to all 1-phase, 115 to 288V units. 4MG78 replaces 3-wire potential relay and capacitor. 4E238 is used with residential and commercial refrigerators and freezers.